Souund of a blow off valve...

RacEoHolic330 said:

Well, a lot of people are going to tell you that you need a blow-thru MAF meter to use a blow off valve, which is partially true. I have a greddy type RS bov that is vented to the atmosphere and im using a draw-thru maf. I have no driveability issues at all. When I shift the car goes rich for a fraction of a second and then its back to normal. It also goes rich when i downshift, but there are no stalling problems. The sound is soo amazing. It doesn't sound like those gay high pitch bov's on honda's. I swear, they sound like a baby is sneazing or something. Mine sounds like a loud swoosh of air. I've had people try to mess with me on the highway and when i rev my engine and they hear the BOV, they seem to have lost their want to race.

You just have to adjust the bov properly so it doesn't open up too easily and cause surging. UnderpressureGT has the same setup as me and he has no problems either.

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LukeDaddy said:

What happens when you use a BOV that vents to the atmosphere with a draw through setup, is you are releasing air that has already been metered, and there has been fuel injected to account for this metered air... Hence what you are doing is causeing a rich condition every time the valve releases air... there are two ways of doing this...

You can use a valve that diverts the metered air back to the intake tract after the MAF... or you can use a blow through meter, and place the valve before the MAF...


Some ECUs have a function where you can tune this condition out between shifts.. but for the cheap way, do it one of the two ways I listed...


Luke

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