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  1. #1
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    How to make my 30" 3 liter sound more like this (video) or a Pro-XB

    How can I make my 250 EFI Offshore with 30" shaft sound like a Pro-XB, or like the motor in this video?
    https://www.youtube.com/watch?v=xJzXMAeG87E
    How on Earth are they getting those two different frequencies that are offset from each other in that video, making it sound like twins?

    I should mention, my particular motor has exhaust tube 8263841, in the first picture. Interestingly, later years of the 30" Offshore motor used 833116A7, which is the SAME exact part number for the Pro-XB exhaust tube (second picture). How can this be when one's 30" and the other 20"? And how does this affect the sound?
    Click image for larger version. 

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    Also, will switching my ignition and fuel computers with those from a Pro-XB affect the sound? And how would it affect performance?

  2. #2
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    Surely someone must have some sort of idea?

  3. #3
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    So I can answer the question about how a 20" tuner can be the same as the 30" tuner. This is the case because there is a shelf in the can that that gasket and the tuner/liner sit on. In the 20" XB can this sits almost at the bottom of the midsection, and in the 30" mid the shelf will be like 10" up from the bottom of the mid. Even the early tuners were all the same between the 20/25/30 inch motors. In general thats how mercury did it. 25 hp motors, 2.0/2.4/2.5, 3.0 ... they most all have a set size tuner regardless of driveshaft housing length.

    I've seen some 30" mids that have exhaust reliefs about 20" down from the top, and others that direct the exhaust all the way down to the cavitation plate 30" down. If your mid has the reliefs 20" down then the sound would be drastically different than a full length exhaust one. Maybe post pics of your mid from the ground looking up?

  4. #4
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    25two.stroke, thanks a bunch, very interesting info! In about a week I should be able to pull the LU and get some pics.

    In the meantime, anyone know the answer to the ECM question?

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