Also to be noted, i was racing the night after and after a couple pulls, i lost a wastegate bolt!
Im not 100% sure if i had any wastegate / manifold leaks on the dyno, but i didnt hear any leak and the bolt was in.
Look at the end of his 1st post I predict it's actually very simple. A hacked setup with no dump tube, no fire ring, and/or blown wg or turbo flange gasket. It sloooowly moves to 140 wtq, then shoots up to 190 wtq over 200rpm. That tells me it's probably exhaust leaking until there's enough flow to overcome it and build exhaust pressure.
Another problem that creates is a huge loss in power at whatever RPM that leak exists. It probably has slipped or mislabeled cam gears to compound the main problem.
If it was very restrictive after the WG, or open dump + tiny exhaust, torque will also shoot up right as the WG opens. Ask anyone who's played with a VGT turbo about that. 10psi & 28cm housing
> 20psi & 2cm houing.