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.
I propose we have a regular lunch meeting at Kayu Nasi Kandar in ss2 (next to Chow Yang)the last Sunday of each month at say 12.30pm for our informal club gatherings. This place has good ("clean") mamak food and is...