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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

Chevy Volt has worst sales month since August 2011, Nissan Leaf also down

January is traditionally a time when new car shoppers take a break. For the last few years, if we isolate our focus to just the first two major plug-in cars in the US market, we see that the first month of the year was lower – often dramatically lower – than the 11 that followed. So, when you see the Chevy Volt dropped and Nissan Leaf sales figures for January 2015, don't be too surprised. The Volt sold only 542 units last month, that model's lowest since August 2011. That also represents a 41 percent drop from January 2014, and it reinforces the thought that if anyone out there is interested in a new Volt, they're going to be waiting for the new model to drop later this year. While we do expect sales to climb in February and into spring, we won't be surprised if the general Volt trend remains quiet until the second-generation arrives. On the Leaf side of the ledger, January's low sales numbers were still about twice as high as the Volt's – the Leaf sold 1,070 units last month, the lowest since February 2013 – but it did break a streak for the Japanese automaker. Usually, each month represents at least an increase over the same month a year ago, but that wasn't the case this time. In January 2014, Nissan sold 1,252 Leafs. Still, Brendan Jones, Nissan's director of electric vehicle sales and infrastructure, issued an upbeat statement: "We saw a significant increase in demand in December from Nissan Leaf customers looking to take advantage of federal and state incentives at the end of the tax year, which pulled some sales ahead. We're confident that EV sales will continue to rise over time due to increasing emission regulations and other reasons for purchase of EVs such as lower operating costs, reducing dependence on foreign energy sources, environmental concerns and a great driving experience." The numbers will tell us soon enough. News Source: General Motors, Nissan Green Chevrolet Nissan Electric Hybrid ev sales brendan jones

GM to squeeze out more production capacity for midsize trucks

General Motors was predicting a strong showing for the Chevrolet Colorado and GMC Canyon before they debuted, and demand among dealers for the midsize trucks even exceeded company's expectations. The positive situation has left GM with a problem, though: finding ways to increase capacity for the pickups at the Wentzville Assembly plant in Missiouri. With a third shift already running, GM has continued to look for ways to build just a few more of the trucks at the plant. The company has plans to hire as many as 1,000 more workers for the Saturday and Sunday shifts to construct an additional 2,000 pickups a month, according to unnamed insiders at the factory speaking to Automotive News. The little adjustments even extend to getting rid of an unpaid break to add 18 minute of assembly time over the course of a day, which equals about 3,500 more vehicles a year. All of this effort comes because the trucks are in such high demand. According to GM's figures, the company has delivered a combined 35,720 units of the Colorado and Canyon from January through April 2015, and the Chevy was the fastest-selling truck in the US for the previous three months. In May, it spent an average of just 12 days in showrooms before being snapped up. And even better for the company, 43 percent of these buyers came from other brands. According to Automotive News, the most popular trade-ins have included the Ford F-150, Toyota Tacoma, and Dodge Dakota. Related Video: