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Old 08-07-2009, 07:54 AM
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Divide the number of teeth on the driving (crank) pulley by the number of teeth on the driven (blower snout) pulley, like this...

Crank pulley = 45 teeth
Snout pulley = 39 teeth

45 / 39 = 1.15 or 115%

In the above example you are driving the blower at 115% of engine speed, so the blower is 15% over-driven. If you wanted to reduce boost you could swap the pullies, and then you would have...

Crank pulley = 39 teeth
Snout pulley = 45 teeth

39 / 45 = .87 or 87%

In this example you are driving the blower at 87% of engine speed, so you are 13% under-driven.
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