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ah thanks for clarifying for me cheers, yeh i thought the spring had weakened on mine which is why i put the aftermarket one in oh well live n learn.

im talking about when the throttle butterfly is closed guys. this is why people have adjustible BOV's on cars as you can change the rate of compressor surge. of course it makes no diff when equal pressure is applied under accell. If the spring is too tight it wont open, ya get flutter and a gut full of unburnt fuel which equals backfire between shifts. Ya have it too loose n it can open while your idling which personally i dont like AKA standard BOV which is what mine was doing anyway. Probably due to an aged, weakened BOV spring. You have metered air passing through the maf sensor and not entering the engine at idle. I know its a plumback system n all but ill choose one that doesnt open at idle. let me know if you know how the metered air is compensated for in the fuel map when this happens and ill stand corrected but i cant see how it is done. I have checked the wiring diagrams and cant see how it is metered accurately...

r31nismoid - the only proof i can share to back up my first post is that a BOV springs strength is designed in relation to the amount of manifold vacuum applied vs the boost pressure on the other side. Therefore extra boost and same manifold vacuum = open sooner. I understand your point you would make that under boost the pressure is applied to both sides so there is no problem here and your right you wouldnt notice a difference but really your BOV would be opening a touch sooner when the boost is raised. Sorry cant reference any evidence for you to look at about it just my understanding of the system.

each to there own with this topic i guess. I run a GFB plumback and i am happy with it. Just wanted more confidence that there would be no loeakage when I raised the boost.

i just put rockford fosgate 6.5" in my front doors. Sounds great think they are 3 way....

Standard BOV's are designed to run standard boost....if you up the boost you need to up the other components aswell or eventually sumthins gonna fail. I recommend an aftermarket BOV with a better quality seal and stronger spring to avoid leakage. maybe an adjustable one to get rid of your flutter problem.