Quote:
Originally Posted by clarknova
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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The EGR is *not* lowering the EGTs as long as the engine isn't running rich.
Even cooled EGR is hot compared to ambient air/charge air after the intercooler.
The point of EGR in diesels is to get closer to stochiometric ratio to reduce the amount of oxygen that can react with nitrogen, reducing the amount of NOx produced.
However that's a tradeoff with particle emissions as these increase when you run less lean.