New on here heard it was a great site for powerboats. Have a 2000 formula fastech 312 with twin 454 mpi NOT the mag motors. have the factory 28 bravo one props on it and can get more then 3800 RPM 55 mph out of it. Anything i should look at that could be causing the low rpm. and is terrible getting on plan even with the k-planes all the way down. any help would be great thank you. new cap rotor and plugs this season.

Did you just get the boat and are those the props it came with? Have you tried anything else? They seem a little steep for that boat and power.

Often sellers will chuck on any old props they have at the sale. They may not be your best choice.

They're the props from formula good friends with original owner. i ran 26s last year seemed better but still wasnt getting into the rpm range id like to run it.

Did you try calling Formula and getting the info for the correct factory installed props? That would get you a baseline.

Isn"t the 454 MPI 310 HP, rated at 3800-4200 RPM?

4,200 - 4,600 rpm.

think its more like 4600 the mag is even more. atleast this is what im told

with the 26s i can get 4000 maybe 4200. thinking about having them sharpened to get a little more rpm out of it. would that help?

Your right 4200-4600, I had that same engine a few boats ago and remembered wrong numbers. You may have the factory props but they could have been damaged or modified along the way, or replaced with a same numbered set that were worked over.

Do you know anyone with a set of 24s to try?? How was the boat mid range with the 26s?