Home › Forums › Bass Cat Boats › Mercury 175hp Pro XS 4-stroke
Midnight Rider.
The specs I’m seeing for the Pro XS models DRY WEIGHT is 456lbs for the 150 and 470lbs for the 175. Add the weight of 6 quarts of oil and a prop. RPM for both engines is maximum of 6000.
Regardless, you will see approximately 4-5 mph increase on the top end with the 175.
I understand it’s without fluids, but it seems like Mercury is publishing figures without cowling which I’m not sure that Yamaha or Evinrude do as I don’t believe that’s industry standard. I just read the same source claims to have weighed a 150hp 4-stroke and it was 455 without the 22lb cowling, just trying to get an apples to apples comparison. They said it was without prop as that was initial thoughts too, I agree as I’m doing 66 solo now and hear 175s break 70. I’m not only interested in the top speed gain with an additional 25hp, but more so the 50lbft of torque as that’s a bigger gain for holeshot especially when loaded.
I’ve had a chance to get mine beyond the first stage of the break-in and hit 69 lightly loaded but with a ton of chine walking. Keep in mind this was the first time I’ve driven the boat at WOT so I expect to learn its behaviour better and get more from it soon. It’s going to be a fun boat, I can already tell you, and the 175 on the Sabre vs a 150 is like night and day. They’re 2 different completely different boats and my 150 would run 66 easy alone, 68 on a good cold day. This one will hit 68-69 in a hurry…if you hold it there. I trimmed off and didn’t push it too hard being my first time behind the wheel and all I took it easy.
I made 2 passes at WOT for maybe 4 minutes each time. It doesn’t like a lot of trim, reminds me of driving my partner’s P2 in all honesty but a bit more “wild” at this point, for lack of a better term. I don’t have a lot in the boat yet as far as a load but as soon as I get a break from work I’m going to load it like I normally would and get someone else in the boat with me and just learn to drive it from here. The prop, a 25 Fury 3-blade, seems like it will be good at least for one person. I’ll know more when I get it loaded and someone else in it.
ArkansasFisherman wrote: I’ve had a chance to get mine beyond the first stage of the break-in and hit 69 lightly loaded but with a ton of chine walking. Keep in mind this was the first time I’ve driven the boat at WOT so I expect to learn its behaviour better and get more from it soon. It’s going to be a fun boat, I can already tell you, and the 175 on the Sabre vs a 150 is like night and day. They’re 2 different completely different boats and my 150 would run 66 easy alone, 68 on a good cold day. This one will hit 68-69 in a hurry…if you hold it there. I trimmed off and didn’t push it too hard being my first time behind the wheel and all I took it easy.I made 2 passes at WOT for maybe 4 minutes each time. It doesn’t like a lot of trim, reminds me of driving my partner’s P2 in all honesty but a bit more “wild” at this point, for lack of a better term. I don’t have a lot in the boat yet as far as a load but as soon as I get a break from work I’m going to load it like I normally would and get someone else in the boat with me and just learn to drive it from here. The prop, a 25 Fury 3-blade, seems like it will be good at least for one person. I’ll know more when I get it loaded and someone else in it.
Just to clarify this is the new 3.4L V6 175hp Pro XS 4-stroke and you had a 150hp 2-stroke previously? Not sure if you tried filling the livewells or not as that will help lessen the chinewalk especially if it’s empty. What RPM were you turning with the 25 Fury at 69 and did you measure PTP? Thanks for sharing
I haven’t measured ptp yet, it’s set where it was when I picked it up…I assume it’s the same place it was from the factory. I knew you were talking about the torque of the 4-stroke but I’m just saying the 175 vs 150, even in the 2 strokes, was a major change.
RPM around 69 was about 5600-5700 on the gauge…just over 5500…which doesn’t seem exactly right as that would indicate only about 4% slip. The gauge may be off a bit, it’s an analog gauge and has no monitor on it.
ArkansasFisherman wrote: I haven’t measured ptp yet, it’s set where it was when I picked it up…I assume it’s the same place it was from the factory. I knew you were talking about the torque of the 4-stroke but I’m just saying the 175 vs 150, even in the 2 strokes, was a major change.RPM around 69 was about 5600-5700 on the gauge…just over 5500…which doesn’t seem exactly right as that would indicate only about 4% slip. The gauge may be off a bit, it’s an analog gauge and has no monitor on it.
I’m at 5% on my 24 Fury 3 when set flush where it came from the factory, so I’d say your numbers are believable. You also went from a regular Sabre to an FTD correct?
Yes I did. There’s a bit of weight difference there too I think.
The inaccuracy of the analog gauge is the rest of the slip, BCB uses 8% to calculate performance and that has come to align with GPS readings. You will see they have used 8% a long time in the archived data here.
Bass Cat Boats wrote: The inaccuracy of the analog gauge is the rest of the slip, BCB uses 8% to calculate performance and that has come to align with GPS readings. You will see they have used 8% a long time in the archived data here.
Doesn’t prop design and engine height as well as trim angle all play a factor in slip percentage? I understand the analog isn’t the most precise and maybe off 50rpm, but I’d say every off the shelf pitch isn’t exact either. Have y’all ever weighed a Mercury outboard in house to verify their published weights?
I’d be curious about tolerances in the prop pitches as well. I know on golf clubs most manufacturer has a 0.75° tolerance…or they did 10 years ago. A 9.5° driver could be as low as 8.75° and as high as 10.25°. Face angle was a bit looser of a tolerance and could vary by as much as 2° either direction. Face angle also changed the loft angle…open increased loft and closed lowered it.
I’d be surprised if the tolerance was less than +/- 0.5….meaning a 25 pitch could be 24.5-25.5 pitch but this is not my area of expertise and it may be tighter than this, or not as tight.
ArkansasFisherman wrote: I’d be curious about tolerances in the prop pitches as well. I know on golf clubs most manufacturer has a 0.75° tolerance…or they did 10 years ago. A 9.5° driver could be as low as 8.75° and as high as 10.25°. Face angle was a bit looser of a tolerance and could vary by as much as 2° either direction. Face angle also changed the loft angle…open increased loft and closed lowered it.I’d be surprised if the tolerance was less than +/- 0.5….meaning a 25 pitch could be 24.5-25.5 pitch but this is not my area of expertise and it may be tighter than this, or not as tight.
That’s a good question, though not looking to get off on too much of a tangent. I know there’s a 10% +/- rule on the power rating of outboards, but the question I’m interested in in this thread is how accurate are the published weights? Excluding fluids and prop are a given as the thing can’t run without them, but suppose you can techno run without a cowl though I doubt the manufacturer recommends it. A third party who’s weighed the new 4-strokes seem to be heavier than advertised, so I’m wondering if maybe that’s the new industry standard?
Regardless of all the weight, I believe you would be satisfied bumping up to the 175 ProXs 4s.
If its equal, or better than the 2 stroke, its worth doing.
It carries a load better than the 150. You will see a big difference in acceleration, and of course a bump in top end speed.
I like a 4-stroke over a 2-stroke, just wish they didn’t have to get bigger and heavier as I like my outboards like I like my woman…slim
Not saying a bigger motor can’t still make ya happy though, just not what I prefer and like an honest woman too;)
If my 150 is really 477lbs as the article below claims then it’s probably closer to only a 20lb difference, since the V8 cowl is 30lbs and the V6 cowl is slightly smaller.
https://www.wavetowave.com/home/2018/10 … ercury-150
Post 15…
http://www.bbcboards.net/showthread.php?t=925606
ArkansasFisherman wrote: I’d be curious about tolerances in the prop pitches as well. I know on golf clubs most manufacturer has a 0.75° tolerance…or they did 10 years ago. A 9.5° driver could be as low as 8.75° and as high as 10.25°. Face angle was a bit looser of a tolerance and could vary by as much as 2° either direction. Face angle also changed the loft angle…open increased loft and closed lowered it.I’d be surprised if the tolerance was less than +/- 0.5….meaning a 25 pitch could be 24.5-25.5 pitch but this is not my area of expertise and it may be tighter than this, or not as tight.
It’s not so much the variance as it is whether each BLADE has the same pitch/rake/cup, etc. For example, I had a brand new SHO 24″ blueprinted and balanced. Initial measurements were all over the place, with each blade being different from the next one by as much as .75″. You can take 100 props out of the box and there might be 10 that are right on spec, the rest are not. It shouldn’t be that way…when you buy a 500+ dollar prop, it should at least be very, very close. But, that is not the case for most and the only solution is to have it worked by a reputable prop guy. Ronnie Gilbert has my 24″ Tempest Plus right now, repairing a couple of dings and B&B’ing it. I talked to him Monday and he said the prop was all over the place in pitch, rake, cup, etc. I will likely have him do my 25″ Bravo 1 FS as well so that I’ll have two perfect props, one for flat out speed and one for summer/rough water, and heavy loads.
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