What is it you're trying to observe?

If it is torque requested than you look at throttle position because, well, the throttle is how you request torque

Torque delivered is very tricky because there are a lot of variables to include. To make your life easier the DDE does all the calculation and provides you with a calculated torque figure through one of the PIDs available via OBD.

I go back at say that being a diesel engine, rail pressure is a better indicator of torque delivery since conceptually a diesel engine throttle fuel not air. And rail pressure is the primary way to do that.

HOWEVER it isn't that simple.
1) you have EGR duty cycle (2 of them) affecting it
2) you have pilot injections affecting it
3) you have boost and turbo switch over
4) you have torque management to protect the transmission

Unless you correctly factor those and many other variable in your analysis, you won't get a good sense of the torque output... That's why if that's what you're after, the calculated torque PID that the DDE reports is a better value to observe. It is calculated and by that it means that the DDE has done the math for you given all the parameters it is controlling.

In the old gasoline engine with manifold injection you look at TPS and figure load. Now even gasoline engine with variable valve lift, boost and stratified injection you can't simply look at MAP and asses load...

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