HP loss at altitude - Page 3
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  1. #21
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: HP loss at altitude

    $!#

    +-----------+-------------------+-------------------------------+-------------------------+----------------------------+
    | Altitude | Remaining % of HP | Jetting Changes | Pump Modifications | Comments |
    +-----------+-------------------+-------------------------------+-------------------------+----------------------------+
    | Sea Level | 100% | Modified 44, 46, 48, and 50mm | Test and record peak | Use 50 to 100yrd sprint |
    | | | carbs are more sensitive to | rpm | Not 1/4 mile WOT or |
    | | | density altitude changes. | | power-tune on trailer rpm. |
    +-----------+-------------------+-------------------------------+-------------------------+----------------------------+
    | 1000 ft | 97% | | | |
    +-----------+-------------------+-------------------------------+-------------------------+----------------------------+
    | 2000 ft | 94% | | | |
    +-----------+-------------------+-------------------------------+-------------------------+----------------------------+
    | 3000 ft | 91% | | | |
    +-----------+-------------------+-------------------------------+-------------------------+----------------------------+
    | 3500 ft | 89.5% | -1 main jet or 1/4 | Test peak rpm | Cool World Finals |
    | | | turn in HS screw. | | |
    | | | Adjust low speed circuit. | | |
    +-----------+-------------------+-------------------------------+-------------------------+----------------------------+
    | 4000 ft | 88% | | 1) Test peak rpm | Common World Finals |
    | | | | 2) possible exit nozzle | |
    +-----------+-------------------+-------------------------------+-------------------------+----------------------------+
    | 4500 ft | 86.5% | | 1) Test peak rpm | Hot World Finals |
    | | | | 2) poss reduced pitch | |
    | | | | impeller | |
    +-----------+-------------------+-------------------------------+-------------------------+----------------------------+
    | 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% | -2 main jets or 1/2 | 1) Test Peak rpm | |
    | | | turn in HS screw | 2) reduce impeller size | |
    | | | Adjust low speed circuit. | 3) Possible nozzle size | |
    +-----------+-------------------+-------------------------------+-------------------------+----------------------------+
    | 7500 ft | 77.5% | | +115' day @ lake Havasu | |
    +-----------+-------------------+-------------------------------+-------------------------+----------------------------+
    | 8000 ft | 76% | | | |
    +-----------+-------------------+-------------------------------+-------------------------+----------------------------+
    Last edited by wmazz; 11-07-2018 at 05:06 PM.
    Horsepower == Speed, RPM != Speed



  2. #22
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: HP loss at altitude