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  1. #1
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    Only turning 5700 at WOT

    I have a 2018 Z21 with a 250 Pro XS two stroke. 12in atlas, 24p fury. Only able to to turn 5700 rpms at WOT, 63-64 mph with 2 guys 3/4 tank of gas, full live wells and full tourney load..normal or not? Thanks!

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    #2
    What elevation are you running at? Seems about right to me. I am at 2500 foot elevation and that is about what I run with a 24 pitch prop in a 2013 Z20 with a 250 pro xs. Most of the high speed numbers you see on here on with a light load and at very low elevation.
    2013 Nitro Z8
    2013 Mercury 250 Pro XS

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    #3
    around 1000 feet

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    #4
    add bobs 2 in spacers to ur jackplate and a 25 bravos 1 xs you will gain lift and speed and a set of trim extenders

  5. Member
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    #5
    I shouldn’t have to do that though right ? I would like to avoid add ons like that..maybe a prop if need be..

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    #6
    Quote Originally Posted by Stl142206 View Post
    I shouldn’t have to do that though right ? I would like to avoid add ons like that..maybe a prop if need be..
    You can gain speed like recommended above, but at what cost per mph? You are about one pitch from obtaining 6000 rpms so a 23 pitch may help or try a 4 blade, but props are expensive too. Or you can try to redistribute more weight to the rear of the boat for starters. If it was really hot, that saps your power too. If you had empty livewells, 1/2 a tank of gas, and first thing in the morning, you would probably be at 5900-6000 and be running about 66-67 mph. That in reality makes you arrive about 3 minutes behind the guy in front of you running 70 mph after an hour run. Just saying.

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    #7
    Quote Originally Posted by SteveS View Post
    You can gain speed like recommended above, but at what cost per mph? You are about one pitch from obtaining 6000 rpms so a 23 pitch may help or try a 4 blade, but props are expensive too. Or you can try to redistribute more weight to the rear of the boat for starters. If it was really hot, that saps your power too. If you had empty livewells, 1/2 a tank of gas, and first thing in the morning, you would probably be at 5900-6000 and be running about 66-67 mph. That in reality makes you arrive about 3 minutes behind the guy in front of you running 70 mph after an hour run. Just saying.
    Solid advice. If you don't mind getting another prop, a summer 23P and a winter 24P isn't a bad idea if you really want to eke out performance, just depends how bad you want the extra speed. Like mentioned above, weight distribution and getting rid of excess tackle likely would help more than anything.

    On my rig I just happened to have a spare 24P tempest from my last boat, it works a little better than my fury as my "loaded prop". Only about 69 MPH, but can reach it when fully loaded with livewells, tourney partner, full gas etc. My 24P fury was definitely faster when it was lighter loaded, but only 65 or so with a full tourney load.
    2020 Nitro Z20 Pro Package

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    #8
    Hot weather will kick those motors in the butt. Living in Oklahoma u have to prop down in the hot months to make them run. The 4 stroke isn't as bad but still runs much better in cool air.

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    #9
    thanks guys for the advice

  10. Member JoePA's Avatar
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    #10
    You are running a 2 stroke and 5800 RPM is your target number to shoot for not 6000. You are right at 9 slip with your prop and that isn't bad at all. I would try different props to find the one that works best. Tempest, Trophy, Bravo, Razor or a Scorpion.
    Joe Galada - Tamaqua, PA
    2004 Ranger 521VX - Yamaha 250 SHO

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    #11
    What pitch tempest would you try?

  12. Member JoePA's Avatar
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    #12
    Quote Originally Posted by Stl142206 View Post
    What pitch tempest would you try?
    I would say a 25 as they are the most common used on the 250 2 strokes. I have a 24 Scorpion you can try if you like, Just pay shipping. Its runs a little stiff but at least give you an idea of how it runs compared to your Fury.
    Joe Galada - Tamaqua, PA
    2004 Ranger 521VX - Yamaha 250 SHO

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    #13
    I have a buddy with a 25 tempest, I am going to give that a try.

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    #14
    Tried the 25p tempest and the top end was worse then my 24p fury. Does anyone have experience running a 23p fury on a z21 250hp 2 stroke?

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    #15
    Also, does anyone know if trim extenders void the engine warranty through the white river protection plan?

  16. Nitro Boats Moderator BMCD's Avatar
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    #16
    Sounds like your not getting bow lift, causing higher than expected slip #s, and potentially keeping your rpm's down a bit.

    Have you ever gotten better speeds or RPMs? with 2 people "of avg size", livewells full, and fuel. I would see 66-67 on my 2 stroke boats.

    After the Torquemaster 2 the 24p fury was the most common prop on that setup.

    And all props of similar pitch and design are not the same, try another fury 24. Have experienced this a few times.
    Bryan McDonough
    2023 Nitro Z21 XL
    Nitro Team

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    #17
    That's is what I thought. I would agree not enough bow lift.

  18. Member
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    #18
    Only able to turn 5700? 56-5800 is what you should be running on a 2 stroke and I can't see getting more than a couple additional mph with that load in a big heavy hull like that. I personally would play with the engine height a little, and MAYBE get the prop worked for some more bow lift, beyond that the money yould end up tossing around would not be worth the gains.

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    #19
    Thanks for your input.

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    #20
    When I had my '18 z20 with a 250 pro xs, I tried probably 10 different props, and always went back to a 24 tempest. It seemed to have the best lift, speed ride and rpm. Full tournament load would spin 5850 rpm @70mph, and running a normal load would run right 5950 @72. Hot or cold didn't seem to matter.
    2022 Skeeter ZXR20

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