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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).

Did the Chevy Corvette Z06 break 7 minutes at the Ring? Not likely

"Just because it's on the internet doesn't make it true." That's rule number one, two and arguably, three, of surfing the world wide web. In today's example of this rule, we have the following. The website HorsepowerKings is claiming that a 2015 Chevrolet Corvette Z06, with the eight-speed automatic and Z07 package, managed to lap the Nurburgring Nordschleife in under seven minutes. To put that in perspective, that super-quick time would put the 650-horsepower, $97,000 (the price of a 2LZ with the Z07/8AT combo) Z06 a mere two seconds slower around the world's most challenging race track than the $929,000, 887-horsepower Porsche 918 Spyder Weissach. It's about eight seconds quicker than Nissan's own test of the GT-R Nismo Track Pack and 13 seconds faster than a Dodge Viper ACR. Unfortunately, Chevy says there isn't anything to it. We reached out to the Bowtie's Monte Doran, who confirmed that HK's claims are "not accurate." "Any one – a manufacturer, a journalist, a guy standing on the fence of the Ring – can claim a lap time. As such, we think the in-car video is essential to proving a time is real and credible, and Chevrolet will not release a lap until we have a video to substantiate the claim," Doran told Autoblog. "Chevrolet accumulated nearly 1,000 miles of testing on the Nurburgring with the Z06. During that time, we only had two opportunities to run a lap on video – and both were rained out. If we get a lap on video, we will post an official time." Doran finished by referencing the "only official lap time" for the Z06 – a 2:41 around the Virginia International Raceway. Frankly, we aren't terribly surprised by Chevy's position. One would imagine if the Z06 were matching million-dollar hypercars around the 'Ring, the company would literally be screaming about it from Renaissance Center's rooftop. As this is quite the opposite of that, though, we're betting that the real Z06 lap time - while still likely very, very fast – won't be quite quick enough to frighten the brightest and best of today's hypercars.

Weekly Recap: Volvo buys Polestar, makes performance a priority

Volvo is taking its performance business in-house, and the Swedish carmaker announced Tuesday that it bought tuning company Polestar, which has long been known for producing sporty Volvos. The move allows Volvo to ramp up its performance business, and it plans to increase Polestar-branded vehicle sales to 1,000 to 1,500 annually, up from the 750 total projected for this year. The companies have been working together on motorsports projects since 1996. Financial terms of the sale were not released, and Polestar workers will move over to Volvo. Former Polestar owner Christian Dahl will keep control of the Polestar racing team and operate it under a new name. In addition to sales volume, Volvo has ambitious plans for other parts of Polestar, including its aftermarket business. Volvo also said it will use its twin-engine hybrid technology for Polestar models in the future, though specifics and timing were not revealed. Meanwhile, Volvo announced it will offer a run of 265 total Polestars in the United States for the 2016 model year, with S60 and V60s available. "Driving a Volvo Polestar is a special experience. We have decided to bring this experience to more Volvo drivers, placing the full resources of Volvo behind the development of Polestar as the model name for our high performance cars," Volvo CEO Hakan Samuelsson said in a statement. OTHER NEWS & NOTES 2016 Chevy Silverado, GMC Sierra, get nose jobs Automakers tend to refer to light updates as 'facelifts,' and that's exactly what Chevy gave the 2016 Silverado and GMC Sierra. Chevy slightly changed the front end of the truck. Using the one photo released of the new Z71 model as a guide, we can see that the headlights went from a stacked vertical design to single bulbs, and they are set on top of LED running lights. The grille has more body-colored elements instead of shiny metal, and the hood has a new line running down the middle (look really closely). The design theme will be similar across the portfolio, though materials and details will vary, a spokesman said. Some models, like the High Country and LTZ will have more chrome, and the LEDs are only for the upper trims. Chevy also said it will use the eight-speed automatic transmission on more versions of the Silverado, and it updated the MyLink feature to support Android Auto and Apple CarPlay.