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Here are some of my logs with a power FC. This is accelerating through the gears. Notice when TPS held constant, RPM rising, duty cycle either moves up or stays about the same- never drops.
It isnt inversly related to anything though. It just goes by whatever the ECU tells it to do. Usually, more airflow = more horsepower = more duty cycle. if anything you could say duty cycle is directly comparable to horsepower output, but even that falls apart once you consider brake specific fuel consumption getting worse and worse as the engine richens up for power delivery.
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