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Thread: Rxt-x 74.4 Mph

  1. #1

    Rxt-x 74.4 Mph

    Hit a new record tonight on the Couch! Did 2 back to back runs of 74.4 MPH on Stalker radar. Den Alt tonight is 3100 ASL, Air 67 Wat 68. This boat rips, need more prop still turning 8040-60 with tweeked 15/22 and a 81mm ring. This 3mm Engine Tech supercharger is unbelivable!


  2. #2
    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by motorsport17 View Post
    Hit a new record tonight on the Couch! Did 2 back to back runs of 74.4 MPH on Stalker radar. Den Alt tonight is 3100 ASL, Air 67 Wat 68. This boat rips, need more prop still turning 8040-60 with tweeked 15/22 and a 81mm ring. This 3mm Engine Tech supercharger is unbelivable!
    Nice speed. What are your mods if you dont mind. So you see a good gain from stock sc to this 3mm.

  3. #3
    Live to RIDE. brendus's Avatar
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    which injectors were u using and any fuel pressure reg??

    awesome numbers. congrates. imagine if you put a ecu on that beast.

  4. #4
    This boat is a basically a Stg 1 Riva with the prop tweeked +1, plus the Engine Tech 3mm wheel. I am running 55# injectors with a fuel controller and a clamp on the MAP sensor.
    Even with the 81mm nozzle you have to lean over the bars or it will leap out of the water. I know you understand den alt so just think what this will do at sea level with good air. I need to tweek the prop another mm.

  5. #5
    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by motorsport17 View Post
    This boat is a basically a Stg 1 Riva with the prop tweeked +1, plus the Engine Tech 3mm wheel. I am running 55# injectors with a fuel controller and a clamp on the MAP sensor.
    Even with the 81mm nozzle you have to lean over the bars or it will leap out of the water. I know you understand den alt so just think what this will do at sea level with good air. I need to tweek the prop another mm.
    so your running 55 injectors with which fuel controler?
    Did you ever try the 3 mm wheel with stock fuel setup?
    And yes those are very impressive numbers with your RAD.

  6. #6
    I have 2 RXT-x's the other is a stocker with the 3mm ET wheel and a Jaws prop no fuel mods, but the stock grate has the wings cut. It runs 70.6 but the snap is not there so I'm sure more fuel and a better intake would be the answer. I need more fuel and will try some 45# injectors. I wish there was a simple fuel solution but I have not found it yet!

  7. #7

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    Are you saying with the the 3mm setup the snap is gone?
    as in worse than factory?

  8. #8
    monaroman76's Avatar
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    Isn't an RRFPR an easy fuel solution ?

    Quote Originally Posted by motorsport17 View Post
    I have 2 RXT-x's the other is a stocker with the 3mm ET wheel and a Jaws prop no fuel mods, but the stock grate has the wings cut. It runs 70.6 but the snap is not there so I'm sure more fuel and a better intake would be the answer. I need more fuel and will try some 45# injectors. I wish there was a simple fuel solution but I have not found it yet!

  9. #9
    YoYamma's Avatar
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    Quote Originally Posted by motorsport17 View Post
    Even with the 81mm nozzle you have to lean over the bars or it will leap out of the water...

  10. #10
    Powertek powertek's Avatar
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    Great numbers....i find I get the best speed numbers with the 82 ring with my 137mm etec wheel. I got over 81 with this wheel.

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