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For Only the Technically savvy

  1. #1
    Senior Member King Creole's Avatar
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    Default For Only the Technically savvy

    I have a friend with a large, deep Vee hull.

    With twin Mercury 1,100s the boat is reaching 122 mph at 5,400 rpm. While continuing to increase throttle the boat is going into Guardian mode at 6,400 rpm at approximately 145 mph.

    What are the possibilities that could be creating the situation for the boat to prematurely enter Guardian mode?

    The boat is running a set of 17 1/2 x 38" 5 blade Mercury labbed propellers.
    Chris Davidson
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    SpeedBoat Magazine


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  3. #2
    Senior Member EVILFORCE's Avatar
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    If it going in at 6400 rpm that is where it is programmed I would think.
    No Fool Like A Old Fool is there?

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    Senior Member rampgirlll's Avatar
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    Our BBC is on a chip. Which keeps it from going beyond a certain RPM. Sounds like the guardian is about the same thing. I'm sure it can be changed or taken out.
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  6. #4
    Senior Member King Creole's Avatar
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    6,500 is where limiter set from factory
    Chris Davidson
    Publisher
    SpeedBoat Magazine


    Philosophy for a Happy Life: "Someone to Love, Something to look forward to and Something to Do." Elvis Presley

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    Senior Member rampgirlll's Avatar
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    Prematurely at 100 difference...there is a joke here, but I don't know what it is.
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  8. #6
    a.k.a. "Mean Pair" Nice Pair's Avatar
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    Quote Originally Posted by rampgirlll View Post
    Prematurely at 100 difference...there is a joke here, but I don't know what it is.
    As rampgirlll stated, within 100rpms?
    Change the chip to 7000rpm or put an inch of cup on the props.



  9. #7
    Senior Member King Creole's Avatar
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    Don't shoot the messenger. You know how some boys can be about their speed and size of their prop.
    Chris Davidson
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    SpeedBoat Magazine


    Philosophy for a Happy Life: "Someone to Love, Something to look forward to and Something to Do." Elvis Presley

  10. #8
    Senior Member rampgirlll's Avatar
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    Speed & prop size aren't as important as the driver skills & of course the tuner
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  11. #9
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    Quote Originally Posted by King Creole View Post
    6,500 is where limiter set from factory
    scan it it could be water pressure intake air temp ( with the air temp so high) the falt should be in falt history if I can't find the code I just record the engine during a run and email it to merc racing have them look at it without a scan tool your shooting in the dark

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