Thread: Best Pulley
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      11-27-2012, 04:21 PM   #84
First Lieutenant

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Drives: 2008 E90 M3
Join Date: Jan 2012
Location: Mill Creek, WA

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The Rogue and Macht Schnell kits provide a power steering pulley. If the pulley is larger than stock, it serves to further underdrive the power steering pump. If it is smaller, it restores the pump speed somewhat back to the factory specification. I just installed my Macht Schnell pulleys and didn't check to see the size difference.

It is erroneous to say the MS kit doesn't underdrive AC. since the crank pulley diameter is smaller for both belts, it must.