I found another interesting paper.
https://www.researchgate.net/publica...sooctane_fuels
It seems that between 80 and 90 degs is the sweet spot for minimum fuel consumption.
Still no idea what addition of water will do to this.
Thsi has started to appear more and more logical to me. I believe that the method I propose is an effective mean of adding a precise amount of heat to the intake. (I still need a sensor to measure steam temperature, and some data logging so that i can predict what will happen as there will be a bit of delay between steam water injection and steam generation, this delay will also change the steam temperature.)