You just have to try it and see how it does. It is not the same for each car.
Set it around 20 or 30% and see if the boost comes on pretty good without
overshooting the pressure. If too slow set it higher and if it over boosts too much lower it some. Hope that helps.
Yup, although different motor, I used same method. I started lookin for 13 psi at 30%, upped it a little bit each time it fell short. Ended up at 42%, holding perfectly, and then if you go back to look at duty cycle again, you'll see asterisks signaling it's now learning the duty curve itself.