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Turbo a 5.0 Mercruiser

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Old 02-25-2009, 10:12 PM
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Default Turbo a 5.0 Mercruiser

It seems that everyone is very happy with their turbo setups, which ever way they went. I have a 96 Bayliner Capri Classic V-hull Boat with a Mercruiser 5.0 in it. It is almost a new motor, the old one crapped out and we got this one with like couple hundred hours on it or something, anyways, it runs strong for what it is.
I was wondering if it would be sensable to turbo the 5.0? And if anyone knows alot about boat, how hard would this be to do? Current top speed is about 54-58mph
Old 02-25-2009, 10:15 PM
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My buddy just finished putting a blower on his mercruiser....and tuning it.
Old 02-25-2009, 10:18 PM
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I'm very very sad to say, A supercharger would be way easier on this application.. Unless you don't need to cool the exhaust. Your top speed it pretty damn good for the 5.0.. Alph I outdrive?
Old 02-25-2009, 10:18 PM
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Originally Posted by BlownChevy
My buddy just finished putting a blower on his mercruiser....and tuning it.
I thought about a blower, but the new motor has lots more bottom end and was wanting some top end, wouldn't a turbo be a little better for that...
Old 02-25-2009, 10:19 PM
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Not to **** on your parade, but that boat isn't running 55mpg with a 305 in there.. It might say that on the speedo in the dash but not a GPS. You will need a solid 410 hp to get close to that in that boat. A blower would be the simplest way to go.. I would put a built motor in there
Old 02-25-2009, 10:20 PM
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Originally Posted by Wilde Racing
... Alph I outdrive?
Yep...
Old 02-25-2009, 10:23 PM
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Originally Posted by Mangled03gmc
Not to **** on your parade, but that boat isn't running 55mpg with a 305 in there.. It might say that on the speedo in the dash but not a GPS. You will need a solid 410 hp to get close to that in that boat. A blower would be the simplest way to go.. I would put a built motor in there
Well one, its MPH, and two, the speedo stoped working years ago, we had it clocked along a low bridge along Lake Norman in NC
Old 02-25-2009, 10:25 PM
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The old motor would do about 43 when the speedo worked, and the motor we got was from a performance shop, they replaced the 5.0 it with an LS1 in there boat. Wish I'd got to see it run, but I don't know exactly what is done to the new motor.
Old 02-25-2009, 10:27 PM
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Originally Posted by Mangled03gmc
Not to **** on your parade, but that boat isn't running 55mpg with a 305 in there.. It might say that on the speedo in the dash but not a GPS. You will need a solid 410 hp to get close to that in that boat. A blower would be the simplest way to go.. I would put a built motor in there
^^He is right, if you are using the water pressure gauge speedo, it is almost as accurate as the fuel gauge...

I'll have to check my book at work, but the Alpha cant handle too much more power. When I was looking into this same idea for my boat, I figured I'd want the Bravo. I'll have to double check when I get to work tomorrow...
Old 02-25-2009, 10:28 PM
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on my old bosses boat we stuck a roots style blower on his 5.7 mericruiser.. i think a blower would be the best way to go


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