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2016 Chevy Volt powertrain technical details

The last time General Motors launched a Chevy Volt, it was operating without really knowing how people would use the plug-in hybrid. Sure, it had experience with the EV1, but the Volt was a new kind of car, and you can see in the archives just how much time GM spent explaining this fresh, new powertrain to potential customers. Then, once the vehicle was released, the company collected voluntary data from a large number of owners to learn about their driving and charging habits. The company also asked them what they wanted most in the new version. There's got to be an algorithm buried somewhere in GM headquarters that was used to take all of the numbers GM collected and spat out the headline figures for the 2016 Volt: 50 miles of EV range and 41 miles per gallon. Another important number – price – is something GM isn't talking about yet (expect it in April or May), but the company is sharing some powertrain details about the upcoming car. At a preview lunch in Detroit last week for the SAE 2015 Hybrid & Electric Vehicles Technologies Symposium that's happening now in California, GM engineers Peter Savagian (who is presenting a paper on the new inverter used in the updated Volt) and Tim Grewe (talking about the entire second-generation powertrain) sat down with AutoblogGreen to tell us about the Volt's all-new propulsion system: The overall gist is that the new Voltec 5ET50 drive unit is lighter, smaller and more powerful thanks to a redesigned two-motor traction drive. As previously reported, the new engine is a 1.5-liter DOHC four-cylinder that offers 101-horsepower (at 5,600 RPM). Grewe said it's "great for range extension." The electric motor side of the powertrain offers 149 motoring horsepower from a two-motor, continuously variable transaxle. Initially, the new engine will be made in Mexico. GM will move production to Flint, MI during the first year it makes the 2016 Volt. The battery is slightly bigger in the new Volt – 18.4 kWh compared to 16.5 in the current-gen – and will have less range variation in the cold. GM is also using more of the overall capacity in the pack in the 2016 Volt than in previous versions, but is not saying how much more. GM is not ready to publish acceleration times just yet, but the 2016 Volt has improved numbers, especially when going from 30-60 miles per hour. Most everything on the new powertrain has become more efficient compared to the first-gen Volt.

'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).

Callaway rolls out radical Corvette C7 GT3-R at Hockenheim

Leave it to Callaway to take a badass Corvette and make it even more so. Case in point: the new Callaway Corvette C7 GT3-R you see here. It made its big debut this past weekend during the season finale for the ADAC GT Masters series at the legendary Hockenheimring – the on-again, off-again home of the German Grand Prix. Why in Germany, you ask? Because that's where Callaway Competition is based. The racing division got its start in Heilbronn as Woeher & Ciccone back in 1985. It joined with US-based Callaway Cars in 1988 to distribute its modified Corvettes in Europe, and branched out into constructing racing cars in 1994. And this is its latest project. Designed in partnership between Callaway Competition in Germany and Canadian designer Paul Deutschman, the new GT3-R replaces the previous C6-based Z06.R GT3. It packs a 6.2-liter V8 pumping 600 horsepower through an X-Trac six-speed sequential gearbox. And as you can see, it sure looks the part. Callaway will be offering the new GT3-R to privateer teams for entry in a variety of racing series around the world. But it'll also be fielding the example you see here, sponsored by Whelen Engineering that – like Callaway Cars – is based in Connecticut. Callaway Corvette C7 GT3-R World Debut at Hockenheim October 3, 2015 Hockenheim, Germany – October 3, 2015 – This weekend's ADAC GT Masters Season Finale was the backdrop for the unveiling of Callaway Competition's new Callaway Corvette C7 GT3-R. Following a brief presentation to media and invited guests, the successor of the C6-based Callaway Z06.R GT3 was displayed to the public for the first time on October 3, 2015 at the Hockenheimring in Germany. Constructors of GT race cars since 1990 and based in Leingarten Germany, Callaway Competition possesses a wealth of experience, technical know-how and a broad network of specialized professional partners. These elements were crucial to conduct such a large undertaking. After nearly two years of comprehensive planning, intensive development and expert fabrication of vehicle components, Callaway Competition completed the first C7 GT3-R just a few weeks ago. Its striking design comes as a result of the collaboration between Canadian designer Paul Deutschman and team owners Giovanni Ciccone and Ernst Wohr. Mike Gramke, Uwe Hoffmann, Florian Mohring and Andre Zanke were also heavily involved in the vehicle's development.