98 3100 questions
 

Have a few questions about a 98 3100, 500efi's, standard bravo's- no boxes

What is the porpoise range, 65-75?
What kind of speeds can be expected with the stock 500efi's
What prop pitch, assuming the drives are 1.36 -- trying to verify

Thanks in advance!!

porpoise can range from 75-85 depending on the water conditions
500efi's should run low 90's
30P 4 blade bravo

I would question the 1.36 drive ratio. For that power level, should be 1.50 Owner may have had some higher level of power plants in the hull previously and not changed the drive gears. Are props currently on the boat? If so, what are they?

That boat should run mid 90's all day in good tune. I would say 1,5 is the ratio you want.

Wannabe

I have 500HP's carb in my 98 31
30p 4 blade Bravo
slight porpois 75-80

Standard length lowers? That makes a big difference on a 31. I have a 98 also.