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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).

Buyers ditching expensive European sedans to buy expensive American trucks

The New York Times ended the automotive week with a story that adds numbers and context to a range of other stories, from the crossover craze to the increasing median price of a new car to ever more grandiose pickup trucks. The NYT piece reveals that the shift to larger vehicles isn't merely about the average U.S. buyer swapping the midsize sedan for a Ford Edge. Luxury buyers are migrating from plush sedans to plush SUVs and trucks that creep close to six-figure prices, and the Detroit Three are running Treasury presses because of it. From 2013 to 2017, the truck category — everything from pickups to minivans — climbed from 30 percent of the market to 41 percent. In January of this year, trucks claimed 66 percent of new vehicle sales. At the milk-and-honey end of profits, GMC alone accounted for 11.3 percent of all vehicle sales over $60,000, not just trucks. That puts the luxury truck maker behind Mercedes-Benz and Ford, The Blue Oval's feasting on Lariat, King Ranch and Raptor versions of the F-150, which make up more than half of that pickup's sales, putting it ahead of Chevrolet, Porsche and Lexus on the high-dollar sales list. The average transaction price of a GMC in Denali trim last year was $56,000; it's easy to see why, when one dealer told the NYT he just swapped a 2012 BMW 550i for a $71,000 GMC Sierra Denali. That truck starts at $52,900. The NYT started its story with a buyer who took home a Ford Raptor instead of an Audi A6, and optioned that $50,020 Ford Raptor close to $80,000. Over at Lincoln, the new $72,055 Navigator — the one so popular that Ford will increase production — crossed hands for an average sale price of $77,000 in January. And a Jeep dealer told the NYT that the two $93,000 Trackhawks he had on his lot "won't be here more than a few weeks." While trucks head up in sales volume and price, cars are headed so viciously in the opposite direction that "the Detroit Three and even some foreign manufacturers acknowledge they are now losing money on many of the cars they sell." So ... get ready for a lot more crossovers and trucks. Related Video: Find out what vehicle is right for you. Give our Car Finder tool a try.

Despite strong profits, GM still fighting flat market share

Looking at the progress General Motors has made since it entered bankruptcy, it's easy to forget that the company still has a long way to go before it's the juggernaut it once was. A recent report from Reuters points out that, while GM is making money, it isn't making any gains in terms of US market share. Quite the opposite, really. Consider this factoid: In 1963, nearly half of the cars sold in the United States were from Chevrolet, Cadillac, Buick, GMC or Pontiac. Now, the company's US market share is stagnant at 17.9 percent. That same number is half of just Chevy's 1963 market share. This is all despite GM going on a binge replacing or updating its models. "Market share increases are not instantaneous," Mark Reuss told Reuters at the 2014 Detroit Auto Show. "We've got a lot of baggage. Don't underestimate what people though of us, or these brands, through these hardships and 30 years." The reasons for the stagnant market share are numerous. Reuters points out that retooling of factories and a focus on limiting incentives are both good things for profit, but not necessarily for market share. There's also the troubling turnover of the brand's marketing department. These issues don't change the fact that Chevrolet has lost 1.4 percent of its market share in two years, and that Cadillac - arguably GM's most improved brand overall - has lost 1.2 percent in the same period. Part of that can be blamed on GM's avoidance of fleet sales in favor of more profitable customer sales. "Our focus has really been on retail and that's where we've got the growth," said Alan Batey, GM's interim global marketing boss. "We want to grow GM and that means growing market share and profits, but it's not at all costs," Reuss said. News Source: ReutersImage Credit: paul bica - Flickr CC 2.0 Earnings/Financials Buick Cadillac GM GMC sales profits