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Old 07-16-2012, 12:23 PM   #1
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pully sizes

I have a powerdine supercharger and want to upgrade to 9psi, but i dont know what size pully produces 9psi. Anyone have any idea how to tell?
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Old 07-16-2012, 01:35 PM   #2
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Re: pully sizes

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Originally Posted by Supercharged5.0 View Post
I have a powerdine supercharger and want to upgrade to 9psi, but i dont know what size pully produces 9psi. Anyone have any idea how to tell?
A Google search says a 2.9" pulley will produce 9 psi.


Try these links to help you choose a pulley:


Link 1


Link 2
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Old 07-16-2012, 02:01 PM   #3
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So a 2.9 pully will produce 9psi with the crank pully being a 6.5 right?
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Old 07-16-2012, 02:22 PM   #4
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Re: pully sizes

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So a 2.9 pully will produce 9psi with the crank pully being a 6.5 right?
I suppose.
There are too many variables to insure that any given pulley will produce an exact psi in any engine.
Boost pressure is made by restrictions in the engine air flow. If yours is more or less restrictive it may produce more or less boost.
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