ok, my friend has a tial knockoff bov for his mk4 supra. he is currently running 9ibs of boost with a idle vaccum reading of -22. he first thought the spring was to tight because the valve to the bov wasnt opening. then, after that discovery, he cut a few links off the spring to see if it would open. later, he made a mistake, realizing that the vaccum source he was using for the bov, wasnt getting any vaccum. after that, he then found a good vaccum source and plugged it in and started the car. then he started the car and the bov opens at idle because the spring shouldnt have been cut all along.

i guess the question here is, do you guys have any idea what psi spring he should order for his car so the bov will open and close at the right time, please let me know. it is needed ASAP cause the supra meet is this saturday.