Quote:
W8MM said:
Quote:
TB993tt said:
- my observations (involving going 4WD to 2WD with the same tuned 540hp engine (993tt)) is that the lack of drag from having to wind up all the 4WD shaft and mechanism is worth around 40 FWHP.



It is probably higher than 40hp. Drivetrain losses are usually calculated as a percentage, with 15-20% typical for a 2wd manual system. For 4wd and automatic it could be much higher

Wow!

I would never have guessed that there was so much rotary inertia involved in a drive shaft, two half-shafts, and an extra differential, or two.