Modeling the a/f response to changes in temp

[TurboLS]

Hey guys. I was wondering if you guys had an ingenious way to minimize the number of variables when datalogging to determine all the correction factors one by one, or atleast as few as possible. Basically, I want to be able to get a few good data points for A/F response to say, IAT, but since I can't induce all IAT levels, I can't exactly account for the changes nor can i generate a curve that fits all the possible data. What I was thinking is getting some good data points that relate to current temperature conditions (summer time 65F and above) and tune the curve for say 70F IAT and set that as my 0% correction point. Then, I could use the air density calculation to estimate the change in fuel necessary for all temperatures. I could do that in conjunction with fitting a polynomial equation to the data I have and looking at the overlap. The problem I am having is that even at idle, the RPMs are jumping a bit, whether it be due to the radiator fan kicking on, or something else. Do you guys have any better ideas?? thanks.