IAT relocation?

hotmustang331 · Jul 9, 2005

Was wondering exactly where it is at? And what it looks like, and what is need to relocate it to inside the fender so it doesnt pull too much timing by measuring underhood/intake temps.....................................OR a way to "trick" it into thinking its like 50* outside all the time....I prefer option 1 due to it being safer. And I will be getting a tune in probably a few weeks. THANKS IN ADVANCE.

Mustangl3 · Jul 9, 2005

when your standing in front of the car i think its the sensor located in the front left of the intake. it screws down into the intake. I dont kno if you would want the computer to think the intake temps are much lower then they are because if it gets too hot the computer wont retard the timing and there could be detonation.

Just to see what would happen my friend got an extra IAT sensor for his '90 lx and put it in a bag of ice and when we tried to start it flooded really bad. So you really dont want it to cold either.

Superhereaux · Jul 9, 2005

'o2's and up have them built into the maf sensor

you can't move them

hotmustang331 · Jul 9, 2005

Thanks! I really was wanting to prevent heat soak...so yea cold would be a bad idea LOL....it will still see outside temps, but wont be getting extra heat from the motor. I have a ram air that will be blowing outside air on the filter (planning on getting a JLT). I just dont want it pulling timing for no reason LOL.

DANG! Well is there any way to seperate it from the MAF? Is it just a probe that I can pull out? Or is it a molded in design that is not able to be sepearted.

Mustangl3 · Jul 9, 2005

My friend's dad had this idea:

We figured the computer measures the resistance that the iat sensor has and the resistance changes as the temperature changes.(im not positive if this is how its actually set up) If this is true you could measure the resistance of the iat sensor at the desired temp. and then unplug the sensor and jump the connections with a resistor. Or you could get a potentiometer(which is a variable resistor) that puts out around the same resistance range as the iat sensor and be able to adjust it in case the intake temps are getting too hot to prevent detonation.

Im not even sure its a good idea to mess with the iat. Newer cars dont really seem to run a lot better when they are cold anyway, but it may be worth it to make the computer think the temps are cooler because i think it gives it more fuel when its not warmer up. I would like to know exactly how the sensor works and what changes as it warms up and at what temps things start to change.

cold96snake · Jul 10, 2005

hotmustang331 said:
DANG! Well is there any way to seperate it from the MAF? Is it just a probe that I can pull out? Or is it a molded in design that is not able to be sepearted.

Yes, there is a way. I believe Randy at Modular Depot can help you out. He sells a kit.

Pearl02 · Jul 10, 2005

Mustangl3 said:
My friend's dad had this idea:

We figured the computer measures the resistance that the iat sensor has and the resistance changes as the temperature changes.(im not positive if this is how its actually set up) If this is true you could measure the resistance of the iat sensor at the desired temp. and then unplug the sensor and jump the connections with a resistor. Or you could get a potentiometer(which is a variable resistor) that puts out around the same resistance range as the iat sensor and be able to adjust it in case the intake temps are getting too hot to prevent detonation.

Im not even sure its a good idea to mess with the iat. Newer cars dont really seem to run a lot better when they are cold anyway, but it may be worth it to make the computer think the temps are cooler because i think it gives it more fuel when its not warmer up. I would like to know exactly how the sensor works and what changes as it warms up and at what temps things start to change.

That was a old "trick" that some of the guys did at www.rangerpowersports.com to make the trucks run better. The IAT wasn't built into the MAS. I causes the engine to add more fuel and timing. If you did do this you would have to run a higher grade of gas. I don't know how well this worked. You could buy some kits on Ebay or build your own to do this. Pearl02.

Mustangl3 · Jul 10, 2005

So it would be beneficial at least at the track, but if the intake temps were really too hot then you wouldnt want to mess with it right?

hotmustang331 · Jul 10, 2005

Hmm, so cold it adds fuel (thinks the air is denser and is leaning the A/F, so it adds fuel), my car is INSANELY lean right now, so putting it in the fender may help some. Ill shoot rand shivcomb or however its spelled a PM and see how its done, thanks. Oh and mustangl3, if its in the fender its just picking up ambiant temps and is not being fooled into thinking its hot outside. If its really hot out there, then it will still pull timing, but if its ice cold, it should add some fuel and timing. Once you get going, the air will cool down the inatke track, but what happens is the IAT sensor is heat soaked and continues to think its super hot and keeps the timing pulled for longer than it should, by the time it starts to cool off your 1/4 run is over with LOL. Relocating it keeps the temp about constant and prevents false readings. The motor will also heat up the MAF housing, so its probably reading overly hot all of the time anyways....really the whole intake tube is pretty hot, but the air inside shouldnt be effected that much at WOT, since its pull in a large volume. Its just pulling timing for nothing.

jstreet0204 · Jul 11, 2005

hotmustang331 said:
Hmm, so cold it adds fuel (thinks the air is denser and is leaning the A/F, so it adds fuel)

The eec has the ability to do this, BUT the stock tune has ones placed in all of the values for the the fuel_multiplier_vs_ACT function. Meaning on a stock tune it doesn't add fuel. At least this is the way it is on the CVAF1 strategy for a 99 GT. It could have changed in later years but I doubt it. You can change this with a tune though, and many do for sc applications.

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