Quote:
Originally Posted by apk919
I don't have a definitive answer, but I'm leaning towards IAT being pre-SC. Maybe an engine expert can chime in (paging charliex...). Even though there's some correlation, it seems that changes in IAT are related to engine temperature (which is correlated to RPM/Load also) and not charge temperature. I don't see IAT being higher than the post SC/pre IC data in the graph below (from your session3). There's been some discussion of how the throttle body gets heated by some of the emissions gear, which can cause IAT to rise higher than ambient, and be related to engine load.
The pinouts you're referring to are just two pins from the TMAF... and yes, TMAF stands for Temperature/Mass Air Flow sensor (it senses both).
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Just to add a little support to this... here's the graph of downstream cooling air vs. speed that I logged... note that there are 10-15 degreeF (6-8 degreeC) increases in the cooling air during high load periods... I'd expect to see some of that in the IAT if it was post IC...
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