Supercharger Pulleys & Overdrive Kits

Supercharger Pulleys & Overdrive Kits

Supercharger pulleys control the rotor speed of the supercharger relative to the engine crankshaft. Smaller drive pulleys or larger idler pulleys increase rotor speed, raising boost pressure and power output. Supercharger pulley upgrades are one of the most cost-effective modifications for factory supercharged vehicles.

Popular Supercharger Pulley Upgrades

Popular supercharger pulley upgrades include overdrive supercharger nose pulleys that directly drive the rotor faster, idler pulley upgrades that add tension and accommodate belt routing for larger pulley configurations, underdrive crankshaft pulley kits that reduce accessory drive parasitic drag, and complete pulley kit packages that include the supercharger nose pulley, idler, belt, and all required hardware for a complete swap.

How much boost does a smaller supercharger pulley add?

The boost increase from a smaller supercharger nose pulley depends on the size reduction and the base rotor speed of the supercharger. Typically, reducing the nose pulley diameter by 10 percent increases rotor speed and boost pressure by a similar proportion, commonly delivering 1 to 3 additional pounds of boost. An ECU tune is strongly recommended after any pulley change to properly calibrate fueling and ignition timing for the new boost level.

What tools are needed to change a supercharger pulley?

Supercharger pulley changes typically require a dedicated supercharger pulley removal and installation tool, as the nose pulley is press-fitted onto the rotor shaft. Attempting to remove or install a supercharger pulley without the correct tool risks damaging the rotor shaft bearings. Pulley removal and installation tools are available as standalone tools or included with some pulley upgrade kits.

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