I am running a somewhat modified Precision kit on my ZX3 - it is based on a Garrett GT28R. I tuned it myself using SCT chip burning software and a J&S Safeguard monitor to keep an eye on knock sensor activity. I am running 12.5 PSI with 92 octane and an Aquamist 1S with a .5mm jet and 75/25 water/methanol.
I have found I can run about 4 degrees more timing with the water on, or about 2 extra pounds of boost. With no changes at all (timing or boost) during back to back dyno runs I found I lost a little torque below 4K, but gained 3-5 whp across the board above that point with the water turned on.
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