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  1. #1
    Bob 1tommygunner1927's Avatar
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    "Tested New Mods with Results, part II".

    I thought I would pick up where Steve, aka, Skoepp, left off with the 2008 RXT-X255.

    In review, Steve's last post listed the following:

    1. RXT-X
    Conditions were as stated
    above but 41 degree air and 49 water. (5 wind)
    My air was so good that my RAD was 950 ft and I was riding at 2,200 ft. elevation. So good I loss 1,200 ft from actual.

    Ski had about 1.5 gallons and i added 4 gallons. I rode ski for 25 minutes and buzzer never went off still showing 3 bars.
    I did not want to run the ski any more then that just in case she was getting lean from such good air.

    Ski would pull 8,040 to 8,060 with 83 ring and 15/23.5
    Boost was 10.8 psi, and my best to date was 10.3 and usually ran 10.1 psi.
    I reset GPS 3 different times and clicked off a best of 75.8 mph.
    What was amazing is i still had either a bit of pitch to add or nozzle ring change to get to 8,000 rpm and might could have picked some tenths.

    Conclusion
    ON RXT-X with stock power (stock ecu, stock SC, and no ride plate)
    and any other mod can be used.
    summer heat - top 72 - 74 mph max
    cool good conditions top 74 to 76 mph
    That is what i see possible with stock power and no ride plate.


    Heres Skoepp's setup so you dont have to go look for it.

    RXT-X
    4 inch front air
    manifold mod
    stock moded grate
    riva reloaction kit (ic)
    stock water box gutted and shortened with riva thru hull to rude tip
    catch can
    RE's
    pro nozzle with 83 ring
    15/22 repitched to 15/23.5




    My mods are as follows:

    Stock ecu
    Stock X charger (Viton seal/McMaster SWs)
    Stock waterbox modified by SF
    Stock ride plate modified by SF
    Stock intake manifold w/FA removed, Ross TB mod, and SF rear air intake tray
    Stock exhaust manifold drilled/tapped for O2 sensor (plugged until I get the LC1)***
    Riva IC relocate kit, Riva thur the hull exhaust, Riva intake grate
    Riva ProNozzle w/82mm ring & SF modded Solas (15/22R) 12.5/22.5 w/setback and SF nose cone
    R&D pump wedge, Steering Nozzle, and Powershot (stock settings.....I haven't messed with it yet)***
    Separate cooling lines: pump to exhaust, venturi/opas to IC.
    RE's
    75 @ 8100.



    To date my data/speed is:

    April 13, 2011

    Lake Somerville (morning)

    Full tank

    Air temp: 70.2

    Water temp: 73

    Humidity: 56%

    Pressure: 30.05

    Speed: 74.3 mph @ 8180-8200 rpm

    Weather conditions were 3-4 inch chop and windy

    First run netted 74.3 @ 8200rpm at 3/4 throttle (full tank of gas). VTS fully up. On holeshots the rpm would go immediately to 8100 then settle down to the high 6K range then up again to 8180-8200. Then the bottom outlet hose on the exhaust manifold blew off! I fixed it on the ramp.......I rode around for while until I had about 3 bars of fuel left, then put the ski back on the trailer.

    * Removed the 84mm ring, replacing it with the 82mm ring. VTS 1 above middle, then switching to middle. My new & best top speed is 75mph @ 8100!!! Did I say I happy? Oh yeah! Holeshot rpm went to about 7100+, dropped slightly to about 6800 to 6900, then to 8100rpm.

    Afternoon:

    3 bars fuel remaining

    Air temp: 76

    Water temp: 75

    Humidity: 52%

    Pressure: 29.92

    Speed: 75 mph @ 8100 rpm (with flash to 8120) *

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    Last edited by 1tommygunner1927; 11-19-2011 at 08:27 PM.


  2. #2
    Bob 1tommygunner1927's Avatar
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    A few weeks ago I downloaded "LOG WORKS" (from the Innovate Racing site), to my Iphone via ITunes. Its free.......

    I recorded the following graphs on 5/13/2011, however, I don't know how accurate the findings are. My best run stated 75 mph but my gps stated 74.7 mph.

    Also note I replaced the Solas 12.5/22.5 with an OEM impeller, pitched by Duke to 15/20 w/82mm ring. High RPM was 8160-8180. This impeller needs a little more pitch on the trailing edge.

    The first graph shows the holeshot, but because I had the VTS fully up the ski unhooked big time......the other graphs depict momentary unhooking as the lake was slightly choppy.
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  3. #3
    mrbtd's Avatar
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    I would bet the [email protected] grate is better for your set up. The Riva grate was horrible on my t-x.

  4. #4
    Bob 1tommygunner1927's Avatar
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    I agree......but I just bought and installed a WORX grate.....b/c the RIVA grate unhooks way too easily. More testing to follow. But first I'm going on a road trip to NY to visit my daughters.

  5. #5
    Bob 1tommygunner1927's Avatar
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    Tested the WORX intake grate today.......although my ski could only manage 72.2 mph (actually, thats as fast as I was willing to go), the lake was very choppy from 15-20+ mph winds. There is no way the RIVA grate could have kept up in those conditions.

  6. #6
    West Texas RXP skoepp's Avatar
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    I really liked the worx on the T-X.
    Great holeshot, hookup, and control.
    I don't expect the worx any slower or faster then the riva on glass, but anything else the riva looses.
    The worx, works good on that pump/hull setup just to dangerous to run on a P-X.
    Don't have worry about that Buck on the couch.

    Did You ever try a moded X grate?
    Its fast on that ski but does not hook ad good as the worx.

  7. #7
    krouchchocolate's Avatar
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    Hey Skoepp,

    Have you tried the worx grate on the regular RXT?

  8. #8
    West Texas RXP skoepp's Avatar
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    No but I would like too.
    Running a riva right now.

  9. #9
    Bob 1tommygunner1927's Avatar
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    Quote Originally Posted by skoepp View Post
    I really liked the worx on the T-X.
    Great holeshot, hookup, and control.
    I don't expect the worx any slower or faster then the riva on glass, but anything else the riva looses.
    The worx, works good on that pump/hull setup just to dangerous to run on a P-X.
    Don't have worry about that Buck on the couch.

    Did You ever try a moded X grate?
    Its fast on that ski but does not hook ad good as the worx.

    I only spent about an hour on the lake yesterday due to time constaints, but I'm really liking the Worx grate percisely for the reasons you stated. The key word is CONTROL.

    I haven't cut my stock X intake grate yet, but will do so on Monday. Thanks for the reminder!

    I forgot to mention I had removed the Solas impeller for JPT7779 to test on his ski. I installed the original OEM impeller, repitched by SF, and changed out the 82mm ring for an 83mm ring.
    Last edited by 1tommygunner1927; 06-05-2011 at 08:20 PM.

  10. #10
    Gomer Pyle starter99's Avatar
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    i run good all day to 8200 rpms 76mph then a storm come in and the air got cold then i got to 78 mph

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