Quote:
Originally Posted by scheherazade
I guess the next question that comes to mind is :
A) Does running more aggressive timing make more knock
B) If so, does the knock go down over time
C) Does running less aggressive timing make less knock
D) Does any knock come back over time
I honestly don't know if the DME has the granularity or range to handle every situation a tuned car will present.
I just know it's designed to try.
-scheherazade
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Answer to A) is yes if you consider reducing timing retard to make your timing more aggressive. I have tried this and do get knock events more often. I find that generally speaking, with 30% ignition correction I get a smooth knock free curve most of the time.
Answer to B) seems to be no. But I think that the combination of passive driving in traffic versus brief periods of WOT makes things too dynamic for the DME to adapt to. I can run on 2-5 psi in daily driving for long periods, then one day go for a few WOT's at 14 psi. Perhaps that is just too much range.
Running this current combination of 98 octane, 1 degree of timing retard and 14 psi seems to give me very nice timing curves most of the time.
I pulled one earlier this morning and it looked great. Yet of the two I pulled this evening, one of them knocked......but only at the shift point. So that may be an exception.
I think my engine is pretty happy with current settings, but I do suspect you are right that the DME is always testing the curve up to it's upper threshold.
I just don't seem to see any consistent timing drop between runs when a knock event happens. It's as if the DME is always testing the stock timing curve.