Quote:
Originally posted by BuudWeizErr
Honestly, what percentage of the population that runs a front mount actually uses the stock recirculating valve?
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That would be the percentage of the population that likes to keep performance. If you're using a lambda probe, then you're fine with an atmosphere vented blow-off valve. If (like in a 240SX) you're using a Mass Air Flow sensor then an atmosphere vented valve will hurt your performance. When you let off the throttle (to shift for example) the ECU doesn't know that you just vented out some air.. air which it already calculated into the a/f ratio. Now you don't have all the air the ECU thinks you do so you run rich. The ECU sees this and starts to lean out the a/f ratio.. just about the time you're off the clutch and back on the gas.. building boost at full throttle while the ECU is leaning the air/fuel mixture. Not a good combination.