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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 investing $167m in Spring Hill for new midsize vehicles

General Motors has announced a large investment in its Spring Hill, Tennessee facility. The former home of Saturn production will be getting a $167 million addition to a previously announced $183 million, to cover a pair of new midsize vehicles. The investment is expected to create 1,800 jobs at the factory.
That $350 million is being divvied up for a pair of programs at Spring Hill. The first will take the bulk of the money ($223 million) and create 1,000 of the 1,800 jobs, while the other will take the remaining $127 million and generate the leftover 800 positions. But GM says the investment will cover "midsize vehicle programs." So what could they be?
The leading candidate in our minds is a new crossover for Buick, called the Anthem, that will slot between the Encore and Enclave, but will be slightly smaller than the Equinox and Terrain. As we've explained, the new model will likely be the first product to sport GM's new D2UX platform, which will eventually replace both the Delta and Theta platforms. Spring Hill is already building the Equinox, so there could be some credence to this theory.

Chevy Volt sales surge with 2016 model, Nissan Leaf continues Autumn fall

The Nissan Leaf and Chevy Volt have been locked in sales combat since they arrived within a short distance of each other way back in 2010, and we continue to follow that fight closely. Though both vehicles approach driving efficiency from a different angle, they each have plugs and owners put a surprisingly similar number of electric miles on them. With the launch of its 2016 model, the Bowtie brand now appears to have the upper hand, clocking in a solidly improved performance for the month of October. According to GM's sales charts, the Chevy Volt made it into the loving embrace of 2,035 buyers last month. That's up a whopping 41 percent over the same period in 2014, and more than a 100 percent improvement from the 949-unit result in September. Now, we don't know how many of these were 2015 models and how many were the all-new 2016 edition. Dealers are, no doubt, incentivized to move the old inventory, and the latest and greatest is still only available in a limited number of states. Breaking out the sad trombones, Nissan recorded a mere 1,238 units moved in October. That's down 52.2 percent from the same month in 2014. That's also nine fewer examples than last month. Despite its recent sales travails, the Leaf still leads the calendar-year-to-date figures by a commanding 14,868 to 11,299 tally. We imagine the Japanese manufacturer is counting on an improvement in the situation once the 2016 model, with its larger, optional 30 kWh battery becomes available. You can compare these two stalwarts with the rest of the green-vehicle field in our By The Numbers post due out tomorrow. Green Chevrolet Nissan Electric Hybrid ev sales hybrid sales volt