[apk919]

Originally Posted by Mag

first off, I am just learning by seat of the pants so excuse me if the following is totally off. TMAF= temperature mass air flow?


If what you've pointed out is true:

1) why would TMAF have high correlation with RPM/Load etc? as you say the location is pre - SC.
2) How can this temperature be consistantly higher than that of the post SC/pre IC temps?

Searched around found this link. Pinout 18 TMAF - IAT ground and 31 TMAF - MAF ground. May be there are 2...

Forcedfed Dyno Plot

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).