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2019 Z18 W/150 Proxs Four Stroke, Top Speed?

Thread in 'Nitro & Tracker Owners' started by Thomas Sylvester, Mar 4, 2019.

  1. Thomas Sylvester

    Thomas Sylvester New Member

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    Hey Guys,

    New to Nitroowners. I just bought a 2019 Z18 with a 150 Pro XS four-stroke. This engine came standard with a Fury 23P 3 blade prop with all 3 PVS holes fully plugged. I also have a mechanical 6” slide master jack plate. Running approx 2-1/2” below pad. Boat runs very smooth, pops up on plane. however, here’s the problem...

    Running some tests during initial break in period (so not running WOT for more very long), it appears to getting around 5800 RPM, but maxing out top speed around 54 MPH. Seeing what others are getting out of there 150’s and Z18’s seems like I should be getting closer to 65 MPH?

    Load has been approx 1/2 tank of gas, loaded with tackle and just myself and a passenger.

    Do you think my prop pitch should be 24P instead of 23P, engine height adjusted? Jumping on plane, Cavitation and/or slip don’t seem to be any problems. I get some porpoising when coming down to low speed planing around 3500 rpm, but nothing adjusting trim didn’t smooth out as normal.

    Thoughts? Thank you ahead if time!
     
  2. Kerz

    Kerz Well-Known Member

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  3. Larry Williams

    Larry Williams Well-Known Member

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    I have a 2017 Z-18 with the same engine. I have GPS'd 60 MPH a time or two but never 65. I have the Atlas Hydraulic Jack. I would question being able to run 65 but I haven't had any interest in running more than 60mph.... I will say that you should eaisly reach the upper 50's. Be sure you are checking with GPS. The mechanical gauges are all highly inacurate at best.
     
  4. Thomas Sylvester

    Thomas Sylvester New Member

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    Thanks Larry, what prop are you running?
     
  5. Larry Williams

    Larry Williams Well-Known Member

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    Thomas, I'm using the standard 23" pitch, 3 blade, that comes on the 150 rigged Z18's. I'm also a fan of the Sport SE 300 hydrofoil device. I find a huge advantage being able to easily get on plane with no more than 3,500 rmp throttle with any load. It has a small footprint and is out of the water once on plane and helps hold the plane attitue at slower speeds. I ran one for years on another 20' glass boat. Some say the don't like the appearance of it. I put it on my new rig without hesitation- too much advantage for me not to continue using one. Those who queston the use of it just haven't tried it or they used the wrong one.
     
  6. BassinBrian

    BassinBrian Member

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    I'd like to see a 150 doing 65gps. I just sold a TR20 with a 225 optimax 2 stroke that gps'd 72 at best. I now have a Nitro Z21 with the 250 Optimax, 1/4 tank with very little equipment 74gps. Full tank, 2 people (partner weighs 320) tournament load, 2 power poles I'm lucky to get 68mph on gps. now neither boat has been set up or propped out. But in my years I've seen very few 150's exceed 60mph. Not doubting its possible but once you start lifting motors and propping beyond recommended manufactures specs you can run into trouble. Handling can be an issue, you can also have your prop blowing out as they say and over rev your engine. Just my opinion.
     
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  7. Chris Walker

    Chris Walker Active Member

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    I have found so much inconsistency with this boats speed. I have the same boat with no jack plate in the same motor. With the two power poles a full tank of gas and a full live well my top speed is 50 miles an hour. Mine came with a 22 p three blade and would not get on plane after installation of the power poles. The dealer had to put a 19 pitch prop on mine just to get on plane.
     
  8. Chris Walker

    Chris Walker Active Member

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    Do you have power poles on your boat? I’ve never had over 50 miles an hour with the same rig.
     
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