The IAT (intake air temp) and the MAT (manifold air temp). Is it exactly like it sounds? Does both speed den. and maf use both? or is one for maf and one for speed den. Thanks alot for the help, jimmy

 

I beleive it is interchangeable terms for the same thing. I do not recall seeing both on the same engine anyway........

 

One in the same part. Technically on a TPI with the style used, its more of a MAT than IAT but you could call it either one and its close enough. Theres just one on the car, in the bottom of the plenum

The coolant temp sensor is also an identical part if your MAT/IAT sensor is not the open style, which on TPI cars I have seen its not. Its in the front of the intake base. Only ones I think used it stock were the 2.8 V6 FI's.

Same same SD or MAF as well.

 

I agree with the others, that you can use the terms interchangeably, but MAT is the correct technical term. The biggest difference is more between how MAF and SD cars utilize them. Only SD cars use the MAT to effect the fuel correction of the mixture (i.e. lower temps increase fuel/higher temps decrease fuel). On MAF cars, the MAF itself does the correction for intake air temp (cooler air measures more flow at the MAF).

Relocating the MAT on a MAF car is probably the most useless modification there is. Something those companies that sell MAT relocation kits fail to mention in their glossy brochures. In the ENTIRE eprom for MAF cars, the only time the MAT is looked at is when it tries to determine if the MAT temperature reading is sufficent to turn on the EGR. That's it.

And, for SD cars, if you relocate the MAT you MUST recalibrate the MAT tables in the eprom if you want the fuel to be correct. Otherwise you are going to run pig rich. Another overlooked fact by all those companies that sell relocated MAT kits.