Based on my experience I would "guess" that the answer is it may help some.
It makes the compressor more effecient (it takes less work to reach a given flow)
That implies that there will be less resistance for the turbine to overcome to reach a given flow so it should spool a bit quicker.
I know in my setup when the pre-compressor injection was working the turbo seemed to hit very hard when it turned on.
Sooooo the seat of the pants dyno says it might work but only some before and after testing would give you solid data to work with.
If I remember the NACA studies correctly at 3% water to air flow by weight the compressor flow increased about 10% over its normal flow, so I would think it would not be unreasonable to think the compressor should come on boost 10% quicker. If you hit full boost at 3500 rpm without it then perhaps you would get to full boost at 3200 with the injection.
Only my gut reaction but it sounds reasonable to me.
Larry
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