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  1. #1

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    04 rxp speed after mods ?

    iv'e done some mods to a 04 rxp, of which my customer bought off jerrys store, the mods were, rude charger, rear air intake, riva gen2 intercooler,thru hull exhaust, 50,s injectors, catchcan, groco, rear flowrights, 15/22 4 blade, i see this craft, after dialing in to do 74 + 75mph, would you agree? regards bill


  2. #2
    I'm betting faster.

  3. #3
    Vern's Avatar
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    Faster, but what ECU? The stock ECU and 50s will not work well ...

  4. #4
    West Texas RXP skoepp's Avatar
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    I agree with others, faster.
    Vern has a good point, I know your pig ritch at lower rpms and i bet you still might be even at WOT, which could be slowing you down some. The quick fix is too put back stock injectors and run the rrfpr imo.
    i think there is more speed to be found.

    IF you are running different ecu then throw out all that i said except for then your really slow, and not being a SA either.

  5. #5

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    Quote Originally Posted by Vern View Post
    Faster, but what ECU? The stock ECU and 50s will not work well ...
    it is a stock ecu, with 50s is that not a good combination?

  6. #6
    Vern's Avatar
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    Bill, the stock ECU is calibrated for 38 lb injectors, so the 50s would not work well, especially down low. With a Rude, I would go with 42s and a RRFPR instead. The stock ECU still does fine with 42s, but I don't think anybody has run injectors larger than 42s with the stock ECU successfully.

  7. #7
    DaveC's Avatar
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    They are correct Bill, you are going to either need some type of electronic controller to run the 50# injectors or try a RRFPR with 42# injectors. The 50# injectors will not work with the stock ECU as it will be very rich and will not reach the upper RPMs.






    Quote Originally Posted by Vern View Post
    Bill, the stock ECU is calibrated for 38 lb injectors, so the 50s would not work well, especially down low. With a Rude, I would go with 42s and a RRFPR instead. The stock ECU still does fine with 42s, but I don't think anybody has run injectors larger than 42s with the stock ECU successfully.

  8. #8

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    Quote Originally Posted by DaveC View Post
    They are correct Bill, you are going to either need some type of electronic controller to run the 50# injectors or try a RRFPR with 42# injectors. The 50# injectors will not work with the stock ECU as it will be very rich and will not reach the upper RPMs.
    well iv'e asked jerry, the injectors may have been wrongly sent, we'll see

  9. #9
    oklagp1200r's Avatar
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    With the stock ECU he should be able to use the stock injectors and a RRFPR thats what Jerry told me!

  10. #10

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    Quote Originally Posted by DaveC View Post
    They are correct Bill, you are going to either need some type of electronic controller to run the 50# injectors or try a RRFPR with 42# injectors. The 50# injectors will not work with the stock ECU as it will be very rich and will not reach the upper RPMs.
    we tested the ski today, and was very supprised how well it ran with the 50s, there was no spluttering at idle it was very sweet at 1750 flash 1800 rpms, i even left it idling for long periods of time, then nailed it, it pulled like a train straight to 8100rpms, i even tried it at all stages of the rpms, it ran great with no signs of overfueling at all, i'll have to put a AF guage on thou just to see were it is, but in all it ran mint, 74.6 gps in slight chop.

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