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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).

2022 Chevrolet Silverado and GMC Sierra now cost more, again

GM Authority put Chevrolet and GMC pickup truck prices under the microscope, spying the same macroscopic issues none of us can avoid seeing: Price increases. The 2022 Chevy Silverado 1500 and 2022 GMC Sierra 1500 have been hit with their third price increases this year. The Heavy Duty versions of those same trucks have been given their fourth price increases this year. Starting with the light-duty options, they've been rung up for another $900 across the board, which breaks down to $800 added to the MSRP and $100 added to the destination charge. The mandatory cost for shipping a truck from the factory to the dealer is now $1,795. That destination fee is now more than 5% of the purchase price of the least expensive 2022 Silverado, the Regular Cab Work Truck trim with a Standard Bed and 2.7-liter turbocharged four-cylinder retailing for $36,395 after destination. And that price is $3,200 more than the initial list price from last December. At the other end, the Silverado ZR2 is up $3,400. Average that out, and the Silverado's MSRP has gone up by nearly $700 every month since initial pricing came out. On the GMC side, the bidding starts at $37,195 for the Regular Cab Pro trim with a Standard Bed, a $4,700 increase over pricing announced last October.  Stepping up a tow rating or two, the Silverado HD is now $1,100 more expensive — $1,000 tacked onto the MSRP, the destination charge plumped another $100 to $1,795. The Silvy 2500 HD now starts at $41,295. The Sierra HD turns the screw a few more degrees, going up by $2,100 after the $100 increase for destination. The low bar for the Sierra 2500 HD is $41,995, a $4,100 rise over the price when it hit dealer lots last summer. Whew. Anyone know where the exit is for this "new normal?" Related video:

Read This: Auto Extremist advocates for Corvette as brand with multiple models [w/poll]

The 2014 Chevrolet Corvette really grinds Peter De Lorenzo's gears. Or, more accurately, the self-anointed Auto Extremist has an issue with what he sees as mismanagement of the legendary sports car by General Motors executives. In a new editorial on his website, De Lorenzo argues it's time to split Corvette off from Chevrolet to create an all-new brand, complete with a model range with at least three new takes on the sports car. Capable of fully leveraging the successes of the Corvette Racing program and brandishing the full might of GM's technical prowess, the Corvette brand would theoretically give Porsche something to sweat over.
Sure, that sounds like a party, but given GM's troubled track record when it comes to launching (let alone managing) brands, we say that's slippery slope that could just as easily end with the whole Corvette franchise in the scrap bin. Either way, the notion is certainly an interesting one. Head over to Auto Extremist to take in the full editorial, and then let us know what you think in Comments. Should GM split off its most storied nameplate?
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