|new 6.6L L5P Duramax turbo-diesel V-8 engine|
The new 6.6L L5P Duramax turbo-diesel V-8 engine will pump out 445 horses and 910 pound-feet of torque! That’s a 19% increase in max torque over the outgoing Duramax 6.6L! Along with greater torque and more horsepower, the redesigned turbo-diesel Duramax engine is also much quieter. In fact, engine noise, at idle, is reduced 38%.
The impressive power of the new Duramax engine wouldn’t be possible without the proper amount of air intake. The engineers at GMC have created a new, patent-pending vehicle air intake system that drives cool, dry air into the engine for sustained performance. Cooler air helps the engine run better, especially in conditions where engine and transmission temperatures can rise quickly. That allows the Duramax to maintain more power and vehicle speed when trailering in the toughest conditions.
The new intake design is distinguished on the 2017 GMC Sierra HD, by a bold hood scoop, and is another example of the advanced integration included in the 2017 Sierra HD that makes it over-the-road capable.
|2017 GMC Sierra Denali 2500 HD|
A new, smart diesel exhaust-brake feature enhances control when descending steep grades. The integrated exhaust-brake system makes trailering less stressful by creating additional backpressure in the exhaust, resulting in negative torque during deceleration and downhill driving, enhancing driver control and prolonging brake pad life. A new electronically controlled, variable-vane turbocharger helps the engine make more power, and revisions to enhance the capability of the exhaust-brake system.
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