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  1. #1

    pulley ratio supercharger 1.1 to 1 vs 1 to 1 kawasaki ultra 250x

    Hello,

    First I will introduce myself, because i am new on this forum.
    My name is Merijn, and I own a Kawasaki ultra 250x. At the moment I am looking for tuning parts.
    Specific i am looking at the supercharger pulley.
    The only question I have. What is best? 1.1 to 1 or 1 to 1. The websites who sell the pulleys don't tell what is best.
    Which deliver's the most horsepower? Is there maybe a difference in engine response?

    Thank's for helping me.


  2. #2
    Take the time to smile sirbreaksalot's Avatar
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    Stock is best for longevity on the super charger

    But the 1-1 is as far as you want to go !!!!!!!!!!!!

    1-1 and good fuel and some timing is safe and best bang for buck

    1.1;1 is best way to guy new supercharger often

    Waz

  3. #3

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    Is it not neccessary to replace other parts also like fuel injectors and ecu?
    Only by changing the pulley could also result in lean mixture and misfire !

  4. #4
    Take the time to smile sirbreaksalot's Avatar
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    Injectors and ecu are waste of time without internal mods , pulley is safe on 07 because very richfrom factory

  5. #5
    bk250x's Avatar
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    Quote Originally Posted by sirbreaksalot View Post
    Injectors and ecu are waste of time without internal mods , pulley is safe on 07 because very richfrom factory
    Old thread but do you know if just getting the pulley for an 08 would be good without the injectors and ecu?

  6. #6
    Take the time to smile sirbreaksalot's Avatar
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    With 43 psi fuel pressure and intercooler water mod and premium it will be ok for grudge racing etc
    And u will more than likely need intercooler temperature interface too

  7. #7
    bk250x's Avatar
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    Thanks for the response

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