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2023 Chevrolet Silverado HD reportedly getting mammoth torque

Chevrolet just gave the light-duty Silverado a significant round of updates. It hasn't detailed the changes it has in store for the heavy-duty model yet, but a recent report claims the truck will arrive with significant engine upgrades. Without citing sources, website TFL Truck reported that the current pickup's 6.6-liter Duramax turbodiesel V8 will return in the updated model. Its displacement won't increase, but its output will reportedly grow to 505 horsepower and a mammoth 1,085 pound-feet of torque. To put those figures into perspective, the 6.6-liter makes 445 horsepower and 910 pound-feet of twist in the 2022 Silverado HD; GMC's Sierra HD is available with it as well. Bumping the Duramax's output is a way to keep up with the competition. Arch nemesis Ford offers buyers who have extremely heavy things to tow 475 horsepower and 1,050 pound-feet of torque from a 6.7-liter turbodiesel V8. Over at Ram, the most powerful engine available in a heavy-duty truck posts numbers of 420 and 1,075, respectively. If the report is accurate, Chevrolet will enviably take the horsepower and the torque crowns in the segment. What remains to be seen is what effect the increases will have on the Silverado's towing capacity. As of writing, it's capable of towing up to 36,000 pounds (approximately 15 times the weight of a 2021 Mazda MX-5 Miata). Moving out of the engine bay, the 2023 Silverado HD will receive an updated exterior design that will again help differentiate it from the smaller, light-duty model. We're expecting the next round of updates will also bring new tech features, and it's reasonable to assume that the trim structure will evolve; Chevrolet might notably shift the HD in a more outdoorsy direction to satisfy a growing demand for off-road-focused trucks in the United States. None of this is official; Chevrolet is keeping its lips sealed about the updated Silverado HD. Full details will likely emerge in the coming months, and sales are tentatively scheduled to start in time for the 2023 model year.

2024 GMC Canyon AT4X AEV teased on 35-inch tires

Last month, Chevrolet Performance teased the 2024 Colorado ZR2 Bison, which will be the ultimate hardcore off-road variant for that model developed in collaboration with American Expeditionary Vehicles (AEV). Since that camouflaged preview appeared, we've welcomed debuts of the competition, the 2024 Ford Ranger Raptor and 2024 Toyota Tacoma TRD Pro. Bookending a solid month of 4x4 delights, GMC teased the coming 2024 Canyon AT4X AEV. We can look at this as the GMC version of the Colorado ZR2 Bison, the Canyon's new-for-2024 AT4X trim given an additional boost in spec and capability. This isn't the truck's first flirt with the public. During media drives for the 2024 Sierra HD AT4X, one of the new heavy duty rigs showed up to the site pulling a trailer bearing a covered pickup. The mid-size form factor, 35-inch tires, and appearance at a GMC event were clues enough to the pickup's identity.  The official preview is proof of what we've been expecting. The revised front fascia wears a high-clearance bumper. Don't expect that winch to be included; the red hook in the tease is a digital add-on. You can expect the winch opening, boron steel underbody skid plating, and Multimatic dampers. The standard AT4X got a three-inch lift over the non-hardcore Canyon variants, in part thanks to being fitted with 33-inch tires. The 35-inch Goodyear Wrangler Territory MT 315/70 17 tires on the AT4X AEV are thought to help provide 11 inches of ground clearance. Beefier wishbones and hydraulic bump stops help protect owners who want to test limits. Reports by folks who walked around the covered truck predict a set of beadlock-capable AEV Salta wheels like the kind sold with the full-size Sierra AT4X AEV Edition. The cover couldn't hide the sport rack in the bed nor the bed-mounted spare tire carrier. Those, like the winch, are likely options that add to the price. Don't be surprised if engine output is unchanged. The 2.7-liter H.O. turbocharged four-cylinder makes 310 horsepower and 430-pound feet of torque. We'll never complain about more, but that's plenty for a truck envisioned as a low-speed obstacle crosser.  All GMC is saying for now is, "An even more off-road capable Canyon is coming." It debuts on July 6. Related video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.

'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).