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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 cutting Chevy Sonic, Buick Verano production [UPDATE]

UPDATE: A previous version of this story indicated that Orion Assembly would be idled for seven weeks, from February 16 through April 6. This was incorrect. The factory will instead only be idled for the weeks of February 16 and April 6. The story has been edited to reflect this. General Motors has announced that the factory responsible for the Buick Verano and Chevrolet Sonic will be idled for the weeks of February 16 and April 6, with blame being placed on excess supply. The Orion Assembly plant, about 45 minutes north of GM's Renaissance Center headquarters, employs about 1,800 people, but they'll be given a pair of furloughs as inventories of the sub-compact Sonic and premium compact Verano reach 127 days and 84 days, respectively. That works out to 26,600 Chevys and 9,800 Buicks waiting for buyers. According to Automotive News, the compact Chevy sales bested the industry average in 2014, jumping up nine percent versus the the overall segment's eight-percent gain, while the Buick sedan's sales were down four percent. When asked about the shutdown, a GM spokesman told AN that it will "build to market demand," while also pointing out that the company did not comment on production plans. News Source: Automotive News - sub. req.Image Credit: Bill Pugliano / Getty Images Plants/Manufacturing Buick Chevrolet GM buick encore orion assembly

Pushing Back: GM expanding Chevrolet into Korea, Daewoo out

Chevrolet Camaro goes to South Korea - Click above for high-res image
General Motors decided several years ago to begin heavily promoting Chevrolet as its global mainstream brand even in markets where its existing brands like Opel and Daewoo were a dominant force. Today, at the Busan Motor Show in South Korea, GM Daewoo president Mike Arcamone announced that the Camaro would lead the way in GM's efforts to market Chevrolet in South Korea.
For now at least Chevrolet and Daewoo-branded vehicles will coexist in the Korean market. However, while we were in China last week GM officials told us that the Daewoo brand, which has been somewhat tainted by past quality issues, would eventually be phased out in favor of Chevrolet. When the new Aveo launches next year it will likely be badged as a Chevrolet even though GM Daewoo is in charge of engineering the car.