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Water injection on a turbo diesel can be used for economy. Cooling the intake charge is important. Fooling the computer is very important. My plan is to super cool the intake charge. Wihout some kind of iat sensor bypass, the computer will retard the injection timing way out of the economy range. You can bypass the iat sensor with a fixed value resistor, and the computer thinks it's a nice warm sunny day. That's why I set up my 99 with an older style injection pump. No computer influence on anything.
I would love to inject the liquid propane directly into the airstream post compressor, but it would be too hard to meter. Anything more than about 25% propane and you blow up your engine.
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