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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).

Recharge Wrap-up: Lexus CT 200h is NWAPA's favorite hybrid, 'No Charge to Charge' in LA

The Northwest Automotive Press Association (NWAPA) has given the Lexus CT 200h its Favorite Hybrid title. It named the compact luxury hybrid its favorite of 2014 at its Drive Revolution in Portland (where it also named the new Volkswagen Golf TDI the Northwest Green Car of the Year). According to NWAPA president Nik Miles, the CT 200h earned the honor for "impressive combination of state-of-the-art small car luxury and hybrid technology." For 2014, the Lexus CT200h got an updated front end, including the spindle grille we've been seeing on new Lexus vehicles, plus a redesigned steering wheel and sliding sun visors. Read more in the press release below. Chevrolet credits the Malibu for helping make stop-start mainstream. Chevrolet started including stop-start technology standard in Malibus equipped with the four-cylinder engine. Chevy has sold about 83,000 of that model, so 97 percent of 2014 and 2015 Malibu sales include stop-start. Now, that technology has made its way into the 2015 Impala. With drivers idling an average of 16 minutes a day, stop-start can significantly reduce harmful emissions and save fuel. According to Navigant Research, we can expect annual sales of cars equipped with stop-start technology to surpass 55 million by 2022. Read more in the press release below. Nissan Leaf customers in Los Angeles will get access to free charging beginning August 15. Nissan is extending its "No Charge to Charge" promotion to LA, which will allow customers to charge at public charging stations at no cost. Leaf customers - including those who bought or leased their car from the participating dealerships on or after July 1 - will get an EZ-Charge card, allowing them to use ChargePoint, Blink, CarCharging, AeroVironment and NRG eVgo chargers for free. Rapid chargers can charge the Leaf's battery to 80 percent in 30 minutes. Nissan plans to offer the "No Charge to Charge" in at least 14 more markets in the US, bringing the total to 25, within the next year. See the press release below for more details. California will get six all-electric school buses for three school districts as part of a demonstration program. The California Energy Commission awarded a grant of $1.4 million for the program to National Strategies LLC; this is in addition to a $2.2-million grant from the South Coast Air Quality Management District. The EV buses use vehicle-to-grid technology, allowing them to sell energy back to the grid when it is needed.

Watch this time-lapse build of the Chevy SS for NASCAR

There's only about a week left until we get our first look at the production version of the 2014 Chevrolet SS sedan, but Chevrolet NASCAR teams have been looking at the race version of the car all winter. Autoweek has posted a really neat time-lapse video showing just a portion of what it takes to build one of NASCAR's new Gen6 stock cars.
Though the video is quite brief, it does show almost the entire build process starting with just the car's nose, and it gives us a good look at how integral the template is to the final product. As a bonus, Hendrick Motorsports also provided some videos showing two of its teams performing pit stop tests over the winter. The second video shows some of the more detailed aspects of the racecar's rear end, including the stock-looking trunk cutout and a newly mandated rear bumper extension that will be used on super speedways like Daytona and Talladega.
To see what Team Chevy has been up to all off-season, check out all three videos posted after the jump.