BOV Flutter
Mar 12, 2015 | 12:36 PM
#11
No because there is always positive pressure in the intake pipe with the turbo spinning. So there will be a light flow of air out of the BOV at idle be cause the turbo is pushing a small amount of air at a closed throttle blade. As soon as the throttle blade is cracked, there isn't enough vac to hold the BOV open anymore and it closes, there for no unfiltered air can enter the air way.
A small amount flutter is perfectly acceptable with a turbo. A BOV is opened by vac when the throttle is closed and there is excess of pressure in the intake tubing before the throttle blade. Once enough pressure is relived, the valve usually closes. Sometime the spring is just a little too stiff, so you get a little flutter as some low pressure excess air is pushed back though a spinning turbo. This can also happen if you don't take you foot all they way off the throttle and hold the throttle blade open just a tad. There isn't sufficient vac to hold the BOV open to relive the excess pressure.
A small amount flutter is perfectly acceptable with a turbo. A BOV is opened by vac when the throttle is closed and there is excess of pressure in the intake tubing before the throttle blade. Once enough pressure is relived, the valve usually closes. Sometime the spring is just a little too stiff, so you get a little flutter as some low pressure excess air is pushed back though a spinning turbo. This can also happen if you don't take you foot all they way off the throttle and hold the throttle blade open just a tad. There isn't sufficient vac to hold the BOV open to relive the excess pressure.
Mar 12, 2015 | 01:21 PM
#12
No because there is always positive pressure in the intake pipe with the turbo spinning. So there will be a light flow of air out of the BOV at idle be cause the turbo is pushing a small amount of air at a closed throttle blade. As soon as the throttle blade is cracked, there isn't enough vac to hold the BOV open anymore and it closes, there for no unfiltered air can enter the air way.
A small amount flutter is perfectly acceptable with a turbo. A BOV is opened by vac when the throttle is closed and there is excess of pressure in the intake tubing before the throttle blade. Once enough pressure is relived, the valve usually closes. Sometime the spring is just a little too stiff, so you get a little flutter as some low pressure excess air is pushed back though a spinning turbo. This can also happen if you don't take you foot all they way off the throttle and hold the throttle blade open just a tad. There isn't sufficient vac to hold the BOV open to relive the excess pressure.
A small amount flutter is perfectly acceptable with a turbo. A BOV is opened by vac when the throttle is closed and there is excess of pressure in the intake tubing before the throttle blade. Once enough pressure is relived, the valve usually closes. Sometime the spring is just a little too stiff, so you get a little flutter as some low pressure excess air is pushed back though a spinning turbo. This can also happen if you don't take you foot all they way off the throttle and hold the throttle blade open just a tad. There isn't sufficient vac to hold the BOV open to relive the excess pressure.
Mar 12, 2015 | 02:12 PM
#13
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TECH Apprentice
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From: Mooresville NC
So I am pulling about -16.5 INHG according to my boost gauge with the vehicle in park and about -14.5 INHG with the vehicle in drive. I believe the spring in my BOV is a -18INHG. Should I go to a lighter spring?
Mar 12, 2015 | 02:47 PM
#14
I think it's personal preference. On my truck, I have a little bit stiffer spring so I have a little flutter, but I never worry about it. Either way, it shouldn't hurt anything.
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