Turner Motorsport Power Pulley Kit - M54 Bosch Alternator Pulley

Part of the process of building a proper race car is to delete and simplify portions of the wiring harness. This not only saves weight and reduces complexity, but it also allows you to run a smaller, lighter racing battery. So why is your alternator still charging at the original rate?!? This M50/M52/S52 racing alternator pulley underdrives the alternator more than our standard Power Pulley, freeing up horsepower and reducing alternator wear. This pulley is over 80% larger than the original stock pulley. With less electrical load, you don't need the original alternator output anymore. You can drive the alternator less and return that "lost" horsepower back to the engine. This part is an upgrade to the alternator pulley already included in our Power Pulley kit and was developed and race-proven on our E46 Touring Cars.

Because this pulley is so much larger than the original (80%), special care will need to be taken so that it does not interfere with other components on the engine - power steering lines, oil cooler lines, coolant hoses, etc. The upper idler pulley is no longer needed with the racing pulley and will be removed. A new belt is required (add one from the options below).

For Bosch alternators only.

The remainder of the Turner Power Pulley Kit is required (water pump and power steering pump pulleys).

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