Is it safe to vent your Blow Off Valve to atmosphere? [GO FAST BRETT]
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- เผยแพร่เมื่อ 6 ก.พ. 2017
- One of the most common questions we get on the show - is it safe to vent your blow off valve to atmosphere? Today we find out, on Go Fast Brett.
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all I needed to hear was one person saying its okay to vent to atmosphere, now I'm gonna buy one
Running this BOV would you need a tune?
@@OhanaTigersRuiz14u no
Lol
Atta boy, just got one put on my ST with a true vacuum source and it sounds amazing! Do it.
I dun need validation I just need my car to go Pshhhh psshhhhh!
so when venting to atmosphere the mixture becomes rich meaning not all of the fuel will be burnt dumping un-burnt fuel to the exhaust where if sufficiently heated may cause it to reignite.... AKA shooting dank ass flames
S-man 16 I like the way you think 😏
S-man 16 EXACTLY WHAT I THOUGHT
Carmicha3l it vents when throttle plate is closed and there is fuel cut off when throttle closes therefore not dumping much fuel with an atmosphere blow off, as explained in the video
Carmicha3l I often hear people complaining about the reliability of modded Subarus
If it is so unhealthy to run the engine rich then why do a lot of modified cars (including mine) run on decel ignition cut and not decel fuel cut?
It didn't blow the turbo on the Subaru and it doesn't wreck your engine.
Please provide me with facts towards your argument.
The answer is yes.
I recommend getting a GFB TMS respons hybrid BOV so that way you can vent whatever percentage you want and won't trigger a check engine light
The absolute best thing you can do is, get an adjustable one, when you’re racing keep it closed and when you go to a meet, open it up.
Venting to atmosphere sounds so much better though
Thank you Go Fast Brett!! Always a delight to devour your knowledge!!
I'm liking this new series and how technical it is. As mentioned in the video, it's good to get a professional opinion that isn't some bloke on a forum site.
Very true!
Just a Bloke that works for GFB and is trying to sell you stuff......
+Truzo doesnt mean the info isnt pertinent.
Good information and friendly as always. Thank you, Mr. Brett :)
Awesome video guys, love that you are helping to clarify issues you've found on the internet with people that actually know what they are talking about!!
I was just wondering if you could clarify how you would go about determining the correct spring tension for your b.o.v in order to not cause stalling or backfiring. I.e how do you go about setting it up correctly ??
Cheers
And love the videos !!
This was great and very informative, thanks Brett and GFB!
fun fact, Brett means Wide in Swedish, so go fast Brett in Swenglish translates to Go fast Wide, as in when you drift. or "åka på tvären" as we say here. great series btw
so happy this show is still going I love the GFB series so informative!
I love the nerdery of this series. It's so good.
Go fast brett, shutting down forum know it alls.
Love it.
This was the most informative video I’ve ever watched on TH-cam re - BOV. Top job mate 👍👍👍
I've been trying to figure this out for 5 hours today and finally stumbled on this video. I have a 2014 Jetta GLI Autobahn (GEN3) and the forums are just like you said. Looking for a dual port valve now. Thanks
This guy is amazing, very good information and explained well, thanks for the wisdom mate, appreciate it!
Intestine video! On the turbo system that's on my Focus, the blow off valve is before the MAF so it makes no difference to idle or AFR when I vent to atmosphere. I'm also using an OEM diverter valve off of an Audi, and seems to work just fine as well. But of course, I specifically designed the system to have all of the venting stuff before the MAF so I could avoid all of these problems. But I don't know if most OEM turbo systems work that way, so probably trust Brett ;)
i'd like to see a follow up of this covering the differences between EFI systems using MAP sensors instead of MAF sensors and also Blow through Carby setups.
Thank you for clearing this up with actual knowledge
Great video. Very intelligent, and excellent message delivery. Subed, hope to see more.
That 2 port blow off value was the best item I purchased for my rexy. Made the best sounds, and when I got pulled over, I just quickly turned it to 100% recirculation and got away defect free :)
do you backfire a lot more with it?
@@moto324 i have a proceed GT and haven't noticed my car to backfire any more than it already does. I have it half open, and i keep myscrew driver handy, in case I need to adjust mine, as it has a manual adjustment lever, not fancy remote control haha. The GFB DVX is what I have.
Perhaps you could walk us through how this would affect an engine running without an air flow meter? Like with aftermarket ECUs and some OEM's, like Saab Trionic 5. Since these systems doesn't calculate fuel based on air flow, surely they respond differently to the use of atmospheric BOV's?
Thanks for this info! Very Helpfull!
Good video I found it was just easy to move the maff after the blow off valve that way the air that is being discharged never passes threw the mass air but yes most GM that I tune have DFCO deceleration fuel cut off as soon as your foot leaves the pedal your AFR is flat lined shutting off fuel. When tuning even in open loop with DFCO disabled still don’t see rich conditions even if so a little extra fuel will keep them cylinders cool lol thanks for the info brother God Bless
I did ecu tune , down pipe , bmc filter and renntech bov for my amg gts , but it still runs like a stock amg gts just a bit faster.
Is it because of bov
This guys explains it nicely. Thanks Brett.
Thanks Brett. 👍
How do you know if you got the spring preload right on a Kia Cerato gt?
Best explanation video around!
Thank you for talking sense!
wow thank you for this video, super helpful
Great video and topic.
One thing I wish were in the video was talking about the autocorrect aspect in most oem ecu's. Factory ecu's usually adjust the mixture a tiny bit if it thinks that the mixture is too lean or rich and it's usually just an adaptation factor and once it reaches a set percent it will cause a CEL. eg. ~15% in Saab's . Could a BOV be enough? (I kind of doubt it unless you drive really erratically)
So mostly you'll get it for various other reasons, eg. an air leak. But could a bov cause it?
Awesome explanation!!thank you!!
So an adjustable blow off valve apparantly allows to tune how many flames you shoot out? I love it
Awesomely explained.
I have a GFB Respons installed on my Impreza... really nice valve!
SiriousSandals Did you need a tune?
Does yours backfire?
@@Tony-tk4ht Every now and again, sometimes get a big pop after a dump
If you plan on setting up for flat foot shifting than I would say a recirculating BOV is better. If you are not doing that it doesn't really matter. Having a vent to atmosphere BOV can also cause backfiring when you shift or let off the gas. Backfiring and shooting flames out of your tailpipe is nifty.
I have a question
How do i know, that the blow off valve it's set up correct ? if i take my diesel car and put a valve on it, when do i know the setup it's wrong. You say it can makes a back fire, if it's setup wrong, so do i need to set the valve on it, og adjusting after what it sounds right ? It's maybe a dump question, but just to learn more.
But a great video, just what i wanted.
what's the correct way to set the spring pre-load on the BOV? doesn't venting or recirculation depend on the way the car reads air (MAP sensor vs. MAF sensor)? thanks Brett
missed this so much
i've got the gfb dv+ installed together with a forge spacer..i know the gfb is good on its own but i wanted abit if turbo bov sound is it ok to combine the too am i losing to much boost?
If you run a MAP sensor rather then MAF you won't experience lean conditions ! Surprised this wasn't mentioned.
alexnelson09 rich*
You mean speed density off of your MAP. I have a Speed 3 and we have MAFs and MAPs. But our air is metered at the MAF, so we end up venting metered air, getting idle bounce, afterfires, etc., esp if you're venting too much. If you vent just a little, you're usually okay.
It was sort of mentioned. Brett explicitly said "if your car has an air-flow meter"
Numinous For a stock 2004 Subaru Forester xt turbo, which BOV would you recommend and would you also recommend a 50/50 ratio? Thanks
Some people's MAF and IAT are sort of spilt up, you can move your IAT right before your manifold after the BOV. Then delete the MAF with a MAP based tuned. Obviously only can do this if you have a MAP sensor on the intake somewhere. Boom problem solved.
Hey Brett, I've got an S15 which has been tuned with an atmospheric venting BOV on it. I want to get an adapter for it to make it into a recirculating BOV to get rid of the backfiring. Would I need to/benefit from getting the car re-tuned?
It really depends if the turbo vents upstream or downstream of the MAF sensor. I had a 21 bronco that vented upstream and swapped to vent to atmosphere and never had an issue. However, I could see how venting to atmosphere with a turbo after the MAF could potentially be a problem...
go fast Brett I need your help, I'm planing on upgrading my stock wga to an aftermarket one (2008 caliber SRT 4) should I delete the solenoid valve to my wga?
Is it possible to increase the boost if you have the latest tech diesel car with a electronic stepper motor that moves the waste gate
I still have questions about using my factory recirc bov to vent to atmo.... as long as I blank off the hole left in the low pressure side of the intake, I should be okay, right? As the BOV must by design be closed whenever I’m on boost otherwise there’d be a leak in the system, and no boost....
I have a 2013 wrx it's stock and wtb bov would it affect problems in the long run for me ?
bwaaaaaaaa sutututu
Deivi Y how do you know the sound i make when i shit?!?!?!?
Deivi Y from your dump pipe?
More from the wastegate
Woooooottt pshhhhhh***
Sututututu is the Turbo.. due to an Anti-Lag system.. lol not the BOV.
So how do i run my car that has an in cab remote to adjust open or closed without stalling? I have gfb was already installed on my car when i bought it and when its 50/50 and over it stalls :(
Fantastic video, thank you :)
Fgx xr6 turbo..if I got my car tuned bigger turbo injectors intercooler etc with the bov blocked completely off then few weeks later hooked it up for re circulating it will that cause a lean condition when coasting or light acceleration..I'm getting no where on the forums
after installing 300zx maf on sr20det and dumping to atmosphere my engine actually stalls anytime it dumps to atmosphere,the fix was recirculating but now i have no bov sound. do you think the dual port will give me best of both worlds where i can keep maf happy enough to not stall and also retain bov sound?
Brett. You mentioned a MAF sensor set up but didn't mention a MAP sensor set up. Is there a difference?
Do you need tune to your 2012 Subaru wrx premium when installing this type blow off valve?
I had an 09 STI with one of these GFB BOVs on it and a Cobb intake. I had tuned it with the Cobb accessport and wasn't running a really aggressive map (just stage 1, low wastegate), but had ringland failure after about 15k miles. The Subaru dealer was cool and did a warranty repair on it, but really thought it was do to a rich mixture that the engine failed. As he said in the video, make sure you get a GOOD tune if you put one on.
Wouldn't the ecu cut fuel on lift off anyway or was that not how that car was tuned (I.e. tuned wrong).
I think it did, but just not quick enough, so it would get just a bit rich on lift. Like a lot of people said, Subaru's are really sensitive to MAF. I recently got a 2015 STI, and did basically the same tune, but minus the BOV. I'm 6k into it and a couple track days as well, so we'll see what happens.
I've a question about when the ecu cuts fuel when you close the throttle. Is it really cutting all fuel? How long have they been doing this? so on and so forth.
What would the correct ratio be for a 2021 Hyundai i30n premium DCT if I want to vent to atmosphere? Any recommendations? I just brought one of these BOVs
I have a turbo kia forte and I disconected the reserc tube amd pluged the intake, no problems at all. Most CAI come with BPV deletes for it anyways. All depends on the car and i love my kia
It's only metered air if the BOV is behind the MAF. On a SC compressor setup the MAF is usually behind the BOV which means you can vent to atmosphere and not impact fuel.
How would Mechanical fuel injection like K-jetronic react to the different bov/bpv's ?
So how do I figure out how hard or soft the BOV should be for my mazdaspeed3?
So bov can cause backfire, and loud whoosh sound? He talked me into it.
Can anyone recommend the correct/best ratio for a 2020 wrx sti?
Also how tigh should the spring load be?
Tia
Can you do a video on running mafless and what benefits it has.
what if you're not using the stock ecu and tuning your fuel using a wide band and MAP instead of monitoring air intake pre-turbo?
I'd imagine atmospheric would not be an issue.
I just got the twin turbo explorer sport-
Can I install a m.a.p sensor in place of m.a.f and then vent both b.o.v's?
Some VW 1.8 turbo and 2.7 biturbo has vacuum reservoir and N249 solenoid for DV to pert it at part throttle. If somebody want to swap to aftermarket blow-off without recirculation then must disconnect this vacuum system and connect it directly to intake manifold.
Do you have any installation vids on the tt legacy setup ?
Can confirm Turbo falcons can go full atmospheric Bov without issues
What I've always been told is that it might gunk up your first catalyser. That's it. The unburnt fuel will just gunk it up over a (very) lengthy period of time, after which you either change it or just cancel it lol. I prefer keeping them as I'm not a fan of smelly cars, and they are a few hundred bucks I beleive, but yeah if you go with a 50-50 valve... You should be fine. I had one on my '04 WRX, and even tho subarus are reputed to not liking BOVs too much, with th 50-50 one, I had it on the car for 3 years and everything was still perfectly good.
Newer into the car scene & just grabbed a GFB TMS for my WRX. 50/50 was my plan anyways based off of still having air recirculating and still getting the atmospheric venting “pssssh,” but after seeing your comment I feel a lot better about it, thanks for taking the time to leave your opinion 5 years ago LOL
Hi GF Brett, do these fit factory 1Jzgte engines? I seem to loose boost under load, and think it's the stock bov as I've been told they're trash.
What about blow-through MAF? In a blow through MAF should the BOV be closed at idle? And only open on shifts? I've got this setup on a centrifugal supercharger, so slightly different scenario than normal.... Since it wants to "make boost" at just about all rpm. Trying to figure out how to set this up.... It idles like garbage if I open the valve up at idle.
i had that on my evo 8 and i vented it about 50/50 i was tuned with gsc1 or gcs1 cams cant remember down pipe straight pipe cat back intake upper and lower inter cooler piping and the car ran fine with it my evo x is stock so i don't know how that bov would be on the x
Or you have a blow through setup, I like it in case I blow a pipe connection and will just be without boost and car will run fine with no issues on MAF.
Can you do a video on turbo surging as I hear many people do it but I also hear that it can damage the turbo
I think my blow off might be saving my clutch right now since im not constantly running boost on my Si with this +6 tune
What about relocating the MAF after the BOV? Would that be a better solution?
Depends on what monitor u have. MAP or MAF. MAP can be vented to atmosphere for not, MAF only can be recirc
if your bov was before your air sensors wouldn't it eliminate the rich problem? since it would be regulating the mixture according to the "true" air input.
How to set up the spring load right? I have a twin turbo Subaru ej208
The recirculating bov will actually push air backwards across the MAF depending on the boost pressure....thereby still creating a rich condition as the air is metered twice. This air pressure wave will also blow backwards through your air filter.
directly .. is there any risk whatsoever to the engine when installing a flush? for example, in a jetta 1.4 2016? Thank you
hm. My factory BPV functions decently as a BOV. I dont have room to add the snout to attach a hose, so it just vents to atmosphere. It doesnt vent during idle, it only vents under positive pressure. This creates a lot of woosh noise as it steadily leaks air at partial throttle but since my ECU is tuned with MAP only, it doesnt effect performance.
no mention of part throttle i.e on track cars mid corner, as i had overfuling issue on my mx5/miata turbo before i went with a stand alone MAP based ecu.
What about diverter valve spacers? Will they have idle problems sense they use the factory dv?
Speed density carries the day yet again!
yeah but what if we plumb it back into the exhaust manifold, just before the turbo? is that a defect?
How should my GFB blowoff valve be set to achieve a medium to loud whoosh sound? I have the T9014 model of blowoff valve.
Do you know about venting to atmosphere in Qld and how strict the law is etc
Thanks you solved my problem Brett Happy Easter My Doggy!!!!
yes thanks man gfb great bov too
I tried this on my 2016 expedition. She ran a little warm, the whistle sounded more like a rush and the boost maxed from 15 to 16 psi. Do with that what you will.
Surely to solve all issues and problems it would be best to use a map sensor over a maf as this would read the pressure in the manifold and the ecu would adjust the fuel accordingly??? if your modifying a car make it safe and do it right
I ran a vent to atmosphere BOV on a nearly stock Nissan SR20DET engine with a stock ECU and MAF for a long time,and absolutely never had any problems because of the BOV,whatsoever.
How old is that Dell laptop
So can I install a Bov to a 07 a4 b7 2.0t?? Its confusing some say no and some say yes it's okay any help or should i just stay with a gfb dv??
"I'm not here to debate that right now" well said Brett.