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Message: [QUOTE="Hotrodtractor, post: 191559, member: 25"] How do you know what the actual timing is after a live tuning session? FWIW - a scope using just the CPS signal and the injector signal will not give you "actual" timing - but it can get you in the ballpark. The signal output of a CPS signals the computer that the engine is say at Top Dead Center (TDC) - we know that that signal location relative to the actual TDC is different between the black and the blue CPS - the blue CPS retards the signal going to the PCM relative to the black CPS. Agreed so far? To have your truck "live-tuned" is going to dial the truck in spot on right? So we go out and we do this with a black CPS and the world is grand. Agreed? Now we toss in the blue CPS - and the timing has been retarded because of it correct? Now we live tune the truck with the blue CPS to get the truck dialed right in spot on again. To get the truck dialed right i spot on you need to have the combustion events occur at the same time as you did with the black CPS - so this new tune just has to add timing to compensate for the retarded signal. If we scope the truck with the blue CPS you will see more timing on the scope - but that doesn't mean that you actually have more timing in the motor. The only way to truly know the timing of what is going on in the combustion chamber is to KNOW where the actual events are occurring in the combustion chamber. [/QUOTE]

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