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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

Weekly Recap: GM scales back as Russian auto market teeters

General Motors' extensive plans to scale back its Russian operations are the latest sign the automotive market in the former superpower is collapsing – and there are few signs of recovery. GM said Wednesday it will stop selling mainstream Chevrolets and shutter the entire Opel brand in Russia. The moves leave GM with a luxury-focused presence consisting of Cadillac and Chevrolet's Corvette, Camaro and Tahoe. The cutbacks will be completed by the end of the year. The automaker will also idle its factory in St. Petersburg and end a contract-assembly agreement with Russian manufacturer GAZ. "We had to take decisive action in Russia to protect our business," Opel Group CEO Karl-Thomas Neumann said in a statement. "We confirm our outlook to return the European business to profitability in 2016 and stick to our long-term goals." GM is the latest automaker to scale back in Russia as the economic conditions, volatile currency and uncertainty over the conflict in the Ukraine all have sandbagged new car sales. Last month, vehicle sales collapsed 38 percent in Russia to 128,298 units, according to the Association of European Business, which records sales. Joerg Schreiber, chairman of the AEB automobile manufacturers committee, didn't even feign optimism in a statement announcing the figures. "The market is entering a very difficult phase now, and February is only the beginning," he said. "Industry sentiment is the next few months will be extremely difficult and the market bottom has yet to be found." The dovetails with industry experts, who predict the Russian auto sector will remain in the doldrums. IHS said earlier this year it expects Russia's sales to slip to just 1.8 million units in 2015, which is a 40-percent drop from 2012. Other News & Notes Chief leads Jeep's Easter Safari stable Jeep is bringing seven attention-getting concepts to Moab for its annual Easter Safari off-roading celebration in Utah, but the Chief is perhaps the standout of the group. It salutes the 1970s Cherokee with a throwback appearance and surfer styling cues. The Chief has a custom modified razor grille made famous by the Wagoneer, and it rolls on 17-inch slotted mag wheels. The surf theme comes in with ocean blue paint, floral cloth and leather seats and a tiki-style shifter handle. Based on the Jeep Wrangler, the Chief has removable sides, a 3.6-liter V6 engine and a six-speed manual gearbox.

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