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 - Grain Threshing in the Early 40's - by Pat Browning. The setting is rural Wisconsin, halfway between East Troy and Elkhorn, on Hodunk Road, our nation was at war, and I was 6, 7 and 8 years old. George was our "threshing neighbor." He was the one with the threshing machine, a JI Case on steel wheels, and he pulled it to our farm with a JI Case standard tractor also on steel. In those days, steel wheeled implements were common. The roads were general gravel, so the lugs cutting into them wasn't a problem. George would set up the thresher, s
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