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  1. #1

    Rpm/speed advice

    Upgraded 215 challenger 180 with xcharger, external ic, 42 injectors, cone air filter, running 15/22r impeller(I got this from previous post I found).

    My speed is 48 miles now at 7700 rpm. If I punch the gas it hits the Rev limiter.


  2. #2
    no one?

  3. #3
    boost junkie skidoochris's Avatar
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    you must have pump problems
    like junk in the pump
    or worn wear ring
    worn/dammaged prop
    take it apart and inspect for problems

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  5. #4
    RiverRat71's Avatar
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    What skidoo said plus check drive line seal (carbon ring, boot etc..).

  6. #5
    Quote Originally Posted by skidoochris View Post
    you must have pump problems
    like junk in the pump
    or worn wear ring
    worn/dammaged prop
    take it apart and inspect for problems
    Wear ring is really decent. New prop. I took pump apart all clean.

  7. #6
    boost junkie skidoochris's Avatar
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    was the prop seal/cone loose
    what was the gap on the ring
    15/22 is too much prop for a X SC
    especially in a boat ( twice the weight of a rxt)

  8. #7
    Quote Originally Posted by skidoochris View Post
    was the prop seal/cone loose
    what was the gap on the ring
    15/22 is too much prop for a X SC
    especially in a boat ( twice the weight of a rxt)
    It looked good. 14/19 is not enough from reading this forum.

  9. #8
    RiverRat71's Avatar
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    Does it cavitate when you give it full throttle? If max rpm is 7700 then you are not at the rev limiter.

  10. #9
    Quote Originally Posted by RiverRat71 View Post
    Does it cavitate when you give it full throttle? If max rpm is 7700 then you are not at the rev limiter.
    yep.. as it cavitates its banging on the rev limiter

  11. #10
    Mothman's Avatar
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    Did those boats run the normal 159mm impellers or a 160?
    Might try a 15/20 to gain rpm.

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