2014 Gmc Acadia Slt-2 on 2040-cars

Auto blog

'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).

GMC shows how the 2022 Hummer could have looked even more futuristic

Excitement filled the room when GMC asked its designers to resurrect the Hummer in April 2019, but a tinge of uneasiness permeated the department after executives locked in an early 2020 unveiling date. Luckily, stylists knew what they wanted early on in the development phase, and preliminary design sketches give us a fascinating look at how they shaped the electric off-roader that ended up making its global debut online in October 2020. Hummer, the brand, unceremoniously shut down in 2010 after General Motors failed to sell it to the Chinese, but its design DNA was so strong that stylists were able to pick up where their predecessors left off. All of the sketches published on Instagram by the official General Motors Design account show a boxy truck with a tall front end, a short windshield, and a generous amount of ground clearance. These styling cues trace their roots to the AM General Humvee that entered production in 1984 and made its combat debut when the United States invaded Panama in 1989. Even the wildest drawings still depict a pickup that's immediately recognizable as a Hummer. Most of the early design sketches wear some variation of the seven-slot grille that characterized Hummer's production models; it's a styling cue that hints at a heritage shared with Jeep under the American Motors Corporation (AMC) umbrella. Oddly, none wear the round headlights seen on the H2, the H3, and the HX concept that nearly became the H4. Was GMC afraid that its Hummer would end up looking too much like a Jeep? And, at least one sketch shows a fold-down windshield, a feature that will not make it to the assembly line. Sketches never reach production without modifications made in the name of packaging and safety concerns, and the Hummer is no exception, but stylists did a good job of reinventing the brand's design language without copying or erasing the past. If the company had stuck around long enough to make a second- and a third-generation H2, odds are it would look a lot like the GMC-branded model that will enter production in a year. GMC remains on track to start 2022 Hummer deliveries in late 2021, though it told Green Car Reports that it still hasn't built a fully functional prototype yet. When it arrives, this outdoorsy pickup will land in a burgeoning segment of the truck market that numerous models (including the Rivian R1T and Ford's electric F-150) will also call home.

GMC Canyon Denali Interior Review: THE luxury midsize truck

Over the past couple of years, GMC has been getting serious about being more than just a rebrand of Chevy trucks and SUVs. The same goes for the luxury Denali line. Among the beneficiaries of this push for differentiation is the latest Canyon. On top of only being available with the wide-track layout and the most powerful engines, it gets a Denali trim that is unequivocally the most luxurious midsize truck in the segment. The GMC Canyon Denali could even be described as a luxury midsize truck, of which there are no others. And it all comes down to what GMC has done with the interior. Open the door, and the upgrades are immediately obvious. There's leather everywhere. It's on the dash, the door panels, center console and doors. And it has nice details with the perforation and quilted stitching. The seatbacks get embroidered Denali logos and contrasting leather panels, too. The feel is more rugged than supple, but it is a truck after all, and the materials feel like they'll wear nicely.  Then you notice the wood trim. The real wood trim. It's subtle, just adorning a strip along the top of the dash and the front door panels, but the light brown color stands out against the black leather and plastic elsewhere. It's got a natural, open-pore finish that highlights the material, and the strip in the dash gets extra laser-cut details. The branding consisting of DENALI, some stylish strakes and the coordinates of Denali, the mountain, are crisp and clear. Throw in plenty of shiny chrome, and the same quality-feeling buttons and knobs (the knurling details on the knobs are particularly nice), and just on trimmings alone, it's obvious the Denali is the most plush little truck. The seats themselves are solid, though not particularly exceptional. The front seats are a bit flat, but they're also very roomy. On the Denali, the driver's seat has eight-way power adjustability with memory, and the passenger has six-way power adjustability. Heating and ventilation are included, too. Leg, head and shoulder room are also all excellent up front. The rear seat, like the rest of the segment, has enough room for adults, though legroom is a tad tight, with knees likely brushing the front seat backs. The seat bases in the rear are split with storage underneath, although it's not particularly useful. Besides its meager volume and awkward shape, much of it is taken up with the jack.