C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Pulley sizes

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Old Mar 19, 2011 | 06:59 PM
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From: POQUOSON va
Default Pulley sizes

I currently have a 3.25 diameter pulley on my blower. The small pulley is pushing way to much psi for my stock motor, what size pulley is about 4-5 psi?
Thanks,Brandon
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Old Mar 19, 2011 | 10:14 PM
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Maybe a 3.6"

http://www.vortechsuperchargers.com/...on.php?pvk=286

5,000 * 7.2/3.6*3.45 = 34,500 rpm. This might net around 5 psi with an S-trim.
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Old Mar 20, 2011 | 11:17 AM
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Other options to limit the boost wouild include: limiting the revs, limiting the throttle opening at WOT, adding a boost limiting valve, or resticting the airflow to the blower.

Of these options, restricting the airflow into the blower with a passive flow restrictor is the most practical. You just need to figure out the right orifice diameter, and find a way to install between the blower and air cleaner. Something on the order of 2.25"-2.5" diameter would work.
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Old Mar 20, 2011 | 07:37 PM
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Found the plumbing pieces . I had them in a box on a shelf.
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Old May 12, 2011 | 01:15 AM
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Originally Posted by Bjh
I currently have a 3.25 diameter pulley on my blower. The small pulley is pushing way to much psi for my stock motor, what size pulley is about 4-5 psi?
Thanks,Brandon
You can download the spreadsheet at the link below and use it to determine the correct size pulley for the amount of boost you want to run.

http://www.superchargerhelp.com/showthread.php?t=4907
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Old May 15, 2011 | 12:07 AM
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I'd go with the 3.60. Other than that, you'll have to go custom.
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