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Our supercharger was equipped with a 6.00-inch drive and a 3.75-inch driven pulley, so it is 60 percent overdriven. To figure it out, we took the drive pulley, divided by the driven pulley to get the drive ratio and the percentage (6.00/3.75=1.60:1 or 60 percent overdriven). Overdriven simply means the blower is spinning faster than the crankshaft. Underdriven means the blower is spinning slower than the crankshaft. Think about it in terms of the number 1. If your drive ratio is 0.750, the blower is 25 percent under the number 1 and underdriven. If the drive ratio is 1.250, you are 25 percent more than the number 1 and overdriven. Simple, no? View Related Article
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