The fuel trims and N75 duty cycle are all set to the stock intake air flow.am facut un test comparativ cu o skoda superb si valoarea valvei N75 se schimba in functie de turatie. Log-ul ASTA arata clar ca dupa 2500 rpm valva N75 (Duty cycle regulator valve) ramane blocata in valoarea 92,4 indiferent de viteza si turatie. Am o teorie asupra problemei mele si vreau sa ma corectati.so looking at the graph as accelerator is pressed. A low duty cycle equates to the ECU asking for more boost from the turbo, and a high duty cycle means the ECU has too much boost already and is requesting the boost be lower. His turbo was a 6-month old factory replacement with an incorrectly set actuator! N75 Duty Cycle this is given as a %, the highest it reads to is 75% and the lowest is around 30%. Engine logs revealed that the N75 duty cycle was a lot higher than normal so the turbo actuator was adjusted to factory specs. There's an apparent improvement, but it's still overboosting. Then it occurred to me that there was gunk on the intake manifold where the. Still, the issue was there and I had to find something else. I deleted the N112/N249 which made the recirc-valve respond much quicker. I also found a hairline split in the pipe so I replaced it.
The N75 duty cycle was normal so I ruled out that one for the time being.
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