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I do not want to be argumentative either. I'm just saying an engine is not tuned properly when the ECM regularly pulls several degrees of timing. When adequate octane fuel is used and the tune parameters for MAF, fueling, timing etc. are maximized, several degrees of knock retard should not occur. My experiences are that when the ECM pulls timing, it does it quickly and may even pull more than is warranted for the conditions being encountered. If it does give timing back while under WOT conditions, it does so much more slowly than when it pulled the timing. I am suggesting that setting the advance to a degree where the ECM no longer pulls several degrees of timing will produce better performance than running excess advance and allowing the ECM to take it away and give it back willy nilly.
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