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Leak reveals GM's 2017 heavy duty diesel trucks to get 910 lb-ft of torque [UPDATE]

UPDATE: Chevrolet officially announced specs for the 2017 Silverado HD and the rumors were true. The truck's new Duramax 6.6-liter turbo-diesel V8 puts out 445 horsepower and 910 pound-feet of torque. Chevrolet says the new motor produces 19 percent more torque and 12 percent more horsepower, while producing 35 percent fewer emissions. Overall, the new engine is a big improvement over the current motor, which generates 397 horsepower and 765 pound-feet of torque. According to Truck Trend, GM's newest heavy duty pickup trucks will pick up quite a bit more power and torque. The publication spotted a recent GM Powertrain ordering catalog that had the engine specs for the 2017 model year and managed to get some screenshots before the catalog was taken down, and they can be viewed here. The screenshots revealed that the 6.6-liter turbodiesel V8 powering the Silverado and Sierra heavy duty models will boast 445 horsepower and 910 lb-ft of torque. This is a substantial gain over the current models' 397 horsepower and 765 lb-ft of torque, and as Truck Trend points out, it exceeds the Ford Super Duty line's horsepower output of 440, but comes short of the 925 lb-ft rating. Truck Trend credits part of this output gain to the new intake system GM will introduce on the 2017 heavy duties. The intake gets 60 percent of its air from a scoop on the hood, with the other 40 percent coming from behind one of the front fenders. GM doesn't reveal horsepower figures in the press release about the scoop, but it does say the cooler air helps with maintaining the engine's output, and that the scoop does produce a ram-air affect, providing more air at speed. As we know, more air plus more fuel equals more power, but there's likely more to the power increase in this engine than only the intake. Related Video: News Source: Truck Trend via MSN Chevrolet GM GMC Truck Diesel Vehicles

Why an independent rear suspension for GM's new, full-sized SUVs wasn't easy

A Motor Trend report last month laid out how Cadillac's 4.2-lier twin-turbo Blackwing V8 could be an orphan due to cost concerns in the GM empire. Last-minute chassis changes to Cadillac's new sedans and XT6 crossover led to engine bays that couldn't fit the Blackwing. On the SUV side, according to the report, the new independent rear suspension for big people haulers cost so much to implement that GM ruled out reworking the Escalade to accept the Blackwing. At least one commenter rightly asked how could a suspension swallow that much money. A new piece in Motor Trend has the answer. The excellent Alissa Priddle spoke to Tim Herrick, GM's executive chief engineer for full-size trucks, about why the clean-sheet IRS cost "multimillions of dollars."  First, GM would need to build a new body shop at the Arlington, Texas plant that assembles the automaker's big SUVs to stamp the numerous wholly new parts and panels accommodating an IRS. Then GM would need to design and pay for a new assembly process. On top of those up-front costs, there was the incremental cost of the four-link IRS components being more expensive than those in the trucks' former leaf-sprung solid axles. Herrick endured so many rejections for so long that he remembers the date and time when he got approval for the new unit. He said it came down to a meeting where he told a higher-up, "I'll make you a deal: If we get to the reveal, or if we launch this and you think this was a dumb idea, I'll hand you my badge and let you walk me out." Head to Motor Trend to read the full story. Based on Herrick being on stage to help present the new SUVs to the press, and on our First Ride in the new Chevrolet Tahoe and Suburban at GM's Milford Proving Grounds, it appears this will have a happy ending for all involved. Furthermore, since Herrick worked on the T1 platform that supports the big SUVs as well as the light- and heavy-duty pickups, he understood the demands on the commercial side, too. That could be why when Roadshow asked Tim Asoklis, chief engineer of the Tahoe and Suburban, if the new IRS could endure life in the Chevrolet Silverado and GMC Sierra, Asoklis answered, "Oh, absolutely." Related Video:    

Sunday Drive: Subaru Ascends up to the hottest market segment in America

Utility vehicles – in other words, crossovers and SUVs – are so hot right now. Two of our top stories from last week revolve around the utilitarian vehicle, but besides their jacked-up, five-door bodystyles, they couldn't be more different. The 2019 Subaru Ascent is headed into an extremely crowded and competitive segment, where it'll have to go up against industry stalwarts like the Toyota Highlander and Honda Pilot, not to mention upstart contenders like the Volkswagen Atlas. The Mercedes-AMG G63, on the other hand, has very little competition – there simply aren't very many ultra-luxurious, off-road-ready SUVs in the world vying to attract the dollars of the wellest-to-do customers across these United States. Moving on from crossovers and SUVs, our readers remain attracted to classic front-engine, rear-wheel-drive sportscars. The Toyota Supra's upcoming rebirth earns two places on our list of stories worth highlighting from the week that was; one with leaked information from a Japanese magazine, and another with rumors indicating that maybe we shouldn't be quite so excited. And finally, there's the strange case of the long-lost 2009 Chevy Corvette Z06 that one lucky individual happened to find squirreled away in a storage container with just 720 original miles. A high-horsepower head scratcher if we've ever seen one. As always, stay tuned to Autoblog this week for all the latest automotive news that's fit to print. 2019 Subaru Ascent vs Honda Pilot vs Toyota Highlander: How they compare on paper 2019 Mercedes-AMG G63 set to bare its 577-horsepower heart in Geneva Toyota Supra leaks in Japanese magazine ahead of Geneva debut Toyota Supra to be little more than a rebodied BMW Z4? Forgotten 720-mile 2009 Corvette Z06 emerges from storage Chevrolet Mercedes-Benz Subaru Toyota Coupe Crossover SUV Luxury Off-Road Vehicles Performance barn find sunday drive subaru ascent mercedes-amg g63