Good morning everyone !

Going to be replacing my 502mpi with a fresh 555 making around 650hp. Current drive setup is a bravo with 1.5 ratio and dual external steering rams. Boat is a 26 foot ( 99 model so really 24 foot running surface ).

Turning a 27 pitch hydromotive to 5k with the current setup. Question is will this still be enough given the new horsepower ? New power is looking to be around a 5400-5500 rpm at wot.

Sounds like a nice setup that will really scream once dialed in! Good that you have hyd steering from a safety aspect. At the speeds your combo is capable of, hyd steering is a must.
You have a light fast hull which will help your Bravo live. Run a drive shower, change oil 25-30hrs, no jackrabbit starts getting on plane, keep prop in the water!

Always try the prop u have a baseline with. It will tell u alot. The 27p will be too small if you are spinning 5k now. You'll likely end up in the 29-32p area with future combo. BBlades and Hydromotive have prop testing programs to dial in your setup.

What speed are you running now? Stock 502mpi?

Sounds like where a 260 with a 502 mag would run.

Padraig

Sounds like a great setup. If it was mine... would at least run that 27 for breaking in the 555. It will also give you a great data baseline to pass along for the new prop build/selection. Good luck and can't wait for the results!

As you are in Jacksonville, you may want to give Mike at Hall Propeller a shout. He is in Christmas Florida and very familiar with Velocity. Also worked quite a bit with the factory and race teams.

Padraig