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  1. #1
    race24x's Avatar
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    2012 RXT IS Lacking speed after upgrades

    2012 RXT IS 260
    Riva Air kit (for the suspension hull)
    Vtech 8375 Tune
    Solas 15/20 impeller (Its the old style but had the setback done)
    R&D Intake Grate

    I think I need to send my impeller out to be repitched, because I am only turning 7800 at 70 Mph. I have the additional spark arrestor kit to put in as well, but I didnt think the impeller would keep the RPMs down that low right out of the box. What else should I look at? I didnt want to do to many upgrades to this ski just a few to get it to 75MPH my buddy can run 75 76 all day with the AS model with the same upgrades.


  2. #2
    See my sig.

    I'm running pretty much identical but on an aS.

    My prop is 15/21.

    Flame Arrestor delete kit should help too.

    Two things I'd look at before re-pitch, check SC slip to make sure you're producing good boost (irrespective of hours since build) also fuel pressure. The stock fuel pressure regulator is known to be junk from new. The v-tech tune expects stock pressure of 58psi, some guys on here saw their stock pressure at 51psi. Get a RIVA RRFPR and set it firm 58psi and forget about it.

    You really should be monitoring your AFR's soon, all that extra air flow could send you lean if you're not careful. Check out CMD autotune.

    My speed and rpms are with 8350 tune, NO rrfpr or CMD. Just fitting these now, so hoping for a solid 75mph. Later a Gen3 or Fizzle should give me another 200rpm I hope.

  3. #3
    Full Throttle or Broke!!! UNSANE's Avatar
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    My prop is set to 12/18 on an 83mm nozzle and I've hit 74.6 at 8400rpm in perfect conditions. I'm running a constant 70+ in the heat with heavy fuel loads (72ish). Be careful about setting an SRX prop too far back. I learned the hard way as it will spin a driveshaft. I'm using the SRZ right now without issue and I left the stock rubber nosecone on it. It can be a pain to put an AFR gauge on these because of the deck, but my fuel pressure regulator is set to 58psi. I'm on a Vtech tune now with an 8600rpm rev limit due to the retainers I've added.

  4. #4
    Quote Originally Posted by UNSANE View Post
    It can be a pain to put an AFR gauge on these because of the deck
    Do you mean because you have to remove the deck to get to the manifold or that the space is too tight to get a sensor in there?

  5. #5
    JT jpt7779's Avatar
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    Race, IMO you need to look elsewhere for your rpm loss. The 15/20 is just about perfect for your ski. I'd be looking for boost leaks, SC to IC, IC to TB hose clamps loose. I would also pull the IC to TB hose off and run the ski on the water hose and make sure there is ZERO water coming out of the IC to the TB, if any at all that is your problem.

  6. #6
    NateRXP's Avatar
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    Tune didn't download correctly?

  7. #7
    Mod less, ride more! troyheb's Avatar
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    Put a better IC in the ski.

  8. #8
    Full Throttle or Broke!!! UNSANE's Avatar
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    Quote Originally Posted by tornado34 View Post
    Quote Originally Posted by UNSANE View Post
    It can be a pain to put an AFR gauge on these because of the deck
    Do you mean because you have to remove the deck to get to the manifold or that the space is too tight to get a sensor in there?
    You can get a sensor in there, but it's running the wire to a gauge that's attached to a moving deck.

  9. #9
    Full Throttle or Broke!!! UNSANE's Avatar
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    I had the same sipped loss when I started using Worx and rd grates. I was running close to 73 on the stock grate with a 15/22 SRX on an 87mm nozzle. The stock grate is the fastest, but also very dangerous. That's what caused my pump to stuff and throw me. Two crushed vertebrae were among my injuries. Switched grates and my rpm went down to 7800 along with the speeds. Had my prop pitched to 12/18 on an 83mm nozzle and I'm safely back up to 72-74. Rpms are around 8300ish in the heat.

  10. #10
    Full Throttle or Broke!!! UNSANE's Avatar
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    And yes...IC's can be a problem on these skis. Mine was replaced under warranty recently.

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