The beginnings of a Megasquirt how-to guide

[icingdeath88]

Originally Posted by BackWoodsBob

Hm, there are 2 sensors on our maf's, I thought one was ambient air temp sensor. Maybe I'm wrong.

There is no ECU pin carrying such a signal from the MAF. If there's a separate sensor, it's self-contained to the MAF. I kind of doubt there's enough circuitry in the MAF for that though.

Idea: Maybe using some kind of math trick where you calculate the airflow using the MAP/RPM method, and again using the MAF method, and the discrepancy could give you the air temp? But I don't think any of us have the know-how to make any use of that idea. And if the MAF is going to be connected anyway, then there's not much point, you could just use the MAF itself.

The GM IAT sensors are cheap enough that that seems the easier/simpler way to go in any case. Like I said before, also, you can just use a suby CTS if you have a spare, since the resistance/temp curve is known (posted on first page). But it won't respond to temp changes as quickly as an open sensor like the suggested GM one. Depending on where you put it in the intake path and how big of temp fluctuations you expect to see, if may work just fine.