Its been talked about a lot here, but I don't know anyone actually using it.
I imagine they're using water instead of enriching the air/fuel mixture which obviously can help, but only under high loads. I'd imagine you'd get more benefit from the increased compression ratio. Still, neat to see some numbers attached to it.
BMW: Water Injection Can Boost Power And Cut Fuel Consumption
Quote:
This cooling effect can reduce fuel consumption by up to 8 percent, but also increase power by 10 percent, BMW says.
The carmaker also claims that water injection allows its turbocharged engines to use higher compression ratios, but still run on lower-octane gasoline.
With water injection added, BMW says it was able to increase the compression ratio of the 1 Series' 1.5-liter three-cylinder engine from 9.5:1 to 11.0:1.
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