Quote:
Originally Posted by Occasionally6
Really easy, at least with a manual transmission. Measure the acceleration with an accelerometer and calculate the force required to achieve that acceleration using the mass of the car. Work back from the tires with the gear ratios to find torque at the flywheel. With the engine speed known you can then calculate the power being used.
With a torque convertor between the engine and transmission it's a bit harder to obtain engine power but it will still be possible to find the power from the transmission back.
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You're neglecting the external loads, aero, rolling, road grade.