Mercury 150 R RPM issue
I have a 2026 Suncatcher Fusion 324 RC. (Tri toon) Originally I had a 115 Yamaha on the back but wanted more from it, so I upgraded to a 150 R Mercury.
With the 115 my boat max speed was 30mph with perfect conditions.
Now with the 150R, it’s only at 35mph. However, I don’t think it’s reaching full potential. No one seems to be able to figure this out so I figured Reddit might be my best bet.
My main problem is the engine will only go to 5k rpms at full throttle and trimmed correctly. It’s strange, when I am at low mph, it will easily go over 6k rpms , but once I hit 10/15ish mph it won’t go over 5k rpms.
The prop is 14.6 x 15 P
I think the prop might need to be a 3 blade to achieve what I want. I was told by the dealership I got the engine on from that my max speed should be 45 mph.