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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).

GM recalls nearly 340,000 large SUVs to fix daytime running lights

General Motors has initiated a recall campaign for more than 338,000 of its large SUVs to address a potential defect in the onboard computer software that controls the daytime running lights. In some cases, the DRLs may remain on even when the headlights are enabled, which creates additional glare for oncoming drivers at night and fails to comply with federal regulations for headlight performance.  "GM determined that the body control module (BCM) software in these vehicles, under a combination of certain pre-conditions, may fail to deactivate the DRLs when the headlamps are on," GM's recall report said. "A regulatory assessment was conducted to evaluate whether the condition presented a potential noncompliance with the DRL activation requirements in S7.10.5, Table I-a. of FMVSS 108. On October 27, 2022, GM’s Safety Field Action Decision Authority (SFADA) decided to conduct a recall for potential noncompliance with this standard." GM says the recall covers the 2021 model year GMC Yukon and Yukon XL, 2021 Chevrolet Tahoe and Suburban, and 2021 Cadillac Escalade and Escalade ESV. The company says all models produced within that operating window include the improperly programmed body control module, meaning all vehicles within the recall population may exhibit the problem. The issue was discovered by a GM engineer during validation testing in August, prompting a deeper investigation and eventually leading to the recall itself.   The module's software can be updated by GM dealers, so it should be a quick fix for customers. Notifications will be mailed to owners in December.  Related video: Recalls Cadillac Chevrolet GMC Ownership Safety SUV Luxury

The cars and trucks of 'Transformers: Rise of the Beasts'

The latest spectacle in the Transformers franchise is about to hit the theaters. The final trailer was released, giving us peeks at what appears to be a pretty boilerplate story about the end of the world. There's some kind of ancient interplanetary war brewing and it's up to some teenagers to sort it out with the help of their robot buddies. But this is Autoblog, so we're not even going to try to suss out a plot so thin it won't hold a spittle globule's worth of water. We'll just go over the cars. Transformers: Rise of the Beasts | Official Final Trailer (2023 Movie) Porsche 911 Carrera RS 3.8: Mirage So far the star of the film, car-wise, looks to be a blue-on-silver 964 Porsche named Mirage that is voiced by Pete Davidson. It's been the most promoted of the movie cars, even more so than formerly central characters like Bumblebee and Optimus Prime. Except, this isn't just any ordinary 911; it's a Carrera RS 3.8, a European-exclusive model of which Porsche only built 55 units. As the name implies, it came with a bored-out M64 turbo flat-six as opposed to the 964 Turbo's 3.6. It wore the Turbo's wide-body badonk with a bi-level rear wing, but Porsche reportedly stripped out 570 pounds' worth of weight despite embiggening key performance parts like brakes and wheels. Fortunately, no actual RS 3.8s were used in the movie. Producers instead built five cars for different purposes — shooting closeups of actors, jumps, the obligatory driving backwards real fast — out of lesser 911s. However, the sound department did record the engine note of an actual RS 3.8 for accuracy, as the higher crank speeds of the 3.8 have a distinctive sound.  In the original 1984 Transformers lineup Mirage was a Ligier JS11 Formula 1 car, complete with faux Gitanes cigarette branding (on a children's toy!). An F1 racer would raise an eyebrow on the streets, so it made sense to update to a street-legal sports car. If you're wondering why this Porsche isn't the character Jazz, whose original vehicle mode was an ultra-cool Martini-liveried Porsche 935, well, he was remade into a Pontiac Solstice voiced by Darius McCrary during the GM product placement rewrite in 2007's Transformers reboot, then unceremoniously killed. 1977 Chevrolet Camaro: Bumblebee Formerly the franchise star, Bumblebee gets far less screen time in the trailers. He's still a Camaro, but because Transformers: Rise of the Beasts takes place in 1994 he's not a fith-gen.