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.
On last Saturday I went to a carwash and didnt shut the door properly and i found out that my carpet is all wet, and worst the carpet padding(sound proofing) is all wet!:rolleyes...
I've noticed on overseas Skyline forums that once most Skylines cross a certain level of power, seems to be around 600-700hp, they tend to have fire extinguishers in their cars. I'm curious as to what could possibly...