Originally Posted by BrianBrave
Steve - Take a look at the pictures in my gallery under IAT Gauge. I just installed my IAT Gauge and noticed the same thing.
It looks like your coolant temps may read a bit lower then the intake air temps. We will need to do some more comparison.
When driving around town (stop and go) the IAT were 35 - 45 Deg above the OAT. - They would jump when at a stop and take a bit longer to cool down once moving.
When cruzing on the freeway - 65 to 75 MPH the IAT's were pretty constant at 25 - 35 Deg above the OAT. I thought they would be much higher.
I hit a 5-6 mile climb from 600' altitude to 3,700 and was on it - keeping the boot gauge at 12-16 lbs as best I could with the traffic and the IAT rose to 135Deg - that was the max reading I saw. But one off the boost and just cruzing - temps dropped right back down.
Some of our temp differences is probably because we are reading temps from different locations and one being air (if I understood you right) and the other being coolant. Where the coolant probe is on my HE, it should be reading the temp of the coolant returning from the I/C, I was really surprized how fast the coolant temps raised when I was getting into it for a few minutes playing around town. They went from mid 80's to 115-120 in no time. Just crusing town I too thought that the coolant temps in the HE would be a lot higher than mid 80's, but they stayed right there and steady as long as I wasn't getting on it. Since I don't have a boost gauge, I need to set something up that lets me know when the S/C is engaged.