Turbo guys with mass air flow sensors
12-25-2010, 09:43 AM
#1
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Turbo guys with mass air flow sensors To the guys who are running turbo with maf, are ur bov's recirculated or are they dumped to the atmoshphere?
I read that if using a maf before the throttle bodie, u will need to recirculate the bov before the turbo becuz when the bov opens it causes the maf to tell the computer to command more fuel making the car run super rich.
If u guys do have a setup that is dumped, wut bov's r u all using?
I read that if using a maf before the throttle bodie, u will need to recirculate the bov before the turbo becuz when the bov opens it causes the maf to tell the computer to command more fuel making the car run super rich.
If u guys do have a setup that is dumped, wut bov's r u all using?
12-25-2010, 09:54 AM
#2
Got a ricer BOV, think it's a HKS SSQV, vented to atmosphere. It's after the intercooler but before the maf. I had to cut a coil out of the spring to get it to respond quick enough.
Yes you are correct, don't put it after the maf with a blow thru set-up.
Merry Christmas!
Yes you are correct, don't put it after the maf with a blow thru set-up.
Merry Christmas!
12-25-2010, 10:37 AM
#4
As long as the BOV is before the MAF, you can dump to atmosphere. After air goes through the MAF, the computer is adding the required fuel for that air. If the BOV is after the MAF and lets the air out after the MAF has already read it, the engine will not run correctly because it was "expecting" that air. In that case you would need to recirculate it so that the engine still receives the air it is expecting.
12-25-2010, 11:13 AM
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As long as the BOV is before the MAF, you can dump to atmosphere. After air goes through the MAF, the computer is adding the required fuel for that air. If the BOV is after the MAF and lets the air out after the MAF has already read it, the engine will not run correctly because it was "expecting" that air. In that case you would need to recirculate it so that the engine still receives the air it is expecting.
12-25-2010, 11:30 AM
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To the guys who are running turbo with maf, are ur bov's recirculated or are they dumped to the atmoshphere?
I read that if using a maf before the throttle bodie, u will need to recirculate the bov before the turbo becuz when the bov opens it causes the maf to tell the computer to command more fuel making the car run super rich.
If u guys do have a setup that is dumped, wut bov's r u all using?
I read that if using a maf before the throttle bodie, u will need to recirculate the bov before the turbo becuz when the bov opens it causes the maf to tell the computer to command more fuel making the car run super rich.
If u guys do have a setup that is dumped, wut bov's r u all using?
12-25-2010, 11:36 AM
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Don't confuse a By-Pass valve with a Blow Off valve. One vents to atmosphere, one recirculates.
A BOV should be placed before the MAF, a By-Pass valve goes after the MAF.
If you vent air after it's metered by the MAF you'll have issues.
A BOV should be placed before the MAF, a By-Pass valve goes after the MAF.
If you vent air after it's metered by the MAF you'll have issues.
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12-25-2010, 12:04 PM
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12-25-2010, 12:18 PM
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12-25-2010, 01:21 PM
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Thanx guys! I definitely got it now! I think that I'm gonna swap my billet bosch style bov from hp performance to an adjustable forged one. Its like 185 from extreme psi. My bov is mounted b4 my maf in a silicone T-hose. The one I have sounds crazy but I thinks that its causing my driveability problem.
It was opening up early at one point and I thought that I solved that problem but now I think that I hear it opening up again. Its probably just too cheep.
Is there any big name bov's that already have a bov flange mounted on some tubing that can be clamped to a silicone hose?
It was opening up early at one point and I thought that I solved that problem but now I think that I hear it opening up again. Its probably just too cheep.
Is there any big name bov's that already have a bov flange mounted on some tubing that can be clamped to a silicone hose?
12-25-2010, 02:26 PM
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12-26-2010, 12:22 PM
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Venting to atmosphere after the MAF will cause a few irritating problems, most are a bit more noticeable in a car with a standard trans, it's a common problem with DSM guys. Lot of newbs vent to make it sound cooler but then wonder why their **** dies when they come to a stop or stutters when they shift.
