Dealer just picked it up today, hoping to know something first of next week, being the holiday, might take a minute. It will need a new Vee drive, after that, not sure.
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I couldn't spin a 14.5 x 14.25 with full ballast when I got my 2017 SA 450. I went throu 4 lol rops to try and figure it out. Brought it into the dealer and they diagnosed the fuel pump at load wasn't getting to pressure. Just an idea.
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Got my 3591 on this weekend.
Marginal improvement over the 16x15. I was hoping for more, it's better but nothing spectacular after one days use.
That being said I then promptly hit a rock (staying at my aunt and uncles lakehouse with a shallow dock unfortunately) and had to go back to the 16x15.
I barely noticed the difference surfing after swapping back. It's probably more noticeable getting up on plane but we didn't wakeboard at all until after the rock hit.
With the 16x15 and full ballast + 5 people and 600lbs of lead the ole 400 isn't thrilled but it will get up on plane and throw an intimidatingly wake. I imagine the 3591 will get there easier.
Point of this post is just to give my impression going from the 16x15 to the 16x13.9
Doing it over I would go lower pitch for more of an impact. The 16x13.9 is a great prop and likely the sweet spot between cruising and heavy weighted performance but it's not enough of a jump to justify switching from the 16x15 if you just want more bottom end IMO.
Thanks for the feedback Justin, the 16x13.9 replaced the 16x15 option this year on Supra builder.
Perhaps just a refinement over the 16x15?
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Keep in mind I came from a 2018 SA400 1.5 with a 15x12.5
The 400/1.76 16x13.9 pulls like a freight train comparatively.
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Oh yeah I was super impressed with mine when I got it as well. As time goes on you always want more though hahaha. With no ballast I love to slam the throttle from idle and I'm on plane in a couple seconds or less it's awesome.
My only real "issue" is surging a bit with really heavy weight surfing. With all my ballast and a boat full of people my boat will overshoot then undershoot the target speed rhythmically. A prop with a bit more bite should solve that. I didn't get a chance to test that much weight with the 13.9 but if it fixes that then all is well with the world.