BOV/BPV Thread

[MSMS3]

Originally Posted by Jaysspeeed3 so I've been doing so much research on building my mazdaspeed 3 safely. i want some nice gains but i don't want to run into any issues. motor mounts, transmission mount already bought. cobb sri, cobb tip, corksport fuel injector seals. nothing has been mounted on yet. gov has been my next approach including cobb ap. great write up on this thread. been thinking of the his bov. but as you were writing about bov's with maf. bov has to be mounted 12'' from the throttle plate and maf 6'' from bov. my question is are there any additional parts id need to make the install with those specs. or should i get rid of the maf. thanks in advance. I'm still new to this site. jay

You read this entire thread? You didn't figure out that you do not want to fuck with your MAF location or learn that the boost diverter valve needs to be in recirc mode for your ECU to meter air properly on our cars? You should have figured out that long ago we learned that the best valve for our cars up to at least 20 psi of boost (well beyond the stock turbo) is the excellent OEM BPV already on your car.

Unless it is leaking, stick with stock BPV. And don't waste your money on noise makers that do not give you any more power, but can cause your engine to idle poorly and misfire when shifting. BOVs are for highly modified engines with much larger aftermarket turbos, manifolds, and for special tuning designed from the ground up to work in tandem with BOVs. They do nothing beneficial for the kind of mods you are describing, beyond shout "ricer." You are not driving a Honda.

My Christmas gift to you is for you to save your money for mods that actually make power. A BOV will not.

[g00s3y]

Originally Posted by Jaysspeeed3 so I've been doing so much research on building my mazdaspeed 3 safely. i want some nice gains but i don't want to run into any issues. motor mounts, transmission mount already bought. cobb sri, cobb tip, corksport fuel injector seals. nothing has been mounted on yet. gov has been my next approach including cobb ap. great write up on this thread. been thinking of the his bov. but as you were writing about bov's with maf. bov has to be mounted 12'' from the throttle plate and maf 6'' from bov. my question is are there any additional parts id need to make the install with those specs. or should i get rid of the maf. thanks in advance. I'm still new to this site. jay

Are your stock seals leaking? If not, there is no need to replace them.

Why do you need to replace your bpv? Because you want your car to make ricer sounds? If you haven't even started modding, there is no need to replace your stock valve unless it is not functioning properly.

And you clearly haven't read much if you are asking about having to move the location of the BPV. Not to mention, you say nothing about getting HPFP internals, which are the first thing that should be on your list of parts to buy.

[Jaysspeeed3]

Firstly you don't need to make me sound like a brainless goon. I'm asking about this. Not saying I'm moving ahead with it. I ask because I don't know. Also I said nothing about getting a bov for the sound. I could care less for the noise. I thought it would help with throttle response and boost lags. Obveously it's not worth it. Secondly I just started doing research oh hpfp. This site isn't the easiest to figure out and I don't have the time to spend hours every day as I have a busy work life. I'm doing the best I can. And I don't plan to install anything till I know exactly what the outcome will be. Be positive and a little less harsh. Thought this was a good communitie.

[Tifosi42]

Off topic from this thread but, Cobb Accessport, Autotech HPFP internals, RMM to get you started. Make sure you really want to use a stock size intake, if you upgrade the turbo later you'll regret it, ask me how I know. Buy once, save money. Our sponsored forum vendors are fantastic. Also do yourself a favor and get an OTS tune from Freektune or Stratified, money well spent. My present to you, Merry Christmas!

[frothy]

Originally Posted by Jaysspeeed3 I said nothing about getting a bov for the sound. I could care less for the noise.

Our cars come equipped with bypass valves (BPV) -- the air that's vented is re-circulated into the intake system. A blow-off valve (BOV) vents the pressurized air to the atmosphere. The ONLY reason for purchasing a BOV over a BPV is exactly for the noise. If you're going to throw the term BOV around, by default it's assumed you're doing so for the sounds, because there's definitely no performance gain.

As for the seals... You have a stock car. The mods you're throwing at the car have minimal impact on power. So why are you buying CS seals? Save your money unless they're leaking...

Understand that EVERY response that you've received so far was done with good intent.

These folks are trying to prevent you from throwing your hard-earned money at needless mods and directing you towards the ones you DO need (HPFP) to operate safely. No need to get upset.

[MD1032]

Also, there's no requirement that the BPV be mounted 6" from the throttle body. You can mount it anywhere between the turbo outlet and the throttle body and it'll do its job. Just a question of running the air return piping back to the intake from wherever you mount it.

[TheSixthSpeed]

Originally Posted by MSMS3 You read this entire thread? You didn't figure out that you do not want to fuck with your MAF location or learn that the boost diverter valve needs to be in recirc mode for your ECU to meter air properly on our cars? You should have figured out that long ago we learned that the best valve for our cars up to at least 20 psi of boost (well beyond the stock turbo) is the excellent OEM BPV already on your car. Unless it is leaking, stick with stock BPV. And don't waste your money on noise makers that do not give you any more power, but can cause your engine to idle poorly and misfire when shifting. BOVs are for highly modified engines with much larger aftermarket turbos, manifolds, and for special tuning designed from the ground up to work in tandem with BOVs. They do nothing beneficial for the kind of mods you are describing, beyond shout "ricer." You are not driving a Honda. My Christmas gift to you is for you to save your money for mods that actually make power. A BOV will not.

The bad idle with a BOV is caused by the adjustable ones. They have a screw that lets you adjust it to the point of leaking. If you set it too far from the leak point, the BOV won't work very well and you'll get compressor surge.

I don't think the car will misfire with a BOV. You will run very rich when the BOV vents which can cause your engine to drown in fuel which in turn shuts it down or you could also get afterfire(not to be confused with backfire), which is a flame or loud pop coming out your exhaust due to all the unburnt fuel.

What the OP... -well not really, -but the guy who is being attacked because BOV, should do is remove and plug the recic hose on the stock BPV, and then see how the car runs. You will have turned the stock BPV into a BOV so to speak. Just make sure the re-circulation hose is plugged well or you will have on hell of a leak that will run you lean and cause your engine to blow!

^ Yes this is stupid, but it's worth testing for those who want to see what the difference is.

[MSMS3]

Originally Posted by Tifosi42 Off topic from this thread but, Cobb Accessport, Autotech HPFP internals, RMM to get you started. Make sure you really want to use a stock size intake, if you upgrade the turbo later you'll regret it, ask me how I know. Buy once, save money. Our sponsored forum vendors are fantastic. Also do yourself a favor and get an OTS tune from Freektune or Stratified, money well spent. My present to you, Merry Christmas!

This is the classic, proven way to begin. OP would be wise to follow this advice. I'd add a good cold air intake or short ram intake to that list. With a good tune he will pretty much max out the K04 turbo on pump gas. Add a race pipe in place of the second cat, and he's then maxed out for sure with a proper tune.

The high pressure fuel pump internal upgrade is absolutely essential. Without that, increased boost and increased air flow or exhaust side flow = zoom, zoom, boom on our engines, as the stock pump is marginal to begin with.

[KooshaS]

Is the cobb bpv worth it? Thinking of that being my next mod

[Db09ms3]

Originally Posted by KooshaS Is the cobb bpv worth it? Thinking of that being my next mod

Just google that shit son.

[El Diablo's Master]

Can I install a BOV while running the COBB stage 2 tune? Just checking because I'd rather not damage my engine, turbo, etc.

[TheSixthSpeed]

Originally Posted by El Diablo's Master Can I install a BOV while running the COBB stage 2 tune? Just checking because I'd rather not damage my engine, turbo, etc.

Shouldn't make a difference as long as it is recirculating. If you have the hose to the Turbo Inlet Pipe disconnected(and blocked off hopefully), then you are Venting To Atmosphere and will run rich every time you let off the gas. I think a tune can help make it not so bad or fit it, not sure, by leaning out the AFR after letting off the gas, not really sure how to tune that in. I recommend you recirculate.

[faeker]

Originally Posted by El Diablo's Master Can I install a BOV while running the COBB stage 2 tune? Just checking because I'd rather not damage my engine, turbo, etc.

Its moments like these i miss.



*ahem*



Blue spring 2 shims.

Sent from my SM-G950U using Tapatalk

[MSMS3]

Originally Posted by El Diablo's Master Can I install a BOV while running the COBB stage 2 tune? Just checking because I'd rather not damage my engine, turbo, etc.

Almost a year old dead thread revived rather than simply reading it and following advice already given.

Dead thread and multiple prior answers notwithstanding, why in the world would you want an aftermarket BOV at all? Is there anything wrong with your stock valve?

[allservice]

Originally Posted by MSMS3 Almost a year old dead thread revived rather than simply reading it and following advice already given. Dead thread and multiple prior answers notwithstanding, why in the world would you want an aftermarket BOV at all? Is there anything wrong with your stock valve?

Fuck off, moron. BEat it

[Vansquish]

Originally Posted by allservice Fuck off, moron. BEat it

Chill out, dudebro. You're not as cool as you think you are.