Originally Posted by BrandonSmith

I'm new to tuning. I have a PV2 from @fuelmoto with their canned tune. I have run multiple Auto Tune sessions. Now I'm looking at timing. I know I can reach out to FM to get the timing dialed based on my logs. However, I like to learn and have an understanding of what is going on. I have the time to look at it myself and want to get some hands-on experience tweaking a tune.

I plotted my spark knock retard events from my data logs. Below is RPM vs MAP (kPa) x Spark Knock Retard Front Cylinder (degrees). The plot contains over 15,000 data points from my log of over 30,000 data points (i.e., over half of my data points contain knock retardation).

Based on this info, from 50-85 kPa and 2000-3500 RPM, I am getting between 2-3 degrees of knock retardation. Therefore, should I retard my timing in that region by the corresponding degrees of knock retard (i.e., the advance timing number would be smaller)?

Am I thinking about this correctly? Or should I just leave it alone and let the ECU sort it out?

E10 91 octane. This graph gets off the charts (6+ degrees) on non-ethanol 87 (the only non-ethanol in my city).