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Originally Posted by Forum Admin
Engine's output is mainly oxygen related, mass-increase as a whole in the intake may not yield extra oxygen available for combustion if a large portion of the mass is water molecule. This is an interesting topic to discuss if there is an actual oxygen increase.
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Indeed.. this is why the data I would really like to see on the subject is output of the engine's MAFS compared to MAP and RPM. If no more air enters the vehicle intake, the turbocharger has not been made "effectively larger." It still feels like a big leap to me to state that water injected into the compressor will directly increase the efficiency of the compressor (vs. just reducing the outlet temperature). It may be that this is just a peculiarity of centrifugal compressors, or it may be that details that affect one type of system are being inappropriately applied to a combustion engine's turbocharger. Dyno results can be dubious on these issues.