Pristine CTD. Extra cab, short bed, 2wd, SLT. Factory tow/haul package, leather heated seats, heavy insulation package. Rebuilt HX 35/40, Dap injectors, full gauges, PacBrake, Dynamic Transmission vb/servos/accumulator/strut/band/triple disc. Soft tranny lines, 40k trans cooler, lift pump, gooseneck hitch (never used), class 5 tow hitch, tonneau cover, air bags, re- geared to 3.73’s, 3rd Gen brakes with 17" rims Rust free CA truck located in Chico CA, 100 miles north of Sacto. I built this to
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Price: 16000
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Location: Chico CA 95973
Mopar1973Man 9 posts
AH64ID 7 posts
ISX 4 posts
guesswho512 1 post
Everyone seems to know the IAT of a 24V, but I never see anything on a 12V. So I cut the IAT wires, soldered wires to them, ran them into the cab, crimped them onto my multimeter leads, and I was able to read Ohms while driving. I am still working on a calculator to see what temps I am seeing but so far here is what I have personally tested, I just need a way to connect the dots for the calc.
I made a video of the test run. Engine wasn't started so I knew that 77F must have been 10kOhm.
One thing to note is that the computer was smart enough to know it had no continuity in the IAT wire and the WTS light blinked the entire time the key was on.
http-~~-//www.youtube.com/watch?v=Cy2XpWRSvgA
You can see that EGT and IAT have no relationship. You can see that air being compressed (BOOST) is what drives the temp up. At then end of the video there is a short clip of me idling after the run. The IAT is going up steadily because the turbo is hardly pushing any air. This allows the air in the intake to slowly swirl around and pick up heat from the engine itself, causing the air to heat up.
If you look at the table, you see that 116.5F is 4.1kOhms, so I wasn't getting anywhere near it.
Remember, lower resistance means HOTTER temps!
--- Update to the previous post...
Alright I got everything to temps x5 so I got results from 70-100 in the table now. PITA but I wanted to see exactly where it was. From what I can tell, I maxed out around 95 or so. That was almost to the floor when it got there, but only 18F over ambient. I was up to temp by that time but I still want to see what I get on an actual trip that takes longer than 3 minutes, when everything in the engine bay has got to whatever temp it wants to be at.