idea of increasing cylinder pressure becouse of steam should be not true....if this will be true, just adding water will increase power, but it is not like this, not at all.
trakx: your idea is just right, I would recommend you to raise boost to knock offset level (first audible knock, without water). Than engage water injection and check that knock has gone-this is effect of water injection. Than turn up boost little bit more (maybe 1.2bar level, with water) and cerefully monitor EGT and AFR and listen for knock. You can try to go to AFR 12.5:1, but monitor EGT very carefully...
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