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Hi, i have a problem with my car, when its on boost, intake manifold pressure starts jumping +-0.3bar. I ruled out all the electronics, its something mechanical, but i just cant find it. no boost leak in system. everything seems working. car is runing, cant feel any jerking while driving. it still doing the same if boost controler is disconected, when runing spring pressure. maybie someone had same isue? data log screenshot attached.
car info:
audi S5 V8 4.2
garrett g42-1200
two tial wastegates
Attached Files
Screenshot-2025-08-07-215534.png
I would investigate your wastegate(s) for proper operation (not sticky, or a valve sealing problem). Or maybe that's caused by having two wastegates with a beat frequency between them.
