Well, since I pulled off the blow off valve on my C5Z to check for fluid at the bottom of the intercooler, and also found a broken O-ring, I got to thinking about how the BOV actually works, and drew a blank.
Here's one description of the operation:
Hmm, what exactly does THAT mean? If the BOV opens when manifold pressure is below zero bar, then what keeps it from opening during normal driving when the intake manifold has a vacuum in it?
The reason I am thinking about this is because since the wastegate springs were increased from the stock STS 6.5 lbs to 10 lbs, does the BOV need to be adjusted or in any way changed to reflect the increased psi that will be in the intake manifold?
Obviously I don't understand exactly how this device works, but I don't want to just assume that what is on my car now is actually CORRECT.
Here's one description of the operation:
A blowoff valve is connected by a vacuum hose to the intake manifold after the throttle plate. When the throttle is closed, the relative manifold pressure drops to below zero bar and the resulting pressure differential operates the blowoff valve's piston. The excess pressure from the turbocharger is then vented into the atmosphere or recirculated into the intake upstream of the compressor inlet.
Hmm, what exactly does THAT mean? If the BOV opens when manifold pressure is below zero bar, then what keeps it from opening during normal driving when the intake manifold has a vacuum in it?
The reason I am thinking about this is because since the wastegate springs were increased from the stock STS 6.5 lbs to 10 lbs, does the BOV need to be adjusted or in any way changed to reflect the increased psi that will be in the intake manifold?
Obviously I don't understand exactly how this device works, but I don't want to just assume that what is on my car now is actually CORRECT.