i have only ever used total pre turbo injection (15% of fuel flow).
what i have noticed is no negative performance difference in heat exchanger, mostly increases
same boost
no WI 59deg c charge at end of 400m test
with pre turbo WI 45to 47 deg c same test
the water may boil in compressor but it condenses again leading into IC and def out of it, i can see suspended water vapour clouds in charge pressurized water tank which takes feed just before throttle body. So i get the turbo efficency increase and also in chamber cooling as well for what i have seen.
in practice have run up to 28psi boost on 9:1 comp wankel engine where others are limited to around 20psi maximum on very heavy AFR's and retarded timing, so it def seems to be working. power is there too over different cars which means its not a one off fluke result.
i use a special water/air atomizer on my "ghetto" systems, as a result no compressor wear at all after many 1000's of km in field use. hope thats of some use ?
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