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In my experience the tune doesn't change or need any changes when adding water (mine is preturbo). My AFR's didn't change at all when adding the water, my air temps didn't really change much either. They did seem to stay more constant on long pulls, and even when I increased the boost an extra 8 psi the air temps stayed the same. I never dynoed before and after the water or anything, but to me it felt a little stronger. I don't think it's a large increase in power if you keep the same boost levels, but when you safely add another 8-10 or more psi you definitely feel the power increase.
If IAT's were to drop then the ecu will compensate for the extra air by using the air corrections table.
Another thing to consider is the knock killing effects of water would allow you to run the car leaner and still be safe. So even if the tune changed by adding water the water would protect it. (although.. again, in my experience the tune doesn't change)
Peter (rice) how much boost are you running on the 50/50 mix with what turbo?
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