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Old 06-23-2015, 08:50 AM   #1
pikachu77
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Default Lowering compression in an N/A

Hello, i am the owner of a 2011 na impreza 2.5i and i was wondering if it were to be possible (well anything is usually possible with effort) what would be the requirements for going about lowering the compression so that an n/a motor could hold a small turbo? I know that most people will say just make a swap and that it will lead to more down the road because it requires forging internals but im just curious as to how to go about this. I like projects that tend to go in an odd route of differnces. Even if itnis a litle more than overly costly in the long run. Thanks in advance.
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Old 06-23-2015, 09:20 AM   #2
Garret 2010i
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Chapter/Region: W. Canada
Location: Winnipeg, MB
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well im sure u can get a lower compression piston, probably the best route.
depends on how much u wanna drop. adding and extra head gasket will drop compression
some...
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Old 06-23-2015, 09:26 AM   #3
pikachu77
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How much do they usually run for, or which pistons would be the best route to go with
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Old 06-23-2015, 08:13 PM   #4
wtdash
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2016 Focus RS

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Why 'ruin' a (assumed) perfectly good running car? If you want a turbo, sell>buy WRX.

Or if you want a project, buy an old Impreza or Legacy and turbo that.....probably be cheaper overall anyway.

....and devil's advocate states: 'If you're asking these questions, you aren't ready'. Please get your self a comfy chair and spend some time searching the Build Journals on all the Subie sites.

TD

Last edited by wtdash; 06-24-2015 at 12:52 PM.
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Old 06-23-2015, 08:21 PM   #5
Hondaslayer
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-Moved from N/A forum
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Old 06-24-2015, 12:10 AM   #6
bomberlegacy
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N/a motor can handle a small turbo as it sits in stock form
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