Underdrive Pulleys

All of the belt-driven accessories in your car, like the water pump, alternator,and power steering pump, are using up some of the engine's horsepower. An underdrive pulley is designed to reduce the amount of energy going to these accessories, which leaves more for the engine. These pulleys have a smaller diameter than the car’s stock pulley. This means they decrease load on the crankshaft at the price of rotating more slowly. Installing a set of these can increase your gas mileage by 1 or 2 miles per gallon! The next time you think about upgrading or doing some mechanical work on your car, why not add a set of these and save on gas.