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Perfomance #'s__for a 1998 225 Johnson

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  • Perfomance #'s__for a 1998 225 Johnson

    I have a 1979 21 CC with a 1998 Johnson 225. According to the Nav man fuel flow I am burning about 12.5 Gal/hour at 3800 rpms'which is about 20mph. I dont really push it much past that. Old- bad- back ect.

    There is a Mako owner a the marina with a 1976 CC mako 2004 175 Johnson two stroke who says he is getting much better #'s. He has no real #'s to compare Just says he gets better #'s since he put this motor on then his old 225.

    Just curious is any one running a similar setup as the 2004 175 Johnson. Are the numbers that much better and does the boat perform as well.?

    Paul
    1979 21 CC Mako, 2006 E Tec 225 Hp [br]Connecticut

  • #2
    IMO

    1.6 miles per gallon really isn't bad for that year outboard. Plus, if your running at 3800rpm max than your not really hitting the "sweat" spot with is around 4200-4500rpm. Your also comparing a huge difference in power rating from a 175 to a 225. Is your motor carbed, chance are his is EFI which is suppose to be more efficent over carbed. What does he mean by way better? 2 miles to the gallon, 2.5, 3????

    another note is hull design, he may have simi-V which requires less power to push and you may have a deep-V which requires a little more power.
    Steven[br]1978 Powercat 232[br]One flat broke, the other almost ready to float!!![br]Atlanta, GA

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    • #3
      Thanks for the response

      My motor is Carbed. Knowing that someday in the near future I will have to repower I have been casually reading and comparing the different motors. I wonder if a 175 is sufficent to move my boat.

      I will try running this weekend at the 4200-4500 range and see what numbers I get.

      Thanks Paul
      1979 21 CC Mako, 2006 E Tec 225 Hp [br]Connecticut

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      • #4
        On your navman set the readout to read instant MPG. then adjust your speed in 200 rpm jumps from your 3800 on up. You might find your best MPG is at 44-45 hundred rpms like hungone mentioned.

        I have a 1979 21 center console like yours with a 1996 225 johnson and can get 2.0-2.2 at that rpm range. (I have trim tabs, no t-top yet) you might also need to calibrate your speed and flow on your navman unit. dave.
        [br]1994 Mako 215 Dual console Optimax 225[br]1978 Mako 19 with 90hp johnson[br]1996 Mako 22[br]1982 Mako 171 Angler 135 Black Max Mercury[br]1987 21b 225 Yamaha[br]1974 23 inboard Gusto gone.[br]1979m21 225johnson \"blue dolphin\" bought off this board and restored [br]with everyone\'s help!!Gone but not Forgotten....[br]1979 20 Mako 115 Suzuki gone[br]1977 19 Mako 115 Johnson gone[br]1976 23 Mako twin 140 Johnsons gone[br]1983 224 with closed transom and bracket[br]And 162 SOB (some other boats)[br]Venice Florida, Traverse city Mi.

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        • #5
          I HAVE ONLY RUN MY 86 228 W/87 225 RUDE 2 TRIPS WITH MY NEW NAVMAN AND HAVE NOT CALIBRATED IT BUT ON 2 50 GAL FILL-UPS IT WAS 2 GALLONS OVER ON WHAT I COULD ACTUALY GET IN THE TANK SO I AM GOING TO SAY IT IS 4% OFF. BETWEEN 3300-3600 IT GOT 12.5-13.3 GHP @19-22 KNTS BY GPS. SO THAT IS 1.66-1.72 KNOTS PER GAL. THE BOAT AND MY BACK LIKE 20-25 KNOTS. THE PROP IS A 15 1/2 X 17. FULL FUEL 2 PEOPLE NO TACKLE NO ICE IT WILL TURN 5500. 3 PEOPLE FISH READY 5000. I WOULD LIKE TO TAKE SOME PITCH OUT TO PICK UP THE RECOVERY RATE WHEN COMMING OFF A WAVE OFF SHORE. AT TIMES I NEED TO JOCKEY THE THROTTLE. I ALMOST NEVER JOY RIDE BUT I AM AFRAID TO CHANGE ANYTHING BECAUSE I CONSIDER THE FUEL MILEAGE GOOD RIGHT NOW.
          OVER BUDGET[br]PEARLAND TX

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          • #6
            ALL JOHNSTON 2 STROKES EXCEPT FOR A VERY FEW 1998'S ARE CARBERATED.
            OVER BUDGET[br]PEARLAND TX

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