So a bit of backstory-
Using an LS PCM in ways Delphi never intended.
This link has a ohm to temp chart for the GM temp sensor, which is the same from 1985ish to deep 2010's.
And this is how to install an external trans temp sensor on like a th400. 60/80e's have a sensor inside the trans pan. This person actually used a GM ECT and just tapped it into the harness to the Red 51 and Blue 41 pins.
I figured a trans temp input is a temp input, and looking at the resistance ranges the GM trans temp from a 60/80e curve is the same as a ECT, and since I have a t56 I can 'upcycle' that temp input into whatever temp input I want.
But knowing my luck-
For the life of me, HPtuners would not change the trans temp in the scanner, it only logged voltage. No worry. If I have learned anything in 6 years of engineering schooling and 4 of industry it's how to run Excel lol.
And why did I have to do it this calibrate myself way? Well, there is something odd and Ohms law wasn't working. With constant current supply of 0.014 amp which is what I measured at multiple temperatures, and known resistance, it should be easy to find the voltage. It SHOULD have output volts in a normal 0-5 range, but the case here obviously is not working. Not sure why. These sensors don't have a linear temp to resistance curve either. There is something in the system I don't understand. I almost called my EE buddy but decided to brute force it.
Obviously Ohms law assumes a linear relationship between voltage and resistance, but the calibration I did above is obvious that the voltage response is roughly cubic, so I don't know what's up. Regardless it's working and now i need to hard wire everything in.
Using an LS PCM in ways Delphi never intended.
This link has a ohm to temp chart for the GM temp sensor, which is the same from 1985ish to deep 2010's.
4th Gen LT1 F-body Tech Articles
shbox.com
And this is how to install an external trans temp sensor on like a th400. 60/80e's have a sensor inside the trans pan. This person actually used a GM ECT and just tapped it into the harness to the Red 51 and Blue 41 pins.
How to add a Trans temp gauge to your ECU for non for non 4l60e/4l80e Transmissions - LS1TECH - Camaro and Firebird Forum Discussion
Conversions & Swaps - How to add a Trans temp gauge to your ECU for non for non 4l60e/4l80e Transmissions - On 4l60e and 4l80e transmissions the transmission fluid temperature sensor is housed in the manifold pressure switch, this sensor is built in and non-removable. However this sensor shares...
ls1tech.com
I figured a trans temp input is a temp input, and looking at the resistance ranges the GM trans temp from a 60/80e curve is the same as a ECT, and since I have a t56 I can 'upcycle' that temp input into whatever temp input I want.
But knowing my luck-
For the life of me, HPtuners would not change the trans temp in the scanner, it only logged voltage. No worry. If I have learned anything in 6 years of engineering schooling and 4 of industry it's how to run Excel lol.
And why did I have to do it this calibrate myself way? Well, there is something odd and Ohms law wasn't working. With constant current supply of 0.014 amp which is what I measured at multiple temperatures, and known resistance, it should be easy to find the voltage. It SHOULD have output volts in a normal 0-5 range, but the case here obviously is not working. Not sure why. These sensors don't have a linear temp to resistance curve either. There is something in the system I don't understand. I almost called my EE buddy but decided to brute force it.
Obviously Ohms law assumes a linear relationship between voltage and resistance, but the calibration I did above is obvious that the voltage response is roughly cubic, so I don't know what's up. Regardless it's working and now i need to hard wire everything in.
