So I'm new to this, and have been trying to piece it together on my own. Here is the data, that I logged on my 2015 Challenger Hellcat.
RPM: 4382
Aircharge: 1.20(g)
Spark ADV: 17.0
Spark ACT: 17.0
IAT Advance: -1.5
Accel Pedal: 3.83v
Timing Advance (SAE): 17.0
ECT: 207F
ACT: 138F
IAT: 129F
So looking at the beginning I started with the WOT pedal threshold, 3.83 > 3.19 so it is definitely using the WOT Spark table (44361). So looking at the aircharge, I go to 1.20 and cross reference it with 4320 column as that is the closest value (is this correct?) and pull 18.5 as a value for degrees of advance. From there I look at the temperatures. ECT is below 244 so I don't think that the ECT Spark Hot (32094) table comes into play (even with the deadband of 244-32=212, this should still not come into play). Then I look at the IAT and see it is at 129F, so the IAT Spark Hot table (32124) should not come into play. Where is the IAT Advance of -1.5 coming from? What table am I missing that would have this value?
Also am I thinking about walking this back correctly, didn't see a formula posted about this.
logging_spark.jpg
Sorry if this has been covered before but I didn't find anything in search.