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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 will recall 3.5 million pickups and SUVs to fix brake issue

WASHINGTON — General Motors Co is recalling 3.46 million U.S. pickup trucks and SUVs to address a vacuum pump issue that could make braking more difficult and increase the risk of a crash. The recall, which covers 2014-2018 model year vehicles, including some Cadillac Escalade, Chevrolet Silverado, Chevrolet Tahoe, GMC Sierra, Chevrolet Suburban and GMC Yukon vehicles, was triggered because the amount of vacuum created by the vacuum pump may decrease over time, GM told the National Highway Traffic Safety Administration (NHTSA) in documents posted Wednesday. NHTSA opened a preliminary investigation into the issue in November 2018, and said it had reports of 9 crashes and two injuries related to the issue. It provided GM in July with additional field reports that prompted the automaker to open an investigation. The company did not immediately say on Wednesday how many injuries or crashes are linked to the issue but said it could impact braking in "rare circumstances." GM said dealers will reprogram the Electronic Brake Control Module with a new calibration that will improve how the system utilizes the hydraulic brake boost assist function when vacuum assist is depleted. GM said the vacuum assist pump, which is lubricated with engine oil that flows into the pump through a filter screen, can in some cases lose effectiveness over time, as debris such as oil sludge can accumulate on the filter screen. GM told NHTSA that prior model years used a different brake assist system design, and vehicles manufactured after 2018 were not equipped with the affected pump design. Recalls Chevrolet GM GMC

Next-gen GMC Canyon spied with big screen and heavy camo

The next generation of midsize GM pickups is well on its way to being ready, and these new spy shots give us an early look at the new interior inside the GMC Canyon. To our delight, the new Canyon interior doesn’t even remotely resemble the current truck. The relationship between the refreshed SierraÂ’s new interior and what we can see in these Canyon spy shots is impossible to ignore. While itÂ’s not an exact replica of, or a shrunken version of, the CanyonÂ’s screen hardware looks similar to the SierraÂ’s. We can see the volume knob sprouting out of the top left corner, and the whole screen is surrounded by shiny black plastic. The software itÂ’s running is GMÂ’s new Android Automotive-based infotainment that weÂ’ve already sampled in the 2022 Yukon. Just like in that vehicle, we can see that Google Maps is the native navigation system, and it features similar shortcuts on the left-hand side of the screen. Below the screen, the next-gen Canyon features all of its climate controls. The model weÂ’re looking at here must be an upmarket trim, because itÂ’s featuring heated and cooled seats. Another indication that this model could be a Denali (or other higher trim) is the small piece of wood trim on the door that is mostly shrouded by camouflage. We canÂ’t make it out all that well, but any amount of wood trim in a midsize pickup means luxury.  ItÂ’s difficult to make out whatÂ’s going on with the steering wheel, though we can see what appear to be silver switches flanked by flat black buttons. The instrument cluster is similarly difficult to see, but if the little glimpse of a “125 miles to empty” readout is any indication, it could very well be a totally digital cluster. WeÂ’ll need to wait to fully confirm that thought, though. When it comes to the exterior, there isnÂ’t a whole lot to see under the heavy camouflage. We have a reasonable look at the grille behind the mesh, and the front LED lighting signature is partially visible, too. WeÂ’ll note that there isnÂ’t much of a front bumper on this test truck, which is giving it the appearance of being an off-road capable pickup — itÂ’s just nowhere near as extreme as the Canyon prototype we spied last year sporting a ZR2-style suspension.  Big wheels fitted to this tester gives more credence to it possibly being a Denali. The rear is perhaps even more covered up than the front, making it even more difficult to see what GM is hiding.