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There's a torque model/capability table in the ECU (at least one). There are then various tables which explain how much torque is wanted at different engine speeds and accelerator pedal positions. Through some transformation with ratios etc it ends up on a table which converts the torque demand vs capability into an end throttle butterfly angle.
Unfortunately it doesn't quite work as you'd expect and there is some behaviour you can't get rid of, yet, with the tools currently out there. I've only confirmed this with brzedit, but i've heard similar from other platforms.
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