88 notch

underdrives are a great invention. under charging alternator and an overheated engine. if you want to fell real underdrives take your belt off and go around the block, feel the power

5Liter Import Eater

Are underdrives really worth the $money$? if so, are any better than others? i have a 130amp 3g PA performance alt, would charging be a problem?

PJB

The underdrive pulley for the alternator is alot bigger than the stock Fox alternator pulley.
Its the same size as the stock SN95 alternator pulley though.

A smaller pulley spins more and therefore charges more than a larger pulley.

Ive got an underdrive pulley on the crank and waterpump and the stock Fox pulley on the 3G alternator.