Yeah I talked to my instructor last week and basically what he told me is that they pre-program an intentional overfueling when you mash the gas before the engine is at operating temp for two reasons.
First to help with faster catalitic converter light-off, and also to give a margin of safety to prevent underfueling when switching to the new higher load % fuel map. Basically that means injecting more fuel before retarding injector timing to help prevent detonation. (because the injector timing is what helps prevent detonation in a diesel). If there is anything else that you need to know about turbo systems or diesels feel free to ask
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