BarraPatrol11

Yeh its running 35 inch rubber and a big Patrol box behind it so its uses up a bit of HP there but yeh I think its too much boost. I think its hitting overboost and shutting off at 22psi

I have a GU Patrol with a Barra Turbo swap. Its FG gas bottom and BF head. Got a few things done making 400rwhp running about 20psi. My issue is that when you realy put the boot into it in 2nd gear at around 3500-4000 it looses all power instantly, if you let off it kicks back in. Its backfires and makes some horrible noises when it happens. Only happens in 2nd. Already replaced plugs and coilpacks. It has to be either fuel or boost cut just dont know why its happening or how to stop it. Cheers for any help.