This is a discussion on "The BIG BOV thread" (Where all bov question threads get merged) within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Originally Posted by wrxtreme06 yes. put your stock bypass valve back on Only true remedy......
Moderator for all public forums
ScoobyDMC #003 Blobeye Syndicate #10
2004 WRX Sedan PSM 5MT Tactrix Stage 2+ Blouch TD04 19T @ 21 psi
Mods & Pics
so an aftermarket BPV is the way to go? I'm going Stage 2 soon also. But if the factory valve is good to 20psi, why should I need an aftermarket BPV if Stage 2 is going to be around 17psi? Would a new stock valve be just as good?
Bugeye Mafia Member #177
New England F4
VF43'd by Wicked Innovation
Yes. You can get them relatively cheap (or even an even swap).Originally Posted by DVSWReX
If it doesn't support your boost level, then go aftermarket.
I am x-ing my fingers that with it I'll finally be able to hit 17psi on Stg1 tune. But either way I am going stg2 this or next week after I get my Borla catback... and if it turns out that the stock BPV is a piece of crap, then it will help with my stg1 and then stg2, and also when I get a new turbo setup hopefully before summer is over.
Does anyone know how the turbo xs hybrid bov works? any problems? thx
That is what I was going to suggest. According to the picture of your avatar, you have a 2002 and the valve might just be worn out. My WRX was equipped with a TD0518G 8cm^2 and was pushing 20psi on the stock valve. It held fine, but after selling the car and buying a STI, I noticed the much newer stock valve performed and sounded better. BTW my old WRX was Sedona Red tooWould a new stock valve be just as good?
Of course it works, but the VTA aspect of it will still cause some issues - however, it will not be as bad as a 100% VTA BOV
first, you have to disable LTFT. don't worry: the STFT will still work just fine to keep idle at stoich. (you'd also better have a well tuned open loop section, but that goes without saying.)
second you have to disable any injector cutoff delay. this adjusts how quickly the car will cut injector on time to zero during times when RPM > idle and TPS < idle. basically this occurs every time you lift off the throttle and shift.
with those two things in place the ecu will shut off the injectors during the vent to atmosphere... as long as you lift off the throttle completely (which is generally the case).
additionally the lack of LTFT will prevent any residual AFR errors caused by the VTA to accumulate over time.
if you can't wrap your head around every term and acronym i've used in this post, don't even think about trying to do this yourself.
ps. i use an oem bpv that has the "tms" pressure port relocation mod. tested perfect up to 27psig.
Last edited by ride5000; 07-15-2008 at 05:46 AM.
Some easy reading for those interested in how LTFT and STFT work together: Mixture and adaptation .
Torch Red 2002 Chevrolet Corvette Z06 46k mi.
Black 2002 Subaru Impreza WRX 6-speed 94k mi. my mod list
10/08/2006 - email@example.com (5-speed with well worn clutch, no launch)
"Six stars gleaming, five speeds breaking, four tires chirping, three differentials working, two liters screaming, one turbo boosting... it's what makes a Subaru all-wheel-drive, all we'll drive."
for Bugeye owners my BOV thread Service Manuals
iwas thinking of an hks ssq bov,and i found they make recirculating kits for them,do these actually work?
Some air will be recirculated, but not all of it. So your car will still not perform at 100%. Read up on BOV's.
2005 WRB WRX "was" STAGE 2
I've had good luck with my GFB (better than HKS).
It's a 50/50 recirc.
no negative effects whatsoever.
However, don't expect an improvement. They are essentially useless as anything other than a noisemaker. So long as you're aware of that, you know what you're getting into.
2006 Subaru WRX-Thread: http://www.clubwrx.net/forums/engine-modifications/165158-ninfourteeners-progress-thread-pics.html
1978 Subaru BRAT-Thread: http://www.clubwrx.net/forums/engine...ss-thread.html
2007 Subaru B9Tribeca Ltd (PSM)........1994 Subaru SVX LSi(SOLD)
WRX 12 sec drag (vs. late model Camaro SS):http://www.youtube.com/watch?v=lw0vWdD2cjU
WRX track racing (catching a stg.2 WRX): http://www.youtube.com/watch?v=mELeSD1Mi08