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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 dealers unhappy about pickup prices

The backlash is beginning. Following General Motors' price hike of the Chevrolet Silverado and GMC Sierra last week, dealers across the country are expressing their ire over increasing prices in the face of rebates and discounts on trucks from Ford and Ram.
Speaking to Automotive News, Sam Pilato, the general manager at Dimmitt Chevrolet in Clearwater, FL, Silverados are "selling very poorly." W. Carrol Smith, the president of Monument Chevrolet in the heart of truck country, Texas, said, "[GM's] position is that the vehicle stands on its own and it doesn't need a bigger rebate. That's not what the market is telling us."
According to AN, that's the general attitude amongst Chevy and GMC dealers across the country, where the twin pickups are getting butchered in sales by competitors offering up to $9,000 off their sticker prices. Part of the problem for GM is that its trucks are arriving on the market near the end of the current F-150's lifecycle, a fact that Ford has taken advantage of.

Deep discounts — $12K, $13K, $16K — are fueling a pickup price war

Heavy discounts of up to $16,000 per vehicle are fueling a "truck war" among full-size pickups sold in the United States by the Detroit Three, a Reuters analysis shows. Strong U.S. sales this year of the highly profitable big trucks have helped offset lagging passenger car sales. But it is not clear how much of the truck demand is linked directly to ample factory incentives and dealer discounts, or how far sales might decline without those subsidies. A Reuters survey of Ford, General Motors Co's Chevrolet and Fiat Chrysler Automobiles's Ram truck dealers across the United States indicates stores are offering deep discounts the country's bestselling full-size pickup trucks. "The walls are not crashing down on full-size trucks," said Sam Fiorani, vice president of global vehicle forecasting at AutoForecast Solutions in Chester Springs, Pennsylvania. Detroit-based automakers want to keep cranking out their high-margin trucks, he added, and "giving up a little of the profit is the cheapest way to do it." Stores are offering discounts of up to $12,000 on the 2018 Ford F-150, which remains the best-selling vehicle in the country, recording more than 80,000 sales in May. Discounts run up to $13,000 on the 2018 Chevrolet Silverado and as high as $16,000 on the Ram 1500. Average transaction prices for full-size pick-ups range from around $42,000 to $45,000, industry analysts and automakers say. All three companies are spending furiously - GM and Fiat Chrysler to help sell off carryover 2018 trucks to prepare for redesigned 2019 models, and Ford to sustain its long-held sales crown. A supplier fire that temporarily shut down production of the F-150 last month "changed the game," said Jeff Schuster, senior vice president of forecasting at LMC Automotive in Troy, Michigan said. The supply halt nudged Ford's crosstown rivals "to ratchet up incentives on the current models to go after weakness at Ford," he said. Deals advertised on the companies' official websites range from rebates and low-interest loans to ultra-cheap lease rates, but they are not telling the whole story. Ford, for instance, advertises a $2,000 rebate and a $500 financing credit on sales of certain F-150 models. But James Collins Ford in Louisville, Kentucky, is offering discounts of up to $12,215 on the 2018 F-150 XLT SuperCrew 4x4. The price cuts are even steeper at a number of GM and Fiat Chrysler dealers. Quirk Chevrolet is selling the 2018 Silverado 1500 Double Cab at $13,000 off sticker.