GFB – Pulley Kit – Subaru Impreza WRX/STi Forester Legacy Liberty MY03-05

SKU: 2864
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$593.00

Revitalize your vehicle’s performance with the GFB light-weight under-drive pulley kit, engineered for enhanced throttle response and power. Crafted from premium 6061-T6 aluminum billet using cutting-edge CNC machines, GFB’s pulleys are significantly lighter than factory steel, reducing weight by an average of 2kg, with the GFB 300ZX pulley saving an impressive 7kg.

This weight reduction minimizes rotating inertia, accelerating the engine faster, particularly in the lower RPM range. The under-driving feature further contributes to power gains by reducing the crank pulley size, optimizing accessory efficiency without compromising battery charging or power steering. Tested against the factory controller, the Atomic Boost Controller delivers remarkable gains of up to 18kW (23.4hp) at the wheels, providing early boost rise from 1700RPM without exceeding the factory peak boost level.

Ideal for MY01-02 WRX models, the Atomic or Reactor boost controller ensures a lively driving experience. Elevate MY03-07 Impreza, WRX, STi, Forester, and Liberty/Legacy with the 3-pulley Subaru kit, available in Red, Blue, and Silver, offering the best “bang-for-your-buck” modification for dynamic driving.

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Description

Upgrade your vehicle’s performance with the GFB light-weight under-drive pulley kit, designed to enhance throttle response and power. Crafted from premium 6061-T6 aluminum billet using state-of-the-art Multi-Axis CNC machines, GFB’s pulleys are significantly lighter than factory steel counterparts, resulting in an average weight reduction of around 2kg, with the GFB 300ZX pulley boasting an impressive 7kg saving.

This substantial weight reduction minimizes the rotating inertia of the belt train, enabling the engine to accelerate faster, especially noticeable in the lower RPM range before the turbo spools up. Similar to a lightened flywheel effect, the reduced weight ensures optimal power utilization at lower RPMs.

Furthermore, the under-driving feature contributes to additional power gains by reducing the crank pulley size, slowing down accessories, and decreasing the driven load at high RPM. This adjustment does not compromise accessory efficiency between idle and 1400RPM, preventing any impact on battery charging or power steering. As RPMs increase, the under-driving proportionally reduces wasted power, resulting in remarkable power gains without increasing boost levels.

For an in-depth comparison, the Atomic Boost Controller was tested on an MY02 Subaru WRX with a turbo-back exhaust against the factory controller. The dyno graph illustrates the Atomic boost curve (green) outperforming the factory curve (blue), delivering notable gains of up to 18kW (23.4hp) at the wheels, especially in the lower rev range. This early boost rise, as early as 1700RPM, enhances acceleration without surpassing the factory peak boost level.

Notably effective for MY01-02 WRX models due to their conservative factory boost mapping, the Atomic or Reactor boost controller ensures a lively driving experience. Elevate your MY03-07 (MY04-07 in USA) Impreza, WRX, STi, Forester, and Liberty/Legacy with the 3-pulley Subaru kit, encompassing crank, alternator, and power steering pulleys, along with belts. Available in Red, Blue, and Silver, this modification provides the best “bang-for-your-buck” for a dynamic driving experience.

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