02 38 Lightning, semi stagger, full cabin, 575SCi's w/704HP, -1 IMCO's 1.5:1, Hering 6bl 15.8"X35P w/22 degree rake.Finally got approved for drives and props (by you know who).The drives are on and props should be here in a week. As soon after the props arrive as I can we'll find out. It's a weather thing here in Seattle.How fast?Will it get on plane?Can I turn these props to 5350RPM?Boat did 96MPH on limiters hard (more than 1/4 throttle to go) with stock XR lowers and 32P5X's or lab 32 Maximus'

109- 111 say round 5000-5200. i dont think you'll get to the limiter with 35's with your ratio and -1's. unless you have a high x-dimension from the factory.

5350 rpm with 35 pitch props, if it did run 111 that would only be around 6% slip. I say 105, if it can turn 5350 without over trimming the boat. I hope that you do run 109-111 and I am way off. I have screwed up before. Monstaa has set up many boats, so he is probably right. Either way show us some pics of the speedo, be safe, and good luck.

I'm hoping for 106 and happy at 103. The boat's run at 12-13% slip with several different setups in the past which would put me about 103 with the new stuff. Can't wait til the props arrive.
Stock X was 19.5". I don't have ITS either.

So are you saying that effectively with the 1 shorty that you have a 20.5 x deminsion?
Allen

Thats still great.....its funny how we casually talk about V bottom boats running 103, 106, not too many years ago, that speed in a cat was unheard of. Fountains feel so safe at those speeds but it can be decieving, things can go wrong in a big hurry, so be careful, wear a lanyard and a lifeline, and I still wants some pictures of the speedo

03' 38 half stagger, its, 1:50 ratio, -2 imco's, 575's with a pulley, intercooler, brain re-map. 111.3 one way. 109.1 the other. half tank fuel. tachs said 5400. 34 x 15 3/8 hydro p5 with extended hub and polished/ satin finish.
you should be close. no its may drop 3 . steps are a lil diff.
you'll probably be in the 32-34 range with herrings.

good luck

19.5" X -1" = 19.5" X still but propshaft is 2.5" below bottom of hull instead of 3.5". Sorta like a 20.5 X just that the leverage of the drive on the boat based on a 23" propshaft to inputshaft dimension has been lowered. The plus is keeping the engine CG lower.

I would use a -2 !!!!!


U know u can always space down ,,but u can't cut them off !!

monstaaa,

What's your experience with the Hydro P5's on a 35 T/S? Mine is an '06 with 34" centers and a 19" X. Tom at Hydromotive was not real sure if the P5 or the P5X would be the pick, he was saying that the P5 would be better for a higher X set up.