iat sensor

[saru]

Hi,
I have a question about were to put the iat sensor . I have a 390 cube Caddie V8 GMC blower 8 injectors under the blower,one at each port,
4 injectors top side in the bug catcher .The best place to put the iat sensor,over the blower,under the blower,infront of the butterflies,behind the butterflies?
Any help would be great.
Thanks

[Matt Cramer]

Under the blower is better so it can measure how much the blower heats the intake charge.

[saru]

Thanks Matt,
That sounds like the right place,but I've heard stories about heat soak, that's why I asked.
Thanks for the help.

[Matt Cramer]

Heat soak can be a nuisance, but it beats missing the temperature rise from the blower.

[saru]

Thanks Matt!

[coyoteboy]

Heat soak is, for me, a massive problem with the IAT sitting in the throttle body. Once the car has sat at lights for more than 30 seconds I don't ever see temps <35c until the engine has cooled. I'm fairly sure the actual air temp is lower for reasons I'll explain in a minute (comes through an over-sized water to air chargecooler and the throttle is a long way from the head) but the body of the manifold and sensor is almost too hot to touch - I think this conducts along the sensor body. This can cause a shift of AFR of 1-2 at idle, which makes tuning idle virtually impossible. If the sensor is reading 50c and the air is 25 I'm running really lean. So I tune for the cold scenario but often end up almost pouring fuel out the exhaust when it's actually hot and have problems with flooding on hot restart. But I have no choice as it can't be anywhere else.

My question is how do the OEM's account for this as this is where their sensor goes. It can't be coolant corrected as I can have 90c coolant and 10c air, and 90c coolant and 60c air. Royal PITA.