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Since 1994, GM diesel engines have used electronic engine controls to monitor and provide more precise diesel fuel injection. In the 16 years that have passed since then, diesel engine fuel injection strategies have advanced dramatically. This has enabled manufacturers to nearly double performance output and still reduce overall emissions. A whole new approach to diesel fuel injection was introduced by the first Duramax in 2001 (Ford had introduced electronic common rail diesel fuel injection before that, however the system required engine oil pressure to actuate the injectors. The fuel system used on the first Duramax was strictly electronically actuated and, as a result, far more precise). The Bosch common rail direct fuel injection system was new to the North American market at the time and provided speed and precision that had not previously been available. These factors, among others, allowed the Duramax engine to set the high-water mark for diesel engine power output. The 2001 Duramax engine rated at 300 HP and 520 foot-pounds of torque. Power output has increased incrementally to the current 365 HP and 660 foot-pounds of torque in the LMM Duramax...

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