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Old 12-24-2021, 10:28 AM   #24 (permalink)
EcoModding Lurker
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Merc - '97 Mercedes V230 TD Fashion
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Sorry I'm late to this thread, I just got the email.

Originally Posted by Autobahnschleicher View Post
A diesel engine usualy has no throttle.
Modern diesels use EGR to make the engine run richer without adding more fuel.
This results in lower NOx raw emissions, wich need to get converted to nitrogen and water by the SCR catalythic converter.
Not exactly. The purpose of the EGR is to reduce cylinder temp, which reduces NOx emissions. Any resulting change in AFR is just a side-effect.
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