Absolutely Impossible To Tune Jet Boat.
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Absolutely Impossible To Tune Jet Boat.

  1. #1
    LP-25.com Infomaniac's Avatar
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    Default Absolutely Impossible To Tune Jet Boat.

    OK heres the deal.........

    Have tried to go out with 15 YO son in his Rogers Dragstar and tune the boat.

    The engine is running fine.

    Trying to tune in the pump/boat combo after a crude throw together get the entire thing going project.

    If I am in the boat. It porposises like the biggest piece of shit on the water. To the point of unbearable to ride in.

    When I get out, it runs and takes a set and goes like crazy.

    What is the deal ???

    We drilled the intake to take pressure readings. I can't ride in the boat to monitor them because the boat will not accept a rider.
    Damn, Talk about a sensitive setup.

    This is the damndest thing I have ever seen.

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    Senior Member jetboatperformance's Avatar
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    Ron lets see the "set up" (pics and info) Intake , hardware , driveline etc etc ...

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    Senior Member Brendellajet's Avatar
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    Best bet is to talk to people who have run that Rogers hull and get their setup info, and then make minor adjustments to suit your setup, weight/hull etc as even boats out of the same mold will respond differently at times.

    You could get the GPS out and work on max speed, but your best bet is to try and make minor adjustments at the track and use the first season as a learning curve. Season two you can start pouring it on.

    I assume you tried to trim the porpoise out?My dads boat has a nasty porpoise to it after a complete re-rig. Boat came with cav plates and no ride plate. Maiden voyage We left the cav plates off(ran out of time) and the rideplate too(forgot it). We are hoping the rideplate will fix the problem as the porpoise could not be trimmed. If it doesn't, we will know why the cav plates were on it to begin with...
    "He is a lover, not a fighter. But he's also a fighter, so dont get any ideas."

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  6. #4
    Engine junkie
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    Sounds like the boat needs something to sit on, put a ride plate on it.

    My old Avenger did the same thing, the ride plate made a world of difference along with adjusting the nozzle angle.
    Life's journey is not to arrive at the grave safely in well preserved body, but rather to skid in sideways, totally worn out, shouting"....holy shit.... what a ride!"

  7. #5
    LP-25.com Infomaniac's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    Ron lets see the "set up" (pics and info) Intake , hardware , driveline etc etc ...
    I'll see what I can do for pics this weekend Tom. I am going to speed coat the bottom.

    We did build the boat to race but damn. Would be nice to ride in it lol

    The boat handles fine with Info Jr in it by himnself.

  8. #6
    just a ski boat with bark Carnivalride's Avatar
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    Quote Originally Posted by Infomaniac View Post
    I'll see what I can do for pics this weekend Tom. I am going to speed coat the bottom.

    We did build the boat to race but damn. Would be nice to ride in it lol

    The boat handles fine with Info Jr in it by himnself.
    I'll say the boat seemed to run and set fine at Purcell, looks like your weight must throw the balance off. Since it looks to ride pretty flat with just your boy do you think it would need more wedge for you to ride in it?

    Loren

  9. #7
    Senior Member Futs's Avatar
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    Sounds like its real touchy with the center of gravity.

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    Senior Member hotbo's Avatar
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    from the pics i seen it was really wet looking,im gonna say the extra weight makes it worse causing it to bounce.

    best of luck,glad to see the father and son team are having fun.

  11. #9
    Senior Member H20MOFO's Avatar
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    This is probably overly obvious ....but as far as watching the gauges maybe you could rig up a vid. camera to record them. I do that when I go out because it's impossible for me to drive wot and watch the a/f, oil pres, tach,pump pres, water pres,ect,ect....
    Another Hot Boat refugee

  12. #10
    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by Infomaniac View Post
    I'll see what I can do for pics this weekend Tom. I am going to speed coat the bottom.

    We did build the boat to race but damn. Would be nice to ride in it lol

    The boat handles fine with Info Jr in it by himnself.

    Ron After re reading this I'm tending to agree think with Tim and Loren here, when initialy working on the set up my Sanger Circle boat porposed uncontrollably with just a driver but was relatively tame with a passenger added. As you know Boats are very weight & weight distribution sensitive .
    Clint, My freind who "campaigned" that same boat for years, went thru a multiude of set ups and changes ,intakes and harware etc, in its final seasons he consistanly ran 90s to triple digits and low numbers . when I spoke to him recently he said he'd share what he did if anyone needed help, call me and I'll try to put you in touch with him if you like
    Tom

  13. #11
    Member JR131's Avatar
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    HB at r&d marine has set up many of these hulls that have run very hard with no porpus give him a call 714 993-2665

    he will help you get it straight

    jr

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    Senior Member superdave013's Avatar
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    Quote Originally Posted by Futs View Post
    Sounds like its real touchy with the center of gravity.
    sounds like ol Ron needs to put down the fork to me.


    lol

  15. #13
    LP-25.com Infomaniac's Avatar
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    Quote Originally Posted by superdave013 View Post
    sounds like ol Ron needs to put down the fork to me.


    lol
    So how did I know that was coming ????

  16. #14
    Lord of the Drinks Havasu Hangin's Avatar
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    Quote Originally Posted by Infomaniac View Post
    So how did I know that was coming ????
    Tha person who can probably help you out best on the setup is Jenny Craig.

    "Warming the globe...16 cylinders at a time."

    Quote Originally Posted by Rexone View Post
    Perhaps I'm gay...

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