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.
Bookmarks