Does anyone know where our stock IAT sensor is located? I purchased the Auterra dyno-scan software and OBDII interface cable for my palm pilot and it lets me look at real time readings from numerous sensors including the IAT sensor, and I was curious to know where it's located so I can do some datalogging on intake air temperature in different driving conditions with the turbos.

Another very interesting observation. I'm on a completely stock cooling system in my car and tooling around beating on the car in temps between 55 degrees and 75 degrees for the past few days I rarely have my coolant temp go over 200 degrees F. It mostly stays in the 190 range and spikes a few degrees if I do a pull through a couple gears. I would have thought that my car was running hotter than that with the stock cooling system.

 

IAT is taken from the MAF sensor input. There is no dedicated IAT sensor.

If you make a few brief street pulls, especially in gears 1-3, you typically dont see much of a temp spike. If you do a 5th to 6th gear pulls, you will see temps rise.

 

I had a feeling the sensor was probably part of the MAF...good stuff. So even under boost my IAT temps only rise a degree or two. The intercooler must be pretty efficient.

As for the coolant temps. I did notice the other day on the dyno in 5th gear that the temps would start around 195ish and get to around 220 by the end of the pull. Although it's not really indicative if what would happen in the real world since the wimpy little dyno fans can hardly simulate the airflow past the radiator @ 150mph (end of 5th gear). So if I'm only getting that high on the dyno...my car should have no issues on the street unless I'm running it out to the rev limiter in 6th gear on a regular basis.

 

Happy Late Birthday Brian

-Mike

 

You're not late...it's not until Wed the 17th How's OK treating you?

 

Your experience is similar to mine. Gears 1-4 dont show much of an increase in coolant temps. 5th and 6th are the killers.

An upgraded radiator is about $400, and drops in.... so might not be a bad safety measure.