New engine and new out drive with different gear ratio need prop help

[rockslut]

So old set up was high hour carbureted 5.0 and alpha 1 out drive with 1.62 gears. The new set up is new 350 mag mpi and a new alpha 1 with suggested 1.47 gears..
So i put the old prop on the new setup with is a 4 blade stainless 14.25'' and 17pitch
During a shake down run on Sunday my top speed was 33mph at about 3800rpm at WOT. New engine needs about 5000rpms at wot. Very sluggish to get up on plain. i figured i would be under proped but this is all i had.
This is a ocean boat and i carry a lot of gear (fuel,ice,lead ect) 2001 23' bayliner trophy.
Im not to concerned about mph, 30-35 is plenty. i do need more lower end control easy out of the hole and better control in big sea's.
Any suggestions would be great. im going to stop by a local boat shop on the way home tonight and pick there brains also

Thanks again, Mike

 

[alldodge]

Can you put the old ratio drive back on?
The 350 mpi has more HP but with that heavy of a boat, the prop would be the first to change before the drive.

Having a 17-4blade is equal to 19-3blade. Could try a 17-3b but would look for a 15-3b

 

[rockslut]

Thanks alldodge the outdrive had erosion problems thats the reason for buying a new one. and gear change was recommended by mercury when i bought it. barrowed a 16'' 11p stainless 3 blade to test today

 

[QBhoy]

Thanks alldodge the outdrive had erosion problems thats the reason for buying a new one. and gear change was recommended by mercury when i bought it. barrowed a 16'' 11p stainless 3 blade to test today

I’m not sure there is a prop of 11” pitch that would go on that alpha. Might be wrong.

 

[rockslut]

This is the one i got QBhoy. Testing it Saturday morning !!

 

[QBhoy]

This is the one i got QBhoy. Testing it Saturday morning !!

Ah. Faye play. Looks like an evertia eco. You’d imagine that would too small a pitch by a couple inches. The big blade diameter will help counter that, but I’d normally have money on that being too small a pitch and bouncing off the rpm limiter easily perhaps.
Were your trim tabs left down and drive trimmed way down on test run ?

 

[QBhoy]

Edited and deleted comment.

 

[rockslut]

Ok guys headed out this morning to test. Engine ran real nice and strong im supper happy with how it all came out. So WOT would run a little over the 5000rpm max, I didnt run it up but would have prob went to 5300-5400. I love the low end power and control, being a ocean boat and fishing in big sea it will be nice to have the bump when i need it. I dont thing im going to change anything. Top speed at 4800rpm was about 32mph and that is plenty. Keep in mind this was a empty boat today just the wife and I. normally carry 4 people , lots more gear and ice. Thanks for everyone's help !!

 

[alldodge]

Sounds like it should have no issue once loaded