I'd really like to also be able to log ambient temp too. Is there any way to wire in another GM AIT sensor to the ECU that could be used for measuring ambient temps?

Here is a graph showing air temps at the MAF (blue) vs. air temps inside the intake manifold (purple). This was a 3rd gear pull on DB's dyno.

 

mrfred, weren't you going to try and do this somehow?

 

MAFIAT is the same as ambient (once it bottoms out)

so in your above graph, the blue line bottoms out at 75 degF. so your ambient would be 75. does that sound right?

Personally I think your MAT (unless u got WorM/I) is reading low...

 

I'm on straight pump gas, nothing injected. The GM AIT sensor in the intake manifold (MAT) reads the same as the MAF when the car is cold which leads me to believe it is fairly accurate.

 

ok... maybe its ok then...