Water injection can really increase power by pushing the knock limit higher. One can use more optimal ignition advance and considerably higher boost. Just water can give 15% increase in power, Water+ethanol 25% and Water+methanol 50%! Of course, your turbo and fuel system had better be adequate too! The amount of water or mixture should be about half of the fuel delivery at peak power (0.3l/min of water for each 100hp).

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