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  1. #1
    My Boats:
    Formula 311 SR1 1987
    Join Date
    Aug 2005
    Panama Rep of Panama

    Angry TRS GEAR RATIO "Which would be the best ratio for 540 HP engine.)

    Hi I own a formula 311 1987 with Trs Drives and Borg W Transsmisions and i have upgraded my engines to 540 HP.s but only getting 69. MPH out of the boat with my previews 420 engines I was getting 57 MPH so I am starting to think they maybe something wrong with the gear ratio of my boat the 69 MPH speed was achived testing with 25 P Mirage blades at 4900 RPM,s and should go up to 52,00 any suggestions I feel something is not workiing correctly or substracting power from the end formula.

    Any suggestions

  2. #2
    Offshoreonly Advertiser Offshoreonly Advertiser bbladesprops's Avatar
    Join Date
    Jun 2003
    Princeton, Wisconsin


    A 12 mph gain for 240 HP is actually pretty good.

    Labbing the propellers could raise your rpms 200-300 and get you over the 70 mph hunp.
    Brett Anderson / BBLADES Professional Propellers

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