Help with pump setup
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Help with pump setup

  1. #1
    gets 'em wet ultrajet's Avatar
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    Default Help with pump setup

    Hey guys,

    I'm thinking about changing my setup a bit and I'd like to get some opinions. I haven't changed anything with the boat since I purchased it and I'm wondering if I can improve the performance a bit. Boat has a dominator pump with AT trim and rooster booster. The boat porpoises quite a bit at lower speeds with the diverter up(even just a little) and has been porpoising at higher speeds(50+) with the diverter in what I consider the "sweet spot". At lower speeds I'm able to trim out of the porpoising by trimming down or increasing speed. Does this all sound normal considering my setup and should I consider getting rid of the rooster booster in favor of a droop and some wedging??



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  3. #2
    Senior Member jetboatperformance's Avatar
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    One vote here to "lose the rooster booster" then retry Tom

  4. #3
    B1 Racing cs19's Avatar
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    I'd lose everything from the bowl back, get a regular AMT droop and place diverter. AMT stuff is nice but I dont like their diverter.
    B1Racing.net

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  6. #4
    gets 'em wet ultrajet's Avatar
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    Quote Originally Posted by cs19 View Post
    I'd lose everything from the bowl back, get a regular AMT droop and place diverter. AMT stuff is nice but I dont like their diverter.
    AT makes a droop that fits my AT diverter. Is it really going to make that much difference to purchase a Place Diverter over my current diverter??

    Forgot to mention my rideplate is slightly warped as well. Could this be contributing to my problems as well??

  7. #5
    Senior Member Rivernut's Avatar
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    Trim tabs would fix this. My aluminum boat has two small welded ones. They set back only 2" and are bendable with a rubber mallet. Makes a huge difference. When set right the boat throws a huge rooster tail with no bounce.

  8. #6
    B1 Racing cs19's Avatar
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    probably not. just trying to help. good luck.
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  9. #7
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by Rivernut View Post
    Trim tabs would fix this. My aluminum boat has two small welded ones. They set back only 2" and are bendable with a rubber mallet. Makes a huge difference. When set right the boat throws a huge rooster tail with no bounce.
    that'd be attractive

    lose the roost booster and get a regular ole droop and divertor. my bud has that divertor and it sure limits ya on what hardware you can try.

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com

  10. #8
    Senior Member old rigger's Avatar
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    Originally Posted by Rivernut
    Trim tabs would fix this. My aluminum boat has two small welded ones. They set back only 2" and are bendable with a rubber mallet. Makes a huge difference. When set right the boat throws a huge rooster tail with no bounce.

    Quote Originally Posted by IMPATIENT 1 View Post
    that'd be attractive
    lol

    That tip should go in the rigging school thread.

  11. #9
    gets 'em wet ultrajet's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    that'd be attractive

    lose the roost booster and get a regular ole droop and divertor. my bud has that divertor and it sure limits ya on what hardware you can try.
    I agree. I wish the thing had a plain old Place diverter but it doesn't. I'm sticking with the AT diverter here. But I think I'll add the droop( the only one that will fit it)

    How about my rideplate? Does the rideplate being warped, even slightly, create the kind of problems I'm having??

  12. #10
    Senior Member Widetrack's Avatar
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    The rooster booster is a big part of your problem! Porpous is caused by the force of the water out of the nozzle causing lift in the bow! Kind of like lift and let go over and over. At WOT it is not as bad but with that degree of angle it has it will cause this! Ride plate should be as true as possible but I don't think it is the problem with your porpous!
    It all depends on what you want a high rooster or a good ride! WT


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
    WT

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  13. #11
    21 Daytona Outlaw's Avatar
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    My last boat had that exact pump SD309 with the AT "turbine trim"
    it ate those bronze steering and pivot bushings at least twice during the season, when they got loose it caused porpoise because the nozzle
    was moving around quite a bit. when I added a droop it made very little difference. the ride plate even with the keel was the best setting I found.
    #55

  14. #12
    What the Hell is That? 72Hondo's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    One vote here to "lose the rooster booster" then retry Tom
    X2

    I believe thats why they stopped making them, they made a bigger roost but the ride was horrible.
    Last edited by 72Hondo; 07-02-2009 at 02:12 PM.
    Quote Originally Posted by Kyle View Post
    Log off and go float, hang in the party coves, Show and shine on the trailer, fill up the boat, wax it, v-drive, jet, outdrive, and if you got a canoe and your reading this, you sir, need to phucking upgrade.

  15. #13
    gets 'em wet ultrajet's Avatar
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    Quote Originally Posted by Outlaw View Post
    My last boat had that exact pump SD309 with the AT "turbine trim"
    it ate those bronze steering and pivot bushings at least twice during the season, when they got loose it caused porpoise because the nozzle
    was moving around quite a bit. when I added a droop it made very little difference. the ride plate even with the keel was the best setting I found.
    School me here. Where can I check for these steering and pivot bushings?? Also isn't my pump a dominator 12-s??

  16. #14
    21 Daytona Outlaw's Avatar
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    maybe its a dominator, is the transom adapter molded to the pump housing?
    any way try and move the nozzle around by hand, if it has some play
    check to see if the bushings are worn. # 1 in the diagram and #25
    #55

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