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  1. #1
    Flat water sucks! yz426er's Avatar
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    RXT-X Rude RRFPR questions...

    I want to install the Riva X Pro charger upgrade and want to stay with the #42 injectors. Do not want the #50 injectors, and from what I understand the Rude RRFPR will provide the correct amount of fuel at idle and at full boost. Is it necessary to install a AFM to set up the Rude for proper fuel pressures? Or can I set the RRFPR for correct pressure at idle and it will adjust the fuel pressure as needed?


  2. #2
    Flat water sucks! yz426er's Avatar
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    no one knows or has an opinion?

  3. #3
    R88ory RXP's Avatar
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    In theory you are right, It would work. I have not read of any1 using this setup and yes I would highly recomend that you monitor AF to get the RRFPR set correctly. Why do you not want the 50s?? Its proven from Riva to work. R88

  4. #4
    Flat water sucks! yz426er's Avatar
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    The #50 injectors would seem to run rich at all levels of throttle opening other than wide open. If I am wrong on this I'll run the #50's. Maybe the stock ECU will compensate for the differences in fuel requirements.

  5. #5

    sc x charger

    what is a RRFPR mean in seadoo . what kind of parts a those for upgrades

  6. #6
    Flat water sucks! yz426er's Avatar
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    RRFPR= rising rate fuel pressure regulator. I understand it regulates fuel pressure as a function of boost. I may be simplifying it a bit.

  7. #7
    Been there and back! BDNJ's Avatar
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    I run the 50's on my p-x with an ET140 charger. The stock ecu cuts the gas perfectly at idle! Much cheaper route than the rrfpr, unless you plan on going to an aftermkt ecu and rev it way up.

    Brendan

  8. #8
    Been there and back! BDNJ's Avatar
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    I have also run the stock 42's with ET137 charger (similar to x drop in) on my T-x. No issues there either down to 58 degrees F. Again - only with stock ecu.

  9. #9
    Doel Tiburon1264's Avatar
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    42's vs 50's

    I was running yesterday in my 2006 RXT a set of 42's and the RRFPR setup at 58psi. I'm running the x upgrade sc,4" air intake,riva gen II IC, 15/20 prop. stock ECU, 82mm ring and the rest of the mod. I install a Boost gauge and was seeing 12.5psi all day. I had a small problem with those Denso Spark Plugs(corrected on Finding went back to originals). I was running 7960 intil we rase the RRFPR to 60psi and saw 8020rpm. I didn't see 8100 all day. I think! If im not wrong with the 42's you be running to lean. I just purchase a set of 50's and would do some testing today. I would let you know the results.

  10. #10
    Gus13letter's Avatar
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    Do a search and you will find more than enough info. I thought I had all the links I sent to someone recently but dont. Some are good with 42's and RRFPR set to 55, and some are good with 42's set at 65. All depends on the ski and your conditions. Once you go past the stage 3 charger you should check your a/f.

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