Just took my boat out for the 1st time this year and was trying to test performance from last year after rebuild on carbs and blower.
Boat is a non-notched Cigarette 31' Bullet. Weight should be about 9300-9600lbs with 2 people and about 75 gal of fuel.
Engines are 454's with B&M 250 blowers running 6-7lb boost. Not dynoed, but mechanic tells me 550 or a little more is a good guess for HP.
Boat has 1.5 Bravos in stock location and was spinning 27P Mirages. RPM was at 5200. Max speed with 1-2 foot chop was right at 71 mph by GPS.
After punching in the numbers on the BAM website, it showed a slip of 20-21%. These slip numbers seem high. At the same time, the speed seems low. What could the problem be? I'm thinking of going to 4 blade 26s, but want to find out what's wrong first.