Hi

helping a friend out with his audi 8l a3 1.8t aum, we fixed the wastegate issue in the following thread (the previous owner/tuner manually adjusted the wastegate too stay closed)

http://nefariousmotorsports.com/forum/index.php?topic=1380.0title=

I am trying too understand why in the latest log we did last night, that at 100% throttle in 3rd gear 2000RPM wot the n75 duty cycle is sitting at 94% when actual boost isnt anywhere near requested (this is off the tune that was on his car already), the way I understand n75 duty cycle is that if actual is higher than requested then n75 duty cycle would be higher ie 94% but if actual boost isnt at requested n75 duty cycle would be 0 ie closed too allow boost too climb?

At 0% dc, all the pressure goes through the n75 and to the wastegates forcing them open to limit boost. As dc goes up, the n75 is bleeding off the control pressure to keep the gates closed and make boost.

No. 0% would cause the wastegate to open as soon as cracking pressure is met, and boost would not rise past cracking pressure.