2 pulley Subaru WRX kit, includes crank and alternator pulleys, and belts. This kit is for the MY01-02 WRX (MY02-03 in the U.S. ? the ?bugeye? model), and does not include the power steering pulley, as on these models it cannot be removed. This set can also be used for Subaru EJ20, EJ22 and EJ25 turbo and non turbo engines.
Install a GFB light-weight under-drive pulley kit and get better throttle response and more power!
How do they do this?
1. Less weight - GFB's pulleys are manufactured on the latest Multi-Axis CNC machines from the highest grade 6061-T6 aluminium billet, making them immensely lighter than their factory steel counterparts.
This lower weight yields a large reduction in the rotating inertia of the belt train, allowing the engine to accelerate faster. The effect is similar to fitting a lightened flywheel and is particularly noticeable in the lower RPM range before the turbo spools up. This is because the power required to accelerate a heavy pulley accounts for a much greater proportion of the available power at low RPM.
2. Under-driving - Additional power increases also come from making the crank pulley smaller, thereby slowing down the accessories and reducing the driven load (particularly at high RPM), without affecting their operation.
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