Quote:
Originally Posted by Dark Sun
Ok so I have to ask, if there is no fuel measurement, why does the scanner show fuel pressure, commanded fuel pressure, injector flow, and how does the ECM in open loop know how much fuel to meter into the engine based on MAF to maintain an AFR from the factory without a wide band sensor?
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The computer is calculating things from the model using things it can measure and then adjusting things on the fly based upon what it sees. But if the model isn’t correct then it doesn’t know that there is a problem. And if you change parameters such as increasing boost, the models are no longer accurate. The models then have to be adjusted. What do you think is happening when things are “tuned”. If your math worked, why would it need narrow band o2’s?