Quote:
Originally Posted by equ
Rotational inertia should be very small for a driveshaft. Especially the difference between a steel/alloy one vs. carbon, given that there is engine inertia, gears, flywheel, diff, axles, wheels and tires attached. Most of those with a higher radius than the shaft. IIRC, it goes like MR^2, so I'm not even sure why they bothered in the first place.
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Every bit helps. Also, the wheels and tires are past the rear differential so their moment of inertia reflected to the engine would lower by that gear ratio. Still far more than the shaft, of course.
Like I said, I am not arguing that it will make much of a difference, just how they are handling it on the customer side. There are actually some benefits in going to steel. But the replacement cost of the CF shaft is something like $2500 vs. a few hundred for the one in steel. To do a swap without adjusting the cost is kinda crappy, again, considering what a big stinking deal they made of it at launch.