Kyle said "the diesel doesn't get ANY benefit from extra air unless you also add more fuel."

I don't claim to have any great knowledge, especially when it comes to diesel, but this just doesn't make sense. If this was the case then there would be minimal benefit from a turbo. A turbo obivously benefits a diesel greatly in mileage and output. According to the Chilton book, a turbo can ram up to 3.5 times the air into a cylinder as a naturally aspirated engine. At the same time fuel mileage is increased not decreased. So signignantly disporportionate amounts of air into the chamber increase volumetric efficiency. This is the bueaty of a diesel in that you are not limited by the lean-ness of the mix as in petrol. Again I don't claim to know but I doubt that when a turbo doubles the air intake that the fuel pump output doubles as well.
If im wrong set me straight. I joined this group so I can learn.
Eric Z