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The dyno argument is invalid because two completely different systems are being measured.
On a dyno the rotational inertia of the driveshaft makes up a larger part of the total inertia because it is being used to accelerate the roller.
In real life, it's accelerating the whole car.
Try mashing the gas in a fifth-gear pull from the same starting RPM as when on the dyno. Which one gets to redline more quickly?
The driveshaft is a tiny little part of the combined inertia. Please let it go.
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