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  1. #1

    Join Date
    Feb 2013
    Ontario, Canada

    12' rxpx top speed thoughts

    Hey guys looking for some feedback, 12' rxpx (vtech 8375, riva gen3 with hard pipes, 15/20r untouched, riva intake and catch can) was out yesterday in the lake and I was getting a consistent 7920 rpm at 73mph on dash( I know it may not be accurate but it is just a number to go by) what do you guys think I should do to pull my rpms up closer to limiter? should I put the stock prop back in or get this one repitched? Weather conditions were 26 degrees 3 km/h winds, lake flatwas probably high humidity as well.

  2. #2
    ATNryan's Avatar
    Join Date
    Apr 2012
    River Crew CT
    Seems like your RPM's are a little low, but it does depend on your prop. I would tweak the 15/20 you have to give you 200-300 more RPM's. I know RIVA says their "R" props are put in a pitch block before hand, but most people on here have discovered that they are usually off. My 15/20 measured 15/19 on two blades and 15/19.5 on the others. Your's may be pitched higher around 15/20.5-21 and that could be the reason for the lower RPM's too. As usual, check for boost leaks and all your couplers to make sure their are no boost leaks either.

  3. #3
    Mod less, ride more! troyheb's Avatar
    Join Date
    Jul 2007
    Nederland, Texas
    Get the Solas pitched to a 15/19.

  4. #4

  5. #5
    myown1manarmy's Avatar
    Join Date
    May 2012
    Noblesville, Indiana, United States
    I have the 15/20 also and I find it hard to turn it even with the mods I have I still run 8200. unless your in freezing weather like troy said pitch that thing and it will help get your rpms up

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