Injecting prior to turbo comp' impellers

[leman_opc]

Just a couple of thoughts why I may not be seing any gains in air consumption:
1. My flow issues and hence simply not enough water injected pre-turbo.
2. I was looking at max air consumption but not at the whole curve. It may have been that the air consuption gains are there but not at the peak point.
3. The whole concept is around the compressor efficiency gain, but it has been correctly noted that the energy consumed by the water evaporation in the compressor is still produced by the turbine part, hence the efficiency gain of the turbo in whole is debatable. Based on above logics it may occur that if the compressor part is a restriction for more flow then preturbo injection may have better results compared to the case where the exhaust mainofld is restrictive, in the latter case the effect may be only minor (if any).

The first 2 points may be remedied. I'll double check.

The last item is hard to verify but I believe the high exhaust manifold backpressure could be my case.