i found an excel file for the resistance range on the GM open element IAT sensor. I added the formula from the adaptronic manual to give a column for our ADC values GM_IAT_CAL.xls

i have not tried it out yet, but it looks pretty good.

 

I used the one from TurboRoach from here:
https://www.miataturbo.net/forum/t33628/

It seemed to be very accurate, matched CLT temp after sitting overnight etc.

 

wow, dont know how i missed that one.
now i need to test a few points to see which one is closer.

thanks for bringing that to my attention.