Addiction. Think my post came across wrong. I wasn't having a digg at you saying you were wrong, just I didn't think disconnecting the water was a bad thing. I was told the water cooling, although is handy if its your average jump in the car, tear down the road for 20 mins then park up at the supermarket, not caring about your turbo. But ripping around a track all the water cooling is doing is sending higher than boiling temp water from the turbo around your engine and oil "cooler" and in fact making the whole car run hotter.
Your right that water cooling will aid the life of the turbo. But speaking from experience disconnecting the water cooling from my turbo cut the water temps by a 1/4 on the standard temp gauge.