primetime

I cant seem to break 82mph I have a 34' advantage with twin 620's and bravo drives.I have tried going from a 4 blade prop to a five blade, lower and raise the drives even diffrent rotations on the drives,I have even taken everything out of the boat for less weight.Everything I try shows the exact same speed on gps speedo.Does anyone have any suggestions other then engine mod.

Turbojack

Is it staying at 82mph with different changes. Or is 82 the best you have been able to get. I think we need more info.

primetime

It is staying at 81-82 no matter what change I do.

masher44

RPMs the same too?

primetime

No,now with the five blade I droped from 5600 to 5200 rpm but a 25 pitch is to small always hit red line.So the five blade is getting me more speed for the rpm but I know that 400 rpm left is where all the power is.

bripar77

How old is the boat? Check for excessive hook at the transom.

VP

i agree -- check for a hook in bottom

Dave M

Have you compared notes with anybody with the same hull or the manufacturer?

primetime

The hull is a 2002 and yes I talked to a guy with the same year as mine and he is running 84 with 575's and four blade props. That is a good idea about the hook I have not checked for that. Thanks for the advice I will get back to all of you and let you know what I found.

jpclear

Yep, if you have "hook" you will hit a wall reguardless of how much power you put in. --- JP