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  1. #31
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    Stillwater MN
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    Jeez I dunno guys. The 3.3 Wayne built for me has all the power I need on my 20' Hydrostream open bow Voyager XT. It is ported with intake spacer, big bore throttle bodies, reeds, and tuner. I think that's all he did to it. Dyno sheet said 339hp at 6150. I have about 10 hours on it now and other than being a little cold blooded, it runs like a dream. Thinking a TPS tweak may solve the cold startup issues.

    My setup is definitely the limitation right now. I turn a 30" Drag 4 right up to the limiter and am running just south of 95mph in this old school bus. The HPDI is one heavy bastard, and I need to get it off the 6" setback and back onto the transom. Trouble is, then I'm too deep. Next winter will build another short shaft and get the motor up tight, then she should handle properly and let me really wring it out. The motor makes power, there's no question about that. That said, I'd sure like another 500rpm to play with.
    "Under Promise -- Over Deliver"
    • 1991 HydroStream Voyager XT (Waterski Magazine 1991) 225 HPDI
    • 1990 Hydrostream Voyager XT Stage II ProV 150 (For Sale)
    • 15' Pacecraft (For Sale)
    • Vipire -- Hydrostream Viper/Vampire hybrid
    • BB2002 (aka Ali-Shot) X-flow OMC
    • Hydrostream Vector project X-flow?
    • 2003 Mirage Ski Racer
    • G3 X22 RC Pontoon F70 Yamaha
    • Mini-toon w/ 15hp Mercury ProKicker
    • Smokercraft 24' pontoon w/ diving platform 50hp 4-str Mercury (For Sale)

  2. #32
    Join Date
    Sep 2013
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    Finland
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    http://www.yamaha-rebuild.com/Yamaha...%20Upgrade.htm

    Has anyone made this ecu update 3.3 hpdi ?
    P21 & 300hpdi

  3. #33
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    May 2017
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    Babylon new York
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    Quote Originally Posted by Finman View Post
    http://www.yamaha-rebuild.com/Yamaha...%20Upgrade.htm

    Has anyone made this ecu update 3.3 hpdi ?
    Also waiting for this reply.

  4. #34
    Join Date
    Jun 2002
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    Northern Utah
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    I've been following HydroTec's latest advances with the 3.3 HPDI ECU on the BBC site.
    At least one person has done the mod and had positive results. Here is the link to the BBC thread. I'm thinking about giving it a try but I'd like to see more feed back.
    http://www.bbcboards.net/showthread....t=#post7358501

  5. Likes 16ft superboat liked this post
  6. #35
    Join Date
    Oct 2008
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    longisland ny lindenhurst
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    this winter ill be upgrading my ecu as well. 102 with a 35p bravo on the limiter. simon and HT both can do the upgrade at the same price. which is better who knows.
    16ft superboat
    14ft vixan
    15ft viper
    24ft sleekcraft
    21ft sleekcraft modvp
    18ft action hst drag
    18ft accelerator drag
    21ft redline
    18ft vking yt 300 yamaha!


  7. #36
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    Sep 2013
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    I have put Hydrotec survey on the subject, but they do not bother to answer.


    Particularly I'm interested in whether this update really does have any power without powerhead ported, of course, it's useful if the engine power range is raised by raising the upper exhaust ports.


    I found this old message:
    "We only do the tune if u are in shop. Leaving it to the untrained has proven to be disappointing. We need to make sure the tune is correct and only way to do that is to use Yamaha diagnostic software. Also engine needs to be run and codes cleared!"Wayne Worthy #79

    http://www.bbcboards.net/showthread.php?t=715092&page=4&highlight=programming
    P21 & 300hpdi

  8. #37
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    Try them again. Wayne has been very good with replying in the past.

    As far as the jacked tune is concerned , when balancing these engines on the "edge" I would guess that Hydrotech is being cautious.

  9. #38
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    Sep 2013
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    Did anyone try to change the max ignition timing by turning the flywheel in a different position?

    In 3.3 liters of engines 200, 225, 250, 300 seems to have different curves in use, my next summer's plan is to enrich the mixture from the high pressure pump and try to move ignition adjustments.
    In my boat there is a 2-channel exhaust gas thermometer, and I install a knock sensor (microphone) engine for testing to be safe.
    Last edited by Finman; 11-20-2017 at 03:24 PM.
    P21 & 300hpdi

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