What is the N75 Valve? The N75 valve is a fundamental part of controlling boost on a 1.8T engine. Its a small electronic solenoid valve that the ECU regulates to control how much boost the turbo has to create. The value that many logging tools show is the ‘duty cycle’ which is what the ECU is requesting the valve controls the turbo to make

Jul 2, 2013 · S4 / RS4 (B5 Platform) Discussion - 2001.5 s4 boost issues - n75 maybe? - Having some boost issues with my 01.5 s4, was pulling misfire codes and changed plugs, switched coil packs around and had no luck, finally last weekend I removed my fuel rail and replaced the O rings on the injectors, fixed it right up!

Jan 16, 2007 · S4 / RS4 (B5 Platform) Discussion - Is it possible to log the MAP sensor and N75 valve to see if they are failing? - I am wondering if there is any particular values (eg. voltages) which would let me know if these two parts are working properly. The two parts currently in question are the manifold absolute pressure

Dec 3, 2005 · Re: N75 with external wastegate. For you 30-76 you will need to tap the compressor housing or you can tap the turbo outlet pipe just after the turbo. You can vent the line that reroutes into the TIP to atmospher, or you can send it to the top of the wastegate to assist in closing it. 11-14-2009 07:10 PM #10. A4twin.

Feb 7, 2007 · I just bypassed my N249 by running a hose from the original T directly to the DV's. I guess the valve was shot because I've definitely noticed an increase in how smooth the car drives while in part throttle around town. 2000 B5 S4 Stg II+. 04-09-2009 02:42 PM #37. csre9. Jun 26, 2008 · N75 valve test. Logging duty cycle will tell you how hard the n75 is trying to open the wastegate, no need to risk damaging your engine, although that method is probably more fun. Can also log requested v actual boost. 2000 Audi A4 B5 1.8TQM AEB/06A. 1998 Audi A4 B5 4.2QM ( Thread)
Sep 7, 2022 · The Audi A4 is not different in this regard and uses vacuum to assist in the EGR (exhaust gas recirculation) system as well as the intake system. The EGR is part of the efforts used to recirculate unburnt gases from the motor back into the combustion chamber to be burnt and result in a cleaner running engine.
Apr 11, 2010 · 4854 posts · Joined 2007. #10 · Jan 2, 2012. By the looks of things the N75 could be faulty or the wiring to it could be faulty. Try unplugging it and cleaning the connections, delete the fault codes, and see which fault codes come back. Audi A4 B6 Tdi. Skoda Octavia "down and out". S. Feb 17, 2009 · A4 (B5 Platform) Discussion - EPC Light/Irregular Boost problem completely fixed.WooHoo! - While I was replacing the N75 valve (I believe it was the latest F valve) and the Pancake 034 PCV valve, I noticed the tubing connecting the N75 valve to the little nipple on the turbo housing was almost completely severed. zGiW.
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