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Originally Posted by Lucky
The drivetrain you need to handle 300hp (really the torque is the determinant, but I'll go with hp since that is your example) will have about 3 times higher loss (versus the 100hp drivetrain) due to higher rotational inertia (heavier gears) and more friction (larger surface area on gears and bearings). Will it be a perfectly linear 15% at all hp/torque levels? No, but it is a pretty good rule of thumb that matches nicely with real-world data.
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Lucky, I follow your example, and would agree, but in Tholyoak's example the car is the same (without a beefed-up tranny). So he does pose an interesting question to ponder.