[Diy_efi] tuning question

[Michael Richards]

If you have a clip-on type IAT then maybe you would try installing a GM 
IAT sensor as they protrude into the airflow a bit and react fairly 
rapidly to changes in temp. Beware of the bluestreak knockoffs. I just 
had the sensor element break off on a turbo car and it must have gone 
through the engine! The GM one is designed so this can't happen.

-Michael

> Yes. The engine and the IAT sensor get pretty hot when
> idling. It's the steepness of the curve from ~68 to
> ~90 that may be causing some variation. Pretty tough
> to control IAT on the road.
> 
> On top of this I think I am getting some heat soak. I
> have an aftermarket air kit with a thick aluminum
> backing plate which bolts to the cylinder heads with
> some good size aluminum standoffs and guess what, the
> IAT sensor is mounted through this plate, and only
> sticks out less than 1/2". I have noticed that on a
> given ride over time as the engine heats up, the IAT
> also goes up several degrees. This is happening at
> road speeds greater then 50 mph. One would think at
> these speeds with good air flow it shouldn't go up
> much. I think I've got another IAT sensor. I will try
> just clipping it on a better spot.

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