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Originally Posted by cobra860
(Post 3481187)
Well I have a 1993 271 sr1.
I have installed a 540 whipple engine. 830 Hp. I run a bravo xr 1.50 and are into testing propellers, I run now 80 miles, at 5500 rpm, with a bravo1 28 pitch. The problem is now that the boat bounces from side to side and get really uncomfortable to drive. So I am wondering what to do.. I think I can lighten the boat for aprox 250 pounds or more. Time will show how much I can remove without sacrifising the comfort of the boat. |
jwurl- what kinda prop are you running and what are you slipage numbers? BBlades is doing some work on my prop trying to get slipage down. I am around 18% now. The boat runs very flat on the water, I would like to get some bow lift. Do you have that problem at all?
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I am currently running a box stock 28p Bravo 1 four blade. I know for sure i need to move to a 30p because it runs out of prop. I have no problem with bow lift. If anything it is to much because the boat walks like crazy at top speed. I heard your boat did 83 GPS with a full tank of fuel and 4 people on board with the previous owner???? Jeff Wurl
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I was told that also, if i can get the slippage down to 14-15% its possible. It has not done it with me driving, hopefully bblades can put the prop back to what it was before. We will see. My boat tends to walk a lil above 76, I can use tabs to control it but they always ends up slowing me down. I will say that full tank of fuel and 4 people or 2 it still runs the same speed, solid 77 best i have seen is 78 gps
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I have a 1997 271 fastech 454mag mpi with a 23 pitch prop she does 60 at 5000rpm just feels like it should have a lot more get up and go
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I own 2005 271 with 525 efi it's a heavy boat , I agree at times need more get up and go.
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2002 271 496 mag ho record is now 51,4 knots gps (5200 rpm) which is for about 60mph.
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I have a 98 with a 600hp 496 stroker, XR/-1, with a Scott baker/hering 28 bravo. Hope to see 75, will probably only go 50.
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99 with a 502 Mag and 26P prop on it, get about 63-64 on the phone GPS. If you bought it run, you bought the hull. There are faster 27' boats out there, but I think you would be hard pressed to find on with all the ammenities of this boat and run faster.
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I don't suppose that there would be any noticeable change by replacing the exhaust manifolds with something like EMI thunder exhaust ??
has anyone had any luck with changes like that ? |
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