I tuned my car with water active to 12:1 afr, since then I fitted an intercooler and the water doesn`t com on as much (mostly not when it`s cold) - but the afr`s are the same.. I`ve come to the conclusion that injecting de-min water only has no effect on wideband sensor readings..
If you`re runing water normally I`d tune it with normal pump gas and water on, I used 20% by volume water/fuel.
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