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filling a histogram

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How are you adjusting manifold pressure while maintaining RPM to fill the histogram?

To hold the RPM, you use left-foot braking. To increase the manifold pressure you open the throttle by depressing the accelerator pedal.

On a load-controlled dyno, we can setup the dyno to hold a specific RPM or speed. This allows reaching all the load points above the minimum required to reach that RPM.