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  1. #1
    Join Date
    Feb 2003
    Location
    Chicago
    Posts
    12

    Default Speedo Calibration

    I have a 2001 Outback with the stock 310 HP motor. I put an OJ 13X13 4-blade prop on in place of the stock 3-blade. I've been told by other boat owners that you calibrate the speedos by cruising with the motor at 3000 rpm. This speed should be 30 mph and to adjust the speedos accordingly. Is this true? Thanks.
    Pman

  2. #2
    Join Date
    Jan 2003
    Location
    Nashville
    Posts
    57

    Default

    Let me know how you like that prop. Thinking about going to a 4-blade.

  3. #3
    Join Date
    Aug 2002
    Location
    Maryville, Tn.
    Posts
    382

    Default Prop vs. Speed

    Pman, I feel you will be happy w/your new 4bl. You should notice a quicker hole shot, which the skiers and footers will enjoy, and be able to hold your speeds much better. For the boarder, it is nice because it lifts the aft end up and forces the bow down at lower speeds to get more boat in the water for a bigger wake, and not have a bow high take-off, even when loaded. Todays high h.p. and torquey motors engineered by Indmar, have changed the rule of thumb a bit on the 4bl. Set your speedo at 36mph@3800r.p.m., this will get you darn close to the high $ G.P.S. Brian Raymond

  4. #4
    Join Date
    Aug 2002
    Location
    Maryville, Tn.
    Posts
    382

    Default Prop vs. Speed

    Pman, I feel you will be happy w/your new 4bl. You should notice a quicker hole shot, which the skiers and footers will enjoy, and be able to hold your speeds much better. For the boarder, it is nice because it lifts the aft end up and forces the bow down at lower speeds to get more boat in the water for a bigger wake, and not have a bow high take-off, even when loaded. Todays high h.p. and torquey motors engineered by Indmar, have changed the rule of thumb a bit on the 4bl. Set your speedo at 36mph@3800r.p.m., this will get you darn close to the high $ G.P.S. Brian Raymond

  5. #5
    Join Date
    Feb 2003
    Location
    Chicago
    Posts
    12

    Default 4 blade prop

    Brian, thanks for the speedo calibration. And yes, the 4 blade makes a difference out of the hole and maintaining speed. The first season I owned the boat it was with a 3 blade. I purchased an OJ force 4 blade mid-next season and definitely saw a difference. At the time, stainless 4 blades weren't out (by OJ), but would like to try one someday.
    Pman

  6. #6
    Join Date
    Mar 2003
    Location
    Mississippi
    Posts
    67

    Default

    If you can borrow a GPS from someone this is a very easy and very accurate way to calibrate your speedo. You can also check it at any speed.

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