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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

Opel pulls out of Russia, GM to focus on Cadillac, 'iconic' Chevys

General Motors is going to realign its priorities in the struggling Russian marketplace, withdrawing its Opel brand and pulling out mainstream Chevrolet models. Instead, the General will take aim at Russia's well-established oligarchy, pushing Cadillac as well as "iconic" Chevrolet models, like the Corvette, Camaro and Tahoe. "This change in our business model in Russia is part of our global strategy to ensure long-term sustainability in markets where we operate," GM president Dan Ammann said in a statement. "This decision avoids significant investment into a market that has very challenging long-term prospects." Russian customers interested in an Opel or mainstream Chevys like the Spark, Aveo (the US market Sonic), Cobalt (shown above), Cruze, Orlando and the like have until December to snap up a car before the brands are pulled. "We do not have the appropriate localization level for important vehicles built in Russia and the market environment does not justify a major investment to further localize." Opel Group CEO Karl-Thomas Neumann said. GM will continue to offer service to customers in Russia. "We can assure our customers that we will continue to provide warranty, parts and services for their Chevrolet and Opel vehicles," Neumann said. Beyond realigning its brands in Russia, GM also announced that it would also be idling the company's factory in the country's second-largest city, St. Petersburg. This is the second time the St. Petersburg factory has been in the news – GM announced that it'd be idled for roughly two months back in February. Scroll down for the official press release from GM. GM to Change Business Model in Russia 2015-03-18 Focus on Cadillac and iconic Chevrolet vehicles Wind down Opel brand and sale of mainstream Chevrolet cars Idle GM Auto manufacturing facility in St. Petersburg Part of GM's strategy to ensure long-term sustainability in global markets DETROIT – General Motors today announced plans to change its business model in Russia. GM will focus on the premium segment of the Russian market with Cadillac and U.S.-built iconic Chevrolet products such as the Corvette, Camaro and Tahoe. The Chevrolet brand will minimize its presence in Russia and the Opel brand will leave the market by December 2015. "This change in our business model in Russia is part of our global strategy to ensure long-term sustainability in markets where we operate," said GM President Dan Ammann.

Saturn Vue ignition switch leads to new group of GM recalls totaling 312k

General Motors has another spate of recalls to announce. This time they cover 312,280 vehicles worldwide, including 269,041 of in the US, in a total of six campaigns. In 2014, the automaker has recalled 29,079,765 vehicles worldwide, with 25,754,356 of those in the US.
The largest among them covers 215,243 units of the Saturn Vue from 2002-2004 model years worldwide, 202,115 in the US. It's possible for the for the key to be removed even when the ignition isn't in the OFF position. The company knows of two crashes and one injury caused by this problem. Dealers are checking the parts and replacing the ignition cylinder and key set, if necessary.
Next is 72,826 models worldwide (48,059 vehicles in the US) of the 2013 Cadillac ATS four-door sedan, 2013 Buick Encore and 2013 Chevy Trax in Canada. It's possible that the for lap belt pretensioner to retract but not to lock, which could increase occupant movement during a crash. Both front, outboard lap belt pretensioners are being replaced, and a stop-sale is in effect on unsold models until the problem is repaired. There are no known crashes or injuries, though.