Originally Posted by Franco
I take it you'll know while giving it beans if the turbo's surging
What are the main causes for this then........... Mechanical failure?
Its sounds like "wastegate chatter" but at full boost full throttle instead of as you back off.
The reason is an incorrectly matched turbo/engine combination essentially, its nothing to do with mechanical failures.
Typically its when someone has a turbo with a big compressor side for huge power but tries to get it to spool up quickly by having a small hotside on it.