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  1. #1
    skigolfnut's Avatar
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    100* temps-- will bigger nozzle ring help bring speed up?

    It was 100*f here in Texas yesterday and had a nozzle ring question,
    With the water being so warm I noticed my rpms are now at 8300-8400 with a 83mm nozzle ring,

    if I put in the 85mm nozzle ring it should bring up my rpms correct?

    but will it give me more top speed?


  2. #2
    Boost-A-Holic's Avatar
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    From what I understand the larger the nozzle the more thrust/revs and the smaller the more top end and less RPMs. You might loose some speed but should have more thrust and revs.

    I'm having the exact same problem as you. It's been like 106 degrees te last few times I rode. I've been taking pitch to get my revs up as well as swap from an 82mm to 83....but am at 8250-8300 with a 15/18.5 on a 83mm nozzle. I ordered an 85mm ring a few days ago so I'm waiting to find out myself.

  3. #3
    Bob 1tommygunner1927's Avatar
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    Quote Originally Posted by skigolfnut View Post
    It was 100*f here in Texas yesterday and had a nozzle ring question,
    With the water being so warm I noticed my rpms are now at 8300-8400 with a 83mm nozzle ring,

    if I put in the 85mm nozzle ring it should bring up my rpms correct?

    but will it give me more top speed?
    The larger ring size will increase rpm BUT, less thrust and speed. Whats the pitch on the impeller?

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  5. #4
    Bob 1tommygunner1927's Avatar
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    Quote Originally Posted by Boost-A-Holic View Post
    From what I understand the larger the nozzle the more thrust/revs and the smaller the more top end and less RPMs. You might loose some speed but should have more thrust and revs.

    I'm having the exact same problem as you. It's been like 106 degrees te last few times I rode. I've been taking pitch to get my revs up as well as swap from an 82mm to 83....but am at 8250-8300 with a 15/18.5 on a 83mm nozzle. I ordered an 85mm ring a few days ago so I'm waiting to find out myself.
    Repitch the leading edge to 13......

  6. #5
    skigolfnut's Avatar
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    right now I have a 15-20 pitch impeller,
    I have a race coming up next weekend, and don't want to loose to much top end for the back stretch,

  7. #6
    h2jim's Avatar
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    It's so hard chasing speed in the heat.

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  9. #7
    Boost-A-Holic's Avatar
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    Quote Originally Posted by h2jim View Post
    It's so hard chasing speed in the heat.
    i couldn't agree more.

    and tommygunner im def gonna try that out. My buddy just did it to his prop and the acceleration difference is quite noticeable. thanks for the tip.

  10. #8
    Q in Arizona's Avatar
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    Quote Originally Posted by h2jim View Post
    It's so hard chasing speed in the heat.
    You aint kidding. They even grounded flights yesterday out of Phoenix International due to extreme heat. The jet engines are only rated up to 117 degrees for takeoff...needless to say it was hotter than that here yesterday.

    http://www.newser.com/story/170284/w...-grounded.html

  11. #9
    TexasZ's Avatar
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    114 in the shade here in south Texas. A little shower came through today, now it's a freaking sauna.

    Very interesting about pitching the leading edge down for running in the heat...the genius of experience.

  12. #10
    txgp1300r's Avatar
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    In Texas ,we just put away the GPS in the summer and ride.....my FZR is only turning 8300 (14/23) in the heat.

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