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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 profit dips on truck changeover, but beats estimates

DETROIT — General Motors on Thursday reported a higher-than-expected quarterly profit despite a drop in production of high-margin pickup trucks, as it gears up for new models that are expected to boost profits next year. Like rivals Ford and Fiat Chrysler Automobiles, GM is banking on highly-profitable Chevy Silverado and GMC Sierra pickup trucks to lift profits, as consumers shift away from traditional passenger cars in favor of these larger, more comfortable trucks, SUVs and crossovers. During the first quarter, the process of changing over to GM's new pickups resulted in a drop in production of 47,000 units. GM Chief Financial Officer Chuck Stevens said the production drop had resulted in a drop in pre-tax profit of up to $800 million. Earlier this year, GM said its 2018 profits would be flat compared with 2017, but expected its all-new pickup trucks would boost margins starting in 2019. On Thursday, GM reiterated its full-year 2018 forecast for adjusted earnings in a range from $6.30 to $6.60 per share. The automaker said capital expenditures were more than $500 million higher in the quarter because of investments its new pickup trucks and a family of low-cost vehicles under development with Chinese partner SAIC Motor Corp. On Wednesday, rival Ford said it would stop investing in most traditional passenger sedans in North America. CFO Stevens told reporters on Thursday that GM has "already indicated that we will make significantly lower investments on a go-forward basis" in sedans. 2019 GMC Sierra View 21 Photos GM benefited from a lower effective tax rate in the quarter, but adjusted pre-tax margin fell to 7.2 percent from 9.5 percent a year earlier. Stevens said the company's profit margin should hit 10 percent or higher in the second quarter and for the full year. GM said material costs were $700 million higher in the first quarter, and it expects those costs to continue rising. The automaker said it would counter those increases with cost cutting measures. "It is a more difficult environment than it was three or four months ago," Stevens said when asked about rising commodity prices from potential steel and aluminum tariffs announced by the Trump administration. "But we are confident we can continue to offset that." The company reported quarterly net income of $1.05 billion or $1.43 per share, a drop of nearly 60 percent from $2.61 billion or $1.75 per share a year earlier. Analysts had on average expected earnings per share of $1.24.

GMC Canyon AT4 OVRLANDX concept previews potential Bison-like model

GMC is signaling a move into serious off-road territory with this Canyon AT4 OVRLANDX concept. As its name suggest, this one-off was put together as a demonstration of what an overland-style GMC midsizer could potentially look like, but a glance beneath the surface reveals the bones of what we expect to be the forthcoming Canyon AT4X.  While "AT4" has been trickling down through the GMC lineup for the past few model years, AT4X kicks the basic off-road formula up a notch, a la Chevrolet's Colorado ZR2, which gains extra underbody protection, locking front and rear differentials and Multimatic's phenomenal DSSV dampers.  GMC Canyon AT4 OVRLANDX Off-Road Concept View 23 Photos OVRLANDX takes that to the next level, borrowing (and building upon) cues from the even-more-rugged ZR2 Bison, including rocker panel guards, cast-iron control arms, a custom front bumper with an integrated winch, built-in front recovery points, wheel arch trim with integrated LED task lighting, and guy lines for protecting the windshield from low-hanging branches. The custom rear bumper is even from American Expedition Vehicles (AEV), with whom Chevy partnered to produce the Bison's unique exterior bits. Does that seem like a wink and nod to you? “We wanted to showcase GMC Canyon with this concept and punctuate GMCÂ’s commitment to premium, off-road capable vehicles,” said Buick & GMC Global Vice President Duncan Aldred. "Consumer reaction to this conceptÂ’s design will help us further serve the growing market of buyers leading authentic outdoor lifestyles." This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. To that end, they threw a few more goodies at the concept. In a way, the roof-mounted tent, awning, cooler and kitchenette are just there to disguise the fact that GMC will likely build a production pickup with much these same specs when the new model debuts for the 2023 or 2024 model year – or perhaps even sooner. While this concept is built around GM's existing 3.6-liter V6 powertrain, the redesigned Canyon is expected to be offered with just one engine: a 2.7-liter turbocharged four-cylinder lifted from the Silverado and Sierra pickups.  Rumors have pointed to a GMC variant of the Colorado ZR2 since the midsize pickup adopted the AT4 branding for its off-road variant.