I'm looking at buying a Carver 360 Mariner with Crusader 330 hp 5.7FI Captains Choice engines. Absolutely love the boat but the test drive came up with a 20 mph TOP speed per GPS. Tachs were turning at just 4000 RPM which I believe is low. Props are four blade 20 x 21s. Boat had pretty much full fuel and full water and 4 people but otherwise fairly empty. 3500 RPM got us approx 15mph (not Knots) and seemed to be working hard. I was VERY Disappointed.
Anybody out there that could give me comparative numbers from their 350 Mariner (same basic boat) or 360 Mariner Or any suggestions of what might be causing this or better how to improve it. Carver told me that the boat should cruise at almost 20 knots and should top out at 26 - 27 Knots. Comments PLEASE!