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  1. #11
    cheatin' piston popper addicted's Avatar
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    Quote Originally Posted by mrbtd View Post
    Few quesitons...

    On the GPRXP....The tuning box is the large black box that had the white stuff on it right ? If so we call it a Sound Suppresion box.

    It looks like even with the Sound Suppresion box the flow numbers are the same as the GH shorty set up ? From what I have read this is a good gain over the OEM set up.

    Obviously there is a huge size difference with the Yamaha OEM box - Does the size have anything to do with sound or performance ?
    The gpr waterbox is the same diameter as the oem seadoo box. the yamaha box is about 3" longer once the inlet nipple is cut off.

    The way the gpr box is designed, at least the 1200, the exhaust has to loop around the back, then out the middle. the oem seadoo boxes just have a divider between the in and out.

    My guess is that since the gpr plumbing is nearly 2x the size of the 4-tec exhaust, 3.5" Vs. 2", it is going to flow more. . . looks like the #'s agree.

    here are a few pics of the 1200 waterbox that I have on my conversion. I cut a 2.75" diameter hole in the baffle, and trimmed the outlet pipe as close to flush as I could on the inside. Unfortunately that was way too loud for my taste. good news is that a uncut 1200 box, or better yet a1300 box will flow well and be much quieter. . for those of us that want that
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  2. #12
    cheatin' piston popper addicted's Avatar
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    COuld a mod copy this to the conversion section? Really good info here

  3. #13
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    Quote Originally Posted by beachbum0286 View Post
    Great work Danny!! Got any ideas as to how to mod the X water box yet?

    I have been looking over your box with a fine tooth comb, and it looks to be very well designed for efficiency and mass production, but it does not look like much can be gained. I have only a few ideas that I will try out...

    Yea Billy, tuned box is what we put in the spread sheet, it was shorter than SOUND SUPPRESSION, it didn't screw witht he columns

    The yamaha box flows better because of the larger openings. Look at the IC setups, just going from 2.5 to 3" on the XS and Piranha cuts flow by 75%...

    But remember, I can't account for water injection and its physical displacement...

    Quote Originally Posted by addicted View Post
    COuld a mod copy this to the conversion section? Really good info here
    I already put a link there earlier...

  4. #14
    Hydrotoys's Avatar
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    The TDR flowed an AMAZING 3.0 in/water, while the OEM box came close at 3.6 in/water.
    Who's yer Daddy!!! That is the MC1 TDR box. The "shorty" box for the RXP/T will flow differently due to the smaller outlet.

    Good work Danny.

  5. #15
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    Quote Originally Posted by addicted View Post
    so if the 08 straight pipe flowed 5.4" and the yamaha 2 stroke exhaust flowed 7.3" would it be accurate to say that the combo that I'm unning on my coversion is roughly the sum of those 2 for a total of 12.7"?
    I can try to flow it, but I don't think I would get the angle the same, which would make a difference...but seeing your setup, I would think it flows around the 11's total, maybe a hair less...Adding the numbers don't work...

  6. #16
    cheatin' piston popper addicted's Avatar
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    That's awesome. Now I need to find a 1300 yammi waterbox and make that fit my conversion. Then I can send you my original one if you want. I'm after electric motor quiet

  7. #17
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    Quote Originally Posted by addicted View Post
    That's awesome. Now I need to find a 1300 yammi waterbox and make that fit my conversion. Then I can send you my original one if you want. I'm after electric motor quiet


    no need to send, as long as the boxes are constructed about the same, then their flow numbers would be relatively close...Just concentrate on the transition of the waterbox outlet, making it flush as possible on the inside of where it passes through...

  8. #18
    Site Admin Green Hulk's Avatar
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    Nice work Danny

  9. #19

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    have you ever texted a seadoo 2 stroke water box like a 720 xp?,,,i have one laying around im thinking of putting it in to a 03 sc gtx


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