More water = ecu pulling timming.

[cmj]

I made some changes to my setup, and increased the amount of water. I knew that a retune was in order and logged some wot runs before the retune. The ecu was not happy and pulled timming, dropping my aim(WRX) to 2. I knew before hand that I would need to pull more fuel and add timing but i did not expect the ecu to pull timing.

Any ideas why this would happen?