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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 releases full Super Bowl ad with GMC Hummer, Cadillac Lyriq: Take that, Norway!

GM just dropped its big Super Bowl ad, and it’s a good one. Will Ferrell, Kenan Thompson and Awkwafina all star in the 90-second ad titled “No Way, Norway.” The point of the ad is to get Americans hyped up about the upcoming electric vehicle range on its way from GM. Both the Cadillac Lyriq and GMC Hummer EV star throughout, but itÂ’s less about the vehicles, and more about changing attitudes about EVs in general. Ferrell comes after Norway aggressively, but in a playful and competitive way about how many electric cars sell in the Scandinavian country. Over half of all new car sales in Norway are of EVs, whereas GMÂ’s data show that just 4% of new cars sold in the U.S. are electric. Massive financial incentives from the Norwegian government can take much of the credit for why EVs sell at such high rates over there. However, GM thinks it can still rally the U.S. to get more excited about buying EVs once its fleet of cars using the companyÂ’s Ultium battery tech comes online. The ad is done with classic Ferrell comedy, and it sure did elicit some chuckles from us. It also follows the same “Everybody In” philosophy that GM announced back when it changed up the logo a short time ago. GM is inviting folks to strap in for the onslaught of EVs coming their way (for now, you can buy a Bolt). President BidenÂ’s administration has voiced support for a number of policies and actions to take for greater adoption of electric cars in the U.S. — we also know the federal government intends to transition its full fleet of vehicles to EVs. It's still unlikely that we make it to Norway's rate of electric car sales in the immediate future, but the U.S. could certainly begin to close the gap. Related video:

GM claims it's first to sell million 30+ mpg vehicles

As we continue to put together all the data for the year-end edition of By The Numbers, General Motors has announced that it sold more than a million vehicles in the US last year that achieved at least 30 miles per gallon on the highway. More impressively, GM managed this feat using multiple strategies including small vehicle size, turbocharged engines and hybrid or plug-in technologies across four brands (Buick, Cadillac, Chevrolet and GMC) accounting for 13 separate models. This number will grow even more in 2013 thanks to cars like the all-electric Spark, the diesel Cruze, the range-extended Cadillac ELR and the Buick Encore compact CUV.
GM's small car sales were up 39 percent last year helping to attain this million-sales mark for 30-mpg models, and almost 40 percent of all GM sales consisted of cars with fuel-efficient I4 engines. In regards to more advanced means of improving fuel economy, GM says that it plans on having 500,000 vehicles with "some form of electrification" on the road by 2017.
Scroll down for the full list of GM's million 30+ mpg cars as well as an informative press release.