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  1. #1
    "just sayin".. jetdave56's Avatar
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    riva sponsons vs stepped up stock sponsons

    like to hear some feedback on there sponsons, better cornering and handling etc, design seems different, most gpr guys are running including myself stock stepped up, i was thinking stepped up on there pair, what do you think?


  2. #2
    OLD # 7 IEGPR's Avatar
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    Turning hook is better but you scrub speed. Nothing beats stock steped for speed.

  3. #3
    Hydrotoys's Avatar
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    Yup. Personal preference.

    Try this test...

    Ride the stock ones stepped.
    Ride the stock ones flat down. (mimic aftermarket sponsons)

    Whichever way YOU LIKE IT, that is how you should run them.

  4. #4
    "just sayin".. jetdave56's Avatar
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    stepped up

    thanks, but how do you think it would handle if i stepped up the rivas, might have to drill to make center hole fit., riva version to me looks like a sharper thinner design, but i'm only going by the picsClick image for larger version. 

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  5. #5
    32 Valves To Love! Racecar_Dave's Avatar
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    I have RIVA, no complaints other than i wish the logo said "riva racing" instead of "riva yamaha"

  6. #6
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    Quote Originally Posted by jetdave56 View Post
    thanks, but how do you think it would handle if i stepped up the rivas, might have to drill to make center hole fit., riva version to me looks like a sharper thinner design, but i'm only going by the picsClick image for larger version. 

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    i think the riva cant be stepped unless you rework the mounting plate.
    its not the angle of the blade but the backing plate.
    i was having somebody make me a staboard backing plate for the rivas(to try and stepp them) but it never got done,But as said above try yours a few ways then decide what YOU like ,everybody rides different ways on diff water..ie standing up over the bars,hanging on for dear life of the back,all weight on the outside of a turn,all weight on the inside of a turn....ect ect...
    just go ride and test and ENJOY
    mattman

  7. #7
    "just sayin".. jetdave56's Avatar
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    hmm...

    i might just keep the stock sponsons stepped up, she G-turns sharp already, corners like its on rails, for $240 plus it not worth minimal performance gains you might somehow gain.

  8. #8

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    Quote Originally Posted by jetdave56 View Post
    i might just keep the stock sponsons stepped up, she G-turns sharp already, corners like its on rails, for $240 plus it not worth minimal performance gains you might somehow gain.
    Not so.

    The RIVA sponsons are spectacular compared to the stock sponsons in closed course racing. But then again, that is what they are designed for. The only way you could tell this is to put yourself on a course and compare one to the other. Your confidence level goes way up when it comes to aggressive turning on RIVA sponsons vs. the stockers.

    Take a pencil and mark a line at the bottom of the stock sponson at its full length against the hull (while they are mounted). Then step the sponsos and mark another line, you will see how much lower in the water the back of the stepped sponsons ride. Then if you were to do the same with the RIVA sponsons, you will find that the whole RIVA mounting plate rides about 3/8-1/2 inch lower in the water vs. the stockers. This (along with the added length of the blade) is why the boat corners better with the RIVA and at the same time why they are slower in straight line racing. The RIVA sponsons keep you on track better in rough turning conditions and so help you gain lots of speed in the corners even though you may loose speed in the straight-aways.

    Closed course racing is turning, accellerating, and putting yourself in the right positon to make the best turn on the next bouy. It has very little to do with top speed. At the end of a race in these conditions, you are much further down the track with RIVA sponsons vs. stockers.

  9. #9
    "just sayin".. jetdave56's Avatar
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    riva sponsons

    i guess its a compromise between what you gain in speed cornering and and what you might lose in straight accel., something to think about......

  10. #10
    32 Valves To Love! Racecar_Dave's Avatar
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    I notice my boat hooks way better out of the hole with the riva sponsons all the way down, as opposed to the stock depth, which I beleive is the riva's adjusted all the way up, correct?

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