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Originally Posted by PuntoRex
It said, "The new water injection system is able to deliver precisely the right amount of water to each of the four cylinders and is a significant improvement over the previous unit."
But I don't see "direct" injection.
So, would it be some kind of port injection like sequential fuel injection?
I saw 2 suspicious metal rails across the manifold runner, maybe...
Below that, in the right side where we can see, there seems another rail for fuel...
Or that's for water & the upper ones for fuel?
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It appears that the injection is very similar to Ford Focus's WRC twin rail WI/FI the season before. Water is directed towards the inlet valves to minimise pre-ignition (aftermaths of anti-lag), cooling the inlet valves has great benifit to induction efficiency especially if the water delivery is sequential.
Complex multi-channel EGT monitoring management will allow water quanity trim to each cylinder - for the subaru - this is essential to balance the heat distribution amongst exhaust runners and manages the uneven water ways that runs around the two heads - flat four engine is a pain to cool.
I am only guessing.