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Thread: 10% pulley

  1. #1
    Join Date
    Aug 2002
    Location
    Tyler, Texas
    Posts
    77

    10% pulley

    I hate to sound like a newbie, but how much boost will the 10% pulley allow the SC to put out?

    Rob

  2. #2
    Join Date
    Jul 2002
    Location
    Austin, Texas
    Posts
    816

    answer

    I believe the 10% pulley will put about 3 more PSI. I dare not use one of those though, Im too paranoid that i will blow a headgasket even though my engine only had 10K on it. Our superchargers, although very durable, spin at about 14,500 RPMs and adding a 5 or 10 percent pulley makes it spin much faster. They say that engines with high miles should not use on of these but do what you please haha, good luck--
    Damon
    95SC www.cardomain.com/id/frozenrope

  3. #3
    Join Date
    Aug 2002
    Location
    Reisterstown, Maryland
    Posts
    936
    Any idea what the equates to in horsepower? And for that matter, on a late model, any idea what the boost increase and approximate hp increase are for the following:

    going with early model sc pulley
    going with 5%
    going with 10%

  4. #4
    Join Date
    Aug 2002
    Location
    MS
    Posts
    1,554
    Here you go:

    http://www.sccoa.com/faq/faq.pdf


    Short version:
    Says that the 5% pulley is good for 2 psi 10 hp and the 10% for 3 psi and 15-20 hp.

    Seems to me the 5% offers enough without the risk associated with the 10%, but I haven't done any mod's to mine since I just got it. Exhaust first, regardless though. Might find someone going from 5% to 10% willing to sell one?

    I'm wondering how this affects torque too?

  5. #5
    Join Date
    Apr 2002
    Location
    San Antonio, TX
    Posts
    238
    im not exactly sure but i think that if you have a '94 or a '95 SC and you put an older model pulley on, then you are using a 5% pulley. then would that make the 5% pulley on the older models a 10% on late models? then a 10% on the old models is a 15% on the late models? or am i just making things up now?

  6. #6
    Join Date
    Apr 2002
    Location
    Toronto, Canada
    Posts
    3,809
    Each car will react differently to a bigger blower overdrive. I have run a 10% pulley with both stock, and modified exhaust. It will create more boost, make more power, but also create more heat and can cause the motor to lean out. Be aware that a 10% pulley will increase the likeliness of you blowing your head gaskets.

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