so whats the speed diff with the same props ?

The 1.50s with 4 blade 32s stock mercs ran 98.5 @5800rpms and the 1.30s with 28s stock ran 88 5200rpms.

Sounds like that gear ratio doesn't work on your boat!

Hopefully the Max Machines treat you well, I kep blowing IMCO's.

I'm noy sure if its gear ratio or just the drives but all i know is i was told 2-3 mph lose before i bought these drives and i was ok with that.I was told a month ago that he would take care of the problem and make it right.Now that i have tested with a new longer tie bar and rerigged it with a friends 1.50s and got the final results showing its the bmaxs and not my motors,they won't return my phone calls.All i get is he is with a customer.What the hell am i,i know he already got my $$$$.I am thinking of renting a spot at the miami boat show with these drives to show how to make a boat go slower.
I hope this doesn't loose any business for them.Just tired of broken promises.I didn't pay $24,000 to go slower atleast not 12 mph.

DOCMANRICH 37 why are you selling your boat, seems like you just dumped a bunch coin into her?

Tired of being frustrated.I did dump alot of $$ into it and my wife reminds me everyday.The bmax drives just don't work for me and tired of manufactors saying i'll make it right and not doing anything that will cost them any $$.Dustin at whipple is the only one that has stepped upto the plate and has bent over backwards to get my boat dialed in.Thanks Dustin.If the boat sells then fine and if it doesn't then well i guess i'll just go 12 mph slower then i did before.

2-3mph loss is a good estimate if you are comparing the same gear ratio and prop pitch.

If you tested an XR with the 1.35 ratio it would run about 5 mph slower than a 1.50 for V-bottoms. (I've done it)

Since the Bmax is 1.30 ratio, and it has more rotating mass you will lose 2-3 mph more.

If you had the prop dialed in perfect you would pick up about 2-3mph. (Not that you want to go that route at this point)

If Bmax offered a 1.50 ratio, I'd run 110+, but they don't at this point. So I run 8mph slower and spend less time being towed in.

Bottom line your speed is exactly what I'd expect given your setup. If you want to try for more with the Bmax drives you need to try shortys, and other props.

Sorry you didn’t know this going in.

Not saying your wrong but all i know is i was told before i ordered the drives from the manufactor mouth that 2-3 mph slower is what i would see.I was fine with that aslong as the drives held up the way he said they would.The new crescent lower was to make up that 2-3 mph lose but it didn't.

I lost 2 mph with the same props and gear ratios you were running. I don't understand why your setup is so different though. Prop slip must be coming into play, are the drives slightly deeper than an bravo causing your prop to bite more?

Honestly, I'd try and have Dean set the boat up for you... Ship it down there and have him get it right...

According to the dyno graph...your making about 50HP less per motor spinning 600rpms slower at WOT.
Send those 28's out and have them labbed/thined out with some cup taken out also.
Or get something on there so your spinning at 5800 for max power again.
I would hate to see ya throwin in the towel with $55K in upgrades just not having to lab some props.