AEM Tru Power pulleys are made from CNC machined 6061 T-6 billet aluminum to increase horsepower and engine response without the need to remove the torsional vibration damper or emission control devices. AEM Tru Power Pulleys are lighter in weight and larger in diameter slowing down the power steering and alternator, reducing the amouny of energy needed to drive them. Significant horsepower gains can be realized with this simple to install package with no recorded effect on emission levels. Each application includes both power steering and alternator pulleys and high performance custom-fitted belts. Available in anodized red, blue, or silver.
Made form billet aluminum and anodized in blue, GReddy Pulley kits reduce reciprocating mass as well slow down accessories. Decrease engine drag while increasing the engine appearance. Labeled with the GReddy Logo, these overdrive kits do not alter the main crank pulley.
Lightweight Crank Pulleys reduce parasitic drag placed on the crankshaft by underdriving the accesories such as Alternator, Power Steering and Air Conditioning. Underdriving slows down the accessories to use less energy from the crankshaft but doesn t slow them down to the point the accessory operation becomes effected.
Most of the power gains are produced from the lightened weight of the crank pulley. Tests show that an average of 2.7 HP is gained from every pound of weight that is reduced from the crankshaft.
Our pulley sets provide most of the power gains through weight loss (80-85%). The remaining part of the gains from these pulleys comes from underdriving of all the accessories (15-20%).
However, we do not push underdriving for two main reasons. First, it is important to keep charging systems, air conditioning, power steering, and water pumps moving fast enough for every day driving. Second, not much horsepower is gained from extreme underdriving.
In most applications all of our underdriving is done with the crank pulley, not the accessory pulleys. This is done so maximum weight loss can be achieved at the crank where most of the horsepower gains are found.
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