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.
Where can I sent my safc1 for repair cuz when it comes to sensor part kinda thinggy it's totally hang, cannot do anythng..some said get a new board da small one..plz help me