I never set the full open pressure. I think the correct setting is "cracking" pressure where they first start to bleed off exhaust since after that it takes increasing boost to make up for the opening of the gates. I set mine to crack open at 11.5 PSI (.8 BAR). I defined crack open as the point where the little disk, valve, door or whatever just got loose enough to move with my finger. With my EBC off it boosts safely to about 12PSI.