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Thread: R&D 1:1 pulley

  1. #1

    R&D 1:1 pulley

    Took a look at R&D's site, says the 1:1 pulley makes an additional 30 hp,,, is this just because it's made of aluminum and is lighter than the stock steel one allowing the charger to make up to an additional 3lbs of boost ?? Also, wouldn't you need to block off ot have an adjustable blow-off valve to handle the extra boost ??

    Also, is this just a simple bolt on 93 octane mod, or do you need fuel system mods ??
    Last edited by Chris288; 10-04-2007 at 01:02 PM.

  2. #2
    R rated's Avatar
    Join Date
    Nov 2006
    Bayville NJ
    The pulley is smaller and aluminum ,yes lighter And yes you must block off the bov valve , and add some more fuel
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  3. #3
    Vern's Avatar
    Join Date
    May 2005
    Grand Haven, MI
    Chris its the size that matters ... with the pulley on the SC being smaller, it is spun faster, creating more boost. In theory it would make the same amount of boost if it was heavy iron or aluminum.

  4. #4

    Join Date
    Mar 2010
    miramar FL
    block off 1 of the bov valve or both of them

  5. #5
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
    Join Date
    May 2008
    On the 250 you will want to upgrade the fuel system by removing the factory pressure regulator, installing an adjustable one installing a walbro fuel pump and adjusting the pressure based on the data from a wideband o2 sensor.

    So no its not just a bolt on


  6. #6
    Beagleman62's Avatar
    Join Date
    Mar 2007
    Richmond, Virginia
    Quote Originally Posted by mandyboy305 View Post
    block off 1 of the bov valve or both of them

    Go ahead and block off the relief valve behind the throttle body and see what happens.

  7. #7
    Banned User
    Join Date
    Apr 2011
    Miami, FL
    Quote Originally Posted by Beagleman62 View Post

    Go ahead and block off the relief valve behind the throttle body and see what happens.
    jajaj yea go ahead and do it u will get scared, i did it once and oh my

  8. #8
    Formerly Ultra250 TN Aquaholic6801's Avatar
    Join Date
    Feb 2007
    Old Hickory,Tn
    WTF????This thread is 4 yrs old...............

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