In keeping with its tradition of being a premier competitor in sports-car endurance racing, Porsche AG ups the power and fuel economy of its RS Spyder prototype with the introduction of direct-gasoline injection. Competing in the American Le Mans Series’ LMP2 class, which features smaller and less-powerful cars than LMP1 prototypes such as the V-12 turbodiesel Audi R10 TDI, the factory-backed Penske Racing RS Spyders are powered by 3.4L DOHC V-8s. With the addition of DGI, Porsche says, ...

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