are we talking about GT conventional turbos? or GT VNTs? cause all my info pertains to a VNT.. and in a mk1 chassis..and the reason you hit 30 psi by 3 grand is cause the vaines are not opening far enough, and the turbo is overspooling.
Same here. A GT15 from a stock 98 Jetta 1z-AHU engine. Mine has a solenoid either vacuum or pressure controled.