I am really sorry to tell you...

But you really do not want to use a GM 8-Speed transmission (They are complete piles of crap).

 

In addition, they are controlled by proprietary canbus messages. Very different from the 4L80e. No similarities in the code.

 

No intention on using the GM 8 speed, Im interested in the Aisin Transmission AA80E

 

I've updated the video on the first page.

 

I have looked at the Calculation in the section of Arduino code posted in 2019. I am trying to figure out what slope was used and why you cannot calculate the PWM based on a linear graph. Could you let me know. you could message me at davespeece@gmail or reply here. I don't check this site very ofter but I am interested in building a test harness for my 4l80 since my FiTech transmission controller or transmission is having issues.

 

Line pressure is linear. In the code below, 153 duty equals the minimum line pressure (60% duty). The maximum line pressure is 0 duty. All numbers are integers.