Announcing TopgunZ ACE Supercharger Kit!

Originally Posted by Optimiser

According to that article isn't that what the BOV prevents (compressor surge)?
Assuming the BOV is working properly and has the correct spring for the application.
My guess is that when the "fluttering" noise occurs, it's from a condition of zero boost /vacuum and the particular BOV's spring allows the valve to open and close a small, fairly rapid amount because in those conditions it's getting some sort of oscillation between tiny boost and tiny vacuum (neutral).

Originally Posted by redondoaveb

Yeah, that's definitely what the bov should prevent. Not being a supercharger expert by all mean's, could the placement of the bov have an effect on it's efficiency?

I was getting fluttering when I had my qrj installed. I replaced the 1.5 psi spring with a 3 psi and it was fine after that.