I run a -31 and the pressure in the exhaust housing lifts the wastegate open at 30psi(at the correct preload).......yes you can wind a bit more preload on but then you get uncontrolled boost creep at high rpm so unless you can hit 400bhp with a t34 at less than 30psi you need a stronger actuator

i meant a -31 with a t34 in the earlier post..sorry for the confusion

Pugo