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I think the best part is that they can flatten out the torque curve by changing the fuel map so the car will pull stronger from down low. The guy tuning mine said that the factory leans out the fuel map at the bottom to pass the emissions test and protect the DMF and then add more to the top of the map.
It is interesting that other manufacturers increased power outputs on their diesels when they converted to Common Rail but Nissan just kept the same power outputs in the CRD as the Di. Why? Possibly to meet emissions? It really would be good to know what the engineers were thinking.
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