If you increase the valve pressure (turn in the screw), you increase the valve's resistance to opening at lower vacuum levels, meaning part throttle or at idle but you also increase the occurrence of compressor surge, which is what a BOV is there to prevent in the first place.
Dear All Sifu,
i need all your advice and opinion.
i suspect my gearbox KONG already.
on yesterday i feel my car have jerking and have metal sound came out. first i suspect my turbo kong because when i step the pedal...