Originally posted by Augi:
Well, it does sap horsepower if it locks up.



Originally posted by Augi:
that is what the U/D pulley is for, to reduce the strain on the crankshaft. Same principles as this. reduce strain on the crankshaft by removing a pulley/ gain up to 4hp which isn't much at all, but the and then some means more than none.


The Underdrive pulley run runs accessories at a slower speed, it doesn't reduce tension or strain. This is much different from removing a pulley. While it's true that having to spin a pulley that should be freely turning takes some power due to the moment of inertia of the pulley itself, I'd be willing to be it is literally fractions of a horsepower. Like baaaaarely any at all.

"Mod your car tastefully because other people have to look at it." -Me