I am going to take another shot at diagnosing my low rpm. My understanding from others who own this boat and the published info I have found state that this boat should run close to 40mph and 5000rpm at wot with the factory 24p props. I have recently just had all 4 heads rebuilt, new gimbal bearings, fuel injectors, fuel filters. The engines are now in top condition and puur like kittens when synced up.
Boat Info: 2003 342FV, 24P props, 2.20:1 B3 Drives, Bottom is clean, new fuel.
Fuel pressure on both engines reports back: 45 during pressurizing with engine off, 40 when pumps shut off with engine off, 38 with engines running at idle.
I have found some water in the separators, which i keep swapping out to remove the water from the tank.
I notice on the port motor 97.97* is wot, and the starboard is 99.11%. Should I be able to reach 100%??
Couple things i want to note, at less than half throttle, the starboard motor on the sync gauge seems to require less throttle forward then the port motor does. Once you go above 50% throttle forward this switches drastically to the port requires less than the starboard to balance. It is very common for the port throttle to be about 55% throttle forward and starboard to be 100% when wot and the engine balance gauge synced.
I have also noticed that when pulling back to approx 55% throttle forward on port motor that I am still able to maintain nearly the same rpm as wot however the throttle position in the ecm knows I am at 55%. There seems to be no new power past 55%.
Here is the ABSOLUTE highest rpm i was able to achieve in my port motor. I state absolute as the average high rpm is about 100 rpm less.
Here is the ABSOLUTE highest rpm i was able to achieve in my starboard motor. I state absolute as the average high rpm is about 200 rpm less in this motor.
I attribute the 10* Manifold Temperature difference to the starboard was recorded first on a first run, the port was immediately after which the engine bay would have been warmer.