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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 natural gas-powered vans recalled due to possible leak

General Motors is recalling almost 3,200 of its compressed-natural-gas powered utility vans because of possible leaks. GM and the National Highway Traffic Safety Administration (NHTSA) released a notice last week saying that 3,196 Chevrolet Express and GMC Savana CNG vans are on recall, though no accidents have been reported due to the possible issue. The recall is specifically for vans for model years ranging from 2011 to 2014. The recall stems from a potential leak from the compressed natural gas high-pressure regulator, and such a leak could cause a fire or explosion. GM will replace the vehicles' high-pressure regulator in order to fix the problem, will do it free of charge and is instructing owners to contact Chevrolet or GMC customer service to arrange for the parts replacement. Utility vehicle makers like General Motors have pushed for fleet sales of CNG-powered vans and trucks for the past few years and have touted them for their cheaper refueling costs relative to standard gasoline, not to mention the fact that natural gas can be readily sourced from throughout North America (thanks, fracking). According to CNGPrices.com, compressed natural gas sells for about $2.22 a gallon, on average, while the AAA is pegging the average price of gas at $3.34 a gallon. NHTSA has posted information on the recall here. Featured Gallery News Source: NHTSA via Reuters Green Chevrolet GM GMC Natural Gas Vehicles CNG gmc savana

Chevrolet FNR is a sharp vision of the future in Shanghai

The Shanghai Motor Show is about more than just displaying the latest extended-wheelbase luxury sedans to the Chinese populace. Chevrolet is taking advantage of the event to debut its vision of the future of motoring with the FNR concept, and the capsule looks like it could be fresh from off the set of Blade Runner. The FNR imagines what a fully autonomous, electric vehicle might look like many years from now and is meant to appeal to young, Chinese consumers. The concept's design from the minds at GM's Pan Asia Technical Automotive Center does a pretty neat magic trick, too. Most times it's a mass of glass and curving lines that looks very sci-fi, but then the dragonfly doors open upwards to reveal some knife-edged angles in the styling, as well. As a cutting-edge concept, this capsule is also packed with futuristic tech. Power comes from magnetic hubless electric motors in each wheel, and it could charge wirelessly. Crystal lasers generate the headlights and taillights, and radar in the roof would allow scanning the surroundings for autonomous driving. The interior is similarly imaginative as the rest of the styling. Passengers are enveloped in blue light while sitting in mostly mesh chairs with huge bolsters. Keys have been done away with entirely in favor of iris recognition. Once on the road, the front seats even swivel around to more easily talk with rear passengers. Check it all out in the gallery above for a glimpse a Chevy's vision of what might be next. Related Video: Chevrolet-FNR and All-New Chevrolet Malibu Make Global Debut at Shanghai GM Gala Night 2015-04-19 SHANGHAI – Two Chevrolet models, the Chevrolet-FNR and all-new Malibu, made their global debut this evening at Shanghai GM Gala Night. They were joined by the Bolt EV concept and the 2015 Captiva, which made their China debut. The new models were introduced as Shanghai GM celebrates the 10th Anniversary of its Chevrolet brand in China. They will appear alongside 12 other models on the Chevrolet display at Auto Shanghai 2015, this year's leading auto show in China, which starts tomorrow. Chevrolet-FNR The Chevrolet-FNR is an autonomous electric concept vehicle that offers a glimpse at mobility of the future. It was developed in Shanghai by GM's Pan Asia Technical Automotive Center (PATAC) joint venture. Engineering, design and electrification teams drew on their past experience developing electric concept vehicles.