Mine is an internal gate, and it's full open at like 8psi (aka wastegate pressure). But 70% duty cycle is 20-22psi and 80% is 28-30psi. That's just a set duty cycle across the board. I'm actually going to be installing a scramble button next month, so when I'm at the track I can launch in first and second on the 70% duty cycle setting and then when I hit third hit the button to go to 80+% duty for the rest of the run.