i own the last fountain made from fountain factory in 2011 since 4 years right now it came originaly with 600sci and ITS BOX xr drive with shorty ssm lower maximum 5 blade 28 pitch.. i chamge programationbox computer and wheel upgrade stade 700sci.. run 83-5 i want to find way to reach 90 ! X ratio too high? Swap xr lower? Switch to 4 blade biggest pitch ?? Help me please!!

I would think you could be running faster than that. I have a 05 29 575 and run 81-82. Running stock XR with 30p Bravo 1... the Maximus 28 on the boat runs about 77-78. I think the 5 blade is better everywhere except top end. So if you want too end- I’d say put a 30-32p Bravo 1 on it.

Thanks !! I will try xr long lower and 4 blade props .. think im gonna be able tonget good on plane with all the power i got..

Well mine is a 1:50

I wont advice for appropriate prop on my 29 fever run 78 presently with maximus 5 blade and ssm bottom with ITS box extention . I know x dimention is high but dont know if its 19 or less ... expect to reach 85 with mupgrade 600sci computor bx and wheel chamge 2 years ago. Love the boat but enable to set prps drive for good launching and top end . Lot of choice about pitch size of the news max 5 short tube 15" (inboard recommandation size) about 28 to 34 . Anywone can help me about appropriate sise of props or spacer