TAStevens

Need some advice from those that have tried both. It took WAY too long, but FINALLY got this pig running! 1988 Formula 311SR1, complete re-power, had 420's/TRS but I want her biullet-proof so replaced EVERYTHING, New 572's no corners cut 735hp on pump gas, NEW Huber Trannys, NEW Konrad 540PRS drives with Optional lower, etc...Alternators, sea pumps, powersteering pump, ignitions, starters...new! Heres the question, the Drives were tagged WRONG! We "intended to turn the props OUT and they are spinning IN! Been the story of this build (long story!) Leave it alone? Change it?? HELP! Thanks!! Tim PS - retaining the Silent Thunder platform (been reading a LOT about these) Cut the flappers out. Have CMI Big Tubes...sounds GREAT....going to try as is before cutting holes in the bottom??

ezstriper

most boat will run a tad faster with them spinning in...fountains all run in, but harder to dock in close quarters, but with what you have would just be trial/error. if not bad to dock I would run that way

Mr Maine

Most Formulas spin them out. I think with your setup you should just try it both ways. What props are you going to run?

TAStevens

Im wondering what it will want for props? heavy boat, TONS of Torque! at only 2000rpm already making 615. Max Power at 5750. Max TQ at 4500 (655)...does anybody on here have a "similar" combo??? I also put Full Hyd Steering on, going to be a "tick" faster than "stock"??!! Went 68mph w/420/TRS.....curious what she will do? 90???

MILD THUNDER

iTrader: (3)

You are going to have to experiment with prop rotation, and style of prop. I think handling is going to be your concern. Id focus on which setup offers the best handling at top speed. The 311 hull was never really designed for 90mph, so it may take some setup time. Id prob start with some 28 bravos and see what you have going on.

Props spinning in, nets bow lift. Props spinning out, lifts the stern.

TAStevens

My EARS are OPEN! I don't see at lot of WOT as Stock it scared my Girlfriend! lol Tempted to leave them as is and try it....supposed to be 55 and sunny Saturday, Boating in MI in mid December??

frickstyle

Tim, cool, so you got it running, great! I was gonna ask you then saw this thread.

How did everything go? You should post some pictures, and let me know how it runs when you get it out on the water.

Play with this:
http://www.go-fast.com/Prop_Slip_Calculator.htm

How much does the boat weigh? I have a set of props but they are only 24s, way to small for that setup. I would think you can spin 28s, and would put you at 90mph with 12% slip. Someone on here has probably done it before with your boat, I am not fluent enough to advise on what would be best. Someone will chime in.

Just curious % wise, how much do you think you went over budget from when you first started? Including the upgrade changes, and all. I am at about 275% of my budget from when I started 5 years ago.

MILD THUNDER

iTrader: (3)

I would take it out and run it !

TAStevens

Hey Justin...good to hear from ya...ya..took WAY longer than I thought but I did everything "right" no short cuts, I could write a Book with the :"issues" I ran into! I have a folder with all the receipts, etc...havnt had the "stones" to open it up and add it all up! lol...All new custom upholstery is next. Sure I am in for Double! Ive got a pair of 25 3-blades that were on it and a pair of 32 4-blades I can try. No way the 25's will work so will throw the 32's on, probably too big but I REALLY want to get her wet! I have talked to some guys with 550hp/side in these 311's but havnt found anyone w/735/side...anyone?? would LOVE to hear! PS - Don't think there will be a line at the dock??

donzi matt

iTrader: (1)

Don't add it up. Don't EVER add it up. I have a stack of receipts this off season that I avoid eye contact with at all costs.