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  1. #1
    MPower's Avatar
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    2008 Kawasaki 15F Twin Turbo



  2. #2
    That's awesome! I like the black turbo GTI pictured on page 3.

  3. #3
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    When you can remove the top deck like that, anything is possible! NICE JOB!

  4. #4

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    Can someone post the pic's here? I don't wanna sign up for the board. . .

  5. #5
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    I'll try
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  6. #6
    Quote Originally Posted by engineermike View Post
    Can someone post the pic's here? I don't wanna sign up for the board. . .
    Here ya go.
    Last edited by RXP-REX; 03-26-2010 at 11:32 AM.

  7. #7

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    Well that's interesting. I do have a concern, though.

    All compressors reach "choke" when the velocity of the air entering the compressor gets near sonic. A gas can not pass through an orifice at a speed greater than its sonic velocity due to the shock wave that sets up. So, if you know the size of the compressor inlet, you can easily predict the absolute maximum airflow the compressor can support. For example, if you put a GT28RS on a Pro Stock engine, you still won't make more than 400 hp.

    I understand they plan on piping the outlet of one compressor up to the inlet of the other. This is fine, but you will always be limited to choke flow on the first compressor. You could put a dozen of those things on an engine, and you still won't make any more power because of choke in the very first one. His turbo's look very small, so I wonder if he accidentally built-in a hp limit.

    The GT2876R would make a good selection for the first turbo of the 2. Its abnormally large compressor and small turbine would allow a lot of air flow and still be able to spool up on only 2 cylinders (eventually). Then, a GT2860R would work well as the 2nd one. The second turbo can be much smaller since the air is much more dense going through the compressor eye. This would still be a slow spooling combo, though, because a GT2860 spools quick, but with all 1500 cc blowing through it rather than just 750 cc.

    Ideally to accomplish the stated goals, you'd have to use 2 GT15's, but have a 76 mm cold side on the first one (custom made). You'd have to intercool it between the 2 compressors and then again after the 2nd one. You would also have to run 15 psi boost from the first turbo, then go on to 20+ out of the 2nd one. The end result would be 450+ hp capability with spool about like a GT2860, which is only capable of 360 hp. No thanks. Way too much complication, things to go wrong, piping, difficulty working on it, difficulty tuning it, etc. . . all for slightly quicker spool-up, when you coulda just installed a GT2871R and got 460 hp capable turbo and pretty quick spool also.

    Mike

  8. #8
    Website may not be suitable for small children WOT's Avatar
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    Quote Originally Posted by engineermike View Post
    ...I understand they plan on piping the outlet of one compressor up to the inlet of the other...

    I think they plan on running them parallel, rather than sequential. Otherwise, yeah they would run into choke flow. What is interesting though is that they are pairing up 2 cyclinders to each turbo and then maintaining the isolated exhaust feeds all the way out the back of the boat. If their EGTs are not consistent, they may run into tuning problems....

  9. #9
    Fat Man, Little Boat Region8Ultra250X's Avatar
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    i don't think they are gonna have issues with the turbo or tuning on the boat.... lets jsut say its got some rather decent engineering behind it.

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