Is it safe to vent your Blow Off Valve to atmosphere? [GO FAST BRETT]
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- Опубліковано 6 лют 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.
This series is proudly brought to you by Mighty Car Mods and GFB
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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?
@@Cheezel909 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
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.
Thank you Go Fast Brett!! Always a delight to devour your knowledge!!
This was the most informative video I’ve ever watched on UA-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
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.
Good information and friendly as always. Thank you, Mr. Brett :)
so happy this show is still going I love the GFB series so informative!
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 !!
Venting to atmosphere sounds so much better though
I love the nerdery of this series. It's so good.
This guy is amazing, very good information and explained well, thanks for the wisdom mate, appreciate it!
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
This was great and very informative, thanks Brett and GFB!
Go fast brett, shutting down forum know it alls.
Love it.
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.
Great video. Very intelligent, and excellent message delivery. Subed, hope to see more.
Thank you for clearing this up with actual knowledge
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.
This guys explains it nicely. Thanks Brett.
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
Thanks for this info! Very Helpfull!
Best explanation video around!
Awesomely explained.
Thanks Brett. 👍
Great video and topic.
Awesome explanation!!thank you!!
missed this so much
Thank you for talking sense!
Fantastic video, thank you :)
Thanks you solved my problem Brett Happy Easter My Doggy!!!!
wow thank you for this video, super helpful
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.
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?
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
So an adjustable blow off valve apparantly allows to tune how many flames you shoot out? I love it
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.
"I'm not here to debate that right now" well said Brett.
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 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.
Speed density carries the day yet again!
Does Go Fast Brett have a business name?Another excellent video from Brett.
Hey Brett, Thankyou for your well informed snippets, I enjoy watching your educated blogs, (and the MCM Legends) but dude....... Iron your new T shirts when in front of half a million subscribers ! Lmao :)
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
Can confirm Turbo falcons can go full atmospheric Bov without issues
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
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?
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.
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.
I like Brett. Subbed.
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.
Brett. You mentioned a MAF sensor set up but didn't mention a MAP sensor set up. Is there a difference?
You can still get a nice Whoosh sound from a bypass valve if you have a pod filter attached to the intake of the car, especially if you've replaced the factory rubber inlet pipe with a metal one. My 1.8t a4 makes a nice audible bov sound and it's fully recirculated.
+1 this. I have a K&N panel filter in a CDTi airbox on my Z20LET in my Astra, with a TurboSmart reciculating valve, and it is clearly audible. Not as loud as if I were to use a pod filter though, and definitely not as loud as a vent to atmoshpere bov.
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.
Brett! You forgot about part throttle lifting on AFM cars under boost!
time to run a bov venting to atmosphere on my draw through carby setup.
at the end of each go fast brett video he should tell us what he uses on his car or at least what he recommends we use on ours
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
yes thanks man gfb great bov too
Can you do a video on running mafless and what benefits it has.
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
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 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.
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...
How would Mechanical fuel injection like K-jetronic react to the different bov/bpv's ?
FYI This entire topic/video pertains only to EFI and excludes carbureted vehicles. In fact when you run a BOV on a blow through carburetor this allows you to jet the primaries down which helps with fuel consumption. Even at 6 PSI still run a BOV.
Great job. Thank you
love my gfb respons
Depends on what monitor u have. MAP or MAF. MAP can be vented to atmosphere for not, MAF only can be recirc
I use a 50-50 system on my Focus ST and I love it
Great episode. Would have been nice to mention MAP cars and put that one to bed.
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....
We've tried many BOV on a Mitsubishi Evo, the best performing one is actually the factory one. It leaks just enough air so you don't get compressor surge, and you can tune it so the recirculated air with some negative ignition timing will give you mega pops and bangs from the exhaust, as in blows the exhaust gaskets to pieces lol. sounds better than a BOV any day
My exhaust gaskets have to be changed literally every 6 months on my evo 😂
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.
Yaaaa I don’t get the obsession for the BOV sound. I be about that EWG life though
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?
So bov can cause backfire, and loud whoosh sound? He talked me into it.
I think he is talking about a specific car manufacturer. Fords along with every other car company that I have seen under the hood have a mass air flow meter after the airbox, NOT before it. I took the recirculation hose off of my 2022 Ford Bronco 5 months ago without issue.
If car has MAF sensor yes, its should lead to momentary rich condition and rpm spike and cat clogging. But if you have a MAP sensor, it doesnt matter. Also if you drive your car hard often enough you can usually get the CAt hot enough to burn off deposits
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?
What about relocating the MAF after the BOV? Would that be a better solution?
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
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.
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.
You can move the MAF to the pressure side of the turbo after the BOV.
Anton Larsson 🤦♂️
Don’t do that please
Hey @gfbvideos I would love to see a simple machined block off plate for the OEM GD STI intercooler. Or just an added plug that fit's your adapter plate so I can plug off the OEM BOV location. Can't seem to find anyone that makes one online.
How to set up the spring load right? I have a twin turbo Subaru ej208
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.
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 :(
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
yeah but what if we plumb it back into the exhaust manifold, just before the turbo? is that a defect?
Just get a the duel port turbo smart bov it’s recirculating and vent to atmosphere so it’s best if both world and you can adjust the spring pressure
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.
so i was wondering a turbo stops spooling when the wastegate opens but what if there was no wastegate in the turbine but there would be one in the pump side when the car needs boost its always there because the turbine is always spooled
What about diverter valve spacers? Will they have idle problems sense they use the factory dv?
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?