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Old 04-02-2004, 05:37 PM   #1
Derk1127
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Join Date: Aug 2001
Chapter/Region: NWIC
Location: Seattle, WA
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2000 Impreza RS-T
BRP w/Hydra+EJ257

Default Recirculating BOV

How many of you are running a recirculating BOV? Im using a blitz DD right now and Im wondering if the recirculating BOV's like the greddy and others can help me reduce turbo lag. im doubtful since im running only 6.6 psi that it would help much but i was wondering what are your guys' opinions?
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Old 04-02-2004, 06:59 PM   #2
Andursun0013
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i'm running a recirc. BOV but thats pretty much only because I have a MAF and it wouldn't run/idle right without a recirc. BOV


Kyle
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Old 04-02-2004, 07:13 PM   #3
Mancini
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The only reason the recirc might help is that it's open at idle/part throttle, which could help some of the intake bypass the turbo. Probably not enough to be noticable though. Unless the recirc BOV opens at idle (like a stock WRX or 1G DSM BOV) it would have no effect on a MAP based car. I ran with both recirc and atmospheric BOV's on my 98RS-T and the only difference I noticed was in drivability with the MAF sensor, no noticable difference in spool-up.

Brian
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Old 04-02-2004, 10:18 PM   #4
Unsung Boxer
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Yeah, i had a WRX BOV venting to ATM, the car wouldnt idle with it. People dont realize the real problem with this is vacuum leak, not the venting to ATM part.

If you are using a stock BOV, it is prone to leak at idle and low RPMs. This results in a vacuum leak, which will cause a lean condition, ultimately causing lean misfires and poor idle. You can fix this by crushing the BOV, or buying a stiffer aftermarket one.

I am running 12PSI, on a 98MAF based ECU, venting to ATM w/ a TurboXS BOV, and no problems.

-Jake
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Old 04-02-2004, 10:46 PM   #5
Mancini
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^ Right on! Just keep in mind the reason behind it staying open is to aid in spool up and response when the BOV releases at light throttle, or at least that's what I've always been told
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Old 04-03-2004, 05:08 AM   #6
Unsung Boxer
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spool and response has nothing to do with it, it is to reduce surge to the turbo compressor... I suppose if the valve is partially open, it might allow the turbo to spin for a millisecond longer, but once you open the throttle blade the turbo will hit full boost immediatly anyways...

If it makes a difference, I would like to hear the theory why.

-Jake
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Old 04-03-2004, 08:09 PM   #7
Mancini
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Well the theory is that it allows an unrestricted intake path to let air bypass the turbo, which "could" help get the motor spinning faster before the boost threshold. But like I said above if there is any benefit it was not significant enough for me to notice. By "response" I meant BOV response in light throttle release. Like you said above the recirc definately helps reduce surge. That's cause the response of the open recirc bov is much faster since it's already partially open at light throttle. Just thought I'd clarify what I meant.

Brian
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