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Thread: Sea Doo Hull

  1. #1

    Sea Doo Hull

    I am in beginning stages of building a monster. The plans are a 400 plus hp turbocharged 4 Tec running somewhere around 22lbs of boost. I am starting with a 2012 GTI as I have inherited it for nothing. Ia have read that this hull is not very good for speed. Any suggestions on what SEA DOO HULL would be the best option? I am thinking that the s3 hull would be the way to go, but I am are I am not going to be able to get my hands one at a good price. Would I be better off to put it in a 2004-2008 gtx/RXT hull or an RXP hull? Any suggestions would be greatly appreciated.


  2. #2
    boost junkie skidoochris's Avatar
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    IMO get the motor running before dumping the hull
    who will you be racing that you need max mph
    with a turbo you build boost so fast no SC skis will race you more than once
    what kind of kit are you getting
    WELCOME TO THE GH

  3. #3
    R88ory RXP's Avatar
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    For top speed, that hull is not so good but as a tuning platform its good and stable, handles well and all round is a good boat.

    If top speed is your goal then the yamaha gp1300 is still the fastest.

    The S3 hull is huge and so is not the best for top speed, but out in the ocean its good. New RXP-X T3 hull is very good.

    Many many options, but I would get the motor package working with what you have and go from there.

    R88

  4. #4
    shrabber's Avatar
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    22lbs boost turbo charged? Might want to kick it up or are you gonna fog it??. Also are you talking a short say 600-700 feet, If you are I take a SC with NOS. Good luck with your Project rxt Hull over the gtx or rxp for sure S3 Over them all.

  5. #5
    boost junkie skidoochris's Avatar
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    A SC over a turbo... well not with the junk stock brp SC housing
    How much HP does it take to make 20psi boost with a SC
    because it is zero with a turbo
    How do you stage your boost or use traction control with a SC ... you don’t
    A SC does nothing better than a turbo and you can still us n2o with a turbo
    Also you don’t need to run stupid high rpms to get big boost
    These motors can make 500hp @ 8500 easy and the pump and valve train will be way more efficient

  6. #6
    R88ory RXP's Avatar
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    Quote Originally Posted by skidoochris View Post
    A SC over a turbo... well not with the junk stock brp SC housing
    How much HP does it take to make 20psi boost with a SC
    because it is zero with a turbo
    How do you stage your boost or use traction control with a SC ... you don’t
    A SC does nothing better than a turbo and you can still us n2o with a turbo
    Also you don’t need to run stupid high rpms to get big boost
    These motors can make 500hp @ 8500 easy and the pump and valve train will be way more efficient
    Yup.... 100% agree.

  7. #7
    shrabber's Avatar
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    Quote Originally Posted by skidoochris View Post
    A SC over a turbo... well not with the junk stock brp SC housing
    How much HP does it take to make 20psi boost with a SC
    because it is zero with a turbo
    How do you stage your boost or use traction control with a SC ... you don’t
    A SC does nothing better than a turbo and you can still us n2o with a turbo
    Also you don’t need to run stupid high rpms to get big boost
    These motors can make 500hp @ 8500 easy and the pump and valve train will be way more efficient
    Yes SC Over Turbo For Me
    1. I want it Now dont want lag or waiting around Once again Im dragging. If I want to run a Marathon I will prop It to the Moon and Hang a dr seuss Rig out the Back.
    2. I dissagree SC does nothing better than a turbo? Please explain you get sh*T out of the hole with turbo
    3. Sure 8500 Is more efficent But 9800 RPM is More HP
    4. I dont Know How much Hp It Takes to Make 20 Pounds of Boost (on a 4tech) But I will Know What My actual true compression ratio will be and Once Im done Im sure I can Give you a Close answer.
    5. As Far as the Brp Housings Go I think Nils and Et are doing a Pretty Dam good Job with Them
    You have some great questions and im not here replying to debate or disagree Its just my opinion. I have not played with a Motec Yet....... I have messed with another system for our car.

  8. #8
    boost junkie skidoochris's Avatar
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    I can guarantee you my turbo problems will not be lag
    it will be traction; I will have way more problems with cavitation
    I will take max torque rpms over max HP rpm any time
    You cannot make a stock or piggyback system spool up like a stand-alone ecu
    Anti lag systems can build boost at 4000 and by 5000 be at 20psi (that is why you need to stage the boost)
    Compression ratios makes no difference when you have knock control
    you just run the most advance and boost you can with out knock and go like hell
    I hope the OP will tell us about his system
    Last edited by skidoochris; 12-04-2012 at 10:14 PM.

  9. #9
    Definitely going to be a turbo machine. I am currently working on the motor. Thus far I have balanced and cut crank and cam. CP/Carillo pistons, rods and head gasket. Lightened cam gear and flywheel. Full race head. 80lb Bosch injectors. ARP head and main studs. Still deciding on intak manifold. As for ECU I am still on the fence.......MoTeC or VTECH most likely as if I stay in an I control machine, I would like to have the option to keep the IBR. Also still need to do more homework on the turbo setup.

  10. #10
    I am not getting into the center of this debate other than to say that it is not true that turbos don't suck HP from the engine because they absolutely do. The HP needed to drive the centrifugal blowers that are common to both is the same, it is just the turbo extracts it from the exhaust flow instead of from the crankshaft.

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