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yeah, this 2.87" pulley is definitely too small. It slips above 6000rpm, even with the special coating. I'm enjoying the big boost in midrange though, for now... At least I'm 100% sure ESS's pulleys are 1/8" milled down at the supercharger end
I don't recommend going smaller than 3.125" like ESS uses, along with a bigger crank pulley. Unless someone can add another idler pulley near the supercharger to wrap the belt around it more, or prove that a mechanical tensioner will reliably allow you to increase the tension on the belt
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