What is TURBO FLUTTER & SURGE? Is it Bad? Myth-busting in our Nissan R32 GTR!
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- เผยแพร่เมื่อ 2 ต.ค. 2024
- Big Single Turbo JDM Import Nissan Skyline R32 GTR - flutters, compressor surge and technical tuning chat.. What is it, how does it hurt your turbo, and does it happen?
Filmed in the StreetFX Forza GTR.
UPDATE:
We accidentally say "Blow off valve" during the video at one point when meaning "Throttle body" closing, this is obviously an error. A blow off valve helps alleviate the pressure in the intake during closed throttle surge, "blowing off" excess boost.
IMPORTANT SECOND UPDATE:
We touch on the difference between open and closed throttle flutter. As an additional bit of information here, it was pointed out to me that closed throttle flutter is actually known as "reversion", whereas open throttle flutter is more accurately called "compressor surge".
Both are technically compressor surge, and both sound essentially the same, however the different conditions under which they occur are important to identify.
"when people say it's the turbo spinning backwards, got rocks in their heads"
LOLOL I almost died that made my day
Stewzy their brains are spining backwards.
Must be the French
Yea like you.
Please show me a turbo spinning backwards when its surging off throttle?
Hakasauars jag rosyzafg
It's the Aussie way. We love the turbo flutter. It's 100% about the sound! Does its damage the turbo? My opinion as a mechanic for 15 years and owned many turbo is no
Will it do it with a stock turbo?
@@carsandcoldbrew6489 no
@UCG3ZTLNnemoeCICJ1vOf1GQ yes it will 😂 you’re a fucking loonie mate
Does the GTX2867R flutter tho?
@@ronyhyper why not?
I rebuild turbos for a living, and what they're saying is pretty much correct. The thing is though, certain turbos can take lots of surge, and others cant. Turbos like Holset's, Garrett GT37R's, GT40R's, or larger with beefy thrust bearings can take a lot of surge out of the box. Turbos such as TD05/TD06's, Borg Warner S200/S300/S400's, K24/K26's, Garrett T3/T4's etc can take surge as well as long as they have an upgraded thrust bearing. That's the one part of the turbo under stress when surging, the thrust bearing. On a turbo with a not enough thrust bearing journal area, the thrust bearing wears out quickly (because it is overloaded with thrust load and the oil film is squeezed away) and then you get loads of in and out shaft play. Then one day the compressor wheel tears itself apart by hitting the compressor housing.
And another thing, turbo compressor nuts are threaded in reverse from the turbos direction of rotation, so they don't back off, they will only get tighter. Basically any OEM turbo is not designed to take the extreme thrust load from surging. Small frame steel ball bearing turbos will develop excessive shaft play from surge as well, ceramic ball bearing ones are generally okay.
Bottom line is most properly built aftermarket turbos with 360 degree thrust bearings, or just plain ceramic ball bearings can take the load of compressor surge. If you surge your OEM turbo it will probably last a good 6 months to a year of daily driving, less if you're running more than stock boost.
House of Boost I have a stock 2015 evo and I was thinking of buying an aftermarket bov like Gfb.... any tip would be gladly appreciated.
go ahead, i dont have any tips there other than i personally like the tial q bov for its sound. obviously get a blockoff plate for the diverter valve and have the car tuned to a bov
House of Boost probably the best thing i read out of this whole shit talking comments about uneducated big babies lol.
House of Boost that's the best shit i read ever
Thanks for knowing how to explain, we need people like you in this comments...
Dude this eased my mind quite a bit. Thank you lol
the comments here kill me lmao all these people saying these guys dont know what theyre talking about just because you all sit on random forums and read articles, yeah the guy who has actually owned tons of high horsepower turbo cars is definentally less informed than some 12 year old behind his computer give me a break.
ahaha we deal with it daily :) internet mechanics :D
Not defending internet mechanics, but owning a powerful car (or cars) doesn't always imply knowledge, it just means someone has money. When shit breaks they'd just take it to some guy who sorts it out for them. Same goes for upgrades; "Here's my credit card, give me more power!" (Not saying this of Street FX Motorsport guys, but I do personally know people who have things like GTRs and haven't a clue about the technicalities behind them, they can reel off lists of numbers though like bore, stroke, whp, shp and torque without knowing shit about what they mean! - it's like they're playing a game of top trumps or something lol)
UTxBEAST96 I trust the words of folks who engineer and design turbos and BOVs. Not dipshits like this.
You trust the same people that made said turbos before BOV's were a thing?
You do know that half of these companies popped up after the car craze that fast and the furious caused.
Go to any company thats been dealing with modded cars from before that and they'll tell you they arent needed. Its a gimmick to sell you something you dont need.
You do know that BOV's are relatively new. OF course a company that makes turbo's, BOV's and other things is going to tell you need a certain part so you'll buy the part.
Take a look at all the older cars with turbos. NONE had BOV's. None of em. They all ran just fine. As a matter of fact a neighbor still has his old grand national with a turbo as old as I am that came with from the factory. No bov ever and the car still runs strong.
There is no NEED for it. If you want one. Get one. But its not needed.
If the car is surging under load its a tune/mechanical problem. Not the lack of a BOV.
squishypitbull this is the stupidest comment on here. They also didn't come with air bags or seatbelts at one point. Doesn't make it a better idea. There's a reason EVERY factory turbo these days comes with a blowoff/bypass/recirculation valve. "My neighbor, friend, sister's brother" stories... Always fact based right? STFU.
I can’t stop looking at that perfect dashboard lol a r32 with no dash bubble
People dont realise that a turbo technically stalls as air pressure drops around the blades when the throttle shuts and no blow of valve is there to allow all the built up air to escape before turbo. When the throttle shuts and all that pressure comes back through the turbo it causes the blades to loose grip of the air due to the low air pressure and making it spin at the same speed without actually making any boost. The turbo blades then eventually grip back onto the air when air pressure rises around the blades again. the sut sut sut noise is created by the turbo constantly loosing grip and grabbing in short matters of time.
You're talking absolute rubbish. The SOUND is created by high velocity air flowing back through the tight clearance between the inducer circumference (blade tips)... and the compressor housing. Same principle as whistling with your mouth.
The flutter (sututututu) noises are caused by the throttle snapping closed and all the air thats already heading to the intake gets stoped and fills up the intake pipes all the way back to the turbo, and forcing it way through the compressor fan while its still spining at its ridiculous rpm, forcing the compressor fan to cut through the air, thus making the flutter noise
That's exactly what we said ;)
Street FX Motorsport TV verbatim.
Thank you. Did a much better job explaining
You can see how it can effect the inadequate thrust bearing especially at high boost i.e 2 opposing forces
so what do you guys think, with flutter caused by throttle closer as Jimmy points out above, would that hurt the compressor or not? If the BOV/BPC was set up correctly, I thought it should vent all that excess pressure between compressor and closed throttle plate, and there would be little to no air having to escape through the spinning compressor wheel, and hence no flutter?!
Turbo surge can also be your tune! Two reasons are,too high of a boost level at too low of an rpm, and even if in high gear and high rpm, your throttle body percentage (amount open) is not at WOD so partially closed will add resistance to the turbo and cause higher boost levels but would be a “false” reading because the turbo’s flow is maxed out at the throttle body instead of the boost pressure being maxed out at the cylinder or behind the intake valve.
To summarize - Compressor surge when on the throttle is terrible and can kill engines/turbos. "Flutterdumps" (no BOV with boost reversion out of the intake) when off throttle/throttle closed is slightly worse for the turbo bearings than running a BOV, and will slightly reduce boost response between gears. It does sound fuckin' mint tho hahaha
Yep, we mention this in the body as we didn't address it very well in the video.. However I would be interested to know exactly why this is any worse for the turbo than normal closed throttle surge..
I had always been told because it slows the compressor down quickly (not stops!) it can wear bearings out quicker. I have no researched data to back that up tho. Perhaps you could do a collab video with a turbo manufacturer or repairer in the future that covers such things?
Legotruck82 we plan to do that :) I just struggled to see why closed and open throttle surge would impact the turbo in differing ways, since they both subject the turbo components to the exact same conditions. It's a great question though :)
I think on boost flutter could be a little worse because it's pushing hard on the exhaust side at the same time as the intake side is slowing the compressor wheel down. A bit like being on the throttle while braking wears the pads and rotors more than if you were only braking. If you shut the throttle there is no exhaust gasses pushing on the exhaust side. But on boost surge would create opposing forces. But then again that would only try to twist the axle witch it could never do anyway. But considering the angle at witch the force comes on to the blades (pushing from the side) I don't really see how it could effect the wear of the turbo, because it would require the axle to move enough sideways to break through the protective oil film and hit the bearing surface. If there is any extra wear I don't think it would even be measurable.
good point, I'd never thought about it like that.
LMAO, This subject seemingly will never die! As a 25 year Veteran of the Melbourne Boost Car scene i've been absolutely gobsmacked by the vastly differing opinions by those in the know about something that in essence Is mechanical science. My real fascination is with the differences of opinion coming from the guys at the very top of their respective specialities ie: VL Turbo guys, Rotary Turbo Guys, the XR6 Turbo crew, and of course the GTR and Supra workshops. The mechanical science is simple!
Its not "Good" for the turbo! but Its not going to kill it overnight either. But what's very interesting to me, is how much the boost car scene has evolved into various sub cultures! Way back in 1996-99 Era when the bright orange MAZTECH RX3 13B Turbo was running 9s (Unbelievably fast in 98) it was all about extracting as much power as possible, but in 2017 making power is piss easy if you have the money, so now other factors seem to be desired. I've had many serious conversations with certain "Younger" individuals that in all seriousness spend mega dollars in search of the "Perfect Sounding Flutter" NO BS!!! I recently asked a younger guy if he had a blow off valve installed somewhere in amongst that harmony of dosing, fluttering, external gating, devices? To my utter astonishment his reply was simply "Na bro, i'm not really into those sorts of noises yeah" ok now i feel old :(
Josh Brookes Cause they are uneducated. Street Fx doesn't know shit either. He is just a rich guy who can afford shit to break. He doesn't even work on his cars but workshops and educated staff do the work. So its simple really, surging the wave of boost back into the compressor is OBVIOUSLY DESTRUCTIVE and shouldn't do it, but the fanboys and 'oh the flutter is so siiq it makes me moist and gets all the bitches' roll in, then talking shit about properly done up & tuned car. There was this guy running his car N/A to Boosted without a tune and going around saying he is the top shit cause his car now makes tut tut noises. I wanna kms
Some of the best engine builders and tuners in Australia don't run blow of valves/bypass valves on the engines they build/tune, unless you consider them to be uneducated? StreetFX can afford to fix shit if it breaks but he also hasn't had to replace a turbo because of flutter.
DriftNick I dont know of these tuners. Any high hp making car I have seen has a blow off & set to not flutter. Kids make wanted flutter. Any racing car has correct blow off & waste gate set to not flutter either. So...
DriftNick You do what you want with your car, but when I build mine, I build it to perfection, and that excludes flutter cause I personally from all the knowledge I have, is bad. ( i think its bad)
Search "50psi boost 1200+hp Nissan RB30" on youtube, more videos on that channel of high hp cars not running a blow off valve/bypass valve.
Here come all the 12 year olds saying "I have a gtr and my dad says it's the sound of the blow off valve"
Are you able to get the pigeon/flutter noise on any car? Or does it matter with engine.
As long as you have turbo
always i have a "noncar-friend" on my urs4 and when it flutters and i say to my friends "squirrels escaping..." and my friends look me with weird look in his eyes like "wtf dude?" :D
I was always told if it does the flutter while on the gas it is bad, if it is happening when you let off ONLY then its okay.
I had rocks in my head :(
4:50 I guess you could say his turbo.... hit the fan?
Always thought compressor surge sounded like Curly from The Three Stooges. In other words...silly.
"Come back here, you!"
(runs away) "Woobwoobwoobwoobwoob!!!"
Nuk,Nuk,Nuk .....
Zoidburge from futurama had a cummins 12 valve that made that sound of woobwoobwoobwoobwoob first time I heard it make the woobwoobwoob sound I named it zoidburge hahahahaha
Thank you for clarifying, now i can show people this video instead of trying to explain why they're wrong. The only thing i noticed is that with no bov on my mr2 i actually had a MORE RESPONSIVE turbo while changing gears...when i ran a bov there was MORE LAG while changing gears at WOT. Thats the only thing in the video i noticed that was different from my experience. CHEERS!
Some high boost setups will compressor surge. Especially if you don't reach peak boost before you release the throttle. The BPVs in these setups are adjusted to stay closed during spool until that high boost target is reached. So when you release the throttle at partial boost in these setups you get "surge". This is the only time compressor surge is acceptable to me. I've been building and tuning engines/cars for over a decade.
I dont care if it brakes my turbo then i can refit a biggerone😱
o shit you mean buisness
If you're getting surge on boost its usually because you are not limiting low end boost, big turbos don't like running high pressure ratios with low flow . Which would be right in the middle of efficiency island of a small turbo. This why a lot of setups ran a small and big turbo, yes the small one can spool up quicker for the low end but it can also sustain more pressure at lower flow allowing more boost at low revs without surge occuring.
The damage you can cause by surging is primarily to the thrust washers particularly on journal bearing turbos. When the shaft bashes back and forth.
If you run oil good pressure and have tight tolerances the shaft can't move and pick up as much speed when it moves back and forth which is what is going to kill the turbo. I think smaller turbos are more susceptible to damage since they typically don't have the relive holes that you see on big turbos and smaller turbos in general are just cheaper and may not have the same safety margin as a big turbo might.
Compressor surge is the sound of the blades chopping through the air that is being forced back through and out of the intake side of the turbo. Not good for the components of the turbocharger but not going to immediately destroy anything either.
Chopping through the air Hahahaha
Sancho it is ;) think about a helicopter flying into the direction of the wind ;) same principle
Who the fuck cares. Its also good to have a catch can for your motor. How many cars have those.....
@@AlphaFlight I doooo.
Im pretty sure its the air passing at very high velocity through the tight clearance between the circumference of the inducer (blade tips)... and the compressor housing. The same principle behind whistling with your mouth. I don't think the "chopping" has anything to do with it.
the first flutter was devious
Perfect for cleaning out the KN filters
My r31 Skyline doses been like that for 4 years turb is still strong as not 1 issue
This is reassuring, thanks
thank you. it's refreshing to hear sane people open their mouth and share this thing called knowledge rather that complete numb skulls who know sweet F A and sprout complete and utter rubbish to me. Another thing you might want to add to this argument is the detrimental effect caused by adding a BOV to car running an air flow meter as opposed to map sensor. Running a bov on some cars will without a doubt right royally f*@# them i.e some models of WRX for instance. On others it may not wreck them but fuel economy and general performance (or lack thereof) goes up the sh*t. Usually the same numb skulls who argue that bovs are necessary are the same idiots on forums asking diagnostic questions like "my car's running sluggish and fuel economy is out the window, does anyone know what things I should check for incase my engine's blown or something?"
my responses is always a question does it have an aftermarket bov? if the answer is yes I instruct them to check for a brain 👍
Loved the video, I know exactly where you guys were filming this ( cause I live nearby) & the traffic there is shocking. Wonder if this is similar to how a diesel flutters or dose. But they don't have a throttle body of any kind as they run rpm from the fuel pump, so what's the compressed air getting stopped by to come back towards the turbo? The valves just before the combustion chamber?
For all the ppl asking or assuming it damages the turbos components.., it’s both yes and no… the rotating impeller speed, it’s seals, the inner clearances, the bearings.., by numbers on paper and science yes it SHOULD hurt components BUT how many videos have you seen with ppl showing damaged turbos from surge?? None..
It sounds like nails on a chalkboard and is bad for the turbo bearings. A blow off valve sounds great and saves bearings, intercoolers, boost pipes and hose clamps.
Well it's a good thing running no blow off valve doesn't damage any of those things.
@@DriftNick just running and time damages them. Unnecessary boost spikes increase the wear on all of them.
4:46 You don't think the vibration/stuttering/shock from the compressor surge attributed to the loosening of the compressor wheel nut? Gotta say I completely agree with almost everything you said. I really dislike the noise of surge so I always run plumbed BOVs. Each to their own :)
Just saw your previous reply stating the car in question did have a BOV and a very badly worn turbo.
I have installed blow off valve spacer in my Fiesta ST 1.6 230 hp for the whooosh sounds and even though everything is installed correctly, somehow i get the turbo flutter upon releasing the throttle which shouldnt be the case. But i quite enjoy it, question is... is it safe for the stock small KP39 turbo? :D
Stutututu...Great! Love this sounds,greetings from KK Sabah,Malaysia🇲🇾👊👍
The surge while on throttle seems sketchy lol. And seems like the car is kind of cutting out every time. Down size the turbo I guess
i had a mitsubishi 2.0 engine NA that would make a farting sound between WOT shifts and everybody thought it was a turbo. All it had was a $1 ebay Apexi knockoff coffee can exhaust and no turbo but it sounded MAD
Nice vid, but you did sidestep the point that compressor surge when on throttle is bad, because you're trying to spool the turbo on the hotside but the compressor side cant push the air, so it puts the turbo under a lot of stress.
Going up mt lindsay i see Fuck oath ahaha.
It's the compressor [fan blades] stalling which makes that noise.
funny how you say people who say the turbo spinning backwards must have rocks in their heads, yet you guys think it's fine for a turbo to surge lmfao. all I heard for the first half of the video was why there is a noise, not what's actually happening. poorly tuned cars have surge, bad wastage pressure, bad recirculation valve, etc cause surge and surge is the turbo trying to slam to a stop because the intake side is trying to stop but the exhaust side wants to spin... hints the surge. like when you have wheel hop... your wheels want to stop but the axles are not allowing it... do it too much or hard enough and something will break. I honestly thought this was common knowledge with actual car guys and not fast and furious car guys.
This is great information. So why wouldn't you put dual BOVs? One at the intake inlet where it typically is mounted and one near the FMIC like most of the Supra and GTR guys.
My twin ball flutters like crazy, Even granny shifting at 2k around town.
I was driving with my father on the highway when the intercooler blew up.
Did you hit a pigeon or something
@@nolesy34 no, the turbo just suddenly supplied less compression, but we still made it home.
Why is it whenever you find a straightforward and knowledgeable videos it's an Aussie channel?!
Love your work guys
Xr6t should be dosing soon ♥️
Papadakis racing is a great channel if your into how everything works!
THIS CAR IS LAUGHING SO HARD AT YOUR DRIVING SKILLS!!
Great effect tho. Great Video :D
I love this sound 🤤🤤🤤🤤🤤🤤🤤🤤🤤🤤🤤🤤
I'm just here for the sssstu tu tu tu..... 😆
So ppll think a turbo spinning can suddenly go from 220000 rpm go backwards then go back 220000 again to produce 50psi. BITCH PLEASE
🤔BoV and BPV needed during high horsepower applications.... staring at Subaru's Type RA that they developed with prodrive.... that flew through goodwood with ease and no problems....
My diesel audi makes this noise, no fucking with you, much more subtle but it still does it.
Sorry..These guys are wrong.. when u close the throttle blade the turbo compressor does not slow down.. it actually creates areo slip and SPEEDS UP.. lots of misconceptions with this.. do some research
Is that car allowed on the street because it has a aftermarket steering wheel and there are legal on Australian roads
Compressor stall is something inginerds work VERY hard to prevent in most scenarios. In severe cases it can take chunks out of compressor blades.
Hey guys. Y’all explained this great... so if I want this flutter, should I just delete my blow off valve?
I ran without a BOV on my Saab for a straight year. With the unreliable turbo. With 185k on it at the time. It's now at 197k and I have a BOV again, but it's still fine, lol. I'm not saying it's completely save and the smartest thing to do... but people blow it way out of proportion.
Why take the chance?
If i recirculate my blow off valve will my car flutter? I have aftermarket intercooler piping and titanium turbo inlet pipe with a cold air intake
Makes wanna turbo my shitbox cavalier i know its a waste but it would be so nice to hear
I use a boost valve , because use a bushing turbo, and I can't afford to loose any spooling.
Why do some TH-camrs says it damages it over time
Yes there are many things that can go wrong
Improper cool down
Too high a level of boost
And if there ever was a wastegate or bov failure gases that need to escape would gradually wear the mechanism over time
Because they have zero experience not running a blow off valve and have no idea what they are talking about.
Why the hell would anyone purposely want that dumb ass turbo flutter sound, or as I call it, grandpa farts.
"All the cards flying through the air" is very much due to the BIG ASS fan in front of the car. If you look closely, the car shutters when going off throttle which causes the stack of cards to move enough for the fan to blow them away. I find it nearly impossible for the boost pressure to come out the inlet side of the turbo. At that point it would HAVE to make the compressor wheel turn backwards.
It doesn't make it turn backwards, the air does come out the inlet side. It physically has nowhere else to go.
Turbos spin at 100,000rpm, it cannot suddenly stall and go backwards.
The flutter sound is just bad sounding. Not letting a blow off valve sing is a crime
you say blow off valves help the boost recover faster and reduce lag others say blow off valves do the opposite and create more lag and that's why drift cars etc don't use them, because they are constantly on and off throttle.
He even said the problem. He is running bov spring too tight. The bov is fluttering opening. If he looses up the spring a little it would stay open like it should. Can’t believe you people
The blow off vale is not fluttering open, it's not opening at all when you hear the flutter sound.
My turbo flutter on my 2013 audi a4 sounds amazing video is on my channel. My turbo is 4 times louder than this car in this video
if u have a nice turbo its not gonna hurt it that much but if u have an old turbo or china turbo just run a blow off valve it is cheap and still sounds cool and can extend the life of your turbo.
Sounds stupid to me. Regardless of harm or not.... BOV sounds are better
Never. Never; blown a turbo......except for that one turbo that i blew. 😂😂😂
Compressor surge------bad.
Turbo flutter----------------not bad. They are two different things. Cars had turbos long before BOV's were invented and they all did just fine. Hell older rally cars (and even some now) dont used BOV's and those things take a beating yet still have to be able to make it from stage to stage and for everyone saying "at low boost its ok but high end its a problem" Think about this.
All the car companies that made turbo cars porsche included had cars with turbo's in them before BOV were a thing. Did those cars blow up randomly? NOPE.
As long as your turbo is of semi decent quality you wont have a issue with FLUTTER.
Compressor surge is not flutter although the noises sound the same and compressor surge can cause issues as the turbo is under load I.E. working to make boost as its having problems doing so.
flutter I.E. when no more throttle is being applied all thats happening is the already compressed air that was in the piping is being let out.
end of story is flutter is fine, Compressor surge is bad.
+squishypitbull if you watched the video you'll see we explained the difference between normal flutter (closed throttle) and open throttle surge.
Street FX Motorsport TV it's the same thing, you guys explained yourselves. didn't you just tell us the only difference is in duration? that's what I heard you say. and why would the nut fall off? derrr
I know....It was mainly for the internet mechanics that most likely dont even drive a boosted car...let alone a highly modified one and think they know what they're talking about lol
My 1.9 jtd turbodiesel did that sound when my VNT valve went bad. Didn't know such small turbo can do it. It was cool but the car was almost undrivable, and in the end I found it literally spit some oil into the MAF and air filter :)
But how do you obtain the sututu sound with a smaller turbo
Dial up boost with a controller
@@nolesy34 where can I get that or how do I do that
@@alexr3986 harrys performance
Just let them know you need NOS
And Alex
You need it
TONIGHT
The driver talks so much rubbish, it will wear your thrust bearing sooner or later, and turbo compressor nuts don’t back out or become lose, they are screwed on in the opposite way so if anything, they get even tighter. So cocky saying he’s owned all these cars and whatever, doesn’t even know he facts of what he’s talking about.
Fact: new turbos don’t have the same issues with thrust bearings due to them being ball bearing and can handle lateral loads.
Fact: have owned enough turbo cars and driven enough kms to have first hand experience to if not having had any issues from not running a bov.
Fact: the nut on my old t66 front wheel on an MA70 Supra did in fact come off and destroy the turbo, so it is possible they can undo themselves.
Talking from experience, so I am more than confident in everything I said.
Depends the turbo dudes. With anti surge turbo you will not ever brake anything with flutter. Its not turning the turbo wheel backwards but the trapped air hits back the compressor wheel cause there's no elsewhere to go. So 2 things will go wrong brake the shaft if the shaft its not that strong or destroy the wheel wings on high amount of boost. I've seen both of them situation.
So basically closed throttle surge is like you blow air from your mouth on a spinning table fan and the noise it makes is the stutututuutuu
Hahaha. Kinda
Normally I don't like channels like this, but I'm surprised Street FX Motorsport TV. You do a decent job. Kudos. Unlike Motive DVD (Who even owns a DVD player anymore?)
When I cranked up the boost on my $100 Pontiac Sunbird without a BOV the Turbo was done in a few months....
"When I cranked up the boost" That is the real problem.
looks familiar.. is this a barbie car who won 9k dollars vs lambo?
This comment section is hilarious! 97% of these commentors have no idea what they are talking about. Proceed with caution.
if you're not runing bb turbos, it'l make your turbo shit in 500miles
Also not true. One of my supras with 700hp was fine for 5+ years with no BOV.
I have a question, if the air is coming back out of the turbo will that affect the MAF sensor if it is set on the intake side of it. Just thought the car would be regerstring that it's still getting air coming in when it isnt.
burger14uk yes. Sometimes mine will stall if I do a pull and put it in neutral fast. It will over fuel and cut off
My stage 2 2013 audi a4 has that turbo stu stu & videos up on my channel
It looks amazing
I appreciate the info thats not just on the surface, ive heard a few N54 (bmw copy of the 2jz) BMW e92 335i cars have this surge sound before but VERY VERY few have it, im willing to dump a bit of performance for that sound, how would I get it? It seems to be a mystery in the community for that engine at least, some say BOV but the only way I can see that is if the BOV has a super hard spring In it
Don't run a blow off valve and have a metal intake pipe going into the turbo, it will flutter.
Music to my ears
I saw a vid of the car with the girl in the intro on IG. She got quite scared from the power.
Basically just saving money not to install a BOV/dumpvale.
Wonder why manufacturers install them after all the research....
Why do some turbo flutters sound really low pitched and weird?
and its not just because of the throttle plate cuz diesels do it too. just sounds deeper
Irresponsible to say it’s not bad period. Some cars cannot handle it at all, for example my n54 had a 25psi BOV set by previous owner and my bearings were absolutely shot due to the surge. depends on the turbo
I think it would be helpful to hear the opinions of turbo manufacturers and veteran rebuilders as to the potential damage or accelerated wear from closed throttle surge, before drawing any conclusions. Might end up paying a high price just for that funny sound.
The turbo that the nut came off and you claim wasn't caused by turbo flutter, are you so sure? Given that both the turbine wheels are connected through the shaft, when the inlet impeller slows down, it will be trying to go slower than the shaft and exhaust turbine which doesn't have a restriction of airflow slowing them down like on the inlet side when the throttle is closed. The inlet turbine wanting to go slower than the shaft will put pressure on the holding nut. And the pressure put on that holding nut will be in the direction to undo the nut. So not really surprised the nut eventually worked it's way off.
As we mentioned to another person who asked that question - the Supra in question that had that happen *did* have a blow off valve.. It was also an old-style bush type turbo though, so it was probably due for an upgrade anyway.
i have this loud breathing sound but the car dosnt go anywhere untill the revs get up there more around 3 to 4000rpm and the boost comes on...why does it breath like this..to me it sounds like lagging...its a ba xr6 with a 35/40...when the breathing goes away it is fast but under 3000 rpm its just "waiting" to get on the boost...iv had other ba and had no problems...i no its not a gtr but its a turbo issue let me no if anyone has thaught...besides "buy a gtr"
Turbo shafts are balanced.. this actually ruins that, and yes it's wrecking your turbo.
+++ AMEN +++
Cant remember what controlld how much boost your engine gets. Doesnt bov also decide how much psi your engine gets? So if you remove it then you could send upwards of 50psi amd send your pistons through the roof? Cant remember if thats what the bov does also amd where you cam control how much psi it gets in mega squirt
Route a boost gage to the compressor housing to see how much pressure it is seeing when the surging occurs? That noise could be interpreted as boost spike, maybe? Which would mean unnecessary stress to turbo internals.
Still gonna send it though... (just my opinion)
Me at 6
Choo choo train go choo!
Me at 28
Choo choo car go choo choo 👌
My 1.8 vw jetta dose this surge sound ......I don't see any issue , not lack of turbo spool or anything ......my bov spring is tighter tho , but good enough when u go full spool it blows fully
What you're saying is almost 100% correct but the fact that you're saying that it is the turbo that stalls that's almost just as stupid as saying that it's the turbo that's spinning backwards, the flutter is simply boost that's returning so air that's returning and smashing against the blades of the turbo, a helicopter that's flying into the direction of the wind is also making a chopping sound and it's the same principle ;) anyways good video and good explanation :)
so this isnt safe when u do it on a pair of ct12a that come with a 1j?
To me best argument is when those people/kids are argue are that dump-valve sound, wastegate, compressor surge, flutters etc, etc... :D :D :D
so if this car has a bov how is it still making the noise?