Im sorry in the terms of the words that I used, and would like to clarify...
You are correct in that the MAT Air Density Table is based on the "ideal gas law", but the issue is that it is based on physics not the real world. From my research and viewing of numerous of my own datalog's over the past 6 months, I have noticed that this is something that most of us ignore thinking we don't need to tune it or don't know much about, so I wanted to give back to everyone my findings to gain others feedback on the subject.
What I have found out is that the "ideal gas law" is based on an air temperature of 70* to be 100%, and then as a correction% adds fuel when colder than 70* and removes fuel above 70*. The curve is set by default assuming that the MAT/IAT sensor is reading ambient temperature (or close to) as being the intake of air into the engine. In our case of our sensors being located in the lower intake manifold these numbers will be increased due to the heat of the engine. This is very different from "heat soak", so we can not confuse the two. If you review your datalogs for the field "Fuel: Air Cor" you will notice a %, which if less than 100% it is removing fuel and above 100% it is adding fuel. I noticed in my datalogs that my average MAT temperature was around 150* during normal driving/cruising at 70* ambient temperature, which means that the correction% factor was around 82% based on the default curve which is removing 17% fuel.
From what I can tell the curve needs to be shifted to your average MAT Temperature at 70* ambient temperature, but I am not sure if this is correct. Other turners also seem to think the curve maybe to aggressive as well, but this can be confirmed at different MAT temperatures and your EGO Correction% as long as you have a good VE Table to work with or you would be chasing your tail. I wanted to put this out there to everyone for there feedback on the subject.
@a91what what are your thoughts as I respect your feedback.