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#12815999 - 07/04/18 09:56 AM 2018 520c Ranger/250 Pro XS setup
elkhunter7x6 Online   content
Extreme Angler

Registered: 01/20/07
Posts: 1026
Loc: panola county
What are yall running on the prop to pad measurement, RPMs with 3 blade 25 pitch Fury, how many and what size plugs,top end speed? I took delivery on my new boat at the end of May. It came with a 3 blade 25 Pitch Fury prop and the prop to pad measurement was 4 1/2". On the maiden voyage the boat was terribly slow out of the hole(no plugs in prop and three people in boat) and seemed either under powered or too much prop. The boat would not get on plane with 3 people and the live wells full. I raised the motor up 1/2" with no noticeable improvement. I also added 1 large plug in the prop but that made it worse so I took the plug out.I took the boat back to the dealership the next day. They could not find anything wrong and after several hours decided the motor cover might be restricting air flow. They removed the cover and test drove the boat and it ran much better. I picked the boat up and have been running it for a month now. The boat is running decent now but I feel something may still not be quite right. I can only turn 5300rpms at wot. With a full tank of fuel and just me in the boat I get on pad in 3 seconds, the top end speed is 70.8 @ 5300rpms with 3/4 trim. At 3/4 trim I am not kicking up a rooster tail at all. If I trim any higher the boat chine walks severely! With two people and the live wells full it takes 10 seconds to get on plane, top end speed is 69 @ 5300 rpms @ 3/4 trim.

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#12816055 - 07/04/18 10:49 AM Re: 2018 520c Ranger/250 Pro XS setup [Re: elkhunter7x6]
Capt. Bryan Offline
Outdoorsman

Registered: 01/14/07
Posts: 89
Loc: Southeast Texas
Sounds like you may need a 23 or 24 pitch prop with as hot as it is outside. 5300 rpms sounds a little low, 25 pitch may be ok once temps cool off.
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#12816088 - 07/04/18 11:20 AM Re: 2018 520c Ranger/250 Pro XS setup [Re: elkhunter7x6]
361V Offline
TFF Celebrity

Registered: 11/21/08
Posts: 5219
Loc: somervell county
Your speed actually sounds in the ballpark. Hey it’s a Ranger(I can say that). Your RPM’s do not sound enough so as mentioned above probably a 23p or 24p would rev faster and run the RPM’s up to actually give you a little more speed. My 521, while not a top fuel dragster will rev and and come out of the hole decent even in the hot summer. I run a 25p Fury completely unplugged. Most people with heavier full sized boats with a 2 stroke Merc 250 run those props with no plugs in.
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#12817070 - 07/05/18 09:45 AM Re: 2018 520c Ranger/250 Pro XS setup [Re: elkhunter7x6]
Ken A. Offline
TFF Guru

Registered: 10/02/06
Posts: 10251
Loc: Trophy Club, TX
Agreed. Too much pitch for the hot summer weather. Go to a 23 or 24. Leave all the plugs out of the prop to start. Your motor should turn right at 6000 rpms at top end even with full tourney load. This helps the prop ventilate (slip) because two strokes do not make much torque below 3500 rpms. The new V8 four stroke will fix that.

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#12817092 - 07/05/18 10:08 AM Re: 2018 520c Ranger/250 Pro XS setup [Re: elkhunter7x6]
Big Worm78 Offline
Angler

Registered: 11/05/13
Posts: 487
Loc: Deck of my boat
May have to add more pvs holes in the fury. Mine has the factory 3 holes plus added 3 more from Steves custom props. Mine was bogging bad due to not enough ventilation under a heavy load..it was not blowing out. The extra pvs holes really helped with the weight in the summer heat. But a smaller pitch in the summer would definitely help also with the lower rpms on top.
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#12817105 - 07/05/18 10:33 AM Re: 2018 520c Ranger/250 Pro XS setup [Re: elkhunter7x6]
jcwebb70 Offline
Angler

Registered: 02/20/06
Posts: 380
Loc: Allen, TX
Have the same set up but a 2016, new to me last November, came with a Fury 3 26 (all open holes), didn't notice the dog out of the hole so much November to April, but when May rolled around and people started going out with me, I noticed the terrible hole shot. Switched to a Fury 4 24, memorial day weekend, huge difference. I won't get the full top end that the 26 will, but hole shot, acceleration, and handling are much better and more useful to me. Had it up to 72 one time to say I did it, but that was enough.:)

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#12817118 - 07/05/18 10:39 AM Re: 2018 520c Ranger/250 Pro XS setup [Re: Big Worm78]
Ken A. Offline
TFF Guru

Registered: 10/02/06
Posts: 10251
Loc: Trophy Club, TX
Originally Posted By: Big Worm78
May have to add more pvs holes in the fury. Mine has the factory 3 holes plus added 3 more from Steves custom props. Mine was bogging bad due to not enough ventilation under a heavy load..it was not blowing out. The extra pvs holes really helped with the weight in the summer heat. But a smaller pitch in the summer would definitely help also with the lower rpms on top.


Going to a 23 will most likely solve his issue. As far as his boat chine walking, that is not a Ranger trait. Raising his motor may also minimize this while helping his holeshot. Chine walk is caused by several things. A lot of bow lift is one of them. He mentioned if he went past 3/4 trim it started chine walking.

Raising the motor will reduce the amount of leverage the prop gets that allows it to lift the hull free of the water. It also reduces the drag of the lower unit as it goes through the water. There is a sweet spot for all rigs at different loads. Obviously it takes more leverage to lift a boat that has 600# of tackle in it and a 300# partner with the livewells full and 50 gals of gas. So the prop will need to be deeper in the water to lift the hull free of the water to run.

Same boat with one person, no water in livewells, 1/4 tank of gas will not need nearly as much prop in the water to lift the hull free. Additionally, summer heat & humidity robs as much as 15% of your motor's HP so that's why it is normal to need a lower pitch prop in the summer versus the cooler months. So a motor that makes 250 HP in October may only make 215 in July.

Most folks think that sticking the motor deeper in the water helps holeshot. It is actually just the opposite. If you have a hydraulic plate you can experiment with this.

Two strokes outboards need the rpms to rev up to get into their powerband. Mercury recognizes this. Thus the holes and PVS system for their props.

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#12817124 - 07/05/18 10:41 AM Re: 2018 520c Ranger/250 Pro XS setup [Re: jcwebb70]
Ken A. Offline
TFF Guru

Registered: 10/02/06
Posts: 10251
Loc: Trophy Club, TX
Originally Posted By: jcwebb70
Have the same set up but a 2016, new to me last November, came with a Fury 3 26 (all open holes), didn't notice the dog out of the hole so much November to April, but when May rolled around and people started going out with me, I noticed the terrible hole shot. Switched to a Fury 4 24, memorial day weekend, huge difference. I won't get the full top end that the 26 will, but hole shot, acceleration, and handling are much better and more useful to me. Had it up to 72 one time to say I did it, but that was enough.:)


Yessir. My boat ran 74 empty with just me in it. Loaded it down and it ran 68. Happens to all of them.

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#12817154 - 07/05/18 11:00 AM Re: 2018 520c Ranger/250 Pro XS setup [Re: elkhunter7x6]
ssmith Offline
TFF Team Angler

Registered: 11/22/07
Posts: 3530
Loc: scotland tx
hot weather an summerblend gas is not good for building power on 2 stroke motors wait til it cools down it will be much better during the meantime only a smaller pitch prop will get you out of the hole better.

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#12817420 - 07/05/18 04:05 PM Re: 2018 520c Ranger/250 Pro XS setup [Re: elkhunter7x6]
elkhunter7x6 Online   content
Extreme Angler

Registered: 01/20/07
Posts: 1026
Loc: panola county
I appreciate all the info and suggestions. Every 520c and 521c Cup Series boat comes from the Ranger factory with a 3 blade 25 fury already installed. I guess either Ranger is selling these packages with too big of a prop or my 250 Pro XS is not making the normal HP for some unknown reason. With just me in the boat and a life jacket (no rods or tackle), 5300 RPM's on a 72 deg morning is all I can get at WOT. Hopefully some of the guys on here with the same setup can confirm the RPM's they are getting with the 25 Fury 3 blade. I don't mind putting a smaller pitch prop on the boat to get the RPM's up to 6000 but first I would like to rule out that I don't have something else going on.

The severe chine walk doesn't seem right to me either. I know Rangers don't have a reputation for chine walking. I could not make the 2004 Ranger that I just sold chine walk at all. I measured my prop to pad height yesterday and it was 4 1/2". I took the boat to the lake and started raising the motor in 1/4" increments. The prop to pad measurement is currently at 3". The water pressure is still the same, the hole shot is similar but I can tell the motor is building RPM's faster. The lake was rough so I was not able to open it up all the way and see if the RPM's increased and hopefully the chine decreased.

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#12817464 - 07/05/18 04:39 PM Re: 2018 520c Ranger/250 Pro XS setup [Re: elkhunter7x6]
Insurance man Offline
Pro Angler

Registered: 03/12/14
Posts: 973
Loc: Texas
Might want to get a compression check on the Merc

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#12817489 - 07/05/18 05:12 PM Re: 2018 520c Ranger/250 Pro XS setup [Re: Insurance man]
elkhunter7x6 Online   content
Extreme Angler

Registered: 01/20/07
Posts: 1026
Loc: panola county
Originally Posted By: Insurance man
Might want to get a compression check on the Merc

The dealership checked the compression on Day two after I finished break in and it was fine.

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#12817871 - 07/05/18 10:47 PM Re: 2018 520c Ranger/250 Pro XS setup [Re: elkhunter7x6]
Bryan O' Offline
Outdoorsman

Registered: 09/26/12
Posts: 227
Loc: Cypress Texas
I run the exact same boat, just a little older, and have several friends that also have 520/XS combos, and I've never heard of anyone turning a 23 pitch prop on this rig. Maybe a 24. I think I'd have the motor looked at before I started spending money on a bunch of props. That being said, they will turn a bigger wheel in the winter with colder air and water. With the 25 Fury it will run 69 - 70 now - full live wells and 3/4 gas - one person. In the winter 72 with the same load. It's turning 5750 to 5825 RPM. You should be seeing the same. I also don't think the Fury's need any of the pugs in. Over all from what I've seen and heard, the 25 Fury 3 blade is the best overall prop for this boat, if it's set-up correctly, and the motor is OK. My boat also responds to adjustments of the jackplate as well. It's a 10" Atlas and it has the best top-end at 3 on the plate. And yes, a Ranger can chine walk. Moving up the jackplate definitely helps. You do have to drive my boat to get the top out of it.
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Bryan O'
Total Recreation Products Inc.
Commercial Park and Playground Products and Services
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Ranger Z520 250ProXS

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#12818061 - 07/06/18 08:24 AM Re: 2018 520c Ranger/250 Pro XS setup [Re: elkhunter7x6]
furim2 Offline
Angler

Registered: 04/16/08
Posts: 485
Loc: Pilot Point, TX
It sounds to me like you aren't that far off what everyone else is telling you. What were you expecting? One thing you have to understand is the 2018 Pro XS 250 is dumbed down from the older models. Put a 2014 engine on it and see what it does. Mercury two strokes are a thing of the past.

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#12818083 - 07/06/18 08:37 AM Re: 2018 520c Ranger/250 Pro XS setup [Re: Bryan O']
elkhunter7x6 Online   content
Extreme Angler

Registered: 01/20/07
Posts: 1026
Loc: panola county
Originally Posted By: Bryan O'
I run the exact same boat, just a little older, and have several friends that also have 520/XS combos, and I've never heard of anyone turning a 23 pitch prop on this rig. Maybe a 24. I think I'd have the motor looked at before I started spending money on a bunch of props. That being said, they will turn a bigger wheel in the winter with colder air and water. With the 25 Fury it will run 69 - 70 now - full live wells and 3/4 gas - one person. In the winter 72 with the same load. It's turning 5750 to 5825 RPM. You should be seeing the same. I also don't think the Fury's need any of the pugs in. Over all from what I've seen and heard, the 25 Fury 3 blade is the best overall prop for this boat, if it's set-up correctly, and the motor is OK. My boat also responds to adjustments of the jackplate as well. It's a 10" Atlas and it has the best top-end at 3 on the plate. And yes, a Ranger can chine walk. Moving up the jackplate definitely helps. You do have to drive my boat to get the top out of it.


Thanks for the info!

It was pretty calm out yesterday evening so I took the boat out and ran it and adjusted some more on the jack plate. With the motor raised up I am now seeing similar numbers to yours. The motor gets in the power band faster and the hole shot is much improved, especially with the live wells full and all of my gear in the boat. With me, all of my gear and 1/2tank of gas I can get 72-73mph and 5700 RPM's at about 5/8 trim and no chine walk. I can increase the trim and briefly get to 74MPH and 5850 RPM and still climbing but the chine walk gets too severe for me to be able to safely handle at this point. I started moving some gear around trying to balance the boat but ran out of daylight. I am ready to call it quits on the tuning now and get back to catching fish.

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