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  1. #16
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    Quote Originally Posted by DoktorC View Post
    Not without porting...The 300 is ported differently and even it has the same limiter. You're nowhere near running out of available prop pitch so I wouldn't really worry too much until you break 93...
    You guys crack me up!!!! James... It's gonna take more that "fuel curve" to get that whale into the 90's... I suspect you should just call Chuck and Hydro Dynamics now for a bottle. lol.
    "They hate us 'cause they anus."

    ]

  2. #17
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    Quote Originally Posted by Mitchie View Post
    You guys crack me up!!!! James... It's gonna take more that "fuel curve" to get that whale into the 90's... I suspect you should just call Chuck and Hydro Dynamics now for a bottle. lol.
    you guys are Ridiculous.... it not about all of the sudden being in the 90's.. its about making your motor better and if that ='s a mph then cool..

    And Rick we know my motor isnt ported. your like a Broken Record...lol yours is CRAAZY... we get it.

    Rick if there's more HP above the Rev limiter then why not run a smaller pitch and tap into it?
    22 Talon w/ 300 HPDI

  3. #18
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    I like the way you're all Thinking !
    1990 22' Activator Yami HPDI 300-sold
    1976 21' Challenger 2002 3.1 Yami 250 Vmax phase lll 89.7-sold
    1982 21' Superboat
    1990 22' Activator yami OX66 Vmax 250
    1982 30' Scarab-twin 200 Merc-sold
    1979 21' Challenger 300 Evenrude-sold
    1979 21' Superboat 200 Merc-sold

  4. #19
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    Quote Originally Posted by Jamescole View Post
    you guys are Ridiculous.... it not about all of the sudden being in the 90's.. its about making your motor better and if that ='s a mph then cool..

    And Rick we know my motor isnt ported. your like a Broken Record...lol yours is CRAAZY... we get it.

    Rick if there's more HP above the Rev limiter then why not run a smaller pitch and tap into it?
    My motor is NOT crazy...don't get me started on HT...my point was that it is easier to have your motor built to the 345hp spec than it is to try an mess with the fuel curves in the box. The fuel curve is NOT the rev limiter....you asked about fuel. There is only power above the limiter if its ported....and even with porting I ran my best speed at 6100....

    If you want to build a motor that is more extreme than what is currently available than yes FM won't only be a huge benefit but a necessity....for a stock motor with heads and BB throttles I don't see there being a benefit.

    the reference to the 93 wasn't an insult...sorry if you took it that way...it's the speed that the Tuff ran with the 300hpdi which obviously had the stock box on it. So, the limiter shouldn't be an issue until you get to those speeds..
    Last edited by DoktorC; 03-05-2013 at 10:54 AM.
    '08 SRV
    Yamaha 3.1 Phase III


  5. #20
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    James I never knew you to be so sensitive. My understanding is the ht ox66 have very, very mild porting. Richard is right. They are far from crazy.... Clearly the 300xs is making more power up top.
    "They hate us 'cause they anus."

    ]

  6. #21
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    Quote Originally Posted by lance View Post
    Another thought... the ECU takes inputs from several sensors including atmospheric pressure and air intake temp. I wonder if the electrical signals from these sensors could be changed slightly and therefore change the fuel curve? For example have the air intake temp tell the ECU it is actually at a lower temp and therefore more fuel would be added. I'm assuming the ECU works something like that?
    I'm not sure why we haven't seen some sort of external programmer that can do all of this. The Power Commander guys have all the bikes and sleds figured out. It would still be a pain in the ass to build maps but I know for the bikes/sleds they have timing control and the ability to move the limiter.
    '08 SRV
    Yamaha 3.1 Phase III


  7. #22
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    if you really want to put some more power out of an HPDI
    remove the system all together!!!
    in the attached patent file you can see how short injection times are page 7 and 8
    trying to pump more power at an higher rpm will go beyond the design limits of the system very fast
    even with Yamaha using higher injection pressure,s as the other manufactures

    you simply run out of time with a 1/4 or slightly more crank rotation of injection time
    (may be figure out how to increase the rail pressure but as long as the ecu is controlling rail pressure? )

    with through crankcase injection will give a 100% crank rotation injection time (theoretical)
    as you would want to stay with a 80% duty cycle

    in my opinion leave it alone or remove it all together
    and go for an after-market ecu

    save your money for when aftermarket piezo injection becomes available at an affordable price
    that can inject when ignition is already occurring
    Attached Thumbnails Attached Thumbnails US5699766.pdf  

  8. #23
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    Thats doesnt look like a Yamaha system although it is a basic DI lay out. Also Yamahas fuel rail pressure is not controlled by the ECU. Its control by a regulator in the high pressure pump, the ecu sees the rail pressure and adjusts accordingly to any fluctuations.
    Fellow G-Man of the Sunshine Syndicate-Dixie Wrecked Chaptor..
    We Put The F. U. in FUN
    94 17MA Maverick 115 Yamaha
    2006 Mustang GT, with a belt driven air cleaner

  9. #24
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    no it,s not the HPDI system but i put that there to the explain the same problem you run into
    "the limited time to inject"
    this becomes more problematic as rpm,s rise
    especially if you are going to port the block which will increase top fuel consumption at an higher rpm

  10. #25
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    any update on the ecu would be great

  11. #26
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    Quote Originally Posted by gm250 View Post
    any update on the ecu would be great
    Isn't there a Bender you can call about this stuff?? Lol...
    '08 SRV
    Yamaha 3.1 Phase III


  12. #27
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    Quote Originally Posted by gm250 View Post
    any update on the ecu would be great

    a BBC member has had good success doing his HPDI... i have been sifting Ebay looking for a ECU so i can send one in just to see.
    22 Talon w/ 300 HPDI

  13. #28
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    Quote Originally Posted by Jamescole View Post
    a BBC member has had good success doing his HPDI... i have been sifting Ebay looking for a ECU so i can send one in just to see.
    How many do you need? You honestly ought to know better lol.
    '08 SRV
    Yamaha 3.1 Phase III


  14. #29
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    Quote Originally Posted by DoktorC View Post
    Isn't there a Bender you can call about this stuff?? Lol...
    That's great doktorc you are no amateur you have a lot of good ideas.there are many different directions to go thanks for the input

  15. #30
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    how is the ecu working out?

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