Quote:
Originally Posted by RalliartRsX
Its a T4 twin scroll, so 0.8 (or .93 as BW EFR measure it) turbine housing. We pulled the exhaust off from the cat back, so it was only downpipe, and still the same issue. So it wasn't a back pressure issue. We picked up less than 8WHP when we pulled the cat, so definitely wasn't a back pressure issue. And the same occurred.
Gate was just wide open it seems regardless of duty cycle. We could get it to spike mid range, but it always went back to wastegate pressure and tapered off by 7K RPM.
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You've removed everything post turbine, i.e. elbow downpipe etc. The issue usually never is there unless it's blocked.
I was referring to the backpressure between engine and turbine wheel. So pre-turbine pressure.