I have heard they make the car stall, etc.. Do all of them do this? Is there an easy fix for this problem? Apexi says their S AFC II can correct for this. Anyone had any experience?
I know I don't need an aftermarket BOV, I just like the sound.
So the reason it hurts performance is because air that has already been measured is leaving the system? I tried plugging the intake at work ( I work on turbodiesels and we were bored) and venting the BPV to the atmosphere. It sounded awesome but made the car stall! Would an aftermarket BOV do the EXACT same thing?
The OEM valvem when it is recirculated back into the system (like it should be) makes almoss no noise.
I would not recommend venting the OEM valve unless you have a VPC or an aftermarket engine management system.
What you want in a valve from a performance stand point:
1. Fast response (open and close)
2. Equal response level at any boost level
3. As long as you have the AFM ( air flow meter), you want a valve that recirculates
Most aftermarket valves are based on a spring which does not meet the first 2 goals.
The OEM valve and one of the HKS valves are based on air pressure differentials so they respond incredibly fast and exactly the same regardless of boost levels.
oh oh oh oh...and also...i don't like PSHHHHHH! as much as the BOV that sound like a LASER. If u guys know what im talkin about. the laser sounding ones are freakin cool!
I've had a TurboXS BOV on my 2 for over a year now. I like sound, but I have to agree there is a drop in performance. not a great one but noticable. and the occassional backfire from the momentary rich mix between gears. I have been thinking about going back the the OEM BPV but I can't bring myself to get rid of the sound..I don't go to the track so it hasn't been a major issue with me.. dunno
Maybe this is a stupid question, but what would happen if you placed the MAF after the turbo and BOV? Wouldn't that keep it from being an issue at all?
I'm no expert but I think if the AFM was after the turbo it would get an incorrect reading. it would be measuring hot compressed air at a higher velocity.the BOV is already after the turbo as it should be.
My friends WRX has the baddest sounding bov ever.(imo) Super loud and waaaay high pitched chirp, not the hiss. It is sweet.
I'm trying to imagine what that sounds like . The only BOV I've heard is my own. no one in my town is using one. I think there are only 2 other turbo's at all here.a Dodge STR4 and a Volkswagon beetle....hhhmmm
The MAF measures air flow before the turbo, so the air is moving faster than it is after the turbo (because the air is being compressed). The measurements would be completely different and end up messing up your cars performance more than the aftermarket BOV would.
Unless of course you had it tuned via an aftermarket engine management system (which would negate the relocation of said MAF anyways).
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