21' Open Bow Performance Mods
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21' Open Bow Performance Mods

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    Senior Member YumaJet's Avatar
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    Default 21' Open Bow Performance Mods

    So I'm kicking around the idea of adding a new 750cfm carb, intake and ignition system on my 21' open bow Ultimate. Aside from knowing its heavy and definately not a performance hull; I'd like to know if anything will be gained by doing those add on's. I won't be cutting down the impeller or adding an inducer. I'm sure someone here has done it and like to know if it gained a few MPH. Aside from breathing better and better response, anything else to gain? Its either buying the carb and adding a few extra speakers. Thanks in advance.
    boatless....

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    Would be good to know your existing setup before can make any comments on results of any upgrades.

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    Senior Member YumaJet's Avatar
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    Quote Originally Posted by fastmarlene View Post
    Would be good to know your existing setup before can make any comments on results of any upgrades.
    I have a bone stone sportpac marine power 454 bbc. Dominator pump with A impeller. Droop and ride plate. Thanks

    boatless....

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    Default 21 Ultimate

    Quote Originally Posted by YumaJet View Post
    So I'm kicking around the idea of adding a new 750cfm carb, intake and ignition system on my 21' open bow Ultimate. Aside from knowing its heavy and definately not a performance hull; I'd like to know if anything will be gained by doing those add on's. I won't be cutting down the impeller or adding an inducer. I'm sure someone here has done it and like to know if it gained a few MPH. Aside from breathing better and better response, anything else to gain? Its either buying the carb and adding a few extra speakers. Thanks in advance.
    The mods you have proposed are going to enhance the quickness and wil give you a slight gain in mph. Iwant you to check the right side bottom and see if there is a substancial hook on the bottom of the boat.It has been my experience
    this boat has a lot of hook in the bottom especially on the right side.

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    Senior Member YumaJet's Avatar
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    Quote Originally Posted by greg shoemaker View Post
    The mods you have proposed are going to enhance the quickness and wil give you a slight gain in mph. Iwant you to check the right side bottom and see if there is a substancial hook on the bottom of the boat.It has been my experience
    this boat has a lot of hook in the bottom especially on the right side.
    thanks for expert opinion. i know its hard to say how much mph i would gain, but im shooting for 5-10mph with alittle extra fine tuning on the stock motor. aside from the bottom being uneven, i didnt see much of a hook. the flat keel doesn't help with much either im sure.
    boatless....

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