I've ran into a few wrx owners who are telling me that an aftermarket atmospheric bov will/could thereotically make the car run bad but when actually installed their car runs just fine. I've been thinking about borrowing a friend's to test this theory out but decided to consult the experts first. Is the maf misreading due to the atmospheric venting specific to only wrx's die to design or does it apply to all maf equiped turbo vehicles? Anyone else running a atmos. bov without any problems? I know its a useless mod, blah, blah, blah, but out of pure curisoity I'd like to know of the positive theories out there.
hate to say it, but there are like 10 other threads on this already. Jsut search for BOV or blow off valve and there is a ton of info.
I have a atmosphere one on my EJ22T....w/ WRX TMIC. It DID die when I first put it on, but I later adjusted the BOV spring so it'd shut at the right time so it does stay open when the RPMs drop back down to idle speed. The only effects of it is the sound. If you happen to be boosting MONSTEROUS power w/ some GT30R+ then one would be nice. The down side from what I could tell is some of that turbo flutter stuff. Because when I brake boost and I left off the gas a little and only enough to where the BOV doens't vent, the my turbo makes this flutter noise. When I DO let off the throttle completely it will vent. The flutter is cool, but is bad at the same time for the turbo. At least it's what I'm thinking what's happening, unless it's just the wastegate, what I doubt. but yes, reason for a BOV instead of the BPV is because I couldn't run the BPV on my setup.
that "flutter" is the intake charge slamming against the compressor wheel, probably not good for the turbo.:ugh:
I'm running an atmosph. HKS BOV with Stage 1 at 14Psi and things are running just fine. Don't have any kind of problems at all. Been running like this for 3 months now. Everything seems fine for me.
I have had my HKS SSQ on for over a year with no problems. I have never heard this "flutter" noise, which is fine with me. It does make your car run a little richer though. BTW I only put it on becuase it was left over from my Supra when I sold it.
Even if you think it's running fine, it's not (with a non recirc). It will at the very least be running rich between shifts. The ECU is expecting a BPV to be there.
Ding ding ding.... we have a winner, sorry. Yes this is what will happen. Everything I have read says most people will not notice. I have a half and half and do not notice. I am also running upwards of 21psi and might be upgrading turbos this fall or next spring so my situation is a little different. I am getting all the parts ready to go.
if you have any cats in your exhaust they will get ruined quick due to the excess gas igniting after a shift
18-20psi. Mine leaked around the 20psi mark, but some of the other cars I have tuned have been as low as 18. As for the rich after shift thing. There are ALOT of variables that goes into that statement. It really boils down to the person driving. The way the cu works is, after you let off of the gas, the ecu cuts the injectors. So, if you let off of the gas BEFORE you step on the clutch, you will not see to much stumbling. Now if you are stepping on the clutch while or before you let off of the gas, the rich condition becomes more of a problem. That is why some people do not notice the 100% atmo bov. kinda like the popping in the exhaust when you shift, it really doesn't happen because of a overly rich condition, it happens because of a nicely timed lean condition. Russ
