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The Helix supercharger pulley is the best performance bang-for-the-buck, period. The reduced pulley size allows the supercharger to spin faster in relationship to the motor, pumping more air into the motor and increasing power.
In an otherwise stock Cooper "S", the pulley increases boost pressure by 3-4 ft/lbs, increasing horsepower and torque. In a car with other engine mods like intake and exhaust improvements, boost is increased to a maximum of 5 ft/lbs.
The factory software settings keep the fuel/air mixture only slightly leaner than stock -- still very rich -- so there is no risk of excessive heat buildup, even under prolonged track conditions. All of the factory emissions equipment including catalytic converter, and oxygen sensors work normally with the pulley upgrade.
The 2-part modular pulley includes a high-tensile carbon steel (70,000 ft/lb) hub which presses onto the supercharger shaft, just like the factory system. The aircraft aluminum pulley then bolts onto the hub, allowing the user to interchange pulley sizes, including returning the pulley size to stock. Swapping the pulleys takes about 30 minutes and requires the MINI belt tensioner tool and a 4mm allen key.
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