So here is my problem:
Just installed a fmic along with the previously installed bov. Now I have this very annoying surging sound that increases with higher boost. I have tried adjusting the bov spring tension from low to high, mounted it in a different location, and tried different vac sources. I just cant figure out why this is happening. Any help will be greatly appreciated.

My set up:
stock s4 ecu
safc neo
Knightspots hybrid turbo
3" tid
2.5 intercooler piping
apexi twinchamber bov
12psi boost

 

nobody?

 

You ever figure this out? I'm having the same problem.

 

When you let off the throttle, or on throttle?

 

Coming off. But slowly. If I just quickly let off its fine. I think it's my bov.