Originally posted by DemonSVT:
A Blow-Off Valve is NOT the same as a Bypass Valve. A Blow-Off valve is a safety device that opens at a set psi level to prevent over boosting the motor.
Although I agree they are different, I thought they had the exact same purpose??
Bypass valves are used on MAF engines (Porsche/VW/etc) where venting air that has been metered is not an option.
MAP sensored engines (Honda/Toyota/etc) can have a valve simply blow air outta the intake tract to prevent compressor surge, simplifying plumbing, ang giving out the lovely "pschht" that everyone craves.
But to me the functionality is the same, isn't it? They both prevent overboosting (to an extent) but they both mostly work against compressor surge as well.
Hence I don't think
rimmie is so far off. Overboosting is controlled by the Wastegate... Isn't it?
