Stock BOV issues

by **GTSPECB STI** » Thu May 28, 2009 9:40 am

After all the mechanical mods and tune my stock BOV is really loud now and even worse in cool weather. It sounds like a bloody aftermarket venting to atmos BOV. I am tired of sounding like a ricer. Any suggestions on an aftermarket replacement that doesn't vent to atmos?

by **coyote** » Thu May 28, 2009 10:06 am

The only thing that will shut it up is going back to a 100% stock standard intake (including the filter).

by **GTSPECB STI** » Thu May 28, 2009 10:15 am

thats what I figured Tony! I guess more power comes a cost other than $$ sometimes.

by **tangcla** » Thu May 28, 2009 10:21 am

Just bite the bullet and get a full atmo bov

by **GTSPECB STI** » Thu May 28, 2009 10:29 am

thats just what I dont want Clarence, I may as well have one now with the stock bov.

by **tangcla** » Thu May 28, 2009 10:32 am

haha I know, I'm just stirrin.

You got pod filter?

by **GTSPECB STI** » Thu May 28, 2009 10:40 am

tangcla wrote:haha I know, I'm just stirrin.

You got pod filter?

Nope just resonator removed, HKS panel filter and zero sports maf pipe. Bigger tmic, 3"dump and pipes and hitechs.

by **tangcla** » Thu May 28, 2009 11:00 am

So which part was it that caused the most BOV noise back through the intake?

by **GTSPECB STI** » Thu May 28, 2009 11:04 am

my BOV noise is being generated when the BOV releases air when you back off the throttle. Its not coming from the intake but rather because of it and the fact that I there is way less backpressure and far more power being created as a result of the tune.

by **Arith** » Thu May 28, 2009 11:06 am

You should get a re-tune and go down to 10 or 12 psi of boost. That should take care of this pesky excessive air!

Sorry, just stirring up trouble like Clarence.

by **tangcla** » Thu May 28, 2009 11:08 am

GTSPECB STI wrote:my BOV noise is being generated when the BOV releases air when you back off the throttle. Its not coming from the intake but rather because of it and the fact that I there is way less backpressure and far more power being created as a result of the tune.

I know how the BOV generates noise

but I'm asking, which mod you did caused the most noise to come back through the intake system (as that is where the noise escapes the plumback system).

by **cpitts** » Thu May 28, 2009 11:14 am

GTSPECB STI wrote:...just resonator removed, HKS panel filter and zero sports maf pipe...

These items are your culprit.

The BOV is pumping air back into the intake pipe and the ZeroSport pipe, panel filter and little reso hole will let that air/noise flow easily out the front of the intake system.

Does the Zero Sport pipe go all the way from the turbo to the airbox or just the little bit from the end of the intake pipe to the AFM itself?

Sadly, any BOV you use that's a recirculating type will get the same result. And the cold weather thing is because you're building boost quicker (denser air) so you vent more pressure quicker.

by **coyote** » Thu May 28, 2009 11:19 am

Anything that impedes flow in one direction will also muffle noise in the other direction ... unfortunately.

by **GTSPECB STI** » Thu May 28, 2009 11:20 am

Just the end of the intake pipe to the AFM itself. Is anyone else suffering from this same issue once they have done similar mods. Dense air is great but ricer bov sounds are not.

by **cpitts** » Thu May 28, 2009 11:25 am

Yep, as you guys have probably seen, my airbox now looks like this:

And yes, I get spool and BOV noises, but certainly not offensive. This may change once the intake pipe and other components are done. :lol:

Stock BOV issues

Stock BOV issues

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