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Originally Posted by niky
Properly fitted, water injection saves fuel on diesels. But I don't think you can guarantee fuel savings on ALL diesels without at least some ECU tweaking.
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Even in a mechanically-governed Diesel engine, some higher amount of moisture suspended in the air already leads to some enhancement to the efficiency.
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On gasoline, it might help on turbo cars, but from what I've seen, the effects on economy gasoline engines is minimal... usually a nominal power bump, if any, and at a level that doesn't justify the price of installation.
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With the EFI trimming the fuel to keep power and torque figures at the stock parameters, the cooling of combustion chambers provided by that small amount of water allows a slightly leaner burn even in a naturally-aspirated gasser with port injection.