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Thread: underdrive pulleys...

  1. #1
    Join Date
    Dec 2006
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    New Jersey
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    underdrive pulleys...

    are they worth the extra 5 hp for 300 dollars in the long run or is a new belt with a new tensioner just fine?

  2. #2
    Join Date
    Apr 2004
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    sumter, south carolina
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    well they're not 300 for the steel ones. more like 200-ish. i actually just bought a nice used set for $80.

    and i've read and heard that they're actually a very good mod for the money, worth 10-15hp


    and what's wrong with your tensioner, by the way ?

  3. #3
    Join Date
    Apr 2002
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    St. Charles, MO
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    I think underdrives are one of the first mods every SC should get. You can usually find a used set for about $100 and they are worth an honest 10-15 HP. Can't think of any others mod that will give that much HP for the money, except nitrous.

    David
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat.............10.597 @ 135.78

    My Garage

  4. #4
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    Quote Originally Posted by David Neibert View Post
    I think underdrives are one of the first mods every SC should get. You can usually find a used set for about $100 and they are worth an honest 10-15 HP. Can't think of any others mod that will give that much HP for the money, except nitrous.

    David
    oh and the 5% OD pulley i got. where else can i get 10+hp for $80 ?

  5. #5
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    ah thank you for the quick replies, just another thing to add to the 'to do' list i suppose, thanks
    tensioner: well its going to come with my mp package...so why not replace them when i get all my new pulleys such as the OD pulleys (and now UD pulleys)
    Last edited by johnrada; 07-21-2007 at 03:55 AM. Reason: tensioner

  6. #6
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    Quote Originally Posted by johnrada View Post
    ah thank you for the quick replies, just another thing to add to the 'to do' list i suppose, thanks
    tensioner: well its going to come with my mp package...so why not replace them when i get all my new pulleys such as the OD pulleys (and now UD pulleys)
    If you using the MP overdriven crankshaft pulley...you can't use underdrives. If you overdriving the blower from the jackshaft or the blower snout, you can use underdrives.

    David
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat.............10.597 @ 135.78

    My Garage

  7. #7
    Join Date
    Dec 2006
    Location
    New Jersey
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    which is more effective for creating more power, and is it ok to use the 15% overdrive kit with the underdrives or forget the underdrives and go for 25% overdrive?

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