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5.7 GI to a 5.7 Gxi
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Author:  atlmover [ Mon Nov 10, 2014 8:20 pm ]
Post subject:  5.7 GI to a 5.7 Gxi
Just trying to figure out the difference between these two motors to gain 40hp? I have the GI and my boat runs great but 40hp. Wondering if its different heads or maybe just a cam swap with bigger injectors? Maybe flash my computer and a cam and pick upb40hp?
Does anyone have any info on that? Little extra acceleration and top end would be nice.
Author:  Surface Interval [ Tue Nov 11, 2014 4:03 pm ]
Post subject:  Re: 5.7 GI to a 5.7 Gxi
The Volvo Penta web site has an on line parts list.

http://www.volvopentastore.com/Engine-P ... ore_id.366

Looking at engines from about 2002 as a sample, the 320 hp 5.7 GXi uses roller rocker arms where the 280hp 5.7Gi does not. According to the parts lists I looked at, the crank, cam, heads, pistons, etc. are the same. In about 2008 -2009 Volvo changed the horsepower rating of the 5.7 Gi from 280 to 300hp while using the same standard rockers. I have heard that some people felt the 280 hp was a conservative rating. Starting around that same time, the 320hp 5.7 GXi max rpm also went from 5000 rpm to 5200 rpm. The 5.7 Gi max rpm remains at 5000. These engines are all multi-port fuel injection. I am not sure what tuning changes have been made in the engine's computer.
Author:  atlmover [ Tue Nov 11, 2014 11:04 pm ]
Post subject:  Re: 5.7 GI to a 5.7 Gxi
Thanks for the info. I guess my motor mist likely is a 300hp motor so I'm shy 20hp. I would imagine that's a computer flash/mapping. Maybe there's not much of a difference.
Author:  deafwish [ Wed Nov 12, 2014 3:00 pm ]
Post subject:  Re: 5.7 GI to a 5.7 Gxi
You wouldn't notice a 20hp difference on the water, any way! :wink:
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