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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 planning to put its fullsize pickups on a big diet, too

General Motors is just coming off a complete redesign of the Chevrolet Silverado and GMC Sierra for 2014, but in the US fullsize truck market, there is no rest for the weary. According to Reuters, plans are already unfurling for both trucks to drop pounds from their curb weight over the next few years, but this will unlikely be able to keep pace with the 700-pound diet targeted for the next-generation Ford F-150, a truck expected to debut late next year.
The biggest weight reduction for these trucks might not be available until the next full redesign, which will likely happen around 2019, but the article says that smaller updates could shave pounds in the meantime. Two examples given include an "aluminum-intensive" version of the Silverado that could shed 250 pounds and debut around the same time as the lighter-weight, aluminum-bodied 2015 Ford, and there is also talk of reducing weight for driveline components such as axles and driveshafts. These changes are all part of an attempt to meet strict new fuel economy standards coming in 2017, targets which will get even tougher in 2025.

GM invests $24 million to build more crew cab trucks in Fort Wayne

The full-size pickup truck arms race continues unabated here in the United States as Ford, General Motors and Fiat Chrysler battle back and forth for sales supremacy. The Ford F-Series of trucks continues to lead the field in sales (214,611 units sold through the first quarter of 2019), but the race for second place has been a lot more interesting to watch. That's because Ram, long a distant third in truck sales, eked its way past Chevrolet late in 2018 and has managed to hold the position so far in 2019. Don't take this to mean that sales of GM's trucks have been poor across the board. In fact, the automaker reports that sales of its four-door crew cab pickups are up 20 percent in 2019 over the same period a year ago. And that's what makes GM's announcement today so interesting. The automaker is investing $24 million into its assembly plant in Fort Wayne, Indiana to build more Chevy Silverado and GMC Sierra pickup trucks, and the focus will continue to be on crew cab models. "We are building Chevrolet and GMC crew cab pickups at record volume and mix levels to meet customer demand and the $24 million investment will allow us to build even more," said GM chief Mary Barra in a statement. "Crew cab sales have been very strong, and we are expanding customer choice with new models, more cab choices and innovative new powertrains." It's worth noting that, if crew cab sales are up 20% this year, but overall sales are down (over 15% for Silverado and around 2% for GMC), that means it's the cheaper regular cab and double cab models that are lagging. At the same time, sales of the midsize Chevy Colorado have surged 16%. And finally, if you combine sales of the Silverado and Sierra into one bucket, GM still has a comfortable lead over Ram overall. If there's a takeaway here, it's that trucks of all shapes and sizes have been, currently are and will surely remain hot in America, and automakers will continue to invest money into making sure they are able to satiate consumer demand.