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Water will do you more good than alcohol as it has a higher specific heat. In order to really see the benefit of wi systems you have to either use it to a) make up for too small of an intercooler or b) use it instead of all of the extra fuel in the cylinder, a la lean it out.
oh, and I would start injecting at more like 8 psi. Your system will vary this, but for most, in order to develop adequate pressure, the pump needs to kick on about 8 psi to be spraying at around 12-15 and higher.
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