Egr was first,to lower nox,then dpf with egr,then dpf with egr with def(scr-supplemental catylist reduction).The dpf only system removed 'smoke' particles-you have a soot free exhaust pipe.To keep nox (nitrous oxides) down,along with the egr, the fuel timing/amount made more smoke which is removed by the dpf.Then with def the fuel timing/amount is adjusted to make less smoke,but more nox which is removed by the def system,and dpf removes the smoke,which there is less of.So a def system will need to less regens. As far as the turbo,when you have an egr you have a varible vane turbo.It has to react to the egr position,and keep the boost pressure steady by changing the vane position Simple.Easy peasy.And it all has to work perfect so the ecm does not derate the engine.It does that so you have to keep it working-you can't ignore the warning lights anymore.Mark
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Today's Featured Article - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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