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Originally Posted by V8TV
Jody,
Do you have an opinion on how much an intake manifold will color the findings of an air charge temp sensor? My ACT sesor lives in my Edelbrock aluminum intake, and it seems that the intake would warm the sensor. I assume this is the reason why later systems seem to have the ACT sensor upstream in the plastic / rubber air intake tube.
I've seen some people who simply move the ACT forward and out of the intake, but I believe the ECM should know the temp as close to the combustion chamber as possible to correctly maintiain the right tune.
My procedure will be to install the cold air systme but leave the ACT in the manifold and log some data to see what happens.
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You are correct in that the temp closest to the cylinder is the most accurate. Extending the IAT harness and getting the IAT into cooler air will pick up some power as the computer won't be pulling as much timing. Most people notice their late-model car feels stronger before it's fully warmed, and this is one of the major reasons.
In the intake will be slightly off, mostly in a heat soak like idle and right after a re-start. But I think it would stabilize pretty quickly with the airflow coming over it. I've run there before with no issues, and the air temps didn't look much different than when I had it in the filter assembly.
Jody