To control and force the PCM to have a much cooler Intake Air Temp (IAT) the design I have designed allows you to dial in what temp is being told to the PCM.
It's lying as to real temp but PCM does not know that and adjusts fuel trim and timing for bogus temp number.
By setting a resistance value, converts to a temp number and that is feed to the PCM as being the real airtemps.
This allows you to tune the fuel trims and engine timing.

The 10K pot mainly is used between 4.5 and 5K ohms which equal 45 to 78 degrees.
Thus middle of dial would be 5K ohm and 78 degrees.
Each 100 ohms from 4.5K equals 7 degrees.

If a pot is not wanted, replace it with a set known resistance value but be aware you then cannot adjust on the fly and have to manully change resistor value.

With the circuit below, when switch is turned off the stock IAT sensor is functional.
When switch on, the the pot is functional.



I have built and tested this IATuner and it works very well, in fact WOT timing gained 3 degrees by using this circuit

[ 07-11-2001: Message edited by: teamzr1 ]

TeamZR1. Since I have a 01 Z06 the IAT is in the MAF sensor. I don not know if they use the same method of measuring the outside temp. Would the same circuit apply? also where is a good place to find the wiring Scehmatics for my car?

Thanks

You can use the same circuit as I designed for your C5.

Your MAF connector has 5 wires, the 1st 3 (Pink,Yellow and Black) wires are for the MAF.
The two dark wires at the other end of connector are the IAT sensor.
You would cut those two wires and then splice in the IATuner and it will work the same as on my '99.
If you have a PCM scanner, you could have it scanning with key on, have it show the IAT and as you adjust the IATuner resistor pot you can see the position of the pot knob what the IA via the scanner.
Mark the pot knob at the different temp readings of scanner so now all you have to do is turn pot knob to a mark and know what the IAT value is.

John

Thanks. Great site. Love the No WAX Test!! I am going to get a EASE soon. So I can get a baseline of where I am and then go from their.

Jason