After running water injection in my z32tt for 7 months am very happy with it. Am the only Z32 owner in Arizona with water injection system, the hottest state in US where water injection can do wonders. With water injection my Z pulls allmost the same in 110F hot Phoenix summer as in 50f winter times. And I run same 15 psi of boost without ECU upgrade and the engine revs very quick. At this time around here all turbo cars run like crap exept my Z am happy. In my opinion Water Injection is must in hot and dry weather.
In cold and humid climate like east coast I don't think water injection can do much exept clean combustion chamber.Here is my original post of my system:
[[[ http://www.twinturbo.net/net/viewmsg.aspx?forum=general&msg_id=876525 ]]] Emission test after Water Injection:
[[[ http://www.twinturbo.net/net/viewmsg.aspx?forum=general&msg_id=829885 ]]] Combustion chamber after W. I. : [[[ http://www.twinturbo.net/net/viewmsg.aspx?forum=general&msg_id=836185 ]]] 
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Water Injection performance update - 
