You need more setback from what I've been told. I just started on my voyager and everyone I've talked to, says to run 12 inches of setback. Also, what bottom are we talking? V bottom or xt?

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im running 5500 rpm at 56. that was with a blown trim manifold im getting it fixed right now. i did buy a 26pitch 3 blade i want to try to see if i can get a few more mph

what rpms are you running at 56? i've hit 68 now without chopper. 55 is where mine gets on the pad and is ready to open up. single biggest improvement was wedges (they are cheap) that improved my trim. got to noticing i had a rooster tail until getting on the pad which basically lifts nose and changes trim angle. the wedges gave me more trim

Not trying to jack your thread but im working with the same setup as you right now and am seeing around 56 with 3 blade 24pitch if you do buy a merc i would be intrested in your chopper prop

I have a 5in manual jacking plate, and plan to try chopper again a little lower because it just cavitates. might get 200 merc in the spring. would perfer 225 but my rating is 200 and don't like insurance issues. buddy had a voyager with 200 merc and 28 chopper. no jacking plate, no lwp and he did 77. i think i can get 70 if i get set up right. what is better for top end- larger diameter or smaller?

Thats not necessarily true. If you can get the motor up a little more and if you have too, plug the top one or two intake holes on the lower. Can you move the motor up by changing holes on the clamp maybe? Then again, a Voyager is a lot of boat for a 175 so if your getting in the mid to upper 60's your not doing too bad. But getting the motor up as even with the pad as you can without losing water pressure will help a lot too unless you get a cone with a LWP.

factory. from what i've read, under 80 ish, nosecones don't help. i keep water pressure at max trim

Does the motor have a nose cone on the lower with low water pick ups or is it a factory lower?

ok, forget the 25 in shaft, i am a 20in. was mistaken.
center of shaft is about 3.5 below pad. playing with props. marginal 14x26 and it ran 56 @5500. new 14.5 x 25 four blade ran 62.2@4700. next prop available is 14 1/8 x 23 4blade will be trying soon. I'm wide open to suggestions and info.
should i be looking for larger or smaller diameters for best speed on this boat? and yes, I do understand the difference between pitch and diameter
found a 26 chopper but it only ran 62 constant cavation, couldn't fool it into grabbing. season ran out before i could lower it down some. i have hit 68 with a 24 3 blades at 5300

You could just change out the mid and get a 20" shaft for your lower or have the 20" cut. The boat will be 100x happier with a 20 inch motor. I dont know how much more you can really do until you can get that propshaft close to even with the pad. Of course you will need a cone with a low water pickup when you start getting up that high.

Maybe someone alse will have some tips for running a 25" motor but your best bet would be to find a 20" mid/motor.