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Discussion Starter #1
If belt slip is present, which pulley is more than likely the culprit? Crank or Supercharger? Or are both equally likely to slip?
 

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The S/C pulley because it is the smallest in diameter and thus has less contact surface area than the crank. Also the S/C is the biggest load on the belt.
 

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best to go with a larger lower so that you can also go with a larger upper, benefiting from more surface area on both.
 

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The actual cause of the belt slip isn't the pullies, it's the tensioner. I found this out the hard way. The right tensioner can eliminate all slip in many cases - basically, under 1,000 hp and at least an 8 rib belt, if you have belt slip look into the tensioner. I have no direct experience above that number, but I suspect you can go higher.
 

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Discussion Starter #6
What is a good tensioner to get? I just have the stock vortech tensioner that you tighten with 1/2 drive ratchet

The actual cause of the belt slip isn't the pullies, it's the tensioner. I found this out the hard way. The right tensioner can eliminate all slip in many cases - basically, under 1,000 hp and at least an 8 rib belt, if you have belt slip look into the tensioner. I have no direct experience above that number, but I suspect you can go higher.
 
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