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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).

Zombie cars: A dozen discontinued vehicles people still buy new

Car models come and go, but as revealed by monthly sales data, once a car is discontinued, it doesn't just disappear instantly. And in the case of some models, vanishing into obscurity can be a slow, tedious process. That's the case with the 12 cars we have here. All of them have been discontinued, but car companies keep racking up "new" sales with them. There are actually more discontinued cars that are still registering new sales than what we decided to include here. We kept this list to the oldest or otherwise most interesting vehicles still being sold as new, including a supercar. We'll run the list in alphabetical order, starting with *drumroll* ... BMW 6 Series: 55 total sales BMW quietly removed the 6 Series from the U.S. market during the 2019 model year. It had been available in three configurations, a hardtop coupe, a convertible and a sleek four-door coupe-like shape.   BMW i8: 18 total sales We've always had a soft spot for the BMW i8, despite the fact that it never quite fit into a particular category. It was sporty, but nowhere near as fast as similarly-priced competitors. It looked very high-tech and boasted a unique carbon fiber chassis design and a plug-in hybrid powertrain, but wasn't really designed for maximum efficiency or maximum performance. Still, the in-betweener was very cool to look at and drive, and 18 buyers took one home over the course of 2021.   Chevy Impala: 750 total sales The Impala represented classic American tastes at a time when American tastes were shifting away from soft-riding sedans with big interior room and trunk space and into higher-riding crossovers. A total of 750 sales were inked last year.   Chrysler 200: 15 total sales The Chrysler 200 was actually a pretty nice sedan, with good looks and decent driving dynamics let down by a lack of roominess, particularly in the back seat. Of course, as we said regarding the Chevy Impala, the number of Americans in the market for sedans is rapidly winding down, and other automakers are following Chrysler's footsteps in canceling their slow-selling four-doors. Even if Chrysler never really found its footing in the ultra-competitive midsize sedan segment, apparently dealerships have a few leftover 2017 200s floating around. And for some reason, 15 buyers decided to sign the dotted line to take one of these aging sedans home last year.

Weekly Recap: Racing legend Jim Hall explains Chevy's futuristic Chaparral concept

"I said our cars are built to be winners." – Jim Hall Racing legend Jim Hall never thought he'd be a video game consultant, but when Chevrolet asked for his advice to create a futuristic Chaparral for the Vision Gran Turismo series, he was eager to help. He reviewed early sketches and suggested some changes that made it onto the concept, including the addition of a camera that's mounted onto a mast over the cabin to aid the driver. The Chevy Chaparral 2X Vision Gran Turismo concept was revealed this week at the Los Angeles Auto Show and will be part of a downloadable update for PlayStation 3's Gran Turismo 6 in December. Theoretically, at least, it uses a laser-beam propulsion system and an air-powered generator to produce 900 horsepower in the video game. It's capable of sprinting to 60 miles per hour in 1.5 seconds en route to a top speed of 240 mph. Those gaudy performance specs – even in the virtual world – came at Hall's urging. "I said our cars are built to be winners," Hall told Autoblog on the floor of the Los Angeles show. The 79-year-old drove Lotus racecars in Formula One before launching the successful Chaparral Cars in the 1960s. Like his innovative Can-Am racers, the Vision Gran Turismo project has an eye toward the future. It also introduces the iconic Chaparral name to a new generation of fans, and hopefully, Hall says, gets them excited about engineering and design. "It emulates what we did in the '60s," he said. And what they did back then still resonates. Chaparral Racing and Chevy partnered more than 45 years ago for development work on the composite monocoque chassis, lightweight alloy powertrains, automatic gearboxes and active aerodynamics. "He [Hall] walked right back into this and was able to apply thinkings and learnings," said Clay Dean, General Motors executive director of advanced design. The Chevy Chaparral 2X Vision Gran Turismo concept was created at GM's North Hollywood advanced design studio, and it will be on display at the show through November. Other News and Views Sebastian Vettel joins Ferrari team in 2015 Ferrari confirmed that four-time Formula One World Champion Sebastian Vettel will join the Scuderia for the 2015 season, jettisoning Ferrari's current ace, two-time champ Fernando Alonso. Vettel has been F1's most successful driver since Michael Schumacher, though he's struggled to match his previous accomplishments in 2014.