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Old 05-01-2021, 01:35 AM   #11 (permalink)
It's all about Diesel
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Originally Posted by Isaac Zachary View Post
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.
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.

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