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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).

2015 Chevrolet Cruze spied on its home turf

The next Chevrolet Cruze isn't set to go into production for about another year, and we're just now seeing prototypes of the new compact running around here in the States. Not much more has been revealed since we saw the car blasting through the snow in Europe, but we can still clearly see new design elements like the larger grille, slimmer headlamps and redesigned taillamps.
Our spy photographers worked up a composite image of this Cruze prototype alongside the current model, and here, we can clearly see some big visual changes are in store for the new model. The 2015 Cruze's hood slopes downward more dramatically, the windshield is more heavily raked, and the roofline looks more fluid overall. The next-generation Cruze will ride on the new global Delta platform that will also underpin other General Motors vehicles like the Chevrolet Volt and Equinox.
As for what's under the hood, we expect the normal range of gasoline four-cylinder engines (both naturally aspirated and turbocharged), and the compact's new turbodiesel four should carry over, as well. Have a look at the full brace of spy photos in the gallery above.

Chevrolet only automaker to win EPA's 2015 Climate Leadership Awards

Chevrolet was the only automaker to be on the list of entities for the US Environmental Protection Agency (EPA) Climate Leadership Awards. Of course, the accolades had nothing to do with any vehicle's tailpipe emissions, General Motors can still be proud. The automaker is engaging in what it calls the Chevrolet Clean Energy Campus Campaign. Chevy is working with the US Green Building Council, among other groups, to find ways for buildings in primary and secondary schools as well as college campuses to reduce their collective carbon footprint via better design. The EPA pointed out the "carbon performance methodologies" used by Chevrolet to run the program and spur lower emissions from its campus partners. The effort is part of Chevrolet's broader goal to reduce greenhouse-gas emissions by as many as 8 million metric tons of CO2. And it's going to take more than bunch of plug-in Volt and Spark EVs to do that. Other entities feted by the EPA include UPS, Bank of America, the cities of San Francisco and Oakland, Clorox and Tiffany & Co. Yes, Tiffany. Take a look at the EPA's press release below, and find out more information on Chevy's program here. UPS, Bank of America, SC Johnson Among 16 Organizations across the U.S. Recognized for Climate Action / EPA also recognizes Chevrolet Clean Energy Campus Campaign, San Diego Regional Climate Collaborative in new Innovative Partnerships Category WASHINGTON – From an innovative partnership enabling colleges to sell carbon credits to fund clean energy projects on campuses to some of the country's leading corporations setting and exceeding aggressive emission reduction goals, the U.S. Environmental Protection Agency's Climate Leadership Award winners announced today are demonstrating that innovative actions to combat climate change are smart business decisions. Sixteen organizations and one individual representing a wide array of industries from finance and manufacturing to retail and technology show exemplary corporate, organizational, and individual leadership in response to climate change. "I am proud to recognize our Climate Leadership Award winners for their actions to reduce the harmful carbon pollution that's fueling climate change," said EPA Administrator Gina McCarthy. "Our winners are demonstrating that a healthy environment and a strong economy go hand in hand.