certainly not logarithmic but its also not a fixed value (i.e., 68hp) either. its more a baseline fixed value plus a percentage for additional hp added. the way to think of it is that friction isn't the only variable here. Rotational and fixed masses play a part as well. To spin a 50lb. drum to 400rpm in 1 minute takes a lot less energy than to spin the same drum to 400rpm in 30 seconds. In other words to get all rotational masses in the driveline (gears, shafts, wheels, brake rotors, etc.) up to speed takes energy, and it takes MORE energy to get them to speed more quickly. The resistance goes up simply because the gears are spinning with greater pressure (normal force), so there is more friction per unit time, which means more work must be done to overcome it. Now, there is no way that there would be over 200hp worth of of frictional losses just like TMac points out in the above post but there WILL be more than the 68hp loss at stock power levels.
That's really not the case with 10r80 because it is a lock up style torque converter and a relatively efficient transmission in fact if we were dynoing only through the rear wheels I would expect to see stock numbers around 360.
In this case you're probably on the right track saying that if the drivetrain loss is 68 horsepower it's probably going to stay relatively the same. But I don't think through any of this anybody was saying anything about crank horsepower numbers because in my opinion nobody really gives crap about crank horsepower numbers.
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