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  1. #1

    Join Date
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    New record for the "Budget Bomber" of 81.8, then disaster!

    Just a quick run-down for those of you who haven't been following my build:

    2004 RXP
    T3 60 trim turbo, robbed from an '84 Mustang SVO
    Home-built jacketed stainless piping
    AEM F/IC piggyback fuel controller
    62 lb injectors
    Riva Grate
    Stock ECU, no hull mod's, no wedge, no skegs
    81 mm ring

    Total invested in mods is about $1800.

    Today, I installed a Skat 15.5/22.5 prop. Funny how much taller it is than my 15/20R solas re-pitched up to 15/24. Anyway, at first, I could only pull this prop 7600 rpm at 14 psi boost. I immediately raised to the boost to the highest it would go by shortening the wastegate rod. 16 psi is all it would do without more grinding.

    Conditions were: Etemp: 95 deg, Ltemp: 85 deg, Rider 190 lb, 2 bars fuel.

    I GPS'd 81.8 mph at 7850 rpm, which is a new best for me. Not too bad for the HEAT too!

    After gassing up to go for a ride, I was accelerating when it started making a bad noise. I killed it and towed it back. I found that the prop had broken where the threaded section meets the splined section. This is apparently about the 4th one that we know of that's done this. I'm dissappointed because it did some damage to the pump shoe that may or may not hurt performance. It damaged all of the "shark's teeth" also.

    Mike
    Last edited by engineermike; 08-28-2008 at 03:54 PM.


  2. #2
    Vern's Avatar
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    Mike, as far as the pump shoe, I would scuff it up, clean it with acetone, then use carbon fiber and West Systems epoxy resin to rebuild it. If it is not too bad, just use the epoxy resin ... strong stuff. Just cut out the sharks teeth and grind/smooth that area out ... they are fine either 100% complete or 100% gone, but damaged at all and they cause cavitation.

    Sorry to hear about the prop failure ... Nice speed numbers tho!

  3. #3

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    Jan 2007
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    Lakeland, FL
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    Vern, where do you get the carbon fiber at? I lost a grate that took that front piece of the pump shoe with it. I've tried filling it in with fiberglass waterproof bondo and epoxy, but neither one lasted for more than an hour. I recently put on an R&D X-model grate which actually filled in some of the missing area, but I still think it could be costing me some speed. The epoxy I used was like $5, not the good West Marine stuff though, but if I spend the money on the good stuff and redo it, I want to ensure it will stay.

  4. #4
    Vern's Avatar
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    Scott, there are few good places on the 'net to buy from, I got some supplies from Jamestown Distributors www.jamestowndistributors.com Good guys, but there are many other places that supply carbon fiber too. I used 5/8 oz, 1 running yard, roughly $60 I think. The good epoxy you can get locally at West Marine and other boating stores usually.

  5. #5

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    I almost forgot! I put the wideband on it and the A/F ratio was almost a perfect 11/1 all the way up to 16 psi boost. This was all using my first stab at a tune in the F/IC using a few equations.

  6. #6
    Fast & Loud meeper's Avatar
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    i think the trick the with these high horsepower setups is to have a larger nozzle diam like the x model to relieve some of the stress on the prop blades upon take off. its easier to push water through a larger hole than smaller one

  7. #7

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    Quote Originally Posted by meeper View Post
    i think the trick the with these high horsepower setups is to have a larger nozzle diam like the x model to relieve some of the stress on the prop blades upon take off. its easier to push water through a larger hole than smaller one
    I would agree to an extent, but if you could see this prop, the problem would be obvious. There is litterally a paper-thin strip of metal that holds the threaded boss on.

  8. #8
    Ziggy's Avatar
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    I know everyone asks, but could you post pix? Thanks!

  9. #9
    West Texas RXP skoepp's Avatar
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    Very nice speed
    sorry to hear about the prop.

  10. #10
    rick xp's Avatar
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    Will you be going back to the 15/20?

    So you only picked up 0.8 MPH by changing props?

    What was the acceleration difference between the two?

    Also when you accelerate with the 15/20 are you on the limiter out of the hole?

    All this talk of these so called turbo props snapping are making me a bit worried. I think i will go with the 15/20 and play it safe.

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