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duff: "you just have to ask the right questions"
Then maybe I should start with this question: what's the right question that you think I need to ask that I haven't already asked?
"you car should have one?"
Yes, my car has a TPS.
"you can map out the A/F ratio which may help find efficient vs inefficient operating regions."
I don't know what you mean.
The trick is to create a BSFC map, or the equivalent, without the use of a dyno. I don't know how to do that, but maybe you do.
To assess "inefficient operating regions," I have to do more than just know the throttle position, and the AFR. I also have to have the engine under a known load, so I can maintain a steady state and monitor how much work is being done per unit of fuel consumed. Dynos were invented to solve this sort of problem.
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