Quote:
Originally Posted by Isaac Zachary
I don't understand how cooled EGR works better than air, but water I can understand since it changes phases and reduces temperatures that way.
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As the recirculated exhaust gases are inert (or at least supposed to be), they're meant to keep the AFR richer without an actual increase to fuel volume at the intake. Eventually a hot EGR flow could also lead to a more complete vaporizing of the fuel, which may become desirable while driving on cold weather. Water injection is more useful on hot weather, or with a somewhat extreme load.