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  1. #1
    Ndskyz's Avatar
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    2012 rxt x with et 68-140 what size prop

    With the mods in my signature what prop should I be running. I have a 15/19 and a 9000rpm rev limit but I'm all over the limiter I have repitched the prop to a 15/20 should I pitch it some more? How far do you want to stay off the limiter
    Thanks


  2. #2
    Water4fire's Avatar
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    I was all over the limiter with my 15-20 and 12 PX with a 68-140. I would think you would need a little bit more than a 15-20. I havent run the TX with mods yet, but hope this helps.
    I turned a 15-22 8760 with 68-140xle

  3. #3
    boost junkie skidoochris's Avatar
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    I bet a stock 15/22 will only get you to 81-8200 on a t
    also IMO I would stay under 88 on flat water with a 9000 limit
    in the chop the rpms are much higher
    Last edited by skidoochris; 08-01-2013 at 08:25 PM.

  4. #4

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    Quote Originally Posted by Ndskyz View Post
    With the mods in my signature what prop should I be running. I have a 15/19 and a 9000rpm rev limit but I'm all over the limiter I have repitched the prop to a 15/20 should I pitch it some more? How far do you want to stay off the limiter
    Thanks
    I can turn my 68-140 / S3 TX 9k+ with a Solas/SFR 12.5/21 but only in the cold months. 8860 in the summer months...

  5. #5
    AtoMIC_OraNGE greenbullet's Avatar
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    stock 15/22 will run 8100 rpm with that charger.. im running riva ecu at 8600 and a ported head at a 15/24 right now

  6. #6
    JT jpt7779's Avatar
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    Quote Originally Posted by Ndskyz View Post
    With the mods in my signature what prop should I be running. I have a 15/19 and a 9000rpm rev limit but I'm all over the limiter I have repitched the prop to a 15/20 should I pitch it some more? How far do you want to stay off the limiter
    Thanks
    What speeds are you seeing?
    Are you using the stock 83mm nozzle or a 87mm nozzle?
    IMO, 8750-8800 rpm with the S3 RXT-X hull is the sweet spot for overall pump efficiency and is proven safe for stock valves.
    I was seeing 81-82 mph with my ET 137. I now have a ET 68-140 that is just getting broken in. I rode yesterday in 103* heat in 90* water and only saw 8600-8700 rpm. Once it cools down I should be right at 8800 and over 83 mph.
    I use a SFR modified Solas 12.5/19 and is set up for very high heat that we see in Texas. You must have some cooler weather and water temps, so I suggest trying the 15/20 and or play with the leading edge also 13-14.

  7. #7
    pete71's Avatar
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    Mac racing has some props in his ebay store that may suit your requirements at a great price

  8. #8
    Water4fire's Avatar
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    How in the heck did I turn my SRZ 15-22 8740+ in my 12 PX then with my 68-140? I guess I have alot to learn on the T-x.

  9. #9
    Ndskyz's Avatar
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    Thanks for all the input.
    Jt I seen 112km (69.5mph) but did not want to hold it wot as it was bouncing off the limiter. I have the stock nozzle and air temp was 14c (57f) water temp was 11c (51f)

  10. #10
    Ndskyz's Avatar
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    So do I want to stay 200rpm off the limiter or is 100rpm ok

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