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Old 07-26-2005, 12:54 AM   #1
hauvis
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Join Date: Dec 2003
Location: Anaheim
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2000 Protege 90whp
White

Default At what PSI does the Stock STI blow off leak boost?

I am running 20psi in 4th gear with stock turbo.

I am wondering if my stock blow off valve could possible be leaking or even worse causing backpresussre and compressor surge.

The car is running fine to my knowledge but it never hurts to think about these things
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Old 07-26-2005, 09:26 AM   #2
dream
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Im running 25+ right now with the stock bov and no leaks.
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Old 07-26-2005, 12:54 PM   #3
InLoveWithBoost
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I personally like the BOV sound, why haven't you guys upgraded?
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Old 07-26-2005, 01:42 PM   #4
DISCOPOPE
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i'm at 20 with stocker.
i doubt i'm leaking.

when the new perrin one comes out i'll install it and let you know.

Quote:
Im running 25+ right now with the stock bov and no leaks.
boost whore.
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Old 07-26-2005, 01:48 PM   #5
fastwrx006
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wow I must have of got a bad stock BPV cause mine started to leak at 16 psi with my 20g. The Turbosmart dual port bov solved this issue for me.
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Old 07-26-2005, 01:53 PM   #6
DISCOPOPE
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Quote:
Originally Posted by fastwrx006
wow I must have of got a bad stock BPV cause mine started to leak at 16 psi with my 20g. The Turbosmart dual port bov solved this issue for me.
i've wondered how one determines if his/her bov is leaking...
how did you diaganose this?
not trying to be an ass at all, i'm genuinly interested..
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Old 07-26-2005, 02:15 PM   #7
fastwrx006
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Quote:
Originally Posted by DISCOPOPE
i've wondered how one determines if his/her bov is leaking...
how did you diaganose this?
not trying to be an ass at all, i'm genuinly interested..
When I went to get tuned with my 20g my turner could not even reach 300whp, he told me it would not boost more than 14 - 15 psi till redline. It just would not hold boost. I brought a turbosmart bov that day by chance, I told him about it so we gave it a shot. With the turbosmart bov on we were able to hit over 300whp and hold 18- 19 psi till redline(we could have run more boost but I wanted to run under 20 psi). So I guess it must have been leaking cause we could not hold much boost in any part of the rev range, with the turbosmart on it holds boost rock solid.
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Old 07-26-2005, 02:46 PM   #8
RiftsWRX
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Quote:
Originally Posted by dream
Im running 25+ right now with the stock bov and no leaks.
24.65 PSI, get it right biotch!

Jorge (RiftsWRX)
www.ProjectWRX.com
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Old 07-26-2005, 02:52 PM   #9
dream
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Quote:
Originally Posted by RiftsWRX
24.65 PSI, get it right biotch!

Jorge (RiftsWRX)
www.ProjectWRX.com
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Old 10-27-2005, 08:52 PM   #10
dudical26
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Does any one know how to determine if their BOV is leaking?
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Old 10-27-2005, 10:34 PM   #11
wgknestrick
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Pressurize the intake track with a home-made fitting (valve stem drilled into a plumbing cap that is pluged into your intake track). Put a vacuum gauge on the brake booster on the intake manifold to watch the PSIs as you use an air compressor to pres. the manifold to 20 psi. Soap down the BOV for leaks on the valve.

Bubbles, leaking. No bubbles, good.

Be careful of your face/eyes as some hoses could violently pop off at higer pressure.
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Old 10-28-2005, 08:57 AM   #12
x99percent
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My stock STi valve was leaking back into the turbo inlet at ~21-22psi. On the dyno, the charge pipe to the FMIC was *hot*. I switched to a modded valve, and that held the boost (noted by a colder charge pipe and higher whp)... but, on the road, it was usually slow to close after a gearshift.

I am now running a Forge recirculating valve with the next-to-strongest spring and two shims... will be switching to the strongest spring soon (had a couple of "slow to close" incidents).
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