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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).

2023 GMC Sierra HD MSRP up at least $1,000

Once Chevrolet bumped up the 2023 Silverado and Silverado HD MSRPs by $1,000, there was no reason to think luxury cousin GMC wouldn't do the same. The proof is here, pricing for the 2023 GMC Sierra HD up on its configurator with premiums of at least $1,000 over 2022 models. As we mentioned of the Silverado, the Sierras have also tracked with the price increases we mentioned in reference to the Chevrolets; the 2022 Sierra 1500 has run up $4,700 over its cost last October, the 2022 Sierra HD is $4,100 more than it was when it hit lots last summer. That puts a 2023 Sierra HD 2500 Regular Cab long bed with two-wheel drive and the 6.6-liter V8 gas engine at a starting price of $42,995 after the $1,795 destination charge, $1,000 beyond the 2022 pickup. At the top, a Crew Cab long bed Denali with four-wheel drive and the 6.6-liter Duramax V8 starts at $83,845, which is $1,250 more than the same rig from the 2022 model year. Moving up a weight class to the Sierra 3500, the price of entry starts $1,000 more than before at $44,195. The big bad boy 3500 Denali 4WD dually starts $1,200 more than before, at $86,245. The situation's a bit cloudier when we step down two classes to the 1500. GM Authority got the price sheet for the 2023 Sierra 1500 and reports that prices are up $1,000 on most trims, but $900 up on the Denali Ultimate and $1,900 up on the AT4. GMC hasn't uploaded the configurator for the 2023 trucks yet, and GMA's price sheet is hard to parse against prices on the 2022 configurator because the end of the model year and supply chain issues have translated into mandatory discounts that can't be accounted for. For instance, the 2022 Sierra 1500 Regular Cab standard box in entry-level Pro trim has an MSRP of $40,000, yet the configurator shows the total vehicle and options price as $39,950. After the $1,795 destination charge, that comes to $41,745. Then there's a mandatory package discount of $1,500, taking the final price before any other fees to $40,245. Meanwhile, GMA's paperwork shows the 2023 price starting at $40,020 after destination, which isn't $1,000 more than any figure on the configurator. At the top end, the 2022 Denali with the Crew Cab, standard box, 4WD, and 6.2-liter V8 comes out to $71,695, only because the front and rear park assist and steering column lock aren't fitted, resulting in a $100 discount.

Refreshed GMC Terrain is introduced. Again.

Back in January of last year, we got our first look at the refreshed GMC Terrain that was supposed to go on sale sometime last fall as a 2021 model. But that was January 2020, just a couple of blissful months before the world shut down. So the Terrain ended up delayed, just like the Chevy Equinox, and now GMC is re-introducing us to the refreshed crossover, which is slated as the 2022 GMC Terrain. This time around, we've been shown photos of not just the new AT4 off-road oriented trim, but other more common variants. They all get larger grilles, larger headlights and new C-shaped taillights, and all trims get fulling LED exterior lighting. Both the AT4 and Denail get unique grille designs, with the former getting a gunmetal grey design with thick slats, and the latter getting an all-chrome one with more delicate lattice-work between the slats. The AT4 also boasts a front skid plate for protection, and from our early preview last year, it seems to get chunkier tires. The Elevation trim returns, too, as a black-out appearance package for the more entry-level SLE and SLT trims. The interior is mostly unchanged except for a revised shifter panel -- the buttons are new, but the same controversial design remains (see the video below). There are new features available, though. Apple CarPlay and Android Auto are still standard, but now they're wireless. A head-up display is available as an option for SLT and AT4, while it comes standard on the Denali. The Denali also gets an 8-inch screen in the instrument panel. Only the turbocharged 1.5-liter four-cylinder and nine-speed automatic have been announced for the Terrain. It makes the same 170 horsepower and 203 pound-feet of torque as before and can be paired with either front- or all-wheel drive. We're expecting a higher-horsepower, larger-displacement engine to be offered in the near future. The SLE, SLT and AT4 models will go on sale this summer. The Denali will follow in the fall. Pricing and additional details should be revealed in the coming months. Related Video: