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Originally Posted by PuntoRex
Dyno is surely good, but too much water can be easily felt.
I'd used 1S system for a couple of years, in some cold winter days, the "summer jet" could be felt obiously. Engine output was clearly softened & faded. Swapped to a smaller jet immediately livened it up.
The other example is once the manifold pressure switch failed, the water was continuously injected (in a rush hour traffic jam) until I could find a place to pull over & unplugged the fuse. I barely managed to do that because when low rpm/off boost/idle, full flow of 0.7mm jet really made the engine stumble. I could only kangarooed along weakly. By this, the water for a whole week was injected within several minutes.
Fortunately there's no permanent damage.
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Interestingly, we have a few nervious users putting two pressure switches in parallel (806-157) electrically. Being normaly closed switching configuration, both of the switch has to be open-circuited in order for the WI to activate.