Quote:
Originally Posted by The Radium King
ask yourself if maf readings matter. if trims are good and 02 sensor is working then maf readings must be ok, hey?
otherwise, what problem are you trying to solve? in your other post you think you are down on power. any of the info you are referencing is for closed-loop, part throttle operation. if you are having a max power issue then car is running open loop so o2 sensors, stft not in play. given that trims are good then maf readings are accurate. i would look at fuelling - filter, injectors, perhaps fuel pump. these things can perform within spec at part throttle operation but start to fail when at wide open throttle. this won't get detected by the ecu until the lack of fuel starts to cause pre-detonation and knock. perhaps check your knock readings and see where they are.
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+1for the above....
Also your looking at "Hot Film MAF" readings...
Your car has a Hot Wire MAF sensor so "Hot Film MAF" readings are meaningless.
Another point...fuel trims are expressed a little differently by the Durametric (Porsche)
They break them out by RPM or engine load "FRA" I believe is under load or mid RPM range.
So to look at FRA fuel trim when the engine is at idle is meaningless...