Stopping from 70 mph required 221 feet-and maybe an anchor. The quarter-mile time also dropped, to 16.2 seconds at 86 mph, compared with 16.8 seconds for the old truck and 16.6 for the gas ’11 F-350.
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It was also 0.5 second better than a gasoline F-350 we tested-which weighed about 620 fewer pounds-and 0.4 quicker than our long-term heavy-duty Ram diesel. Bending the scales at a hefty 7960 pounds, the truck scooted to 60 mph in eight seconds flat, an improvement of 0.7 second over the outgoing model. We first tested the 2011 Super Duty prior to the reflash, setting an F-250 loose on the test track, where it put down some impressive figures. Not one to lose a pissing match, Ford squeezed out another 10 hp and 65 lb-ft with a simple engine-computer reflash, for respective totals of 400 and 800. The end result of the new tech was 390 hp and an asphalt-destroying 735 lb-ft of torque, but then the 2011 Chevy Silverado and GMC Sierra debuted with a new Duramax diesel that trumped the Ford with 397 hp and 765 lb-ft. Air now enters the engine on the outsides of the heads, and the exhaust manifolds are in the engine valley, joined by a single turbocharger. They also reversed the normal intake and exhaust flow by essentially flipping the aluminum heads around. Ditching the old cast-iron block, engineers opted to use a new compacted graphite iron material to save weight.
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After Ford’s relationship with Navistar-its previous diesel-engine supplier-went south, the blue-oval team brought the task of designing, engineering, and building the Power Stroke in-house.
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On a diesel kick since welcoming a Ram 2500 diesel into our long-term fleet, we were eager to see how the Power Stroke would stack up.īefore we get into the nitty-gritty of our experience with the F-250, let’s take a closer look at that brute under its hood. But you can’t haul that kind of mass without some serious firepower, and the diesel powertrains from GM, Ford, and Dodge have started an all-out torque war in the Motor City.ĭearborn’s newest piece of artillery in this battle is the all-new, Ford-designed and -built, 6.7-liter Power Stroke diesel V-8, available in the redesigned 2011 F-series Super Duty lineup. That’s how we’ve arrived at trucks with four-ton curb weights, three-ton payload capacities, and 12-ton towing capabilities. In the heavy-duty-truck world, manufacturers and owners live by one rule: Bigger is better.