n75 a4 b5

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N75 wastegate actuator valve explained/symptoms. - AudiWorld Forums

EXPLANATION
The N75 valve controls the turbo wastegate actuator via directing air pressure to it by actuating a tiny solenoid when the ECU decides its neccesary. this solenoid can turn on and off VERY fast to keep the boost at the proper constant. basically it prevents overboost electronically instead of relying on a set tension spring on your wastegate. Its a plastic "T" with a small solenoid and the 2 prong plug on it. 3 hoses: 1 from the intake hose before the turbo, 1 from the intake pipe right after the turbo, 1 from the wastegate actuator.

N75WGFVshowingLegOrientationInConjunctionWithADIYMBC.jpg
 
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