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nautique
03-09-2011, 04:13 PM
HI,
I need a new Prop.

I have a X1 MasterCraft 2003 with oj 14x18 , I have good top end speed,
fully loaded balasst with extra++, I have no acceleration from below.

And I have a oj 14.25x14 xmp, balasst fully loaded with extra++, I have very great acceleration from the bottom but no top speed. I would like a propeller with whom I have great acceleration from the bottom and speed for barefoot .
for barefoot without / and wakeboard with full ballast+.
because my 14.25x14 ist broken !
Eric (from OJ) the 14.75x15.5 said would be good.
has anybody experience.
thanks
Sincerely:)

sand2snow22
03-09-2011, 04:26 PM
He recommended the same one for me.......I have noticed the same problems you described. I have one X2 with the 13.5X17 and the other with the 14.25X14. I'm going to swap out the 14.25X14 with the 14.75X15.5. I have the MCX in both, with the 13.5X17 loaded down, I just give her a little more gas and she is good

nautique
03-09-2011, 04:56 PM
Thank you
I have the MCX too.
have i understood correctly,
you want change the 14.25x14 to the 14.75x15.5.

do you have on it now, the 15.5.








0.

0.

sand2snow22
03-09-2011, 05:05 PM
Yes, that is the one I want to change. 14.25X14 Spins high RPM's. No I don't have it on, yet....

nautique
03-09-2011, 05:13 PM
When you want to change it,tell me your experience, then
thanks:)

mccobmd
03-09-2011, 06:15 PM
I looked into this for my X1 and found just what Sand said. I have the OEM prop and it is a good mix of power and top end. I am rarely loaded heavy and if I am I just give more throttle than I do empty. I figure the OEM prop is designed to be a good mix of speed and pull and it has been for me. If I was loaded most of the time I woud change but we ski at 32mph as much as we surf at 10 so I'm staying put.

brucemac
03-09-2011, 07:11 PM
i have the 14.75 x 15.5 xmp edge on my 03 X-2 with MCX. i like it, with one exception, i porpoise pretty bad without weight up front above 35 or 36'ish.

i almost sent it back to try a different one out, but ultimately deicded to keep it. eric was more than willing to work with me, i just decided to stick with it.

i spin pretty close to or at the limiter depending on conditions unweighted. the only other thing i noticed is a slight harmonic whine at around 900-1000 rpm, but can make it stop with a slight throttle adjustment up or down.

hole shot is killer.

sand2snow22
03-09-2011, 07:37 PM
Bruce, where are the people sitting and what tanks are full when you porpoise? I can porpoise at 25 MPH if I have too much weight in the back.....

nautique
03-10-2011, 07:25 AM
Bruce, you think the 15.5 is also good for a fully filled X1 with too 750 lbs fatsac in rear + KGB in front+ too sidesac in front.
you have written "hole shot is killer " is it really so?
thanks

Ole Miss Rebels
03-10-2011, 12:38 PM
i have the 14.75 x 15.5 on my 2008 xstar with 8.1L. it is a little underpropped but wow do i have good response, speed lock, and braking power and control when i need to do some tight maneuvering. i could probably save a little fuel with the 14.75 X 17.5 but i love the response of the 15.5. top end means nothing to me as i never go over 30 mph and then only to scurry back to the ramp to avoid an approaching thunderstorm.

willyt
03-10-2011, 01:42 PM
anyone compared the 14.75x15.5 with a 14.25x14.5 on an X2 MCX? i have the 14.25x14.5 and love it, but i'm running about 3,600-3,800 rpms when loaded (2500 lbs + 5-7 ppl) at 22.8-23mph. Considering the larger diameter and 1 inch greater pitch, i would expect it to sacrifice some holeshot for lower RPMs at wakeboard speed. My holeshot with the 14.25 prop is almost too good.. since i've put it on havent been to WOT on holeshot... would rip my riders arms off.

considering i might be under-propped, would the 14.75x15.5 be worth investigating?

jason@wakemakers.com
03-17-2011, 08:08 PM
You're on the fringe between the two in terms of your ballast. Some people with that setup will want the 14.25x14.5 (OJ 477 Propeller (http://www.wakeprops.com/oj-477-propeller.html)), some will find that a little too aggressive and prefer the 14.75x15.5" (OJ 522 Propeller (http://www.wakeprops.com/oj-522-propeller.html)). What altitude you typically boat at will also impact which prop makes the most sense, so in Cincinnati it's not surprising you don't need the extra pop of the 477.

You'll probably lose around 300RPM with the 522, so you'll have to decide if that's enough of a difference to justify the change. Do you already have a spare? If so it might not make sense, but if you don't then you could use your 477 as your backup.

TOO-TALL
03-17-2011, 09:40 PM
What kind of fuel mileage did you guys see from these props??over stock. Better or worse?

I'm not worried about top speed.I'd like a better holeshot when fully loaded and better fuel mileage.......maybe I'm asking to much.

jason@wakemakers.com
03-17-2011, 09:43 PM
You'll experience a small but noticeable increase in fuel economy when switching to a lower pitched prop if you're running additional ballast. The reason is that you're reducing the load on the engine, which means it doesn't have to do as much work to accelerate the boat. Think of downshifting in your car or truck, if you try to go up a hill in too high of a gear you have to floor it to maintain speed, but as soon as you down shift the engine isn't working as hard.

Like I said above though, the difference is small, so the payback on a new prop is going to take a pretty long time. Of course you also get all of the other benefits of an upgrade (better hole shot, better speed holding, etc.).

jason@wakemakers.com
03-18-2011, 02:23 PM
i have the 14.75 x 15.5 xmp edge on my 03 X-2 with MCX. i like it, with one exception, i porpoise pretty bad without weight up front above 35 or 36'ish.

That doesn't really have anything to do with the prop, it's just an issue with that hull, since it started life as a direct drive, and now we have the engine and rear ballast shifted back.

It will be much better this season with your upgrade! :)

brucemac
03-18-2011, 02:41 PM
yeah i suppose; however, it was nowhere close to as bad with the old 14x18 (or whatever it was) stock prop. no expert by any means, but my hunch is the rpms. i was only turning like 4200 or so at WOT which is somewhat low for the MCX imo. something like 48 or 49mph with a light load. never had any issues with porpoising, but i would typically take it to WOT and then back it off slightly, so maybe physical speed came into play and i never settled into that 33-36mph speed range with the old prop. then of course if i'm not going that fast, i'm either unning at 21 or 10-11.

swatguy
03-18-2011, 03:50 PM
I am very happy with the Acme 1235 on my ride. Its a 14.5 X 14.25. Top end didn't suffer a ton.
I couldn't tell you how t compares to the Oj's performance wise as I have not had them side by side on my boat.

sand2snow22
03-18-2011, 04:09 PM
yeah i suppose; however, it was nowhere close to as bad with the old 14x18 (or whatever it was) stock prop. no expert by any means, but my hunch is the rpms. i was only turning like 4200 or so at WOT which is somewhat low for the MCX imo. something like 48 or 49mph with a light load. never had any issues with porpoising, but i would typically take it to WOT and then back it off slightly, so maybe physical speed came into play and i never settled into that 33-36mph speed range with the old prop. then of course if i'm not going that fast, i'm either unning at 21 or 10-11.

Not buying it. 48-49 MPH at 4200 RPM's? You mean 5200? I can come close to those speeds at 5200 RPM's...

brucemac
03-18-2011, 05:41 PM
i stand corrected. i went back and looked at my original correspondance to eric and i was turning 4600-4700 rpm's with an OJ 14x20 Force 4-blade. i even posted on here about it when i first got the boat because i thought it seemed pretty odd. granted this was before i had stargazer, so it was just the stock speedos. they could have been off easily, but i can say with almost 100% certainty that i did lose about 4-5MPH on top end. my point was more to the fact that porpoising was definitely increased with the prop change.

G-Star
03-18-2011, 05:43 PM
I am very happy with the Acme 1235 on my ride. Its a 14.5 X 14.25. Top end didn't suffer a ton.
I couldn't tell you how t compares to the Oj's performance wise as I have not had them side by side on my boat.

How is it out of the hole with the ballast loaded for wakeboarding? How about surfing?

I'm thinking I might need to re-prop after I install my the 750s and my IBS this spring. PO put a stainless steel something-or-other on, and I'm not too sure how it's going to do with the extra weight.

I'm guessing there's a noticeable difference in power/torque from the LTR to the MCX? I don't want to be working her too hard for surfing...

swatguy
03-19-2011, 10:01 AM
I run the 750's in the rear, center ballast, and about 600lbs in the bow. Out of the hole......... no problem at all. Same for surfing. My surfing speed sometimes is hard to dial, but that is more of a lake depth problem I think, as I surf in some spots that are only 7 ft deep.

Again can't compare it directly to the newer Oj's, but I can compare it to my old OJ 13 X17 Oj that I replaced with the 1235........ It's a huge difference.

jason@wakemakers.com
03-24-2011, 01:37 PM
ACME's 1235 will be very comparable to an OJ 475 (http://www.wakeprops.com/oj-475-propeller.html)/477 (http://www.wakeprops.com/oj-477-propeller.html) (same prop, one is spline for 2003 and newer, the other is 1.125" bore for 2002 and older), but OJ has worked very closely with Mastercraft to develop these props, so most of our customers elect to use their product.