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Increase HP on Merc. 6.2 MPI

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Old 03-31-2010, 04:58 PM
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Default Increase HP on Merc. 6.2 MPI

I'm looking to increase the HP on my twin 2005 Merc. 6.2 MPI. The engines put out 320 HP at the prop now, I'd like to get the HP up to 375 to 400 HP the most economical and reliable way possible. Any recommendations for an easy fix, is there a chip that increases HP, etc.? Thanks.
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Old 04-01-2010, 12:14 AM
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Get a new engine.
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Old 04-01-2010, 02:37 AM
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Get a new engine.
Agreed. Going from 320hp perside to 400hp is only good for about 4-5mph.
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Old 04-01-2010, 07:18 AM
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Get a new engine.
Bingo...don't waste your money or time.
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Old 04-01-2010, 09:54 AM
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trade it in on something with blue motors
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Old 04-01-2010, 10:33 AM
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You would need to replace the intake manifold to get any power increase. The stock intake just doesn't flow enough air to support any HP increase. With a a carb or aftermarket efi, cam change and some head work you can get 400 HP. Beyond that, change engines or leave it alone.

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I'm looking to increase the HP on my twin 2005 Merc. 6.2 MPI. The engines put out 320 HP at the prop now, I'd like to get the HP up to 375 to 400 HP the most economical and reliable way possible. Any recommendations for an easy fix, is there a chip that increases HP, etc.? Thanks.
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Old 04-01-2010, 11:04 AM
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whipple charger mite work
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Old 04-01-2010, 11:29 AM
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Those were my initial thoughts too, I'll probably keep the boat for another season then look for something new in the winter months. Thanks for the responses.
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Old 04-01-2010, 12:13 PM
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whipple charger mite work
I remember Uncle Toys tribulations with those on his 6.2...what a saga that was.
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Old 04-01-2010, 03:25 PM
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You can pull over 450 a side from them. You will want to pull them, rework them and add boost. I would go that route except for the fact that there are some great deals out there on boats that already have big power.
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