watched my rpm and boost at 500 rpm increments from 2000rpm to when ever you boost reaches one bar. I remember stock with test pipes I got 10 psi at 3000 rpm and full boost at around 3500rpm . My bigger turbos got 3 psi at 3000 rpm and 10 psi at 4000 rpm and one bar at 4500 rpm. You might want to graph your spool up similarly.