N75 Valve (058 906 283 F) Behaviour/Boost Plot
05-09-2010, 12:43 PM
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N75 Valve (058 906 283 F) Behaviour/Boost Plot
I posted this up in the 1.8T discussion earlier, but I figured I'd probably do better here:
I'm trying to determine whether the N75 valve (part # 058 906 283 F) on my 240 PS 1.8T engine is behaving as per the design intent. The internal resistance is within the range specified in ELSAWin workshop manual, the duty cycle appears normal. I do not have, and never have had any standing ECU fault codes. There are no known or suspected boost leaks on the vehicle. Peak power, torque and boost can be reliably reproduced with different fuel grades ranging from 95 to 99 RON and ambient temperature ranges. It is a five year old car with 37,000 km on the odometer that is running a stock ECU map, 200 cps high flow cats, aftermarket 007p dump valve and induction kit.
Does this plot of delivered boost (red graph) against ECU requested boost (white line) look reasonable? If not, are there any suggestions of what might be at fault? What is the usual degradation mechanism for these solenoid valves?
Any advice would be greatly appreciated before I shell out $90+ for a new valve!
Best regards,
Fay_Heaver
I'm trying to determine whether the N75 valve (part # 058 906 283 F) on my 240 PS 1.8T engine is behaving as per the design intent. The internal resistance is within the range specified in ELSAWin workshop manual, the duty cycle appears normal. I do not have, and never have had any standing ECU fault codes. There are no known or suspected boost leaks on the vehicle. Peak power, torque and boost can be reliably reproduced with different fuel grades ranging from 95 to 99 RON and ambient temperature ranges. It is a five year old car with 37,000 km on the odometer that is running a stock ECU map, 200 cps high flow cats, aftermarket 007p dump valve and induction kit.
Does this plot of delivered boost (red graph) against ECU requested boost (white line) look reasonable? If not, are there any suggestions of what might be at fault? What is the usual degradation mechanism for these solenoid valves?
Any advice would be greatly appreciated before I shell out $90+ for a new valve!
Best regards,
Fay_Heaver
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