TT (Mk1) Discussion Discussion forum for the Mk1 Audi TT Coupe & Roadster produced from 2000-2006

Unexplained Overboost?

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Old Apr 1, 2023 | 10:41 PM
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Default Unexplained Overboost?

My ALMS is experiencing overboost and I can't find the reason. Anything over 1/3, and/or 5lbs of boost just sets the car into a frenzy of overboost. I've tried running without the n75 and maf. No change. My wastgate actuator is fine and the wastegate arm doesn't have play. There are no boost leaks. I had a MBC on for 3 years, consistently running 10 lbs of boost with no issues. This overboost issue happened all of the sudden.
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