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'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).

General Motors reportedly considering small electric pickup

General Motors is considering adding a small entry-level model to its range of electric pickups, according to a recent report. The carmaker is currently showing a prototype to a select group of customers to gather feedback about the model before executives decide its fate. Industry trade journal Automotive News claims that it saw the pickup during a workshop organized by General Motors and describes it as being "smaller than the Ford Maverick and the Hyundai Santa Cruz." For context, the Maverick stretches about 200 inches long, 73 inches wide, and 69 inches tall, so it's around 12 inches shorter, 11 inches narrower, and 10 inches lower than the recently-unveiled Chevrolet Colorado. It sounds like this little GM truck would be closer in size to the Brazilian-market Chevy Montana, pictured at top. But unlike the Montana, the model that Automotive News got a look at had two doors, a "low roofline," a four- to four-and-a-half-foot cargo box, and a design described as futuristic and sporty. If launched, the yet-unnamed pickup would be marketed as an "affordable" EV with a base price pegged under $30,000. However, that's a big if: the pickup — whose name hasn't been announced — hasn't been approved for production. "We're creating these to get a reaction and then to try to modify it or move on," Michael Pevovar, the director affordable EV and crossover design for Chevrolet, told the publication. "The input may come back that it's just too small, and that's okay," he added. If it turns out to be too small for buyers, General Motors hasn't ruled out building its entry-level electric pickup on a different architecture to make it a little bigger. It's too early to tell where the electric pickup would slot in the General Motors portfolio if executives approve it. Chevrolet immediately comes to mind, especially considering the sub-$30,000 price point. The model would make more sense with a bowtie on its front end than with a Cadillac emblem, GMC's trucks are normally positioned higher than Chevrolet's, and Buick hasn't built a pickup in many decades. Similarly, there's no word on when it would enter production or where it would be built. With that being said, there's very clearly a market for affordable, small pickup trucks. As of the third quarter of last year, Ford had sold more Mavericks than it had the Expedition or the Ranger. Hyundai hasn't sold as many Santa Cruz trucks, but it's still not too shabby, having beaten out the Venue and Accent last year.

One-off 2022 GMC Jimmy shows the convertible SUV that could have been

GMC is seemingly content to let the sixth-generation Ford Bronco take on the Jeep Wrangler on its own. The company left this segment of the market decades ago, but an Arkansas-based builder named Flat Out Autos is bringing the Jimmy back for the 2022 SEMA show. The modern-day Jimmy largely mirrors the Sierra 1500 that it's based on from the tip of the front bumper to the b-pillars. Beyond that, Flat Out Autos added redesigned quarter panels, removed the partition between the cargo box and the cabin, and installed rear seats. It also developed a removable, body-colored hardtop that brings the truck's silhouette in line with the second-generation Jimmy's. Out back, the versatile MultiPro tailgate remains, and the Jimmy keeps the Sierra's rear bumper with a step integrated into each corner. All told, the conversion looks surprisingly good. We bet GMC could sell a lot of these if it decided to jump back into the segment. The interior is mostly Sierra fare, though the front seats tilt forward and carpet lines the cargo box and the inner part of the tailgate. Flat Out Autos hasn't released technical details, so there's no word on what the Jimmy is powered by. More details will presumably be announced in the weeks leading up to the 2022 SEMA show, which opens on November 1, and Flat Out Autos plans to build 25 units.