World Finals Weather - Page 2
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  1. #11
    PWCToday.com Is My Home Away From Home wmazz's Avatar
    Join Date
    Jul 2013
    Location
    Riverside, CA
    Age
    58
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    2,531
    Blog Entries
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    Re: World Finals Weather

    Altitude Remaining % of HP Jetting Changes Pump Modifications Comments
    Sea Level 100% Modified 44, 46, 48, and 50mm
    carbs are more sensitive to
    density altitude changes.
    Test and record peak rpm Use 50 to 100yrd sprint
    Not 1/4 mile WOT or
    power-tune on trailer rpm.
    1000 ft 97%
    2000 ft 94%
    3000 ft 91%
    3500 ft 89.5% Test peak rpm Cool World Finals
    4000 ft 88% 1) Test peak rpm
    2) possible exit nozzle
    Common World Finals
    4500 ft 86.5% 1) Test peak rpm
    2) poss reduced pitch impeller
    Hot World Finals
    5000 ft 85%
    5500 ft 83.5% A hot day +100' in
    CA. and AZ.
    6000 ft 82%
    6500 ft 80.5%
    7000 ft 79% 1) Test Peak rpm
    2) reduce impeller size
    3) Possible nozzle size
    7500 ft 77.5%
    8000 ft 76%
    Last edited by wmazz; 11-08-2018 at 04:00 PM.
    Horsepower == Speed, RPM != Speed



  2. #12
    Frequent Poster mrwhipper's Avatar
    Join Date
    May 2017
    Location
    New Holland
    Posts
    217

    Re: World Finals Weather

    It is very kind of you to share this information!!!

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