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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 GMC Acadia gets small changes, price hike

GMC put conspicuous effort into the 2020 Acadia, adding a few more embellishments this year. For 2022 the Acadia gets another nuanced rework, the most important change being the elimination of both the base SL trim and the 2.5-liter four-cylinder engine. The Acadia SLE, the next trim level up from the SL, this year offers the 2.5-liter four-cylinder and 3.0-liter V6 in front-wheel-drive guise. Next year, the only engine available for the front-driver SLE will be the 2.0-liter turbocharged four-cylinder. The spec rearrangement jacks up the Acadia's barrier to entry to $35,995 for the new base model, a $5,000 increase over 2021. There's some give-and-take in the details to even out the exchange. Buyers this year needed to step up to the SLE in all-wheel-drive trim to get access to the 2.0-liter, which started at $38,295, and keeps that price for next year. But SLE pricing only goes up by $900 to swap the 2.0-liter for the 2.5-liter, not much money for a lot more power. The 2.5-liter produces 193 horsepower and 188 pound-feet of torque, the 2.0-liter makes 230 hp and 258 lb-ft. One more cut sees the Acadia AT4 with the five-passenger cabin struck from the menu, six- and seven-passenger seating the only choices. And one more swap sees the $495 Red Mahogany Metallic premium exterior paint replaced by the $495 Light Stone Metallic. Upgrades include new 18- and 20-inch wheel designs, and all 2022 Acadias get the Pro Safety Plus package standard. That installs driver assistance features such as Automatic Emergency Braking, IntelliBeam headlights, Front and Rear Park Assist, Forward Collision Alert, and Rear Cross Traffic Alert. And Traction Select, GMC's name for road surface and terrain modes, is also standard across the lineup.  The 2022 Acadia entered production at GM's Spring Hill, Tennessee plant at the end of last month, the configurator is live now. Related video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.

Chevy Colorado, GMC Canyon midsize pickup trucks to get diesel engines

The market for midsize pickup trucks has all but been abandoned in the US, but General Motors is about to shake the market up with the all-new (to the US) Chevrolet Colorado and GMC Canyon. Launching next year, GM already told us that its new trucks would be a "fuel-efficient alternative" to fullsize trucks, and aside from the smaller size, Automotive News says that these trucks will accomplish this with a diesel engine.
According to the AN report, the next-gen Colorado and Canyon will offer a small, four-cylinder Duramax turbo diesel with a displacement of either 2.5 or 2.8 liters - both engines are currently used in this truck for other markets. This would allow GM to join the Cummins-powered Nissan Titan and Ram 1500 EcoDiesel as the only non-HD trucks in the US to offer diesel. The article goes on to say that the diesel versions of the Colorado and Canyon would launch about a year after the trucks go into production in fall of 2014.