Our pulleys are made from T-6061 aluminum and finished in a durable black hard anodize that is very resistant to wear, chemical exposure, and heat. Our pulley kits have been on the market for over ten years, and used in all of our own cars, with zero component failures related to their use. On our Racing pulley kits we actually underdrive certain components more so we feel our Street pulleys are an ideal compromise between power/torque gains, reliability, and system performance. There's also a small but noticeable improvement in throttle response too! We have done extensive testing and development work, both on and off the track, to ensure that the accessory systems function as they should. Our pulleys give a 5-10% reduction in rotation, releasing up to 11hp on most BMW six-cylinder engines. Since less energy is used to move them, that power is transferred back to the engine and used to propel the car. These systems contribute to 'parasitic losses' - power lost from what the engine could produce if it did not have these systems. Underdrive pulleys for your BMW will slow down engine-mounted accessories - the water pump, power steering pump, and alternator*.
#G POWER E46 330I FREE#
By giving some of that power back to the engine, you can make the car faster! It's like FREE HORSEPOWER! That's power that could otherwise be used to move the car. Any accessory that spins from the main drive belt is using up power. Underdrive Power Pulleys work to 'free up' horsepower.
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