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  1. #1
    Site Admin Green Hulk's Avatar
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    GreenHulk GP1800 / VXR Intake Grate Shootout

    I finally got a chance to go to the water and back to back test all three available intake grates for the GP1800 and 2015 and newer VXR skis.
    Grates tested were the RIVA Grate, R&D Grate and the WORX Grate. All grates had the optional pump seal kits installed.

    All tests were done within 40 minutes or less of one another. All runs were in the same direction on the same waterway.
    Tests were conducted with 1/2 tank of fuel
    Temperature of todays tests was 77 degrees F

    You will notice that acceleration data begins at 10 mph. This is because a jetski is not stationary in the water like a car, so I chose to begin acceleration data at 10 mph.

    The GP1800 test ski has the GreenHulk Stage 3 kit on it, with the only alteration to the kit being The Ultimate Air Intake kit, both shown below.

    Engine RPM on all tests was 9000
    A video overview of all 3 grates can be seen here


    GreenHulk GP1800 Stage 3 Kit

    This kit consists of the following components: This kit utilizes the RIVA MaptunerX tuning bundle package which will reflash your skis stock ECU to...
    GreenHulk GP1800 Stage 3 $5,346.45
    Sale: $4,811.81
    10% discount




    "The Ultimate" Cold Air Intake Kit for All Yamaha Waverunners

    "The Ultimate" cold air intake kit will fit all Supercharged Waverunners, both SHO and SVHO models. The kit is easily installed into the front...
    ULT YAM Kit $224.95 $199.95
    11% discount




  2. #2
    Site Admin Green Hulk's Avatar
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    The first grate I tested was the RIVA intake grate, this was also our fastest and quickest intake grate.

    While our Garmin hand held recorded a max speed of 87.6 mph, the VBox Sport recorded 87.1 mph
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  3. #3
    Site Admin Green Hulk's Avatar
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    Next up was the R&D grate. Our hand held Garmin read 87.8 mph, while the VBox Sport recorded 87.4 mph
    This grate was a big faster than the RIVA grate on the first run (above), but has slightly slower acceleration due to more cavitation on hole shot.
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  4. #4
    Site Admin Green Hulk's Avatar
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    Next we tested the WORX intake grate. This grate had quite a bit more cavitation on hole shot than the R&D grate which caused acceleration times to suffer. Top speed was also a little less than the RIVA and R&D intake grates. Top speed recorded on our Garmin was 86.8 mph, while the VBox Sport recorded 87.4 mph
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  5. #5
    Site Admin Green Hulk's Avatar
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    Since the RIVA grate gave the best overall results I decided to put it back on and test it again to see if I could duplicate the numbers from the first run when the ski was cooler. The acceleration and top speed numbers on the heat soaked ski were very close with the Garmin reading 88.0 mph and the Vbox sport registering 87.2 mph
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  6. #6
    Site Admin Green Hulk's Avatar
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    In summary, the RIVA grate provided the best overall performance resulting in better acceleration numbers and top speed numbers.
    My feeling is that the better acceleration of the RIVA grate is due to the design of their pump seal kit. It sealed better just by bolting the grate up.
    I feel that the acceleration numbers of the R&D and WORX grates could be greatly improved once the intake grate is sealed up with silicone, as should be done.
    It's just impossible for me to do a true back to back test by sealing each grate into the hull, letting it dry overnight and testing. Testing needs to be done back to back, within minutes apart if at all possible for a true comparison.

    I hope you guys enjoyed the video and the review of each grate. I hope that if you choose to purchase one of these grates for your GP1800 or VXR Waverunner that you choose to shop in the GreenHulkStore.com. As always, use the discount code: greenhulk to save 10% off the listed price of most RIVA and R&D products, all WORX Racing Products and all Solas impellers.


    R & D Yamaha GP 1800 / 2015+ VX/VXR/VXS Aquavein Intake Grate

    The R&D Yamaha GP 1800 Aquavein Intake Grate Kit has been designed and developed to deliver the ultimate handling and top speed performance in...
    112-18005 $299.95


    R & D Yamaha GP1800 Pump Seal Kit for R&D grate

    For RD aftermarket scoop grates! R&D's new pump GP1800 seal kit stuffs up all the unwanted cavities in the pump shoe that aid in producing...
    162-00023 $73.45

    RIVA Yamaha GP1800/VXR/VXS Top-Loader Intake Grate

    Our revolutionary new intake grate for GP1800, VXR and VXS delivers the ultimate in speed, hook up & strength. All new design features oversized top...
    RY22110 $299.95


    RIVA Yamaha GP1800 Pump Seal Kit

    Available May 20, 2017. Pre order now for first availability Dramatically reduce cavitation and prop spin with our easy to install Pump Seal Kits....
    RY25110 $79.95


    WORX Intake grate for GP1800 & 2015+ VXR

    The Yamaha GP1800 SVHO, 2015+ VXR is the ultimate fun machine and it is with great excitement Worx Racing Components bring to you their WR246 Intake...
    WR246 $240.00


    WORX Pump Seal Kit for WORX GP1800 Intake Grate

    Recommend for the WR246 Intake Grate this pump seal kit will easily fit into the voids of the grate to not only reduce cavitation but maximize pump...
    WR0710 $98.00



    Thank you for your business!
    Jerry Gaddis


  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Green Hulk View Post
    .. I feel that the acceleration numbers of the R&D and WORX grates could be greatly improved once the intake grate is sealed up with silicone, as should be done.

    It's just impossible for me to do a true back to back test by sealing each grate into the hull, letting it dry overnight and testing. Testing needs to be done back to back, within minutes apart if at all possible for a true comparison...
    Reduced acceleration test results due to air gaps between the intake grate and the transom plate or ride plate (effectively without proper sealing).

    For riders more interested in acceleration rather than top speeds, it is still unclear whether any of these three intake grates is noticeably better than the other two.

    Essentially the acceleration test results mostly reflect how well the intake grate sealed itself using the factory rubber strip without any other sealant applied. Additional sealing could significantly affect the acceleration ranking.

    Owners who are interested in the maximum performance with any of these intake grates would seem likely to benefit from applying additional sealing beyond what the factory rubber strip provides.

    For my own GP1800 WORX intake grate I did apply extra sealant to ensure there would be no air leaks. The result was significantly improved acceleration from low speeds with less impeller spinning during launch. I had a couple of small air leaks after the initial install and the effect was quite noticeable. Proper sealing corrected that.

    Perhaps what is needed is side by side testing of three very similar GP1800 (say Stage 1 tuned), with a properly sealed intake grate of each type. This would also allow for some rough water ride comparisons, which I would certainly find interesting.

  8. #8
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by k447

    Perhaps what is needed is side by side testing of three very similar GP1800 (say Stage 1 tuned), with a properly sealed intake grate of each type. This would also allow for some rough water ride comparisons, which I would certainly find interesting.

    Performance of one ski will will vary to the next even when identicaly modified. Not to mention variables in rider weight and riding style. You are not going to get a true back to back comparison of intake grates with this method. Good luck with that!!!

    The above results are just baseline numbers, you can expect all three of the above tested intake grates to produce even better acceleration numbers due to reduced cavitation once properly sealed into the hull.

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  10. #9
    Chupacobra's Avatar
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    This is some bad ass testing..

    The v box is as legit as they come for data testing. Very popular in the 60-130 pulls in the automotive world.

    Lol at 7.06 et in the 1/8

    That's faster then some bolton Nissan GTRs lmao


  11. #10
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by Chupacobra View Post
    This is some bad ass testing..

    The v box is as legit as they come for data testing. Very popular in the 60-130 pulls in the automotive world.

    Lol at 7.06 et in the 1/8

    That's faster then some bolton Nissan GTRs lmao

    Thanks brother!! I love the VBOX too. It’s a must have tool for any comparison testing

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