Quote:
Originally Posted by Isaac Zachary
IIRC the BMW has a limp mode if it runs out of water so you can't hurt the engine. But it will affect power. And yes, the (gasoline) engine has to be designed to take advantage of water injection. Otherwise it's very likely to not work, although I do wonder about replacing some gasoline enrichment with water at WOT. That would be a good way to blow up an engine if something fails of course.
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With aftermarket engine management, it would be relatively easy to have a level sensor connected to an ECU input, and have that input's state trigger a change in fueling or ignition timing characteristics.