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Old 03-25-2020, 08:30 PM
foil dude's Avatar
foil dude foil dude is offline
TT Regular
Join Date: Apr 2019
Boat: 1990 Prostar,1995Prostar, 2001 X9, 2019 NXT20
Location: Norcal
Posts: 36
NXT20 Prop upgrade OJ or ACME

Planning on going to a different prop.So looking for help & incite from all you out there. Use is 90% surfing, no slalom to so top speed isn't a big deal. I just want to have one that works best in the 10-24mph range.

I have the stock OJ805 and it has some run-out so it needs a tuneup. The boat has always had a low speed vibration that goes pretty much away when you are up to speed. Visually it looks perfect. Since this my first Vdrive new boat i kind of always shrugged it off, but that had always bugged me as my X9 was always smooth. So popped it off and put it on a shaft in the lathe and took an indicator too it. One blade has a wobble of about .1"in one area compared to the other blades, so I'm guessing that is it. There are no marks on it so don't know if it came that way or hit a stick and did it in. Can't remember hitting anything so life goes on.

I was looking at both Acme and OJ and just wondered if there are any suggestions on one brand vs the other. My X9 had an Acme so I'm open to what works the best.

I'm running close to 3500-4000lbs with ballast and passengers at about 900feet elevation
Wake Makers says Oj815 or AC2241 Acme says 2243 or 3155.

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Old 03-26-2020, 04:41 AM
g-mantrix's Avatar
g-mantrix g-mantrix is offline
TT Enthusiast
Join Date: Oct 2010
Boat: matrix sorrento 2006 315 mrcruiser
Location: south east
Posts: 345
I replaced my OJ815 to the Acme 2241
I prefer the ACMe over OJ
I fitted the 710ís into rear lockers
And with full ballast plus 6-eeps surfs great and gets onto plane for wakeboard speed easy

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Old 03-30-2020, 03:01 PM
foil dude's Avatar
foil dude foil dude is offline
TT Regular
Join Date: Apr 2019
Boat: 1990 Prostar,1995Prostar, 2001 X9, 2019 NXT20
Location: Norcal
Posts: 36
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Old 04-03-2020, 09:05 AM
SS LS1's Avatar
SS LS1 SS LS1 is offline
MC Devotee
Join Date: Jul 2006
Boat: '17 XT20, '13 X2 Gen2, '98 30th Anniv PS190
Location: Western MI
Posts: 1,099
Acme 3155 is what you want, It will greatly increase your hole shot, less prop slippage when heavily loaded, likely drop your surfing RPMs by 200 RPM, save some fuel and it will greatly improve the Zero Off speed control accuracy in rough waters and when heavily loaded down.

Only downside is cost and loss of 1-2 mph top speed possibly.
XT20 5500 GDI Black Mica/Black Topdeck/ Black interior
SOLD - 2013 X2 Pro Pkg, Gen2 Surf
SOLD - 1998 30th Anniversary ProStar 190
SOLD - 1985 Stars and Stripes

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Old 05-04-2020, 11:49 AM
Dbsinclair Dbsinclair is offline
TT Newbie
Join Date: Jul 2019
Boat: mastercraft XT22 2019
Location: Midwest
Posts: 6
I just went to an Acme 2243 from stock OJ 805 and am really impressed with the performance improvement. It is on an XT22, Ilmor 5000, factory ballast, 4 people, at 1000' elevation. The hole shot/overall power is great. It will plane fully ballasted. This is also my third inboard that I have switched to Acme.

Sounds like the 2243 may work for you, my suggestion is to email Acme support and tell them your set up. They give great advice. You can buy from anyone.
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