That's a really nice set up - I couldn't go with the 14-71's and fit under my motor hatch...have an 04 style hatch and wanted to keep it. Have zero blower surge with pro-charger set up....think that's why they "feel" so tame. Have 1.62 gears in #6's turning in. With 1100hp, you will be able to break into triple digits....just be aware of that fuel/balance issue once you start rolling into the mid-90's...night/day difference...it's more like an even worse "hop" than a porpoise...very similar to your Avatar...not a good feeling at those speeds!!!

I believe when Craig had this one, he posted here w/pic that the best he saw was 112mph w/1240 Sonny Lenoard quad whipples in it. He had a set of 16-1/2 x 33's if memory is right...the boat does like smaller diameter...17 is too much. I have pretty much the same HP but way more torque in this set up

16-1/2", really? Drives even with bottom? I had trouble getting on plane with 17-1/2" x 32s. I currently run 17-1/2" x 30p and it still struggles getting on plane with full fuel.

I can see that on the top end, it would like the 16-1/2", but hard to believe your boat runs well with the smaller diameter. I am going to get the 32s worked on, bump the pulley down a little for next year, and see if I can get there without too much more $$$.....

The prochargers are definitely cool, and sound wicked spinning that fast. I don;t want to screw with the boat too much, I really just want to go boating. Also, a little timid on blowing up #5s, they do have their limit, and I prefer not to know what that is...

92. Carbon fiber top gun bought in01 with 502 Eli's 62 mph repowered 05 with 600 mercs xz's 87 mph out of fuel no passengers repowered 09 1000 mercs dry sump sixes 101mph turning 17.5 X 34 4 blades

about the porpoise problem I owned a 97 tg half cabin Kevlar called big kahuna it had 600scs from factory rebuit to 750hp with bravos 380 k planes had to run tabs to # 6 to stop porpoise hated the boat .put 5 blade hydromotive props spinning in or out no more porpoise hope that helps

I'd say thats pretty dialed in. Turning 33's to 5400 and 100MPH with 1.62 drives, thats 4% slip. On an old straight bottom top gun , thats amazing slip. Most cats can't even get that.

That boostane is interesting stuff. What octane level do you shoot for, and how much boost you running? Seems like an affordable option to race fuel

650 hp 540s #3 drives 1:40 gear ratio running 26p 3 blade 16.25 diameter props. saw 81.4 on gps at 5300rpm in perfect conditions but it will run 76-77 every day. My boat hates larger diameter props too porpoises worst the larger diameter I run. And by perfect conditions I don't mean under the peace bridge going with the river current I think I could hit high 80s there lol

I wish.....More like 9%....34's at 54-5500 at 100...with the 33's at 5400-ish it loses a bit down to 95/96. Boat has allot left in it but Season is about over up here so will get the 34's to 6200 next summer when I grow some bigger Kahunas for more trim over the winter:evilb:

I won't run my motors without Boostane....not worth the risk. Not really for the octane boost for me, it's more about the fuel treatment. I run one quart per 100 gallons on 93 pump gas, on harder run days I'll run two quarts per 100 for a little piece of mind. Had a buddy blow up his fresh motors early this summer from local marina gas and forgot to add it in...have seen this movie, and lived it WAY too many times. It's shocking how many catastrophic motor problems come from crap gas...marina or station. Super cheap insurance IMO

Saw you headed into Sutton Bay two Saturdays ago. Looked and sounded great. One of the better 90's paint jobs.

When it comes to planing, my boat doesn`t care about diameter or how many blades. It`s all about the cup. 18" 5 blades and little cup= 5000rpm burnout for 5 minutes.


Now this thread is all about "my boat hates large diameter props" when the last one was all about large diameter to stop the porpoise. **** this I`m getting a Fountain those bastards run straight as an arrow.:evilb:

^^^Too funny Dan.

There is some good info here though, please keep sharing, because it might save one of us thousands of $$$ in setups, props, etc.

I also run Boostane for the safety factor, similar mixes to Raptor above, cheap insurance I guess. I am not a Chemical Engineer, however, seems like the stuff works. If I could get a season together, and figure out this setup, would be a happy man.

Seems like 1000hp, surface drives, and the right props all boats pretty even @ 100-103mph. How much does it take to get to 110? 1200hp?

In all honesty, all the hype I've read about these boats, I'm not exactley blown away by the handling in big water at faster speeds. You'd would think these things drive themselves through 6ft waves without having to "drive" the boat. Not what I have found to be true.