WTF? leave the guy alone. If he wants a BOV then let him get one. I think the experience of your car running like sh*t and a sh*tty idle should be experienced by all. This way he can appreciate how a "minor mod" can really f*ck your car up if you dont have the proper associated equipment(i.e. good tune, ect. You know: Giant turbo-stock injectors, FMIC-stock turbo, all of the above with no EM or reflash.)

 

i like how quick you guys are to rip on someone for being young and not having credit......... so what if homie has a cool dad thatll get his boy the car he wants.... maybe he works hard and deserves it you ever thought of that??? although i do think the boys lucky he gets to drive an sti to high school!! dont hate congratulate!!!! just pray that he doesnt drive like a dumb high school kid lol!!

 

WORD!!!!! i think he should run that bov i bought from mike then maybe hell realize he doesnt want or need for that matter a bov!!!

 

07 sti?? make sure you read this....

http://www.cobbtuning.com/info/?ID=3476

 

i wouldn't read or trust anything from COBB tuning anymore...BUT i am familiar with that problem. I believe 04-05 rp should work?

*****

i agree with Warren and Josh...there is nothing wrong with a BOV. And let the guy do what he wants.

To the OP...read up on NASIOC. There is a ton of traffic on there be careful though...they're viscious. LOL

 

yeah i gotta say that this post has SOME validity... you will get boost creep when running a catless downpipe but the upside to that is your not running an aftermarket turbo capable of over 20-22 lbs of boost i think your running probably 17lbs at the most right now and that is more than safe youll be ok with running a catless downpipe and exhaust system for a while but you will find that if you run a bov your car will run like sh@t untill you install an ems (engine management system) and as soon as you do that it wont matter if you run catless or not cause then youll be able to help your computer learn what you have installed and have it run accordingly especially if you change out your vacuum lines and have the bigger pill so.......turboxs turbo back exhaust my friend and an access port are in your near future i think....

 

point taken on the exhaust BUT:

there is no way someone can say that the BOV alone causes a car to run rich. well i have a little point to make here and id like to hear some of your input. when the throttle is closed during a shift or just letting off in gear, the vent-to-atmo bov will vent or blow-off. many of you state that a rich condition is caused. well i would beg to differ. did you know that when the throttle is closed on a stock subaru ecu, the ecu also completely cuts fuel flowing from the injectors? how can a rich condition possibly be reached if there is no fuel being injected? the afr will spike up to 19.9 or LEAN on every shift, aka no fuel at all. also, even if the bov WERE to cause a rich or lean condition on shift or de-cel, it would have no negative consequence imo because the engine is under no load in this condition, and during a shift, the time it would be rich or lean, is only a few hundred milliseconds, until the clutch is engaged and the throttle pressed again. so i can see no detrimental effect on engine reliability. there are many out there with wrxs and maf setups running a vent-to-atmo bov for over 100k miles with absolutely no problems. id like to see some evidence that a vent-to-atmo bov on a maf metered car causes a performance detriment or reliability problems. if throttle tip-in is tuned correctly, any rich or lean condition would be ceased as soon as the throttle is changed from a closed position. it that is irrelevant because fuel is cut completely when the throttle is closed.

I'm open to constructive criticism on this topic so if you have a correction on what i said...help me out.

 

no critisizm but..... come drive my car with the stock bypass then ill put on the bov and you can tell me weather or not there is a performance difference.....whatever the cause may be my car idles crappy and runs extremely rich with an atmospheric bov its sonds cool as hell but makes MY car run like crap........probably cause i have a no cat turbo back exhaust and no engine management..????

 

i will account for the crappy idle...there is no way better EM or a way a tuner can tune for a BOV.

Fuel metering is upset by the atmo-bov ^^^ causing a crappy idle. But in those mili-seconds of temporary "RICH" condition if you will, the turbo isn't working any harder. The turbo does not have to "work harder" to pressurize the intake air. If you were talking about that kind of performance.

 

I have an HKS bov on my car and you can call me a dumb a-s if you want......it won't hurt my feelings. I think it sounds cool, and I think almost all of us at one point in time has run one, whether they want to admit it or not. My car actually idles pretty well with the HKS. I did try out an AVO bov once (and ran it atmposherically), and it idled like complete hell! The idle was screwed up, and the car even died out on me. I barely made it home (10 minutes) away, and immediately took it off. Ultimately, recirculated or at least 50/50 is the best, but it's your car and have fun with it.

 

i completely agree and on that note...my idle is fine with my greddy BOV.
Some BOV require too much tweaking to work properly, resulting in the car runnin like sh**. HKS does the job for most subies.

 

I got some data logs from a while back that shows this condition on my car. I also personnaly saw Ryan at Vakamon replace a stock bypass valve with a HKS SSQV on a BONE STOCK 06 STI and the thing ran like SH*T! It idled like sh*t and sputtered on anything that wasnt full throttle. Ok so we thought bad BOV, switched the BOV with a different SSQV, same thing. Put the stock valve back in and the car ran great. Then we put the new HKS SSQV on my car (which is tuned for it) to check the valve. It worked fine.

Im not sure why it happens and neither was ryan at the time.

As far as the stock ecu cutting fuel, I dont know about that either way. Is that on the older wrx's, the drive by wire ecu's or both?

 

fyi: i'm not a fan of the HKS b/c i had to much problems with them. i'm on my third on and i'm ordering my tial one here shortly. sucks tho i have to cut off the hks flange and re weld the tial one on

 

As far as i know it is for a SUBARU, but i'm looking into it more...but when you say "condition" do you meaning leaning out or becoming more rich in between? Some BOV just straight up suck. That's really strange with what happened. Also, Did you run a crushed BPV or the JDM STi BPV and get results with the rotated mount? Or were you 100% all the time with the gt?