3SX now offers our own underdrive pulley! Whats the benefit? It is made from CNC 6061 machined billet aluminum and weighs only 1 pound 6 ounces! Way less than the nearly 7-pound stock crank pulley. This means you free up horsepower to the wheels. Available with or without quality belts.
NOTE: If you are running an aftermarket stereo of any significance (external amps, etc), we recommend the 3SX Stock Sized Pulley rather than this underdirve - the underdrive slows down the speed of you alternator (thus reducing its overall charging capacity).
Crank Pulley Comparisons
The crank pulley is the outer pulley on the crank shaft and drives the accessories (alternator, AC compressor, power steering pump) and replacing it with a lightweight pulley is one of the most common upgrades for performance vehicles since its lighter weight reduces drag on the crank and engine, netting more power from the engine. 3SX offers 2 versions - an underdrive pulley that is smaller than stock size to maximize weight reduction and redice the speed of the alternator/AC (thus reduce drag) or a stock sized pulley that offers the same benefits of the reduced weight, but maintains the same size as the stock crank pulley, thus does not down the accessories (which offers only minimal benefit versus the weight reduction from stock).
Horsepower increases from aluminum pulleys are about 10-15, with the difference in the stock size and underdrive being minimal.
NOTE: Available for the 1992-1999 DOHC 3000GT/Stealth. Will NOT work on the 1991 DOHC which uses the V-belt for the power steering and will not fit the SOHC models.
Stock Size Pulley = 18.6-inch around | Underdrive Pulley = 14.75-inch around
Don't wait for THIS to happen...
We also recommend replacing your center bolt for your crank pulley if yours is rounded or split.