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  1. #1
    MPower's Avatar
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    What fuel requirements for X-charger with XS intercooler?

    Guys, buddy of mine is putting an X charger, XS intercooler, and air intake on his Speedster 150 jetboat (basic 215 sc/intercooled motor).

    My question is, what size injectors will he need for this setup? I think I read Jerry thinks 42s may not be enough. Should he go with 50's?

    Thanks


  2. #2
    Whats that whistling noise? jtskier11's Avatar
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    Quote Originally Posted by MPower View Post
    Guys, buddy of mine is putting an X charger, XS intercooler, and air intake on his Speedster 150 jetboat (basic 215 sc/intercooled motor).

    My question is, what size injectors will he need for this setup? I think I read Jerry thinks 42s may not be enough. Should he go with 50's?

    Thanks
    RRFPR and new prop.

  3. #3
    MPower's Avatar
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    Quote Originally Posted by jtskier11 View Post
    RRFPR and new prop.
    Is the RRFPR the only option?

  4. #4
    Vern's Avatar
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    That or another ECU ... the stock ECU is calibrated for 38s, it will run fine with 42s, but not with 50s ... way too rich. If he wants to keep the stock ECU, then the RRFPR is really the only workable option.

    Truth is we know that a Green Wheel or a Riva S3 wheel and 42s works fine ... but we don't really have much data on the AFR with an IC, 42s, and the X charger. So if he wants to use the X charger he is in somewhat uncharted water and the RRFPR is the safest option.
    Last edited by Vern; 04-07-2008 at 04:51 PM. Reason: added

  5. #5
    Whats that whistling noise? jtskier11's Avatar
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    Quote Originally Posted by Vern View Post
    That or another ECU ... the stock ECU is calibrated for 38s, it will run fine with 42s, but not with 50s ... way too rich. If he wants to keep the stock ECU, then the RRFPR is really the only workable option.

    Truth is we know that a Green Wheel or a Riva S3 wheel and 42s works fine ... but we don't really have much data on the AFR with an IC, 42s, and the X charger. So if he wants to use the X charger he is in somewhat uncharted water and the RRFPR is the safest option.
    What he said.

  6. #6
    MPower's Avatar
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    So he can keep the stock 38's and get a RRFPR?

  7. #7
    Whats that whistling noise? jtskier11's Avatar
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    Quote Originally Posted by MPower View Post
    So he can keep the stock 38's and get a RRFPR?
    Yessir.

  8. #8

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    Or an AEM F/IC and whatever injectors you wanna run (up to 79#ers). . .

  9. #9
    Quote Originally Posted by MPower View Post
    Guys, buddy of mine is putting an X charger, XS intercooler, and air intake on his Speedster 150 jetboat (basic 215 sc/intercooled motor).

    My question is, what size injectors will he need for this setup? I think I read Jerry thinks 42s may not be enough. Should he go with 50's?

    Thanks
    the x model comes stock with 42's. they should be plenty with your combination unless you change the ecu

  10. #10
    AKA: Larry lafjax's Avatar
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    Quote Originally Posted by rotax racing View Post
    the x model comes stock with 42's. they should be plenty with your combination unless you change the ecu
    +1
    The RRFPR with 38's is a good way to go but 42's should work just fine if you keep off the limiter.

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