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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 plans to sell the Chevy Tahoe and Cadillac Escalade in China

General Motors Co plans to sell full-size sport-utility vehicle (SUV) models in China for the first time, and will import a range of models to beef up its product lineup into the world's biggest car market, its China chief told Reuters. The plan would mark a change of tack for GM, which currently produces all of the vehicles it sells in China within the country, which is set to be the only major economy to grow this year amid the COVID-19 pandemic. GM, China's second-biggest foreign automaker, is aiming to offer four models as it looks to improve its brand image and support a sales recovery: Chevrolet's Tahoe and Suburban, Cadillac's Escalade and the GMC Yukon Denali. The Detroit-based company is showcasing those models at the China International Import Expo, or CIIE, an annual import show in Shanghai which started on Wednesday and runs into next week. "Our intention is to get customer reaction and find a way to sell these cars in China," said GM's China chief Julian Blissett. The automaker sees opportunities for such vehicles, partly because Chinese families are expanding, he added. "We are looking into a variety of market sales plans for these vehicles, including online sales, leasing and others," he said, declining to give a detailed timeframe for the plan. GM's Buick and Cadillac mid-size SUVs helped the group's Chinese sales grow 12% in the third quarter this year, the first quarterly growth in the past two years. But it does not have full-size SUV models, which usually have a third row of seats and has room for six or seven people. BATTLEGROUND China, where over 25 million vehicles were sold last year, is a crucial battleground for global automakers including Volkswagen AG, the biggest foreign player by sales volumes, GM and Toyota, as well as local leaders Geely and Great Wall. The country has seen auto sales pick up in recent months following a COVID-19-induced slump, and authorities say they have largely brought the epidemic under control following its emergence in the central city of Wuhan at the end of last year. The expansion plan would also mark GM's first official sales in China of GMC vehicles, a premium brand in the group. Previously GMC vehicles were only sold in the country via unofficial grey importers. The imports will, however, not change GM's basic production strategy in China. It will still mostly sell vehicles made in China - for now, at least. "Depending on however we go we might make other decisions," Blissett said.

Who sold the most heavy-duty pickups in 2012? PickupTrucks.com investigates

Domestic manufacturers enjoyed a good year for heavy-duty pickup sales in 2012. PickupTrucks.com has taken a close look at exactly how those sales broke down between each manufacturer and between three-quarter and one-ton pickups. Ford sold some 67,786 F-250 Super Duty models last year with the Chevrolet Silverado 2500 HD falling just behind at 56,359 units. The Ram 2500 HD came in third at 41,918, while the GMC Sierra 2500 HD earned itself fourth place with 27,616 deliveries. While Ford held onto the top spot in the one-ton market, Ram easily nailed down second place by selling more 3500 HD models last year than General Motors sold Silverado 3500 HD and Sierra 3500 HD trucks combined.
So, did GM manage to sell more trucks than Ford with its two brands? Very nearly. Ford sold a total of 119,338 heavy-duty pickups to GM's 111,555. Ram, meanwhile, moved a distant 77,583. But perhaps more interesting is the diesel take rate in this segment. PickupTrucks.com says 80 percent of all domestic one-ton trucks roll from the dealer lot with a turbo-diesel under the hood. Head over to the site for a closer look at the breakdown.