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SVTPerformance's Chain of Restaurants
The Blower Bistro
BOV or BPV ?
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<blockquote data-quote="CobraMac" data-source="post: 10383234" data-attributes="member: 50240"><p>I don't understand what you are saying, because you have things mixed up and confused...the blow off valve and bypass valve do the same thing. When the throttle is closed there is vacuum...when there is vacuum the bypass or blow off valve is open and allowing air to escape. This means when you are not pressing on the gas at idle, the bov and bpv is open, and in between shifts they are open. </p><p></p><p>The difference in the two is that the the bpv recirculates the air back into the intake track and the bov vents it to the atmosphere. Most cars that have sensitive air meters use bpv's.</p><p></p><p>So you have it backwards almost...bovs AND bpvs are almost always OPEN unless the throttle is pressed down. You can get compressor surge on both turbo and centrifugal supercharger applications. And compressor surge isn't that big of a problem with causing a rich condition...the problem is the throttle body is completely shut so and that compressed air has nowhere to go but back at the turbine which is spinning at an incredibly fast speed.</p></blockquote><p></p>
[QUOTE="CobraMac, post: 10383234, member: 50240"] I don't understand what you are saying, because you have things mixed up and confused...the blow off valve and bypass valve do the same thing. When the throttle is closed there is vacuum...when there is vacuum the bypass or blow off valve is open and allowing air to escape. This means when you are not pressing on the gas at idle, the bov and bpv is open, and in between shifts they are open. The difference in the two is that the the bpv recirculates the air back into the intake track and the bov vents it to the atmosphere. Most cars that have sensitive air meters use bpv's. So you have it backwards almost...bovs AND bpvs are almost always OPEN unless the throttle is pressed down. You can get compressor surge on both turbo and centrifugal supercharger applications. And compressor surge isn't that big of a problem with causing a rich condition...the problem is the throttle body is completely shut so and that compressed air has nowhere to go but back at the turbine which is spinning at an incredibly fast speed. [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Blower Bistro
BOV or BPV ?
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