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Old 01-22-2013, 05:28 PM   #1
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Default direct injection = more horsepower ?

does direct injection create more horsepower or is it just a more efficient way of getting fuel into the engine?
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Old 01-23-2013, 08:46 AM   #2
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By itself, I don't think so, but it allows you to raise the compression ratio, and also lowers emissions.
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Old 01-23-2013, 01:15 PM   #3
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I always had that exact same question. I always heard people saying the direct injection equals more HP. Is it because of the higher compression ratio that lets you gain more HP?
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Old 01-23-2013, 06:08 PM   #4
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di lets you run higher compression do to lower temps. Higher compression gives you more tq and that is more hp.
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Old 01-23-2013, 07:30 PM   #5
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im not an engineer but lookin at the new 6.2 model at the autoshow it looks fairly simple for a cylinder head company to take a set of heads and design them for direct injection on gen 3 and gen 4 motors. but then that would also require redigning fuel rails, injectors, and an intake manifold. probably not worth it
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Old 01-25-2013, 11:44 AM   #6
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Agreed^ doing DI makes you start changing stuff around for the same reason. Labor for all that is also more expensive.
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Old 01-25-2013, 02:32 PM   #7
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Agreed^ doing DI makes you start changing stuff around for the same reason. Labor for all that is also more expensive.
I think this is one of those situations where if you car didn't come with DI straight from the factory, it would probably be cost prohibitive to do a conversion, and for not very much gain at the end of the day.
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Old 01-25-2013, 07:27 PM   #8
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agreed^
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Old 01-25-2013, 07:27 PM
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