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  1. #1
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    Turbo Honda outboard

    Why has this not been done? It just seems to me that it would be a given that somebody with the required knowledge would have done a turbo application on a Honda outboard by now.

  2. #2
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    I don't think their gearcase could hold the torque of more horsepower.

  3. #3
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    Quote Originally Posted by 89LASER View Post
    I don't think their gearcase could hold the torque of more horsepower.
    I have been keeping my eye out for a K-20 Honda outboard. Worse case maybe put a sport master on it. I already have a couple turbo's laying around that are 300-400hp range.
    http://i35.tinypic.com/epn6ma.jpg

    Just a little Cat.

    24 Twister V8 E-Rude (For Sale)

    2008 Concept Sport Deck 2x 300X

  4. #4
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    There's a guy that did it in FL. Made the local news, then went national and was covered here. I believe they have issues with engine management though. They contacted us here at Dynojet about it, but we could only offer fuel control and they wanted timing control as well.

    https://www.mynews13.com/fl/orlando/...-marine-engine
    Keith-

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  6. #5
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    Honda and Tohatsu are the same product in the newer large four stroke outboards. 1.86 ratio with questionable strength if you were to surface it. The clamp assy. was not something I even wanted to deal with on my toon in rough LOTO conditions but the fuel efficiency, driveability, and overall refinement was great. They were never intended for high speed applications.

    Joe

  7. #6
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    Quote Originally Posted by STV_Keith View Post
    There's a guy that did it in FL. Made the local news, then went national and was covered here. I believe they have issues with engine management though. They contacted us here at Dynojet about it, but we could only offer fuel control and they wanted timing control as well.

    https://www.mynews13.com/fl/orlando/...-marine-engine
    Yeah i saw the stuff they did on the V6.

    https://www.haltech.com/product/ht-1...lite-2500-ecu/

    That is the ecm they need to be able to tune the motor and make it work. If i was to do it i would start with the 115hp honda which is the K20 motor because of all the aftermarket support and try and boost it to the 300hp range. That motor can spin really good RPM then put it on something light for a boat so it is not TQ dependent to get out on plane.
    http://i35.tinypic.com/epn6ma.jpg

    Just a little Cat.

    24 Twister V8 E-Rude (For Sale)

    2008 Concept Sport Deck 2x 300X

  8. #7
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    I know of one person building wingplates for the Tohatsu 250hp engines... seems like two are going on a Cat in Florida.
    David "Tango" Wilks

    Current boats: (Not All Running...LOL)
    18' VT-Rocket Bass Boat: 2.5L 280 Mercury
    21' Eliminator Daytona: Stripped and Possibly For Sale!
    24' Skater: Uncut, Not Rigged and Possibly For Sale!
    30' SeaRay 290 SunSport SLX: twin 3.0L Duramax diesels & Bravo3 drives
    52' Sunseeker Predator twin Volvo-Penta IPS900 diesels

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  10. #8
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    Quote Originally Posted by STV_Keith View Post
    There's a guy that did it in FL. Made the local news, then went national and was covered here. I believe they have issues with engine management though. They contacted us here at Dynojet about it, but we could only offer fuel control and they wanted timing control as well.

    https://www.mynews13.com/fl/orlando/...-marine-engine

    Question asked and answered. Thanks

  11. #9
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    Oh yeah?

  12. #10
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    Quote Originally Posted by JPEROG View Post
    Honda and Tohatsu are the same product in the newer large four stroke outboards. 1.86 ratio with questionable strength if you were to surface it. The clamp assy. was not something I even wanted to deal with on my toon in rough LOTO conditions but the fuel efficiency, driveability, and overall refinement was great. They were never intended for high speed applications.

    Joe
    There was a guy overseas with a 250 Honda on a Argo it ran over 100 with stock lower and a huge prop. No nose cone either just transom pickup. No need for a cone when it’s not in the water any way. He planned on supercharging it but don’t think it ever happened.
    Quartershot T-3R 15" 3.5L E-Tec 1.62 Sportmaster


  13. #11
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    https://youtu.be/PZm11iP0EUU

    yet another perfect example why bobs plates are junk.
    Quartershot T-3R 15" 3.5L E-Tec 1.62 Sportmaster


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  15. #12
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    KEITH , A coworker of mine was involved in that project . I offered them the Xb02 for a test mule , but they where not interested . I don't think they understood the difference it could have made !

    Rich Martin 018
    HAVE BATTERIES , WILL TRAVEL !!!

  16. #13
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    Honda is not interested in a high performance outboard so they more than likely asked or even paid the guys to stay away from that. If Honda wanted to I`m sure they could take the high performance outboard world by storm.

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  18. #14
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    Seems like a R1 super bike engine would make a good candidate. 1 liter, 200hp and 14,000rpm. Grated a bit low on toque at 80ft lbs.

  19. #15
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    Quote Originally Posted by tnelsmn View Post
    Seems like a R1 super bike engine would make a good candidate. 1 liter, 200hp and 14,000rpm. Grated a bit low on toque at 80ft lbs.
    Maybe on a kneel down with a tiny prop....Doug and I get a few things out of the way we will get to it. We are on a tin boat mission right now so when those are done we will see. I've been in a lot of Honda gearcases and don't see a problem there. The metallurgy of the gears is excellent, and the propshafts are very forgiving. Plus they are basically parts binned from their automotive and the tuners have been modding those motors for 20 years.

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