Sorry to reawaken this, but I just want to put the record straight on this.
Pre-compressor injection offers a host of benefits. In a nutshell, injecting water (and ideally a few other miscible fluids of high specific heat capacity) pushes the compression from adiabatic to near isothermal. This is way more efficient (up to 30%). So you can reach the same boost for considerably less exhaust flow.
Yes atomisation is critical, but the technology is there.
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