Quote:
Originally Posted by mmmotornutz
Hi Mike, how can you assume/conclude/state that the decrease in timing is due to the ECU's reliance on knock sensor feedback alone?
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That conclusion is based on eliminating the other contributors. Such as:
1) Boost. Was the same throughout the run in each gear.
2) Gearing. We've seen in same gear single gear pulls timing values are consistently much higher.
3) IAT. We've seen logs showing IAT decreasing throughout the run, yet still having these large timing drops.
There is also a new factor that was introduced, rate of acceleration, which we'll have to study. Will that explain a ~10 degree timing drop? I don't think so, but this is a discussion forum so lets explore it. I will say that I only have to show ~1 degree of consistent "knock retard" with CPS offsetting in place to prove that timing is always floating / always riding the knock sensors.
Mike