As part of my process, I wrote up a file that outlines my understanding of the torque-management process... kind of a flowchart with no graphics. Maybe it'll help others who are trying to learn this, and I'd welcome any input from the 99% of folks out there who are more knowledgeable than I am!
Code:
1. Driver presses gas pedal down a certain amount.
2. Gas pedal position & engine speed are used to look into "Percent torque request" table.
Tables for AT are [ECM] 29328/29329/29371 ("Low"/"Low Sport"/"Offroad"), 29330/29331/29372 ("High"/"High Sport"/"High Offroad")
Blend betwen "low" and "high" comes from speed/gear tables 29368/29369 ("Blend"/"Offroad Blend")
Regardless of which table or blend, WOT should always yield a value of 100%
2a. Monitoring tables (for AT) 29332/29333/29334/29373 ("Base"/"Sport"/"Sport 2"/"Offroad") check the % from step 2.
3. Percent from step 2 & gear are fed into (AT) tables 29542/29556 ("Max Torque 0"/"Max Torque 1")
Output is requested torque
3a. Requested torque is monitored(?)/capped(?) by 29613 ("Max Torque at Clutch")
3b. IMPORTANT? Visible in advanced view only is 29572 "Max Torque Limit at Full Load"
3c. Torque can also be limited by transmission?
4. Requested torque from step 3 & RPM are fed into 29523 ("Indicated Torque to Aircharge")
Output is an aircharge value
4a. 29540 ("Indicated Aircharge to Torque") uses airflow and RPM to compute torque
Not sure what this is used for?
4b. 29520 ("Max Airflow vs. RPM") caps airflow based on RPM?
What I don't know is what the ECM dows with the aircharge number from step 4?
29480 "Supercharger Volumetric Airflow vs. SC RPM" seems to relate supercharger RPM (presumably calculated from crank RPM) and pressure ratio to airflow.
But the numbers don't make sense... airflow increases with RPM as expected, but decreases with pressure ratio?
Maybe that table shows airflow per revolution of the supercharger (so need to multiply by RPM to get actual airflow)?
29524 ("MAP Limit") and 29481 ("PR Limit") can limit manifold pressure.