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What do Underdrive Pulleys do? Underdrive pulley systems increase engine horsepower by reducing the amount of power required to drive external engine accessories. For example, the alternator, power steering, water pump and air compressor rob horsepower from the engine. By replacing factory-sized crank and accessory drive pulleys with a resized pulley, the accessories are slowed, resulting in more horsepower available to the drive wheels. Typically, a set of Auto Specialties street pulleys will increase horsepower by 12-15, and increase mileage by 2 to 3 MPG. All pulleys are manufactured from Billet Steel or Aluminum, exceeding factory quality.
History and information about ASP and their products.
ASP Underdrive pulley systems increase engine horsepower by reducing the amount of power required to drive external engine accessories. Auto mechanics use underdrive pulleys as a replacement pulley that contains a different ratio and material specifications that free up lost horsepower. By using an underdrive pulley, you are increasing the diameter of each accessory pulley and decreasing the ratio of the crank pulley. The speed at which the accessories are turning relative to the engine's rpm's decrease.
By installing a resized pulley, the accessories are slowed. This results in more horsepower available to the drive wheels. Typically, a set of Auto Specialties street pulleys will increase horsepower by 12-15, and increase mileage by 2 to 3 MPG.
Why should you buy an Underdrive Pulley by ASP? ASP has been in operation since 1988. All ASP pulleys are manufactured from Billet Steel or Aluminum, exceeding factory quality. ASP pulleys start out as as a solid bar of either 6061-T6 Alum or 1045-carbon steel.
If you were able to tour the Auto Specialties Performance factory you would be able to see for yourself how intricate and exacting the production process is from the beginning where all of the solid bars have to be cut to size using an automatic saw that can cut within .010 of an inch. Next they are machine lathed with specifications that can be tweaked to as little as .0003 thousandths of an inch for a perfect fit and then any necessary millwork takes place. And for the most important part, quality control procedures are tantamount at the facility safeguards are in place at all stages of the total operation to assure that the customer gets a product that is manufactured to perfection. From this visit it would be easy to see why Auto Specialties Performance (ASP) has been the leader in the underdrive pulley market for twenty years and why they should be trusted with you are in the market for and underdrive part .
The ASP UNDERDRIVE CRANK AND UNDERDRIVE ALTERNATOR PULLEY that is SFI approved racing for your 1998-02 Firebird V8 can give you back some of the much needed horsepower that is stolen by your water pump, A/C compressor and power steering when powered by a factory installed pulley and as a plus you can see up to a 15 percent increase in horsepower with the underdrive pulley system. And for better performance in your Corvette consider the ASP Underdrive Pulley SFI Approved 25% Harmonic DAMPNER Crank for a reduction in crankshaft torsional vibration, greater valve train and timing efficiency and a reduction in wear to the car’s main bearings, oil pump and crankshaft. And if you are on the racing circuit with your Camaro you might be interested in the ASP LT-1 pulley 23% Crank 'Nitride' Camaro 1993-97 V8 with its nitride coating that diffuses nitrogen into the surface creating a much harder surface and more durable product so important considering the rigors of racing.
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slp-headers, high flow cats, y-pipe, magnaflow exhaust, sphon torque arm, sphon tubular sub frame connectors, sphon drive shaft, sphon rear tubular adjustable lower control arms , three inch steel drive shaft rated to hold 1,200 horse power, 4.11 moser 12 bolt rear, short throw shifter, slp flow pac, drilled and slotted bear rotors and ebc green stuff pads on all four corners, 20% tint all around, 90 mm slp mass air flow sensor, and asp 25% underdrive pulley.
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