Just wondering if 86 mph on gps is a good solid number for a 28ft. boat with a 500hp super charged with 5lbs of boost. Should it be faster or slower? Just looking for honest opionions this is gps not the dreamometer lol. Thanks...

What is the boat, what is the set up? Seems a bit on the high side.

John jr

2000 velocity 30 pitch prop from b-blades

non stepped hull, 86 probably isnt going to happen

Step or no step, seems high

My 28 with a 575sci will run 70. i know it isn't a race boat, but 86 sound high to me unless it is a new OL 29 in disguise.

Well a little more detail would help us. First off, is this a HP500 carburated engine with a super charger installed after and the ACTUAL HP rating is unknown? Or are you saying this engine is 500 HP after the super charger is installed? If it is the the first and the engine is producing 700-800 HP then I think it is very plausible.

Exactly, I should have elaborated as if it was a a 500 HP or 500 horse after the blower. I took it for a 500 hp boat after the blower.


John jr

It has to be a 500HP with an SC on top of it and probably making about 650hp.

Its 500hp with a super charger running 5-7 pounds of boost 2. 800 cfm carbs. wimple inner cooler
intake . 30 pitch b-blade prop xr drive aluminium heads. Just wondering if my numbers are close to what theu should be guys thanks for your input. Just wondering if i should be looking for more or if were close..