Originally Posted by Lord Of War
Humor me lol, both.
It really depends on the load. If there is alot of heat soaking going on it will make the situation much worse.
It can easily add 5 degrees F into the charge.
This won't affect your timing advance much but at higher RPM I can see a 1-2 degree difference is likely possible.
I would like to actually try a study to measure this.
Look at the maps below, you can see the limp mode programmed in with high IAT.