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GM mulling off-road variants of fullsize SUVs

According to General Motors, owners "just love off-roading with [its fullsize body-on-frame sport utility vehicles]," namely the 2015 Chevrolet Tahoe and Suburban and GMC Yukon. If that's the case, it's a bit odd that sales of the previous generation of these models with the Z71 off-road package didn't sell particularly well.
Perhaps, considering this disconnect between owner's thoughts and desires with actual sales, it's not surprising that General Motors is reportedly "considering" an off-road specific model. That means the package would include styling changes and badges along with suspension modifications and larger wheels with appropriately sized fender flares.
There's no indication if the off-road model would be called Z71 or when it may potentially go on sale, assuming it ever goes on sale at all.

2016 GMC Sierra Denali Ultimate wants to take even more off the top

What do you do when getting to the top of Denali isn't enough? You create a higher peak called Denali Ultimate. That's what GMC has done with the 2016 Sierra, the new Sierra Denali Ultimate adding even more content and showing off the truck's refreshed face and new Denali grille. The reasoning behind this truck is perfectly sane. GMC says that in 2013 it had zero percent of the premium light-duty truck market; since that time, the brand says the segment (with an average transaction price beyond $55,000) has grown by a factor of ten, and the Sierra Denali has given GMC a 15.5-percent share. When it goes on sale in in the first quarter of next year, it can be optioned on the four-wheel drive 1500 Crew Cab with either the five-foot-eight or six-foot-six-inch bed. Standard equipment includes a sunroof, Lane Keep Assist, automatic headlights, Tri-Mode Power Steps, chrome tow hooks, and 22-inch wheels. The press release below has more. GMC Sierra Denali Ultimate: The Pinnacle of Premium Unique 22-inch wheels, expanded package of standard content drives exclusivity DETROIT, Tuesday, Nov. 17, 2015 – GMC is taking the range-topping style, craftsmanship and capability of the Sierra Denali even higher with the 2016 Sierra Denali Ultimate. It builds on the Sierra Denali's already class-leading attributes with a package of precision-crafted features designed to elevate its comfort, design and capability in the growing premium niche of the full-size truck market. GMC introduces the Sierra Denali Ultimate today, ahead of its public debut at the Los Angeles Auto Show. It goes on sale late in the first quarter of 2016. "The Sierra Denali has helped drive the growth of premium portion of the light-duty crew cab segment," said Duncan Aldred, vice president of GMC Sales and Marketing. "This truck is the ultimate expression of the Sierra Denali with greater emphasis on the bold and refined presence and advanced features that make Denali models synonymous with precision and exclusivity." Thanks in large part to Sierra Denali, which was redesigned in 2014, GMC commands 15.5 percent of the premium full-size truck segment, where average transaction prices exceed $55,000. The segment has nearly doubled in 2015 and grown tenfold since 2013, when GMC had zero percent of the market. In fact, Sierra Denali has helped GMC earn a higher share of the premium portion of the light-duty crew cab segment than of the overall full-size pickup segment.

'Killing a Duramax' Gale Banks YouTube series methodically tunes a diesel to death

Learning or perfecting a skill by watching YouTube videos is known as attending YouTube University. GM Authority picked up on one of the video site's more fascinating courses, hosted by Gale Banks; in a fair world, he should be referred to as Professor Banks when it comes to diesel engines and truck tuning. A few months after GM introduced the updated L5P 6.6-liter Duramax diesel V8 in the 2020 Chevrolet Silverado HD and GMC Sierra HD that ships with 454 horsepower and 910 pound-feet of torque, Banks decided he wanted to methodically tune the engine to death. The purpose of the resulting series, called "Killing a Duramax," is to push more power out of the engine in order to discover which parts break and when — or, as Banks puts it, force-feed the Duramax "until the crank hits the street and the heads hit the hood." With that knowledge, Banks can figure out all the weak points on his way to building what he calls a "Superturbo," that being a supercharged, twin-turbo race engine with more than 1,000 hp. What makes the series fascinating is Banks' knowledge, paired with the company's comprehensive iDash engine monitoring system that keeps tabs on a glut of parameters every step of the way. So for instance, you get Banks explaining the differences between inches of mercury and barometric pressure, how those are different from the water content of the air measured in grains, then showing those readouts on the iDash, then explaining in detail how they affect the air density in the Duramax system. The stock Borg-Warner variable turbo gets a lot of airtime — Banks accuses it of being "out to lunch" because he feels it's the weakest link on the engine. That turns into a turbo teardown and a deep explanation of performance pitfalls, such as when air pressure on the turbine begins to diverge from the boost pressure coming from the compressor. Banks says he can keep close tabs on where power's coming from, because the iDash monitors the horsepower contribution provided by the ambient air, the turbo, and the intercooler separately. The major changes so far are a stouter Precision 7675 turbo and TurboSmart wastegate (episode 5), a twin intake (episode 6), a custom liquid-cooled intercooler from a marine engine, a new GM oil cooler and synthetic oil (episode 10), and new injectors (episode 11).