Thread: Pulley size vs. SC vs. boost

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  1. #1 Pulley size vs. SC vs. boost 
    SE Level Member porshuh's Avatar
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    Do different superchargers (M90, GenV, etc.) make different amounts of boost at the same pulley size? Here is the reason I ask:

    I am unsure of my pulley size - I measured 9.75" on the bottom of the grooves and 10.125" on the top of the grooves. I'm not sure which you're supposed to measure, but it gives me a pulley size of either 3.1" or 3.2". At WOT, I see about 8-9 lbs of boost. I would think for this small a pulley, it should be higher? I am running a GenV SC, and the previous owner seems to have done lots of upgrades (headers + full exhaust, tune, intake, etc.).

    Is there some chart for determining proper boost levels for a given SC and pulley size?


    Question 2:
    Can someone explain how the "clutch" or "activation" system works for the SC? You can gently drive up the rev's to redline without seeing any boost at all (though the SC pulley is spinning every bit as fast, obvoiusly), so I know there is some sort of clutch of feathering system to control the actual supercharger independently of the pulley. If someone can explain how this system works, I'd really appreciate it.

    edit: Here are some pics in case it helps

    Oh yeah - does this look like a quick swap modular system like this one? - http://www.3800performance.com/Merch...roduct_Count=0







    And here's a picture of my dog, in case that helps lol he gets bored when I tinker with my car for too long

    Last edited by porshuh; 07-29-2009 at 02:15 PM.
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