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  1. #1

    Kawasaki 15f turbo

    Was wondering if anyone has done a turbo set up on a 15f i see k speed has the stx 310 and that thing looks amazing!!
    Why doesn’t anyone turbo a 15f ?
    It seems like they could pull really good speed numbers since the hull is like 7mph faster then the ultra

  2. #2
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    It is quite a bit of work/money to do properly.

    Stock compression ratio is too high and pistons aren't available anymore.

    The exhaust system isn't easy or cheap to adapt to a turbo flange.

    The pump is marginal above 220ish hp.

    The ecu/map sensors are geared toward a non-boosted motor.

    You are realistically looking at upwards of 6k to get close without tuning assuming you diy some parts.

    Even if you have the parts already, there is a ton of little detail stuff that you should do that is already done on the boosted motors. The boosted skis have revised crankcase vents, piston crown thickness differences, piston oil squirters, bigger jet pumps, and different exhaust manifolds.

    You would be way better off doing a full motor swap at this point since the na and boosted motors are physically similar enough to interchange with minimal work.

    Sean

  3. #3
    Quote Originally Posted by smokeysevin View Post
    It is quite a bit of work/money to do properly.

    Stock compression ratio is too high and pistons aren't available anymore.

    The exhaust system isn't easy or cheap to adapt to a turbo flange.

    The pump is marginal above 220ish hp.

    The ecu/map sensors are geared toward a non-boosted motor.

    You are realistically looking at upwards of 6k to get close without tuning assuming you diy some parts.

    Even if you have the parts already, there is a ton of little detail stuff that you should do that is already done on the boosted motors. The boosted skis have revised crankcase vents, piston crown thickness differences, piston oil squirters, bigger jet pumps, and different exhaust manifolds.

    You would be way better off doing a full motor swap at this point since the na and boosted motors are physically similar enough to interchange with minimal work.

    Sean
    Thanks for the reply you make a really good point on all the little parts from the na to the supercharged motors
    So what if you could take a ultra 300/310 motor put je pistons Carrillo rods and valve train
    Motec or another stand alone probably motec since there is more tuners out there to help tune it in
    Just throwing around ideas just wondering if there is a Kawasaki set up that could run with a gp1800 on flat water not hating on the gp had a gp last year would run 90mph but I do really like Kawasaki

  4. #4
    Quote Originally Posted by smokeysevin View Post
    It is quite a bit of work/money to do properly.

    Stock compression ratio is too high and pistons aren't available anymore.

    The exhaust system isn't easy or cheap to adapt to a turbo flange.

    The pump is marginal above 220ish hp.

    The ecu/map sensors are geared toward a non-boosted motor.

    You are realistically looking at upwards of 6k to get close without tuning assuming you diy some parts.

    Even if you have the parts already, there is a ton of little detail stuff that you should do that is already done on the boosted motors. The boosted skis have revised crankcase vents, piston crown thickness differences, piston oil squirters, bigger jet pumps, and different exhaust manifolds.

    You would be way better off doing a full motor swap at this point since the na and boosted motors are physically similar enough to interchange with minimal work.

    Sean
    By the way I have read your post over the years
    And you have had some awesome Kawasaki builds !!!!

  5. #5
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Thanks!

    If you are doing pistons and rods, the base motor doesn't matter anymore as long as you start with a 1500 and not the 1200. Most people don't want to spend the money on those though so starting with a 300/310 motor as a base makes sense as long as you are only planning on 350ish hp. One benefit that the 300/310 motors have is that they come setup with knock sensors and you can't easilly retrofit those to the na motors.

    My riva vortech h-trim motor (430hp) ran stock rods, valve springs, and stock compression pistons with a base spacer between the cylinders and crankcase when I got it.

    When I finally get around to building it, I have custom mtc pistons and carillo rods, ferrea valve, ape springs, ti retainers, and cam gears going in. I am also retrofitting the piston oil squirters.

    Running a motec or standalone is the only way I would go anymore.

    Sean

  6. #6
    Quote Originally Posted by smokeysevin View Post
    Thanks!

    If you are doing pistons and rods, the base motor doesn't matter anymore as long as you start with a 1500 and not the 1200. Most people don't want to spend the money on those though so starting with a 300/310 motor as a base makes sense as long as you are only planning on 350ish hp. One benefit that the 300/310 motors have is that they come setup with knock sensors and you can't easilly retrofit those to the na motors.

    My riva vortech h-trim motor (430hp) ran stock rods, valve springs, and stock compression pistons with a base spacer between the cylinders and crankcase when I got it.

    When I finally get around to building it, I have custom mtc pistons and carillo rods, ferrea valve, ape springs, ti retainers, and cam gears going in. I am also retrofitting the piston oil squirters.

    Running a motec or standalone is the only way I would go anymore.

    Sean
    So your saying the 300/310 motors are good till 350hp before upgrading internals ?
    What can these motors be brought to if the internals are upgraded ?

  7. #7
    Let me out of here......I need to go on Greenhulk!
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    310 motor wont fit in a 15f hull. Knock sensor is easy if the ecu has a channel for it.

  8. #8
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Quote Originally Posted by TMiller View Post
    310 motor wont fit in a 15f hull. Knock sensor is easy if the ecu has a channel for it.
    The 15f block doesn't have the mounting bosses for the knock sensor though. You can modify the jugs but you have to be specific about where and how it is positioned.

    Blackrxp did the 250x swap on a 15f a few years back, you can get it to work but you have to bubble the hull.

    http://greenhulk.net/forums/showthread.php?t=108033

    Sean

  9. #9
    Let me out of here......I need to go on Greenhulk!
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    310 motor does fit in the stx160 like was said earlier.


  10. #10
    ANTONYUK's Avatar
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    Quote Originally Posted by Driptohard678 View Post
    By the way I have read your post over the years
    And you have had some awesome Kawasaki builds !!!!
    I have for sale last version R&D turbo kit and turbo pipes kit for Ultra 250/300/310 engine
    http://foks-moto.ru/shop/vodnomotorn...50-260-300-310
    http://foks-moto.ru/shop/vodnomotorn...tra250-300-310
    I have additional Motec M400 ECU kit for Ultra 300/310

    Details pm motofoks2008@mail.ru

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