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Compressor surge is when you chop the throttle and the turbo is still moving so much air that it blows backwards through the compressor. Its usually a fluttering whistle type sound.

Diesels arent too bad for it since they dont have any sort of throttle body but it is still entirely possible to have compressor surge on a diesel. My HY35 will surge, but only from a 45psi throttle chop (shift) and even then it only does it sometimes.
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