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      10-06-2012, 09:41 AM   #2
ajohnson300
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Drives: 2008 335I, 2007 X5 4.8i
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Great question man, but here is the deal. With the magnetic clutch, the clutch assembly freely spins until power is sent to the magnets, which energize causing the clutch gears to engage. Without the power, the clutch assembly is free to spin, which does not rob or require power. But under load the signal is sent, the assembly engages and now the supercharger spins. You are aware that superchargers require power to make power, so this is why so many lean towards turbos because they don't. They make power from exhaust which was being expelled anyway. But most superchargers are very reliable which is a sell for some. To recap, the gears spin freely until engaged, they are belt driven but are not always on. Hope this helps.