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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).

Malcolm Butler gets the MVP's Chevy Colorado

In the wake of the Super Bowl last week, we reported that New England Patriots quarterback Tom Brady intended to give the Chevy Colorado awarded to him as the game's most valuable player to Malcolm Butler instead. In our informal poll (to say nothing of the hundred-plus comments that ensued), an overwhelming 86.7 percent of you, our loyal readers, agreed that it was the right thing to do. And now that's precisely what's happened. "After consulting Super Bowl MVP Tom Brady," the automaker said in the press release below, "Chevrolet presented an all-new Colorado pickup to New England Patriots cornerback Malcolm Butler." The rookie, as you may have seen in between the commercials, made the game-saving interception that handed his team the victory, propelling Butler to stardom. "I am ecstatic that Chevrolet has chosen to reward me with a Colorado," said Butler upon taking delivery of his new red pickup. "It is just another unreal event in what has been an incredible week." We can only imagine. Enjoy the truck, Malcolm; you've earned it. Related Video: Upon Further Review, Chevrolet Awards Super Bowl MVP Colorado to Malcolm Butler 2015-02-10 DETROIT – After consulting Super Bowl MVP Tom Brady, Chevrolet presented an all-new Colorado pickup to New England Patriots cornerback Malcolm Butler, whose end zone interception preserved the Patriots' victory in Super Bowl XLIX. The Colorado was intended to be awarded to Brady, the Patriots' quarterback, in recognition of his Super Bowl Most Valuable Player award. However, Brady and Chevrolet huddled on Monday and Chevrolet determined Butler deserved recognition for his game-saving interception. "I've seen several game-changing moments in big games, and Malcom's interception last Sunday ranks up there as one of the biggest," said Brady. "I appreciate Chevrolet wanting to honor the Super Bowl's top performer, and I'm glad they have agreed to award the Colorado to Malcolm." Said Butler: "I am ecstatic that Chevrolet has chosen to reward me with a Colorado. It is just another unreal event in what has been an incredible week." The Chevrolet Colorado, 2015 Motor Trend Truck of the Year®, was engineered to be the most capable, most versatile and most technologically advanced midsize truck in the market. With class-leading horsepower and fuel economy along with a 4G LTE built-in Wi-Fi hotspot, the Colorado adds a new dimension to the Chevy truck line.

How GM engineers are using diaper 'snow' to keep you warm

Testing how snow affects General Motors' vehicles isn't really a problem right now for the company's engineers, but in the dog days of summer the process isn't exactly easy. The only real option is for them to book time at the automaker's climatic wind tunnel. However, a flash of brilliance from an engineer allows snow to be simulated regardless of the temperature outside, and the discovery is all because of his daughter's wet diaper. The realization came to GM Thermal Systems engineer Nicholas Jahn while he was swimming with his daughter and noticed how her diaper ballooned in size in the water. He found out the substance that makes this possible is called sodium polyacrylate. When the material gets wet it grows and forms fluffy flakes that are a close imitation of snow. Best of all, the stuff can be prepared easily any time of the year, and it's reusable. The engineering team uses the material to test the effectiveness of the heating systems of GM's vehicles. They spread the sodium polyacrylate over the inlets at the base of the windshield to obstruct the airflow and then crank the heater. After some time, they can see how much is being sucked into the system and design more efficient systems in the future. See how the process works in the video above and read about the diaper discovery in GM's press release below. Diapers Change Chevy Cruze Winter Warm-up Time GM validation engineer uses diaper material "snow" to reduce frigid drives 2015-01-06 DETROIT – An item commonly found on an infant's changing table is helping General Motors' engineers simulate snow year round, ensuring heating systems in cars like the 2015 Chevrolet Cruze can quickly and efficiently warm its interior. Packed snow can prevent air from entering the inlet panel at the bottom of the windshield, obstructing the flow of air into the heating system and reducing the amount of air it can push out. This can lead to less efficient warming of the car's interior and windshield defrosting. "The last thing anyone wants to do when it's freezing cold out is scrape their windshield," said Nicholas Jahn, GM Vehicle Thermal Systems engineer. "The testing we perform on the Chevrolet Cruze with the diaper material allows us to maximize the car's heating capabilities." Ironically, Jahn stumbled upon his diaper-based testing method in the middle of summer. During a swim with his daughter, he noticed her diaper multiplied in size when it came into contact with water.