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| In stock: In Stock | |
| Manufacturer's website: http://www.gofastbits.com.au | |
Description
3 pulley Subaru kit, includes crank, alternator and power steering pulleys, and belts. Suits MY03-07 (MY04-07 in USA) Impreza, WRX, STi, Forester & Liberty/Legacy.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. How much lighter? It depends on the particular model, but on average the weight saving is around 2kg. The GFB 300ZX pulley on the other hand saves over 7kg!
This significantly 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).
Does this affect the accessories? No. All driven accessories operate at full efficiency somewhere between idle and 1400RPM. Above this peak efficiency RPM, the accessories simply waste power. At low RPM, the under-drive ratio has little effect, so battery charging and power steering are not compromised. However, as the revs increase, the under-driving proportionally reduces the amount of wasted power.
**If you have a colour preference, please check with us first to make sure it is available**