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Originally Posted by NoDOHC
A couple things to mention:
Water and air are both fluids, but the water has much higher density, thus if it remains in liquid form, it will tend to puddle at any change in direction (you will see fuel do the same thing).
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I understand that, but that's not what 'he' said. Both air and water flow the same. They are both fluidic in nature and as such have the exact same flow properties (IE taking the path of least resistance). Surface interaction and atomization are independent of that. They both adhere to the laws of momentum and energy indicating that the particles with higher mass are going to take wider arcs than particles of less mass (from a Euler perspective). However if you take a cylinder and account for the Re (or the Froude number if you're doing size enlargement and concerned with speed) you get the exact same flow independent of what fluid the cylinder is placed in:
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I have not seen a study done, but I wonder if injecting pre-turbo does the compressor any harm (high-speed blade contacts water droplet, causing deformation of the blade, resulting in fatigue failure over time).
I know back in the carb days, the blow-through carbs were preferred, as the fuel would erode the compressor over time.
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It could cause cavitation based on the impeller design and temperature of the water. I think it unlikely, but if the atomization is poor enough it could cause other issues as well cavitation being the most likely.