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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 to squeeze out more production capacity for midsize trucks

General Motors was predicting a strong showing for the Chevrolet Colorado and GMC Canyon before they debuted, and demand among dealers for the midsize trucks even exceeded company's expectations. The positive situation has left GM with a problem, though: finding ways to increase capacity for the pickups at the Wentzville Assembly plant in Missiouri. With a third shift already running, GM has continued to look for ways to build just a few more of the trucks at the plant. The company has plans to hire as many as 1,000 more workers for the Saturday and Sunday shifts to construct an additional 2,000 pickups a month, according to unnamed insiders at the factory speaking to Automotive News. The little adjustments even extend to getting rid of an unpaid break to add 18 minute of assembly time over the course of a day, which equals about 3,500 more vehicles a year. All of this effort comes because the trucks are in such high demand. According to GM's figures, the company has delivered a combined 35,720 units of the Colorado and Canyon from January through April 2015, and the Chevy was the fastest-selling truck in the US for the previous three months. In May, it spent an average of just 12 days in showrooms before being snapped up. And even better for the company, 43 percent of these buyers came from other brands. According to Automotive News, the most popular trade-ins have included the Ford F-150, Toyota Tacoma, and Dodge Dakota. Related Video:

Chevrolet Malibu gets aggressive redesign for 2016

Cars like the Ford Fusion, Kia Optima and Chrysler 200 have recently raised the styling bar in the midsize sedan game is. In that regard, the rather anonymous Chevrolet Malibu has suffered in recent years. That no longer appears to be an issue with the 2016 Malibu, which is simply caked with interesting elements. The wide, aggressive grille, expressive headlights and angled LED running lamps make the Malibu look like the Impala's much angrier little brother. In back, the Impala inspiration is there, but like the fascia, it's noticeably more aggressive, with a sharper cant to the taillights and a pair of large, integrated dual exhausts (at least on the 2.0-liter, turbocharged model being featured by Chevy). Designers also worked to give the 'Bu a bit more character in the profile, adding a pair of character lines to cut back on the last-gen car's slab-sided looks. While the exterior could almost be described as sporting, the brown-and-beige color scheme in the cabin is noticeably more relaxed. A large, central MyLink system sits atop the dash, while drivers will also have access to a dedicated display in the instrument cluster. A thick-rimmed, three-spoke steering wheel is a bit on the large side, but still looks like a nice piece to work. You can read a lot more about the new 2016 Malibu in our original post from early this morning. But before you do that, have a look at our full gallery of live images from the floor of the Javits Center. All-New Malibu is Larger, More Technological and Efficient New hybrid sedan projected to offer combined rating north of 45 MPG DETROIT – Chevrolet today introduced the all-new 2016 Malibu – a completely restyled midsize sedan engineered to offer more efficiency, connectivity and advanced safety features than ever. An all-new hybrid powertrain, which leverages technology from the Chevrolet Volt, will help offer a GM-estimated combined rating north of 45 mpg. The Malibu's standard 1.5L turbo powertrain is projected to offer 37 mpg highway. The 2016 Malibu is also longer and lighter, with more interior space and improved fuel efficiency. Its wheelbase has been stretched close to four inches (101 mm), and it is nearly 300 pounds (136 kg) lighter than the current model. "Midsize customers tell us they want great fuel economy, connected technologies, wrapped in a gorgeous exterior. This is exactly what the 2016 Malibu was engineered to do," said Jesse Ortega, Malibu chief engineer.