I am having an issue with my BOV. It is a Greddy Type-S. I know the BOV is not the problem because I can see it close and open. When driving the car and hitting boost then releasing the shift to the next gear I can hear compressor surge and no release from the blow off valve. I checked the vaccum lines and they have good suction. The gauge reads perfect vaccum pressure at idle as well. I am out of ideas any help or advice would be greatly aprreciated. Please Post Back.

Thank You,
Nick

 

Dont double post .

 

same ---- just happened to mine, you diaphram(i will look up that word) has a tear in it, take the bov apart and u will see

 

It cant be the valve becuase this is the second one I have tried and the problem is still occuring

 

so does that mean u have an extra type s?

 

No. The Type-S is a my new one I have an extra TurboXS Valve.

 

same flange?
i have the types s in will it fit the same flange

 

The TurboXS valve doesnt have a flange it is more of a horn design that stays in place with set screws.

 

Its obvious you don't have a good vaccum source.