IAT placement

[Programmer]

Bob,

Locations vary by manufacturers--GM puts some in the airbox, Cadillac has
"some" in the intake near the cyl head, Ford has their IAT in the
plenum...there is 3 examples of varying locations that are going to vary
immensely in "actual temp" of the air charge. Guess it boils down to
thermistor values and how they react to air vs. written code...I've never
really checked out the differing values in relation to location...

Lyndon
-----Original Message-----
From: Bob Valentine <bob at tecmark.com>
To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
Date: October 28, 1999 5:38 PM
Subject: IAT placement


>What's the collective thought on placement of the IAT sensor?
>
>On the TPI the IAT was originally in the manifold; on my setup I can put it
>either in the airstream ahead of the throttle body, or I can drill & tap a
>hole in the intake for it.   Obviously, the first is the easier method.
>
>I would think that a sensor in the manifold would read a few degrees higher
>due to heat transfer from the motor into the intake, and the ECM might take
>this into account (or vice-versa).
>
>
>--> Bob Valentine
>--> bob at tecmark.com
>
>