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2021 GMC Canyon gets AT4 trim and a 'more upmarket' Denali

The AT4 train continues at GMC, with the 2021 Canyon AT4 climbing to altitude in Vail, Colorado, to announce its arrival. The off-road package, teased during the Sierra HD launch last year and already rolled out on the Sierra and Acadia, replaces the Canyon All Terrain trim. The rectangular grille goes away, the new rig picking up a larger, Sierra-like grille with a dark chrome surround and vertically-oriented fog lights. And because nothing says off-road badass like red recovery hooks, of course there's a pair peeking out from under the tweaked lower bumper. Otherwise, all the All Terrain kit carries over, like the tuned suspension with Advanced Hill Descent Control, transfer case skid plate, automatic locking rear differential, and 31-inch Goodyear Wrangler DuraTrac® tires on 17-inch aluminum wheels. Inside, the headrests are embroidered with AT4 logos, and Kalahari stitching is exclusive to this trim. GMC also announced a more polished Denali trim, without providing any photos. The coming pickup adopts a grille with a "more sculpted and layered pattern," plus five-inch chrome assist steps, and 20-inch Diamond Cut aluminum wheels that we'll assume come in a different pattern than the current 20-inch Diamond Cut aluminum wheels. The cabin goes upscale with open-pore ash wood trim and aluminum trim, a new Cocoa/Dark Atmosphere color theme, and unique stitching. Both the AT4 and Denali offer the same two engine choices. There's either the 3.6-liter V6 throwing out 308 horsepower and 275 pound-feet of torque, shifting through an eight-speed automatic, or the 2.8-liter Duramax diesel producing 181 hp and 369 lb-ft, shifting through a six-speed auto. The 2021 trucks will be available later this year, pricing to be announced closer to the on-sale date. The 2020 Canyon All Terrain starts at $37,695, the 2020 Canyon Denali starts at $41,595. Featured Gallery 2021 GMC Canyon AT4 View 11 Photos Related Gallery 2021 GMC Canyon AT4 View 11 Photos GMC Truck Luxury Off-Road Vehicles

'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).

GM will no longer remove parts from trucks to calculate curb weights

Following last week's mild uproar after it was discovered that Ford and General Motors were removing some optional parts from their pickups to lower the curb weight and consequently increase the maximum payload, GM has come out and committed to a base curb weight for its upcoming Chevrolet Colorado and GMC Canyon compact trucks (although it has yet to publish them) and its current Silverado and Sierra. The company will do the same for its heavy duty offerings, although those numbers have not been finalized yet.
"This will make our curb weight and payload specs more consistent with those of most other truck makers, making it easier for customers to compare vehicles," GM spokesman Tom Wilkinson told Autoblog in an emailed statement.
As GM notes - and as every manufacturer has noted since this story broke - customers still shouldn't take max payload ratings as gospel. Instead, they should refer to their truck's Tire and Load Label, like the one shown at the inset, which will offer detailed information on max payload, specific to their truck.