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Thread: GPRXP Weight

  1. #1
    cheatin' piston popper addicted's Avatar
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    GPRXP Weight

    I finally had a chance to measure my ski against my friends nearly stock GPR. the results are surprising and should dispell some common notions about the conversion ski's.

    The test involved a 24x24 wood stand that I made, and a set of car scales. The scales were arranged so that each corner of the stand was centered on the scale. A center mark was drawn on the stand. The ski's were lowered onto the scale after they were zeroed out with the stand on them. then they were slid forwards or backwards so that each one read as close to the same as possible. Once this was done, the line from the center of the stand was copied onto the hull representing the balance point. Measurements were then taken from the end of the stock tabs to the mark.

    Both ski's were 100% ready to drop in the water and ride. Both had full tanks of gas, full oil, battery, tow ropes, dry box, fire extinguisher, ect. I feel this is an accurate way of measuring these things, since manufactureres listed dry weight means nothing if you actually plan on riding.

    Both were weighed with my seat. My seat is bone dry, the stock seat cover was removed and a hydroturf cover installed. The foam was not touched. The other ski's seat is original, but had some waterlog. Mine weighed 17 lbs. the other was 22 lbs.

    First up is my buddies 2000 gpr. Mods are as follows:
    -solas prop
    -flame arrestors
    -D plate
    -All else 100% stock as it left the factory

    Total weight 832lbs.
    Balance point 48.875" from the end of the stock trim tab


    My ski has the following stock parts:
    -tabs
    -sponsons
    -waterbox
    -sound suppression
    -gas tank
    -prop
    -midwall
    -Steering

    Conversion specific parts:
    -aluminum motor mounts
    -1200 grate
    -FF plate
    -heat exchanger
    -thermostat and coolant bottle
    -08 mid pipe
    -05 pump with 2" ext
    -My drive shaft
    -Reinforced tunnel
    -front grate support

    Conversion ski weight 849lbs
    Balance point 47.625" from end of stock trim tab


    that means that a gpr, regardless of the motor weighs more than 1000lbs with a rider!!!!!!!!!!!!!!!

    So, 17 lbs heavier for the conversion, but it's balance point is 1.25" further to the rear!
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  2. #2
    Flying Scotsman's Avatar
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    Good data

  3. #3
    Moderator beerdart's Avatar
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    Good stuff Mike.

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    mrbtd's Avatar
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    Thank you Mike !!!!!!!!!!!! We appreciate how much work you have into doing that.

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    Moderator RX951's Avatar
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    Thanks Mike, Looking at the RR weight, is that where the IC, battery or exchanger is at?

    also, would it be safe to say and open loop conversion is closer to a stock GPR in weight?

  6. #6
    cheatin' piston popper addicted's Avatar
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    Quote Originally Posted by RX951 View Post
    Thanks Mike, Looking at the RR weight, is that where the IC, battery or exchanger is at?

    also, would it be safe to say and open loop conversion is closer to a stock GPR in weight?

    no. that's the stock ski. The pic of the display from the conversion was whited out by the flash the stand must have has a little twist in it because 2 opposite corners would always seem to balance out.

    I think an open loop ski like yours is propably within a few pounds of mine. the aluminum mounts save 10lbs, and it all gets put back by the cooling system. yours actually may be slightly heavier because of the heavy jpipe. my entire exhaust is aluminum.

  7. #7
    cheatin' piston popper addicted's Avatar
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    oh, MOD's, i wasn;t sure if this should go in performance or FAQ. . . please move it if i put it in the wrong spot.

  8. #8
    Moderator RX951's Avatar
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    This is good Data

  9. #9
    Duke's Avatar
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    Kinda what I came up with only by feel. The newer Efi hulls are much lighter and weight is more towards the rear.

  10. #10

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    Thanks for all that good data!!

    And could we get down with this hull weight once and for all..

    Are the new 03 hulls really lighter? How much? (No guesses thanks!

    Thanks!

    Quote Originally Posted by Duke View Post
    Kinda what I came up with only by feel. The newer Efi hulls are much lighter and weight is more towards the rear.

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