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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 Recalling Another 2.7 Million Vehicles In Five Separate Campaigns

The recalls keep rolling in from General Motors, evidently keen to avoid repeating the mistakes of the ignition-switch debacle and clean house. This time they're all coming at once, with five separate recalls announced together covering approximately 2.7 million vehicles. The largest of the five actions involves over 2.4 million units of the previous-generation Chevrolet Malibu and Malibu Maxx, Pontiac G6 and Saturn Aura in order to fix brake light wiring harness, which have been found to be susceptible to corrosion. The recall is separate from the 56k Aura sedans which GM recently recalled over faulty shift cables, not to mention the previous massive recall of 1.3 million vehicles – some of them the same models – but appears to have resulted from the National Highway Traffic Safety Administration investigation that started with the G6 almost a year ago. The second-largest campaign involves the 2014 Chevy Malibu, specifically those fitted with GM's 2.5-liter engine and stop/start system, approximately 140,000 examples of which has been found to have problematic brakes. The issue does not appear to be connected to the recall of 8k Malibu and Buick LaCrosse sedans (also involving brake woes) which we reported upon last week. Four crashes have been reported in such models, but GM admits it's not yet clear if the problem was a contributing factor in the accidents. A further 112k Corvette models from the 2005-2007 model years are being called in for problems with their low-beam headlamps resulting from a flexing relay control circuit wire that's not meant to bend. GM says it is "aware of several hundred complaints" about this issue, but notes that there have been no reports of related accidents. In addition, over 19k examples of Cadillac CTS from the 2013 and 2014 model years are being recalled over windshield wipers that might not work after a jump start. Finally, GM is also bringing in 477 examples of its 2014 Chevy Silverado, Tahoe and GMC Sierra (though not the Yukon) to fix a problem with a tie rod in its steering rack. As ever, all recall repairs will be performed free of charge, and GM is now estimating that recall-related actions this quarter will result in an estimated $200-million charge against its second-quarter earnings. Read the full announcement from GM below for further details.

2020 Ford Explorer vs 3-row crossover rivals: How they compare on paper

The 2020 Ford Explorer has finally landed, and if history serves as an indicator, it should be bigger than sliced bread. And people sure love themselves some sliced bread. This new Explorer may look familiar on the outside, but beneath the skin is a radically new rear-drive platform related to the Ford Mustang (as opposed to a front-drive platform related to the Ford Taurus and a Volvo from the 1990s). Turbocharged four- and six-cylinder engines now exclusively rest under its hood, which as you'll see below, both better anything its competitors offer. Ah, but if you're curious to know how the new 2020 Explorer compares to its various three-row family crossover rivals, take a look at the chart below where we stack it up against the 2019 Chevrolet Traverse, 2019 Honda Pilot, 2020 Hyundai Palisade, 2019 Subaru Ascent and 2019 Toyota Highlander. There are others of course (Mazda CX-9, Dodge Durango, GMC Acadia, VW Atlas), but we only had so much room on the chart, and these were the newest and/or most likely to be cross-shopped with the new Explorer. Engine specs and towing Although the Traverse's V6 just nips it on horsepower, the 2020 Explorer's base 2.3-liter "EcoBoost" turbocharged four-cylinder engine smokes it on torque. Therefore, "best-in-class" power seems like a fair claim from Ford. That there's also a 365-horsepower turbo V6 available, plus a hybrid and even-more powerful ST model on the way shows that Ford isn't kidding around under the hood. Curb weight also seems competitive for the segment. In terms of drivetrain, the Explorer is the only member of this particular group to come standard with rear-wheel drive (2.3-liter only). The Durango is the only other three-row, non-luxury crossover to do so. This is significant for two reasons: First, you could potentially do a power slide in an Explorer. Second, and more important, those in the Snowbelt will have to opt for all-wheel drive (it comes standard with the 3.0-liter). By contrast, a set of winter tires will probably do the job just fine if you want to save some money and gas by sticking with its rivals' standard front-wheel drive. Well, except for the Subaru Ascent — that's standard with AWD. In terms of towing, the Explorer takes the cake with as much as 5,300 pounds for the four-cylinder and 5,600 pounds for the V6. Everything else tops out at 5,000, though again, the Durango is capable of besting them all thanks to its Hemi V8 engine option.