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  1. #1
    Jarrett's Avatar
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    RXP-X - Riva X-Charger Pro-Series Impeller & Housing?

    Who has installed it with the stock ECU? What gains did you see? How many RPMs gained? Any reliability issues? Any other issues like idling, fuel consumption, etc?


  2. #2
    Never say never KirkF350's Avatar
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    Quote Originally Posted by Jarrett View Post
    Who has installed it with the stock ECU? What gains did you see? How many RPMs gained? Any reliability issues? Any other issues like idling, fuel consumption, etc?
    You ask the best questions.

  3. #3
    Jarrett's Avatar
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    Hehe, thanks. I spend too much time thinking about this stuff

    Here are the only answers I've been able to find so far. I was wondering if there were more or updates to these:
    Quote Originally Posted by FallinOffHurts View Post
    Just got the ski on the water with the mods. No rrfpr. I don't have a wideband on the ski, and I'm sure it maybe running a little rich with the 50's but what a DIFFERENCE! This thing went from a ski to an animal. I am extremely happy with the mods. Time will tell if it's a safe, reliable setup. Ski only has 20 hours on it.

    No problems with starting or idling. Also no problems while idling for long periods of time through no wake zones. It "smells" like it's rich at idle. That's about the only difference with it being a rec ski.

    I did notice using considerably more fuel though. I'd say about .5 to 1 extra gallon per 25 miles or so have on and off WOT. I am going to be adding an a.f guage soon so I can check afr's. I will keep you posted!
    Quote Originally Posted by JOEYD0730 View Post
    i installed the riva x-charger upgrade and 50lb injectors in my 08 x, stock ecu, within the first hour i poped the head gasket. i would highlr recommend monitoring your afr..

  4. #4
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    TUNING REQUIREMENTS: Fuel: Installation of this RIVA Performance Product requires the use of RIVA Pro-Series 50lb Fuel Injector Kit (part# RS12050-I-KIT-50). Failure to install this part will result in engine damage. Pump: Impeller & Reduction Nozzle combination must produce 8,000 peak RPM with stock ECU or 8,400 peak RPM with RIVA Pro-Series ECU.

  5. #5
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    from my findings u are ok with 48's over the 50's with the stock ECU.

  6. #6
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    Quote Originally Posted by JonnyRXT View Post
    from my findings u are ok with 48's over the 50's with the stock ECU.
    I thought 42's with rrfpr would work just fine???
    42's work with the Rude...I don't think this wheel has more boost than the Rude.

  7. #7
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    48's with stock X ecu gives a better AFR then the 50's

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    Jarrett's Avatar
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    Quote Originally Posted by JonnyRXT View Post
    48's with stock X ecu gives a better AFR then the 50's
    What does this mean? More performance with the 48s?

    Saw this is another thread by the way:
    Quote Originally Posted by JOEYD0730 View Post
    i installed the riva x-charger upgrade and 50lb injectors in my 08 x, stock ecu, within the first hour i poped the head gasket. i would highlr recommend monitoring your afr..
    Quote Originally Posted by Green Hulk View Post
    Joey, isn't this the same ski you had the hoses crossed on the side of the thermostat? I assure you it was an overheat of the engine that caused the popped head gasket, not the supercharger and not from running lean. 50's and the Riva X model upgrade is a proven setup.

  9. #9
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by Jarrett View Post
    What does this mean? More performance with the 48s?
    Leaner is meaner but too lean then BOOM!

    Riva recommends the 50's with their X upgrade. They say nothing about 48's. Riva doesn't just "guess" at injector size. They do lots of dyno and on water testing to come up with their recommendation.

  10. #10
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    well if u do the math on the amount of fuel difference from the 50's and the 48's its not that much, the 48's at wot with the x upgrade gives u about 12.4 afr and the 50s comes out to about 11.8. thats just what i have seen on a X boat up here.

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