I recently came across a
research paper which may be of interest. Tests proved that increasing EGR in a diesel lowers exhaust gas temperatures, which lowers NOx emissions, but too much EGR will increase PM and won't help milage.
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is
where you're going, not
how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread