I note that they didn't actually list the reasons for a bov/bypass valve... It has nothing to do with dyno pulls. Use on a diesel would be pointless, as there is no valve to stop/restrict the airflow going into the intake ports of the motor, so there is no pressure wave to damage the turbo, or pop off the intake hoses. (Unless you are doing some ridiculous high speed load, and stopping the motor dead-in which case it won't last long anyway....) The bov/bypass valve was engineered to: 1. Prevent pressure spikes from bending/folding the throttle plate. 2. Prevent pressure spikes from back feeding the turbo compressor, acting as a brake, possibly bending fins, breaking the shaft between the turbine and compressor wheels... 3. Slow the boost pressure drop (pre-throttle), so that you have the turbo still spun up as you shift the gears in hard acceleration. A BOV vents to atmosphere, this creates a momentary rich condition (you can get flames out the tip of the exhaust depending on setup), and requires almost no plumbing. As stated, this can also trigger computer diagnostics, and safety measures, depending on the complexity of the engine computer. This momentary rich condition can mimic that which you get with a carburetor. A Bypass valve, vents to the intake track pre boost device (turbo/supercharger/blower), but post air measurement (if so equipped). This allows the computer to have a better idea of how much air is in the system. And can allow a little (very minor) help in spinning a turbo. Also being that the air escape is part of the closed system, if there is a failure, and it sticks open, or the valve sealing fails, you don't have to worry about dirt and debris entering the intake system, or so much that unmetered air is entering exiting the system. Who should consider them? Those with motors than run boost and have throttle plates. What does it do? Decrease turbo lag, protect against damage from pressure spikes in boost motors with throttle plates. This comment requires no replies. It was likely stated earlier, but frankly I'm not wading through over three thousand comments, given the vitreal and spite I see in the first part of the comment list. This comment is not done in spite, but in education, for those that were hoping for facts.
Totally Legit Gaming [TLEG] it doesnt damage it, only wears it down a little faster, but its so little that it doesnt matter though a turbo surge, that would damage the turbo
***** That,s cool, as I could use the spoiler as a work bench to hold my hoof care gear :) . Extra donkey power, and a mobile work bench on the farm, what could be finer?
That's what I was going to say. And actually, depending on your turbo setup, the type of BOV that you're using will actually make a difference. A recirculating blow off valve will help with surge between shifts but also allow you to keep your boost pressure up higher since it puts it back into the system. This surge that occurs when a BOV is not in place can cause a fuel enrichment issue and cause your vehicle to stall, but this is not always the case as it depends on the size of the turbo.
+George Mahfood Absolutely agree! But if I understood it right, the sound is caused by air returning through intake. Now isn't it a bad thing for a turbo lifespan?
+George Mahfood Depends, if you have a high boost turbo, you might wear out the bearing but you need high boost. It's just air passing by, slowing down the compressor, so you will have a bit more lag when you shift and the response won't be so good. It's not bad for the turbo, it's worse when you have high boost and all that air can't flow throught the system and preasure builds up until something breaks.
+Cristian Ceclan There is no noticeable in lag between running a BoV and not, also there are a lot of people running 40+psi with no BoV's and never having issues, it's very common in Australia for people not to run them.
I also have 3 intakes. One is cold air, the other warm air and then the ram air. I couldn't find any goat air intakes so the ram air will have to do for now.
why the dyno with the blow-off valves? the guy just said they only matter when you let OFF the throttle. he said the valves are only ment to maintain spinup between shifts
Because most factory BOVs are designed to leak at a certain pressure, they don't actually leak as such, they open at a preset pressure which is usually just above the factory boost spec. Not only that but factory valves are easily modified so that they hold boost and therefore you don't need to replace with an aftermarket valve..........but that's bad for business.
1magnit basically functioning the same as the valve (can't remember name) in diesels which you hear blowing off once it it toward the end of the gear? Cool thanks,
I found this channel from their brz build. Bought a GLI a few days ago, was considering switching to a BOV, and stumbled upon this gem. It's amazing how much some things have changed and how some are exactly the same.
recircing the BOV is very important if you are running a MAF before the turbo instead of a MAP in the manifold because if you release the air to atmosphere when running a MAF, then you are completely ruining your A/F ratio as you just vented air that the engine is expecting and dumping fuel for. Can have a big effect on 1/4 mile times as your A/F gets messed up for a second at each shift. can make for a nice flame thrower exhaust, though.
***** It is that bad. Especially on vag engines. To a point even, when they start boging and surgeing on gear change. Usually the diverter is set to open at certain level of boost - so should the BOV be - but many set it to too easy and that causes additional problems.
XxAtomic646xX well many aftermarket ecu's allow you to eliminate the maf and run a map sensor instead. (AEM being one that I've seen it done with), but that is an interesting idea that I hadn't heard of.
I just traded my 2011 Ford Taurus SHO for a 2015 with 10 * more bells and whistles. I was looking at getting a new one since they are discontinued which happened in the past but then they were brought back. Jesus with a credit score of around 780 I was looking at just over $700 a month. I make $29.96 an hour so the money is pretty good but no way could I make a $700 a month car payment LOL. I just really love the sho's it's a fast car but does not raise your insurance. I really wanted to swap out the factory valves with vent to atmosphere unfortunately that would really lower the performance. I wish I could find the ones I was looking at as they recirculated but managed to vent to atmosphere without impacting performance. Great video as usual!
Blow off valves aren't intended to make power. What they do is release the pressure on the turbocharger when the throttle plate is closed, making the bearings and other internal components last longer.
Recirc valves are very important on some cars, specifically ones that use the MAF to determine how much air is in the intake system and adjust fueling proportionally. If the blow off valve lets the air out, but the fuel still gets dumped in, you can run extremely rich, which will then cause the short term fuel trim to lean out. Then you get back on the throttle, run lean, blow your motor, and blame it on the tune.
I can't believe all the people who want the turbo flutter sound. To me, it's right up there with knocking rods, piston slap, and maladjusted valve lash. It's the sound of failing parts.
+Tony Tuite But it's not parts failing, if it does cause any damage then it's so small you wouldn't even notice it over the life span on the turbo, plenty of people not running a bov for years without issue.
Sorry, but you're wrong. Take my Holset HX35 for example. It has an 83mm diameter exducer. Converted to inches, that's a diameter of around 3.25", or 1.625" radius. Take Pi*1.625^2=~8.29 inch surface area. I am running 21 psi of boost. Now take 21*8.29=174 pounds of thrust load slamming into your compressor wheel every time you shift. That will quickly add up to permanent damage to your thrust washers and bearings, not to mention your compressor wheel over time. Add in the effect of this Shockwave exerting reverse force on the turbo, and that is a lot of damage fast. You may get away longer on a small turbo, but if your making real power you need a BOV.
Tony Tuite Your numbers don't mean shit, in the real world it really doesn't matter, not to mention they are designed to take that kind of load. " You may get away longer on a small turbo, but if your making real power you need a BOV." In Australia and Japan it is very common for people not to run BoV's (especially in the VL turbo and drifting scenes), including people making well over 1000hp without issue.
Tony Tuite You know what makes me right? the countless people who don't run BoV's and haven't for many years without issue, your math doesn't mean anything, your wrong about the amount of load it would be hitting the compressor, it's not as simple as the size of the surface area times the boost and all the load wouldn't just be hitting the compressor. so yea I will do what a want and for some reason I think my turbo will be just fine like it has been for the last 5 years.
The reason I have a recirculating BOV on my Subaru is to help maintain boost between shifts, because of my larger aftermarket turbo. I think atmospheric BOVs are stupid and solely for an annoying high pitched purge sound. Obviously it's to blow off the massive surge pressure from the turbo, but be smart and use that surge pressure to hold boost with a recirculating bov
Yes exactly, this is a crappy video, the whole statement is misleading about venting atmospherically versus diverting, because the power will be the same but what you gain by having a diverter valve is quicker throttle response because you're not losing that boost charge and needing to respool that boost charge from scratch so to speak. So the test should not be total power output but rather throttle response right after a gear shift (when you step off the gas in the course of a shift)
blow off valves arent going to give you more power if anything theyre just going to improve your shift quality and/or protect your manifold from high pressure
*****, that's pretty weird that you have "triple valve springs" in a car with no valves! The RX-7 has a 13B Wankel Rotary engine, so I was just wondering where you managed to install your valve springs at!
105kw =140bhp. The 1.8 turbo (im guessing engine code AGU judging by the cable throttle) sould be running 150 bhp even without a tune. Something isn't quite right there
You don't measure *bhp* on a dyno like that. You measure *_whp_*, which is after probably a _15% loss_ due to transmission. You can either adjust the bhp measure for drivetrain loss or add 15% to the whp number the dyno read out. If you do that, the numbers seem consistent (about a 11 bhp gain).
The blow off valve has two purposes. The primary purpose is to prevent turbo surging where high pressure air is forced backward up through the inter-coolers and back through the turbo. This surge can damage the turbo bearings; both shaft bearings and end bearings. The second purpose is to prevent over-pressures that can damage boost feed pipes and inter-coolers.
Pay more for insurance? I pay less for my 2015 WRX than I did with my Ram 2500 HEMI or even my 2013 Tacoma. I believe i was about $20 less than the Ram but only $6 less than the Tacoma.
With full coverage, $500 deductibles, going from a 2014 Mirage (i3, 1.2L, 74hp, 0-60 in 12 seconds) to a 2014 evo (i4, 2.0L w/turbo, 290hp, 0-60 in 4.5 seconds)... insurance went up almost $40, from $105 to $141. My 2011 Camaro was $130. It's more, but fairly insignificant when you consider the cost of the cars (Mirage 13k, Camaro 27k, Evo 40k).
Ancyker damn that sucks. My ram was a $60k truck so that could be why it cost so much. However i still pay less than i did with the Tacoma, which i find odd. Too many variables are taken into account with insurance. Its retarded.
Faster doenst always mean more power on a dyno. If your bov is dumping too much air between shifts you would effectively be killing the efficiency of your spool. Re-circulation aims not to do that by dumping vented air back into the intake system. How much faster.. its hard to say but i would be willing to bet that a recirc car with identical driver conditions will perform better than a poorly selected all for noise vent to atmosphere set up.
local tourist yea there is no one size fits all you’ll need to dial springs weights and settings for your set up but you could be right in some setups it could vary I was speaking more overall
@local tourist I think Diesel turbo systems operate differently. Honestly, I dont have any experience there but my guess is they are different in some degree. Tinkering is key finding that sweet spot
+Aramis D'Nivra so much laws and rules to cripple car enthusiasts from doing most modifications, if you have turbo car. ooohh jesus 3 out of 5 police cars will stop you for no reason hoping to find slightly wrong fitments just to defect your car. also every price for service and related things becomes expensive 😞.
+Ryizer kovich oh bummer :( i was hoping australia would be an awesome place for car enthusiasts. Can you service your own car over there or is it illegal?
+Aramis D'Nivra some states had a little easier rules and laws but I think you can service you car yourself but someone has to write the papers for you to validate that the car is road worthy .. But im only talking about Sydney nsw not sure about other states
I wish they would set up mandatory car classes in schools, so every single person who drives a car would have a basic understanding of them. It would make it a lot less painful to talk to people about the subject.
David Serrano Dude. Either they should know something about what they're talking about, or they should ask questions and not make statements as if they know something. It would be the same as if I went and searched out knitting videos on youtube and then I suddenly decided that I am some kind of knitting expert and started making comments. All the old ladies would get tired of that shit in a hurry and they'd tear my head off. Who could blame them? lol Humans..
the best way to learn is by making mistakes simple as that. sure questions are fine too, but they would only ask a question if they knew they were wrong. so if you don't have the patience to talk to someone who is learning then you would be the one with the problem. Americans...
Nice explanation and good explanation on why its good to NOT let all the pressure out and not starting from empty ,,Lads need to know its NOT all about noise when it comes to performance : )
R Weber I am getting a 2013 Scion FRS and Putting a Greddy BOV on it...aw shucks does that mean I am a poser?...ah well who gives a shit my car sounds awesome! Fuck you bruh! =D
You don't lose performance with a BOV, but you do increase your lag between shifts, as compared to a BPV which recirculates the air back into the intake tract and helps keep the turbo spooled.
Woke up this morning wondering if my BOV would still work installed on my air intake, essentially releasing the intake pressure when you let off haha, video confirmed it can be done!
That was stupid. You will not gain or lose power with a bov. A recirculator will simply allow the turbo to spool faster after a shift because that air is rerouted to before the turbo rather than venting to atmosphere. And the reason you run rich after putting a bov on is because on a system that uses a maf sensor the ecu is injecting fuel for the air you just let out into the atmosphere. You will only run rich for a split second after getting back on the throttle. The only way to get around that is to delete your maf sensor and only base idc's off of a map sensor.
Actually on a VW using a BOV will lose power. They use diverter valves instead. The BOV loses pressure dropping boost after a gear change AKA when it opens up
Obviously you didnt understand what I said. You will NOT lose power. Your engine will make the same amount of power with a bov, bpv, or no valve at all. Bov's have no affect whatsoever on power. You will lose spool time after lifting off the throttle then getting on it again.
Whether you should vent or recirculate depends on the design of the intake. If the incoming air is measured by the airflow sensor BEFORE it goes through the turbo (like if the airflow sensor is in the air filter box), then you must use a recirculator valve, or else the ECU will be momentarily confused by air that was measured by the airflow sensor but never delivered into the engine, and that will throw off the fuel:air ratio and change the long-term fuel trim in the ECU. You can't just pick and choose which version you want to run, unless you feel like redesigning the entire intake.
Recirculated BOVs don't add power, therefore not making your car faster... Just like how lowering your car doesn't add power. Come on, there's more to speed than just power. Recirculation holds the boost, keeping the compressor ready for the next shift.
blow off valves don't increase power they release boost when off the throttle letting the turbine free spin and not let boost push the turbine backwards
My lawn mower is turboed and Im running over 9,000 lbs of boost because my grass is really sturdy. I just let mine "stutututut" instead of a "stooooosh" tho
+Bainanaz Even a factory turbo running stock boost will make the sound, of course more boost or a bigger turbo will be louder, also metal air intake into the turbo makes it louder to.
DriftNick I know I sound stupid and weird... Is it possible to get the psst shututu sound in a non turbo car..? ( and yeah it's a bit low powered car I meant it's 1.2 - 1.5L petrol engine.
Great video. I expect the Golf is going to be throwing fault codes though with an atmospheric dump valve. The ECU expects the air to be returned to the inlet like the stanrdard re-circ.
from 2:30 to 3:10 is the only useful info in this video... the usefulness of a recirc valve or BOV is only seen in actual driving conditions and has no effect on peak power... putting the car on a dyno was pointless.
The dyno also showed what happens to factory turbo cars running high boost tunes - they cant hold the additional pressure and leak boost robbing you of power --- thus a NEW blow off valve would actually give you more power while also adding to the sound of the car ---- hi boost tunes on those GTIs crank it up to 20-22psi from a factory peak of like 12 or so
Both if done as a package are a valid enhancement....BOV on a naturally aspirated engine would be the same as stuffing yer wifes bra to make ya think she was 34DD..
Oh, and ***** - if you're going to lie, at least don't be an idiot. A 13B is a rotary motor - it has no camshaft and no valves. What the hell would "triple valve springs" be, anyway?
Marlon Lyn your turbo insatll didnt go as planned? im tryna decide weather to boost my civic or get a wet nos kit. what type of car did you boost what went wrong? 5k?
Michael Mack Honestly I was just joking, but if you're planning on boosting there are a couple of questions that have to be asked: 1. How old is the car? 2. Are there any pre-existing issues inside the car? 3. Do I have access to a Subject Matter Expert that's already done this? 4. Do I have access to do work on my car after it's been bosted? I boosted a 2002 GTI VR6. Still having issues and not %100, but I'm hoping to resolve all of them. the 5k comes from the price from all the stuff, plus hardware. Believe me, it adds up fast. Hit me up and we can talk more about it.
To everyone asking the same thing over and over, Turbo FLUTTER is bad. Thats basically a turbo surging and it will destroy it rather quick. You need a sort or relief for that boost thats built up when you let off the throttle to shift and that is a diverter or blow off. You want "tshhhhh" not "stuutututu". My audi actually had a boost leak because the stock diverter valve was stuck open.
Absolutely not. Turboing a 350 is very touchy, and even paying a shop tons of money to do it properly the engine WILL NOT handle boost very well. This is the failing of the VQ35 in the 350. Boost + VQ35 = not good. Doing it yourself also adds in the factor of you probably doing something wrong, then paying tons of money for dyno time to tune it. I you want more power swap your transmission, do exhaust and intake mods. Then forged internals and an ECU remap. DON'T TURBO OR SUPERCHARGE YOUR Z.
Fuck man why so the fkn negativity its just a comment... lets be realistic even though you love 350 z's most stock automatics will break unless modded. youc ould off just made your own comment and no need to insult people... are yo on your period or something? lol
luis luna He might be right but nissan has been boosting motors for a long time. FYI a boosted motor kicking out anything near 100% of it's factory hp (like if your motor came with 200 and you boost it to 400) will only last about a year regardless of how you build it. The only way to get the longevity in it is to start with a motor that is overengineered like theh 4g63 or even subarus 2.5 boxer. I say this. If you want to boost the engine and you want to keep it reliable go with a supercharger. The boost is predictable and easily tuned. Next don't go over 8lbs of boost. That's the industry standard. Every car on the market can handle that from the factory. Lastly if you want to REALLY get power I'd still go supercharged but add internals and supporting mods and boost in the area of 15psi. After that you'd be better off building a motor for turbo.
Honestly I didn't install the blow off valve that came with my turbo kit just so I could get the stututu while revving at the local car meets. Roses are red Violets are blue I have no blow off valve so my turbo goes stututu
bom dia sou do BRASIL procuro a muito tempo um barulho de carro turbo para meu carro meu carro nao e turbo gostei muito desta forma que vcs fes este carro nao e turbo nao ne ??? mas um escrito curti pra caramba esta para vlw. ..
+wartactics depends how old the engine is. over the life of an engine, parts wear and power will fail, My vectra 1.8, ok its a non turbo automatic, may have produced at a guess 110hp when it was new in 1998, its probably now down to around 80 so a 7 year old GTI producing 140, seems about right.
Even the Golf R was never a hardcore hot hatch... The Germans are yet to build a Hatch I deem good. The Volkswagens look gorgeous but on track they are heavy. They are "Sporty Comfort" cars.
![How To Turbo Your Car [IN ONE DAY!!]](http://i.ytimg.com/vi/E2Y-FXt7QAo/mqdefault.jpg)
![How To Turbo Your Car [IN ONE DAY!!]](/img/tr.png)
![[LIVE] BABYMONSTER(베이비몬스터) - DRIP | 두시탈출 컬투쇼](http://i.ytimg.com/vi/UG05pxLGwzc/mqdefault.jpg)
In the good old 480p days, MCM was putting out these kinds of videos. Oh how far they've come.
i miss the civic parody build.
and now, 2 years after your comment they made a car for, and played in a commercial.
They are still very good videos
5 yrs ago loll
@@TotalySidYT loool
I note that they didn't actually list the reasons for a bov/bypass valve...
It has nothing to do with dyno pulls.
Use on a diesel would be pointless, as there is no valve to stop/restrict the airflow going into the intake ports of the motor, so there is no pressure wave to damage the turbo, or pop off the intake hoses. (Unless you are doing some ridiculous high speed load, and stopping the motor dead-in which case it won't last long anyway....)
The bov/bypass valve was engineered to:
1. Prevent pressure spikes from bending/folding the throttle plate.
2. Prevent pressure spikes from back feeding the turbo compressor, acting as a brake, possibly bending fins, breaking the shaft between the turbine and compressor wheels...
3. Slow the boost pressure drop (pre-throttle), so that you have the turbo still spun up as you shift the gears in hard acceleration.
A BOV vents to atmosphere, this creates a momentary rich condition (you can get flames out the tip of the exhaust depending on setup), and requires almost no plumbing. As stated, this can also trigger computer diagnostics, and safety measures, depending on the complexity of the engine computer. This momentary rich condition can mimic that which you get with a carburetor.
A Bypass valve, vents to the intake track pre boost device (turbo/supercharger/blower), but post air measurement (if so equipped). This allows the computer to have a better idea of how much air is in the system. And can allow a little (very minor) help in spinning a turbo. Also being that the air escape is part of the closed system, if there is a failure, and it sticks open, or the valve sealing fails, you don't have to worry about dirt and debris entering the intake system, or so much that unmetered air is entering exiting the system.
Who should consider them?
Those with motors than run boost and have throttle plates.
What does it do?
Decrease turbo lag, protect against damage from pressure spikes in boost motors with throttle plates.
This comment requires no replies. It was likely stated earlier, but frankly I'm not wading through over three thousand comments, given the vitreal and spite I see in the first part of the comment list. This comment is not done in spite, but in education, for those that were hoping for facts.
ok
The real mvp
They quite clearly said what their point was...
Your comment is much appreciated
"This comment requires no replies." OK, oh whoops...
why would you not want that stutututut sound?
Sounds beautiful
i am Viking turbo damage?
Totally Legit Gaming [TLEG] it doesnt damage it, only wears it down a little faster, but its so little that it doesnt matter
though a turbo surge, that would damage the turbo
i am Viking turbo chatter = ruined turbines.
pcfxer chatter? do you mean flutter?
because then, No.
Flutter doesnt mean broken turbo, my car flutters and the turbo is fine
My horses have blow off valves, but I am perty sure none of them is fitted with a turbo ;) .
*****
It makes them go faster :) .
+CNCmachiningisfun Put on a few decals for even more powah!
*****
The extra heat might cause a tail hair fire, especially if I feed them on high octane hay.
Tony Tuite
My horses like to look their best, so those decals ought to do the trick.
Maybe I could add some go-faster strips too ;) .
*****
That,s cool, as I could use the spoiler as a work bench to hold my hoof care gear :) .
Extra donkey power, and a mobile work bench on the farm, what could be finer?
That's what I was going to say. And actually, depending on your turbo setup, the type of BOV that you're using will actually make a difference. A recirculating blow off valve will help with surge between shifts but also allow you to keep your boost pressure up higher since it puts it back into the system. This surge that occurs when a BOV is not in place can cause a fuel enrichment issue and cause your vehicle to stall, but this is not always the case as it depends on the size of the turbo.
...Love it...I'm going to put a BOV on my wife's vacuum cleaner..
Bob Villa not your vacuum?
@@ewanlockhart3943 no, his wife does all the cleaning
@@adnaanashraf3643 ik I was implying that
😂😂
7 years ago throwback for you ahahah
HAHA that was funny. When I saw them put the battery in the backpack I thought we were going to see a running man with a BOV. lol
Lolz me too haha
hahaha yeah that would have been funny!
Michael King 😭😭😭😭😭😭😂😂😂😂
Ok honestly the turbo flutter sound you get with no bov is one of the best automotive sounds out there let's be honest
+George Mahfood Absolutely agree! But if I understood it right, the sound is caused by air returning through intake. Now isn't it a bad thing for a turbo lifespan?
+pave64 I know it's really bad for a turbo over time but still the sound is amazing might not be worth the risk though
+George Mahfood Depends, if you have a high boost turbo, you might wear out the bearing but you need high boost. It's just air passing by, slowing down the compressor, so you will have a bit more lag when you shift and the response won't be so good. It's not bad for the turbo, it's worse when you have high boost and all that air can't flow throught the system and preasure builds up until something breaks.
+Cristian Ceclan There is no noticeable in lag between running a BoV and not, also there are a lot of people running 40+psi with no BoV's and never having issues, it's very common in Australia for people not to run them.
thank heavens - an actual human with brains who doesn't feature on Springer !
Damn, i'd barely have been old enough to know what a turbo is when this was released and now it's been recommended by youtube so that I can enjoy it
I have 5 BOVs on my non-turbo car. I picked up at least 100hp from each one. :-P
Dammmmmn dude good shit
I also have 3 intakes. One is cold air, the other warm air and then the ram air. I couldn't find any goat air intakes so the ram air will have to do for now.
+Marquise Lewis he was joking stupid...
call me Naz fucking obviously you dumbass you obviously didn't see that my comment was just as much of a joke as his, your the stupid one you dumbass
Marquise Lewis yours isn't obvious. There are people that would mean that shit these days so yeah calm the fuck down
why the dyno with the blow-off valves? the guy just said they only matter when you let OFF the throttle. he said the valves are only ment to maintain spinup between shifts
Busting a myth.
ah copy that
Because most factory BOVs are designed to leak at a certain pressure, they don't actually leak as such, they open at a preset pressure which is usually just above the factory boost spec. Not only that but factory valves are easily modified so that they hold boost and therefore you don't need to replace with an aftermarket valve..........but that's bad for business.
1magnit basically functioning the same as the valve (can't remember name) in diesels which you hear blowing off once it it toward the end of the gear? Cool thanks,
Darklord 4 yes?
I found this channel from their brz build. Bought a GLI a few days ago, was considering switching to a BOV, and stumbled upon this gem. It's amazing how much some things have changed and how some are exactly the same.
me on recommended:
youtube recommending me a 10 year old video:seems right
Wow, i didn't saw, that is too old :D
recircing the BOV is very important if you are running a MAF before the turbo instead of a MAP in the manifold because if you release the air to atmosphere when running a MAF, then you are completely ruining your A/F ratio as you just vented air that the engine is expecting and dumping fuel for. Can have a big effect on 1/4 mile times as your A/F gets messed up for a second at each shift. can make for a nice flame thrower exhaust, though.
Exactly, I can't believe that they didn't cover this
***** It is that bad. Especially on vag engines.
To a point even, when they start boging and surgeing on gear change.
Usually the diverter is set to open at certain level of boost - so should the BOV be - but many set it to too easy and that causes additional problems.
if you have a good tuner, they can rescale your maf and it will act just as if your maf equipped car was converted to speed density
XxAtomic646xX well many aftermarket ecu's allow you to eliminate the maf and run a map sensor instead. (AEM being one that I've seen it done with), but that is an interesting idea that I hadn't heard of.
Hallsy it's something we evo 8/9 guys do if we do want to go big turbo. Cause speed Density only shows gains on bigger than stock frame turbos
I just traded my 2011 Ford Taurus SHO for a 2015 with 10 * more bells and whistles. I was looking at getting a new one since they are discontinued which happened in the past but then they were brought back. Jesus with a credit score of around 780 I was looking at just over $700 a month. I make $29.96 an hour so the money is pretty good but no way could I make a $700 a month car payment LOL. I just really love the sho's it's a fast car but does not raise your insurance. I really wanted to swap out the factory valves with vent to atmosphere unfortunately that would really lower the performance. I wish I could find the ones I was looking at as they recirculated but managed to vent to atmosphere without impacting performance. Great video as usual!
These dudes should work for Top Gear
You mean to say , Top Gear should work for MCM ? :)
PBJPRODUCTIONSTUDIOS No he didn't, fuck off. Top Gear has always been better, even 21 seasons ago. Oh, did I mention 21 seasons? Yeah. I did.
MLGBongHits dude chill
tombax338 You chill, dude.
MLGBongHits ?
The reason I want a turbocharged car is FOR that 'stutututu' sound. Why would I want to get rid of it?
because it ruins your turbo and it decreases its life span.
Luis Ramirez But by how much? If it makes my turbo last for 3 years instead of 4, I'd still leave it without a blow off valve.
+Retz If you're breaking turbos every four years, you might be doing it wrong.
Ryan Thompson That was an example, I was asking how long that one lasts.
+Retz Ignore the people who say it will ruin your turbo, there really is no proof that it does any noticeable damage over its life span.
Still here and still enjoy the old skool videos like this 😄
Same
Perhaps the only MCM episode where they rice a car...
trd lazer and civic build
BoV isn't rice. a Fake BoV is rice
+Liam jones but is it Rice to put a Real bov on a non Turbo car/bike?
Any turbocharging system has a wastegate which relieves the excess pressure. Just because they don't sound cool doesn't mean they are not there.
I may be 8 years late...but this is an excellent and creative video. BOV on a bike?!! A+ for originality.
you guys had tears coming out my eyes of laughter when you modified the bicycle.lol I'm subscribing.good job.
Haha, oh man. I'm here from the most recent video of making the BRZ fast... and oh man have they come far 😂
I think it is impresive that mcm is the only channel that have not improved production quality since 2009
Blow off valves aren't intended to make power. What they do is release the pressure on the turbocharger when the throttle plate is closed, making the bearings and other internal components last longer.
You look like smashed pumpkin thats what he literally said in the video you fool
Jessa you one ugly as fuck dude
Aaron L rich coming from a person with no pic.
Everything sounds better with an Australian accent.
Should hear us in New Zealand
Recirc valves are very important on some cars, specifically ones that use the MAF to determine how much air is in the intake system and adjust fueling proportionally. If the blow off valve lets the air out, but the fuel still gets dumped in, you can run extremely rich, which will then cause the short term fuel trim to lean out. Then you get back on the throttle, run lean, blow your motor, and blame it on the tune.
I can't believe all the people who want the turbo flutter sound. To me, it's right up there with knocking rods, piston slap, and maladjusted valve lash. It's the sound of failing parts.
+Tony Tuite But it's not parts failing, if it does cause any damage then it's so small you wouldn't even notice it over the life span on the turbo, plenty of people not running a bov for years without issue.
Sorry, but you're wrong. Take my Holset HX35 for example. It has an 83mm diameter exducer. Converted to inches, that's a diameter of around 3.25", or 1.625" radius. Take Pi*1.625^2=~8.29 inch surface area. I am running 21 psi of boost. Now take 21*8.29=174 pounds of thrust load slamming into your compressor wheel every time you shift. That will quickly add up to permanent damage to your thrust washers and bearings, not to mention your compressor wheel over time. Add in the effect of this Shockwave exerting reverse force on the turbo, and that is a lot of damage fast. You may get away longer on a small turbo, but if your making real power you need a BOV.
Tony Tuite Your numbers don't mean shit, in the real world it really doesn't matter, not to mention they are designed to take that kind of load.
" You may get away longer on a small turbo, but if your making real power you need a BOV."
In Australia and Japan it is very common for people not to run BoV's (especially in the VL turbo and drifting scenes), including people making well over 1000hp without issue.
+DriftNick Ignorance of math and engineering doesn't make you right. Do what you want. I'll keep my car running for the next 5-10 years.
Tony Tuite You know what makes me right? the countless people who don't run BoV's and haven't for many years without issue, your math doesn't mean anything, your wrong about the amount of load it would be hitting the compressor, it's not as simple as the size of the surface area times the boost and all the load wouldn't just be hitting the compressor.
so yea I will do what a want and for some reason I think my turbo will be just fine like it has been for the last 5 years.
The reason I have a recirculating BOV on my Subaru is to help maintain boost between shifts, because of my larger aftermarket turbo. I think atmospheric BOVs are stupid and solely for an annoying high pitched purge sound. Obviously it's to blow off the massive surge pressure from the turbo, but be smart and use that surge pressure to hold boost with a recirculating bov
TripoliVegas how’d that bigger turbo work out in your scooby?
Moog: "let's forget it ever happened"
Yet eleven years later, Moog reminded us about this nostalgic blow off valve video. Awesome.
I thought the benefit of a recirculation valve over a bov was seen by slightly quicker spool up AFTER the gear change?
Yes exactly, this is a crappy video, the whole statement is misleading about venting atmospherically versus diverting, because the power will be the same but what you gain by having a diverter valve is quicker throttle response because you're not losing that boost charge and needing to respool that boost charge from scratch so to speak. So the test should not be total power output but rather throttle response right after a gear shift (when you step off the gas in the course of a shift)
dat engine movement doe....
The first part was informative. Thanks for that. The second part about running on a non turbocharged was sill, but I suppose that was the point.
Holy shit, I'm gunna fit one to my wood chipper for sure! Coolest chipper on the block ;-)
blow off valves arent going to give you more power
if anything theyre just going to improve your shift quality and/or protect your manifold from high pressure
The sound of a blow off valve in a Subaru sounds amazing plus it saves your turbo for a bit longer which is always nice
*****, that's pretty weird that you have "triple valve springs" in a car with no valves! The RX-7 has a 13B Wankel Rotary engine, so I was just wondering where you managed to install your valve springs at!
lol i laughed pretty hard after reading his comment, i rebuilt like 3 rotary engines and I was like uh what now lol
is it this guy who worked on waaaSaabi?
Yes. And the guy who worked on 2sexy
Wasaabi, 20053XY and the 180SX they've been working on just recently. And of course, there are more...
Man at 1:42, he really nailed the sound of turbo flutter. Hard to describe without making the noise, lol.
lmfao when he pulled out the bike
105kw =140bhp. The 1.8 turbo (im guessing engine code AGU judging by the cable throttle) sould be running 150 bhp even without a tune. Something isn't quite right there
Every dyno loads differently, you can only compare dyno results against results from the same dyno.
That's Volkswagens stock number, Isn't it measured at the crank? 150 official horsepower are probably around 120-130 IRL
You don't measure *bhp* on a dyno like that. You measure *_whp_*, which is after probably a _15% loss_ due to transmission. You can either adjust the bhp measure for drivetrain loss or add 15% to the whp number the dyno read out. If you do that, the numbers seem consistent (about a 11 bhp gain).
Oh I figured it out, its a piece of shit who knows what its lost or gained in its horrible life.
The blow off valve has two purposes. The primary purpose is to prevent turbo surging where high pressure air is forced backward up through the inter-coolers and back through the turbo. This surge can damage the turbo bearings; both shaft bearings and end bearings. The second purpose is to prevent over-pressures that can damage boost feed pipes and inter-coolers.
Damn near shit myself laughing at the end XD
Pay more for insurance? I pay less for my 2015 WRX than I did with my Ram 2500 HEMI or even my 2013 Tacoma. I believe i was about $20 less than the Ram but only $6 less than the Tacoma.
With full coverage, $500 deductibles, going from a 2014 Mirage (i3, 1.2L, 74hp, 0-60 in 12 seconds) to a 2014 evo (i4, 2.0L w/turbo, 290hp, 0-60 in 4.5 seconds)... insurance went up almost $40, from $105 to $141. My 2011 Camaro was $130. It's more, but fairly insignificant when you consider the cost of the cars (Mirage 13k, Camaro 27k, Evo 40k).
Ancyker damn that sucks. My ram was a $60k truck so that could be why it cost so much. However i still pay less than i did with the Tacoma, which i find odd. Too many variables are taken into account with insurance. Its retarded.
*****
Tacoma drivers are often going offroad more than dodge trucks lol.
Fireblaze15 yea i took my Tacoma down more trails than the ram. Mainly due to the fact that it could actually fit without hitting a tree.
***** or the fact that the Tacoma is actually built for that.
Amazing. I hope others in 2020 followed the link and watched this vid.
Mark Memory 👋
With a circulated blow off valve, wouldn't you get up to psi faster? Since all the air is being kept in a closed loop system?
Faster doenst always mean more power on a dyno. If your bov is dumping too much air between shifts you would effectively be killing the efficiency of your spool. Re-circulation aims not to do that by dumping vented air back into the intake system. How much faster.. its hard to say but i would be willing to bet that a recirc car with identical driver conditions will perform better than a poorly selected all for noise vent to atmosphere set up.
local tourist yea there is no one size fits all you’ll need to dial springs weights and settings for your set up but you could be right in some setups it could vary I was speaking more overall
@local tourist I think Diesel turbo systems operate differently. Honestly, I dont have any experience there but my guess is they are different in some degree. Tinkering is key finding that sweet spot
I replaced my blow off valve with a modified egg but it broke
This is the very first episode of MCM I watched 3 years ago.
Australia is such pain in the ass, for car people.
huh, why is that?
+Aramis D'Nivra so much laws and rules to cripple car enthusiasts from doing most modifications, if you have turbo car. ooohh jesus 3 out of 5 police cars will stop you for no reason hoping to find slightly wrong fitments just to defect your car. also every price for service and related things becomes expensive 😞.
+Ryizer kovich oh bummer :( i was hoping australia would be an awesome place for car enthusiasts. Can you service your own car over there or is it illegal?
+Aramis D'Nivra some states had a little easier rules and laws but I think you can service you car yourself but someone has to write the papers for you to validate that the car is road worthy .. But im only talking about Sydney nsw not sure about other states
You can service your own car, you only need to get your car re-inspected if you've made modifications.
What i hate is when some people put those damn whistles on their blow off valve, sound silly as hell.
I wonder if they make horns that sound like human screams...
BrrrrrRRRRRRR*cshh-AHHHHHHHHHHHhhhh*
modwlego lol at least that'd sound better than the normal wimp whistles.
+raidkoast my friend has his on his intake pipe custom fit opf course his is an automatic transmission and im just like what ever
I like to add a duck call to my BOV so whenever it goes off it goes quack
Lol Darth, did we see the same video of the guy's turbo Civic where he installed a duck-call on his BOV?
Dang, haven't seen this intro in so long. Crazy it's from 2009, 9 years ago
"...and forget that it ever happened." LMAO!!!
i like it when they were ripping up the blow off valve machine! to many ricers got excited!
🖕🖕🖕🖕🖕🖕☝️☝️☝️
Well gotta support a great Aussie Production!
I wish they would set up mandatory car classes in schools, so every single person who drives a car would have a basic understanding of them. It would make it a lot less painful to talk to people about the subject.
so because you know stuff about cars everyone else has to too?
David Serrano Dude. Either they should know something about what they're talking about, or they should ask questions and not make statements as if they know something. It would be the same as if I went and searched out knitting videos on youtube and then I suddenly decided that I am some kind of knitting expert and started making comments. All the old ladies would get tired of that shit in a hurry and they'd tear my head off. Who could blame them? lol
Humans..
the best way to learn is by making mistakes simple as that. sure questions are fine too, but they would only ask a question if they knew they were wrong. so if you don't have the patience to talk to someone who is learning then you would be the one with the problem.
Americans...
David Serrano lol ok.
+David Serrano do you want to drive a car? do you drive a car? Do you know anything about the thing you gonne spend 1/3 of your life in? Get a clue
The big question now is...
Will it fit my honda?
Nice explanation and good explanation on why its good to NOT let all the pressure out and not starting from empty ,,Lads need to know its NOT all about noise when it comes to performance : )
They should make one for my underwear..
So when i am walking down the isle
at the store and i Fart it will go pssssssss tututututu..
If You try to put a BOV on a non turbo car because you want the sound, you're a poser.
but my moped has a blow off valve am i a poser?
Colin Heasley so if you put a blow off valve on a supercharged car they're a grimp? smh
R Weber I am getting a 2013 Scion FRS and Putting a Greddy BOV on it...aw shucks does that mean I am a poser?...ah well who gives a shit my car sounds awesome! Fuck you bruh! =D
Charlie Santos if it's naturally aspirated, yes.
LiveToRide nice gsxr, bruh
Damn it's been 10 years. Good old 480p days
err... i thought blow off value is to help with the response when u on/off/on gas again....dyno is the wrong way to test it isn't it? ... >___>
Will this blow off valve fit on my honda? (Mighty car mods joke)
BIHMOSTWANTED yes
+BIHMOSTWANTED
K27?
***** Will that fit?
BIHMOSTWANTED
Yes.
+BIHMOSTWANTED does it have VTAC!?
You don't lose performance with a BOV, but you do increase your lag between shifts, as compared to a BPV which recirculates the air back into the intake tract and helps keep the turbo spooled.
Dude lookin like Hugh Grant's younger brother, lol :D
The end is hilarious. xD
Woke up this morning wondering if my BOV would still work installed on my air intake, essentially releasing the intake pressure when you let off haha, video confirmed it can be done!
Does it make the sound?
That was stupid. You will not gain or lose power with a bov. A recirculator will simply allow the turbo to spool faster after a shift because that air is rerouted to before the turbo rather than venting to atmosphere. And the reason you run rich after putting a bov on is because on a system that uses a maf sensor the ecu is injecting fuel for the air you just let out into the atmosphere. You will only run rich for a split second after getting back on the throttle. The only way to get around that is to delete your maf sensor and only base idc's off of a map sensor.
Actually on a VW using a BOV will lose power. They use diverter valves instead. The BOV loses pressure dropping boost after a gear change AKA when it opens up
Obviously you didnt understand what I said. You will NOT lose power. Your engine will make the same amount of power with a bov, bpv, or no valve at all. Bov's have no affect whatsoever on power. You will lose spool time after lifting off the throttle then getting on it again.
But Subaru NEED recirculating ones or else they run rich.
Not if tuned properly.
go rotated, cobb, tial external WG and blowoff valve.....peoples faces when they hear the waste gate scream.....
Whether you should vent or recirculate depends on the design of the intake. If the incoming air is measured by the airflow sensor BEFORE it goes through the turbo (like if the airflow sensor is in the air filter box), then you must use a recirculator valve, or else the ECU will be momentarily confused by air that was measured by the airflow sensor but never delivered into the engine, and that will throw off the fuel:air ratio and change the long-term fuel trim in the ECU. You can't just pick and choose which version you want to run, unless you feel like redesigning the entire intake.
Recirculated BOVs don't add power, therefore not making your car faster... Just like how lowering your car doesn't add power.
Come on, there's more to speed than just power. Recirculation holds the boost, keeping the compressor ready for the next shift.
ChiggyChiggy Chiggy therefor it's faster then a car without one. moron.
SO FUNNY THESE GUYS.....MYTH BUSTERS FOR CARS
LOL, that bov in the bike was funny. I always wanted to put a duck caller on my eclipse gsx bypass valve but sadly I never did.
blow off valves don't increase power they release boost when off the throttle letting the turbine free spin and not let boost push the turbine backwards
and don't forget tutu tutu tutu
bovs dont go stu stus
9:10 LOL, Pushbike? Aussie for bicycle?
Yep
also British for bicycle
This is the greatest video on the Internet. Period.
stfu
Gregory Kitchens ...no
I'll run one on my lawn mower
My lawn mower is turboed and Im running over 9,000 lbs of boost because my grass is really sturdy. I just let mine "stutututut" instead of a "stooooosh" tho
9:06 White S15?
blow off valve is by far my favorite ricer mod
I only want the pssssssss tututututu
+Bainanaz Even a factory turbo running stock boost will make the sound, of course more boost or a bigger turbo will be louder, also metal air intake into the turbo makes it louder to.
you guys do know this sound is bad? running a lot of boost and not having a BOV will make that sound.. oh wait it'll blow your turbo eventually also.
Cole Zormeier no it won’t
DriftNick I know I sound stupid and weird... Is it possible to get the psst shututu sound in a non turbo car..? ( and yeah it's a bit low powered car I meant it's 1.2 - 1.5L petrol engine.
Mesh 3432 nah
why didn't you make the video 10 seconds longer for extra ad revenue?
Ar71 because 2009
makes sense
because back in those day they didn't have le filthy ad revenue
Well not exactly... It's just that the 10 min videos didn't really count... I'm not shore tho.
shor? lol
Great video. I expect the Golf is going to be throwing fault codes though with an atmospheric dump valve. The ECU expects the air to be returned to the inlet like the stanrdard re-circ.
from 2:30 to 3:10 is the only useful info in this video... the usefulness of a recirc valve or BOV is only seen in actual driving conditions and has no effect on peak power... putting the car on a dyno was pointless.
The dyno also showed what happens to factory turbo cars running high boost tunes - they cant hold the additional pressure and leak boost robbing you of power --- thus a NEW blow off valve would actually give you more power while also adding to the sound of the car ---- hi boost tunes on those GTIs crank it up to 20-22psi from a factory peak of like 12 or so
Servicemember80 Thats high boost? My car came stock boosting 22psi lol
Michael Boykin The expert told them that but they decided to ignore his words of wisdom & waste time on the dyno lol
Why the hell would ya want a BOV on a naturally aspirated machine.
Both if done as a package are a valid enhancement....BOV on a naturally aspirated engine would be the same as stuffing yer wifes bra to make ya think she was 34DD..
ok, having a BOV with no turbo.... you're just a poser. Plain and simple. Dont even other responding.
*****
More like 185 in quarter mile increments...Oh on two wheels or four..Trying for my snowmobile
next..ROTFLMAO
because people are stupid and want to feel so cool. Thats my guess at least. Fuckin pathetic people I swear
Kinda like putting 5000 dollar wheels and tires on a 300 dollar car..
still one of the most satisfying sounds ever
2019???
i would be careful riding around on a bike with a backpack on holding a switch with visible wires showing
I forgot about this episode.. have me in stitches every time.
Oh, and ***** - if you're going to lie, at least don't be an idiot. A 13B is a rotary motor - it has no camshaft and no valves. What the hell would "triple valve springs" be, anyway?
Could have saved myself over $5k and alot of car downtime with that BOV
Marlon Lyn your turbo insatll didnt go as planned? im tryna decide weather to boost my civic or get a wet nos kit. what type of car did you boost what went wrong? 5k?
Michael Mack Honestly I was just joking, but if you're planning on boosting there are a couple of questions that have to be asked:
1. How old is the car?
2. Are there any pre-existing issues inside the car?
3. Do I have access to a Subject Matter Expert that's already done this?
4. Do I have access to do work on my car after it's been bosted?
I boosted a 2002 GTI VR6. Still having issues and not %100, but I'm hoping to resolve all of them.
the 5k comes from the price from all the stuff, plus hardware. Believe me, it adds up fast. Hit me up and we can talk more about it.
Marlon Lyn I'm still a fan of boost over bottle (Unless you're talking about building a Higher Reving Bored and Stroke Engine)
Marlon Lyn I have a 96 turbo VR6, and ive spent literally the same lol.
Doug Bedo How is it running? What did you do for fuel management?
To everyone asking the same thing over and over, Turbo FLUTTER is bad. Thats basically a turbo surging and it will destroy it rather quick. You need a sort or relief for that boost thats built up when you let off the throttle to shift and that is a diverter or blow off. You want "tshhhhh" not "stuutututu". My audi actually had a boost leak because the stock diverter valve was stuck open.
I meant add mods not make them lol my bad
you can bro but we gotta keep in mind its an automatic and it may breakk the tranny with a turbo kit.. just my 2 cents
luis luna if you dont know what you are talking about, shut the fuck up, a 350z auto tranny will handle boost just fine. spoox just research!
Absolutely not. Turboing a 350 is very touchy, and even paying a shop tons of money to do it properly the engine WILL NOT handle boost very well. This is the failing of the VQ35 in the 350. Boost + VQ35 = not good. Doing it yourself also adds in the factor of you probably doing something wrong, then paying tons of money for dyno time to tune it. I you want more power swap your transmission, do exhaust and intake mods. Then forged internals and an ECU remap. DON'T TURBO OR SUPERCHARGE YOUR Z.
Fuck man why so the fkn negativity its just a comment... lets be realistic even though you love 350 z's most stock automatics will break unless modded. youc ould off just made your own comment and no need to insult people... are yo on your period or something? lol
luis luna
He might be right but nissan has been boosting motors for a long time. FYI a boosted motor kicking out anything near 100% of it's factory hp (like if your motor came with 200 and you boost it to 400) will only last about a year regardless of how you build it. The only way to get the longevity in it is to start with a motor that is overengineered like theh 4g63 or even subarus 2.5 boxer. I say this. If you want to boost the engine and you want to keep it reliable go with a supercharger. The boost is predictable and easily tuned. Next don't go over 8lbs of boost. That's the industry standard. Every car on the market can handle that from the factory. Lastly if you want to REALLY get power I'd still go supercharged but add internals and supporting mods and boost in the area of 15psi. After that you'd be better off building a motor for turbo.
Honestly I didn't install the blow off valve that came with my turbo kit just so I could get the stututu while revving at the local car meets.
Roses are red
Violets are blue
I have no blow off valve
so my turbo goes stututu
Get a blow off valve it'l reduce strain in the turbo.
Man MCM has grown so much
bom dia sou do BRASIL procuro a muito tempo um barulho de carro turbo para meu carro meu carro nao e turbo gostei muito desta forma que vcs fes este carro nao e turbo nao ne ???
mas um escrito curti pra caramba esta para vlw. ..
English esto dificil para voce ? Merda ... Idiota
turbo Gti with mods only getting 140hp to the wheels, garbage
+wartactics
depends how old the engine is.
over the life of an engine, parts wear and power will fail, My vectra 1.8, ok its a non turbo automatic, may have produced at a guess 110hp when it was new in 1998, its probably now down to around 80 so a 7 year old GTI producing 140, seems about right.
Even the Golf R was never a hardcore hot hatch... The Germans are yet to build a Hatch I deem good.
The Volkswagens look gorgeous but on track they are heavy. They are "Sporty Comfort" cars.
Nåti M you can’t deny how good the s3 is or the amg45 aswell as the m140i and the Leon cupra r. All German built hot hatches
it was garbage when it left the warehouse
1:49 I could listen to this guy talk about cars all day
sorry mates ... turbo flutter ftw
Sounds good, but that's not good for your turbo.
Isn't the flutter sound somewhat artificially reproduced?
sigh.. lol maybe its bcz i got a sweet sounding STI why i think this is sad, but... glory to ricers right?
Our cars don't need BOVs. Our cars have a great BPV that's incredibly effective.
I love your comedy show. I especially like the challenged of translating Aussie into the Queen's English.
My blow off valve has a blow off valve.
My skateboard has a blowoff valve
+Steel Eagle my wheel has a blow off valve
Kruthknar Okeanus Dang, I gotta get my self a wheel bov
+Kruthknar Okeanus my windshield wipers have a BOV. Turn on wipers and pssssssh
My shoes each have a blow off valve