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  1. #1
    masta2000's Avatar
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    tuning with 81mm or 83mm?

    which exit diameter is better for top speed. i am about to dial in my rpms and am wondering whether there is a difference between both exit nozzles at the same rpm?


  2. #2
    As far as i know the smaller the nozzle the better top end, bigger nozzle is better holeshot.

  3. #3
    jdbretz's Avatar
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    The smaller nozzle (anything smaller than 83mm for an RXP) will lower your RPM's and give you a higher top speed. Once you have your prop tuned to the normal conditions you ride, as the weather changes you can just change rings instead of tuning your prop. The larger size ring will give you a better holeshot.

  4. #4
    GOT BOOST? Dockside's Avatar
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    ill be doing this aswell, so 81mm would be best then even if i have to take a couple mm out of the prop Im thinking with 83mm in the summer ill be bang on with my rpms with an un touched 15/20r...

  5. #5
    iron head's Avatar
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    82 mm is the best that where I get my best speed

  6. #6
    Big K's son KeithKman's Avatar
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    If you have: 81, 82, 83 rings tune with the 82. If it's hot out put in the 83 ring. If it's cold put the 81 in.

  7. #7
    GOT BOOST? Dockside's Avatar
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    Quote Originally Posted by KeithKman View Post
    If you have: 81, 82, 83 rings tune with the 82. If it's hot out put in the 83 ring. If it's cold put the 81 in.
    that a good idea... I bought a set off Austin and they should be here any day now.

    I'm going toget my stock nozzel machined, How tight should the ring fit in the nozzel

    right now air temps 80 water 70 and im at 8100-8120 but also have 18hrs on the charger since i upgraded to a new wheel and riva washer so i need to check the slip.

  8. #8
    Quote Originally Posted by KeithKman View Post
    If you have: 81, 82, 83 rings tune with the 82. If it's hot out put in the 83 ring. If it's cold put the 81 in.

    That's just toooo logical.

  9. #9
    Big K's son KeithKman's Avatar
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    Quote Originally Posted by Dockside View Post
    that a good idea... I bought a set off Austin and they should be here any day now.

    I'm going toget my stock nozzel machined, How tight should the ring fit in the nozzel

    right now air temps 80 water 70 and im at 8100-8120 but also have 18hrs on the charger since i upgraded to a new wheel and riva washer so i need to check the slip.
    I have the Riva nozzle. If the set screws are removed and you put the rings in, they would easily fall out if the set screws aren't screwed into the rings. I hope that makes sense. Just make sure you have it machined so you can remove them but they are snug without the set screws in place.

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