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02-22-2005, 01:08 PM #1Junior Member
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- Jan 2005
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- 20
Any modifications to Indmar engines to increase HP/Fuel effi
another dumb question.... I'm an incessant tinkerer and cannot leave stock alone.
My boat is a 2004 with the 320 HP Throttle Body FI engine. I see the factory offers a 350 HP engine, which has the same displacement and compression ratio. Supra offers a 380 HP engine with the same displacement and compression ratio.
How did they go about getting an extra sixty HP out of the engine? I know part of it is the different exhaust manifold, and the multiport FI.
Anyway to buy an aftermarket cam and/or exhaust manifold for these engines? Is it possible to remap the FI? I can hook my computer up to my motorcycle and remap the FI no problems, using an aftermarket blackbox and software from dynojet.
Is it possible to increase the HP and/or fuel efficiency through standard modifications?
I've got extensive experience on both automotive and motorcycle engines. I've rebuilt both, and raced motorcycles for a number of years (Suzuki GSXR 750, Honda RC-51).
On every vehicle I've owned I've changed the axhaust and replaced the air filter, etc, for increased HP/better gas mileage.
I would imagine you could do the same to a boat. Can you put a lower restriction muffler or a higher output exhaust manifold? How about changing the fuel injection mapping, or a different air filter.
I know I'm ignorant about boats, so please be somewhat gentle. Yes, I'm aware of the impact it might have on my warranty.
thanks,
john
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02-22-2005, 03:55 PM #2Member
- Join Date
- Jun 2003
- Location
- Louisville
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- 68
Replying to Topic 'Any modifications to Indmar engines to in
It wouldn't amount to much more than a few HP, but K&N does make high-flow marine flame arresters.
http://www.knfilters.com/marine/flamearrester.htm2006 Outback V
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08-26-2019, 07:01 PM #3Junior Member
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- Jun 2019
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- 18
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