Installing the Underdrive Pulley

[Nine Ball]

Crank pulley has never been a dyno mod, historically, on any vehicle. But, legit gains at the drag strip for sure. Worth about a tenth on slower cars, which translates to a car length.

[Jack B]

My point exactly, just trying to be polite.

Crank pulley has never been a dyno mod, historically, on any vehicle. But, legit gains at the drag strip for sure. Worth about a tenth on slower cars, which translates to a car length.

[Arizona Vipers]

People were asking in this thread the weight of the stock pulley versus under drive.
Stock pulley- 839 grams, 30 oz
IPSCO pully- 484 grams 17 oz
So 13 oz less reciprocating mass. That's worth at least a second off our lap times



ViperPulley-002.jpgViperPulley-001.jpg

[texasram]

The holy grail in car audio amplifiers is one dollar per watt, just wish hp was the same