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Shooting in the dark, but I'm hitting targets!
Usually a bad turbo will smoke its ass off. Before I understood the importance of a trailer, I blew a SR turbo at the track and had to drive 2hr home. Let me tell you about rolling coal. You can always remove the piping and check for shaft play or oil in the intercooler piping. I usually associate load related issues with fuel, but it could be anything.
Do you have a tuning device to accommodate the boost controller changes? If not, remove the boost control (wastegate actuator straight to hot pipe) and put it back to stock to minimize variables.
What does the wideband say when you are breaking up under load?
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P.A.T.T.
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