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The power increases are mainly due to the ability to run moe boost and more timing advance, you just have to tune it as such.
Keep in mind that water has a much higher specific heat than alcohol, which means that a mass of water can absorb almost twice the heat energy then that same mass of alcohol could (4186 J/K/C, versus 2549 J/K/C).
The additional octane from the alcohol is moderate, but not as much of a difference as the cfooling effect from the water.
Generally, WI companies such as aquamist wil suggest that you run pure water when the conditions permit. However, this does not take into account the octane limitations we have when we run pump gas. I'm not sure what the most productive mixture would be for street performance, but I'm thinking it would be a mix of H2O and alky, and it is very doubtful you want to use only one or the other.
....Kyle T.
93 TSi AWD "TURBO4"
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