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GM patent reveals new two-stage turbocharger

Modern turbochargers may be some of the best ever made, but performance is something that engineers are always trying to improve. According to GM Inside News, General Motors (GM) is hoping to alleviate some of the negative aspects of a two-stage turbocharger setup with a newly-patented design. The patent, that was filed on May 19, 2016, reveals a clever bypass system that allows the engine, a four-cylinder unit, to optimize both the low-pressure and high-pressure inlets for its respective functions. According to the filing, a conventional two-stage turbocharger setup is engineered to allow both turbines to operate simultaneously at low and mid engine speeds. At high engine speeds, only the low-pressure turbine works. The setup can't isolate either the low or high pressure side, which can impair low-end performance. GM's new two-stage turbocharger setup looks to eliminate this by linking the high-pressure turbo to the exhaust manifold through the high-pressure inlet duct. The low-pressure turbo is attached to the high-pressure turbo by a low-pressure inlet duct, which is linked to a connecting channel. A single actuator that is housed in the exhaust manifold creates a bypass that can opens the high-pressure inlet or close the connecting channel. Depending on what the engine load and speed is, the ECU guides the actuator—a single rotating spindle with discs corresponding to flanges on the high and low pressure sides—to isolate one of the two turbos. Isolating the turbos allow the respective inlets to be engineered for the best possible fluid dynamic performance. The setup should increase performance and decrease lag. There's no word on what car this setup will make an appearance on, but it will most likely be used in premium vehicles before trickling down to the rest of GM's vehicles. Related Video: News Source: GM Inside News, AutoGuide via GM Authority Cadillac Chevrolet GM Technology Sedan turbo patent engine turbocharging

GM lays off 450 at Lansing Grand River Assembly

General Motors will lay off 450 employees at its Lansing Grand River factory, The Detroit News reports, which is 100 more than the company said it'd be letting go last month. Lansing Grand River Assembly currently builds the Cadillac ATS and CTS, both of which have suffered sluggish sales, with the smaller sedan down 20 percent through last month and the larger model down 2.3 percent, The Detroit News reports. "We are adjusting plant production capacity to better align with market demand. Beginning in January 2015, the plant will operate on a single shift," a GM statement read, before explaining that not all the laid off Grand River employees will be jobless. Of the employees that have been laid off to make room for the single work shift, around 200 will transfer to the Lansing Delta Township factory, home of the Lambda-platform crossovers, GM's statement confirmed. The News expects this one-shift arrangement to continue until at least late next year, when the Alpha-platform Chevy Camaro transitions from General Motors' Oshawa, Ontario factory to Lansing. Cadillac President Johan de Nysschen said at last month's LA Auto Show, "It may not necessarily be permanent, a time may come when we've gained momentum and we can reinstate it. But for now, the adjustment to production capacity is in alignment with our plans for 2015."

2016 Cadillac CT6 has arrived

We have known for a while that the 2015 New York Auto Show would mark the debut of Cadillac's latest flagship model. But after months of waiting as Caddy slowly revealed details, the 2016 Cadillac CT6 has finally arrived. The sedan is a technological tour de force for the brand and inaugurates a long list of new technologies. The CT6 will begin production at the Detroit-Hamtramck Assembly plant in late 2015 and will go on sale with three engine options. Caddy won't release final figures yet, but based on preliminary numbers, we know the base 2.0-liter turbocharged four-cylinder will make 265 horsepower. Stepping up to the newly revised 3.6-liter V6 will net buyers an estimated 335 hp, and finally there will be the 3.0-liter twin-turbo V6 with an output of around 400 hp. All of these engines will be mated to eight-speed automatic transmissions, and six-cylinder models will get standard all-wheel drive that will be able to constantly vary the power sent to the front wheels. Carrying those powertrains is the new, aluminum-intensive Omega architecture. In addition to the lightweight metal making up the platform, the entire exterior also uses it to provide an estimated curb weight of less than 3,700 pounds. The decision to shed mass makes the CT6 a featherweight in its class – for comparison, the lightest, six-cylinder Audi A8 weighs 4,365 pounds. The sedan rides on a 122.4-inch wheelbase and is 204 inches long. That makes the Cadillac about 1.3 inches shorter than the smallest BMW 7 Series, but the Caddy is projected to tip the scales at less than both the big Bimmer and even the 5 Series, too. Cadillac wants the CT6 to be a luxury sedan that drivers can enjoy. In addition to the low weight, there's an available Active Chassis System throughout the range with rear-wheel steering and Magnetic Ride Control. When combined with the all-wheel-drive system, it means every corner of the car is both driving and steering the vehicle. Inside, the CT6 offers a ton of tech and luxury. Drivers are held in massaging, leather seats, and rear passengers also get adjustable chairs that are heated and cooled. Quad-zone climate controls keep everyone comfortable. Plus, in addition to the 34-speaker Bose audio system and streaming rearview mirror, there are features like a 10.2-inch CUE infotainment system with a capacitive touchscreen and console-mounted touchpad. The display also shows a 360-degree view outside and can even record video when the security system is activated.