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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).

GMC Envoy could be returning as GM files for 'Envoy' trademark

The GMC Envoy could be on its way back, if a recent GM trademark filing is any indication of the future. To be exact, GM's trademark filing is for the name "Envoy," and is applicable to "motor vehicles, namely, sport utility vehicles, engines therefor and structural parts thereof." A victim of the recession and high gas prices, the original Envoy – related to the Blazer, and more recently the TrailBlazer and similar GM SUVs – was discontinued after the 2009 model year. In today's SUV-happy market of low gas prices, unearthing the somewhat familiar Envoy name makes a certain amount of sense. As soon as gas prices start trending in the other direction, we'll all be saying the opposite, though. What this SUV will take shape as is the big question now. With the Chevrolet Blazer well and truly on its way, there's every reason for a GMC version of Chevy's stylish new crossover sporting the Envoy name. Another, less likely, possibility is a Traverse-sized vehicle to slot between the shorter Acadia (10 inches shorter than the Chevy Traverse) and the body-on-frame Yukon. GM could come out of left field and make the Envoy a Buick too. It fits the bill with the "En" beginning, and Buick undoubtedly has crossovers in the works. We think that's even more unlikely, but it's important to remember that we're still in the speculation phase. Soon we'll drive Chevy's new Blazer, and perhaps have more news then. Check in next week for that. Related video:

2021 GMC Yukon starts at $51,955, just $100 more than outgoing model

The 2021 GMC Yukon and Yukon XL have prices, and they're bargains considering the upgrades the new model delivers. The base Yukon SLE starts at $51,995 after the $1,295 destination charge, a $100 premium over the current model. The extended wheelbase Yukon XL in base SLE trim starts at $54,695, the same price as the outgoing model. The price for all-wheel drive stands pat for trims that make it an option, at $3,000. Prices for the two-wheel drive Yukon and Yukon XL trim steps are below, with price differences compared to the 2020 models. Keep mind that the new AT4 trim comes standard with AWD, so the AT4 is in a sense closer in price to the SLT and further from the Denali than it appears here: Yukon SLE: $51,995 (+ $100) Yukon SLT: $59,095 (- $810) Yukon AT4: $66,095  Yukon Denali: $69,695 (+ $800) Yukon XL SLE: $54,695 (No change) Yukon XL SLT: $61,795 (No change) Yukon XL AT4: $68,795 Yukon XL Denali: $72,395 (+ $600) The drop in price on the Yukon SLT is in comparison to the 2020 Yukon SLT Standard Edition trim, not the lower-spec SLT trim. The new Yukon comes in at $1,700 more than the 2021 Chevrolet Tahoe, the same price difference in effect between the Yukon XL and Suburban. The standard Yukon is powered by a 5.3-liter V8 with 355 horsepower and 383 pound-feet of torque, the same specs as found in both the Tahoe and Suburban. The Yukon Denali trims, as with the High Country trims on the Chevy twins, outdo the 5.3-liter with a 6.2-liter V8 making 420 hp and 460 lb-ft. Both engines shift through a 10-speed automatic. Stuffing a Yukon XL Denali with options can take the MSRP beyond $80,000, thanks to available features like the panoramic sunroof, rear seat entertainment, air suspension, and Magnetic Ride Control Suspension.   We're still awaiting pricing for the coming 3.0-liter Duramax inline-six with 460 pound-feet of torque, which we expect closer to the on-sale date for the new full-sized SUVs.  Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Bronco, Yukon, Hummer and a CES recap | Autoblog Podcast #610