Tuning 85 TPI - Need spark tuning advice

[Fast355]

Yes you are right, I missed the Coolant spark table. That would adjust spark uniformly across a RPM for a load range. Interesting that it will add 10 deg at the highest load in very cold weather. That seems like a lot. The mixture at that temp must burn so slowly that they can throw a 10 deg advance at it with no problem. I still don't see anything that looks like IAT? I like that the tuner was using the PE spark table to add for richer AFR. That seems like a more refined way to do it. Except I don't understand how the ECU could use that table with a narrowband O2 sensor? The table has precise AFR ranges.

I have a $1F and $1F Updated .XDF that both have MAT (basically IAT) based spark compensation tables in them. As for the PE AFR Spark, it is done off commanded air/fuel ratio. When you are in open loop the mixture is commanded richer than 14.7:1. In PE the PE adders modify the commanded air/fuel ratio from 14.7:1 or whatever stoichiometric is set at. Should set Stoichiometric at 14.2:1 if you are running fuel that has 10% Ethanol in it. On my definition the MAT compensation is labeled Spark Advance Correction vs MAT. In very hot weather it can be helpful to remove 4-6* of timing when the MAT is elevated to help keep you out of detonation.