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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

BMW M4 versus Audi RS5 | Autoblog Podcast #546

On this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Associate Editor Reese Counts. We debate the merits of the BMW M4 and the new Audi RS5 and our hopes for the refreshed Mercedes-AMG C63. We also discuss the state of Cadillac, the future of the Ford Fusion and the rumored Mercedes-AMG competitor to the Porsche 718 Boxster and Cayman. Autoblog Podcast #546 Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown 2018 BMW M4 versus 2018 Audi RS5 Cadillac and Mercedes-AMG sport coupes The state of the luxury car industry The future of the Ford Fusion Replacement for the Mercedes-Benz SLC Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video: Design/Style Podcasts Audi BMW Cadillac Ford Lexus Lincoln Mercedes-Benz Convertible Coupe Crossover SUV Luxury Performance bmw m4 mercedes-amg c63

Weekly Recap: Cadillac's crossover blitz hinges on the 2017 XT5

Cadillac's aggressive new cadence of crossovers begins next spring with the arrival of the 2017 XT5, the first of four new utility vehicles that Cadillac will unleash in a bid to win more customers and revitalize its image. The XT5 replaces the aging SRX, and it's the first SUV to use the brand's new naming scheme (cars will use the corresponding CT prefix). Billed as the cornerstone of Cadillac's remade crossover lineup, the XT5 will join showrooms right after Caddy's new flagship, the CT6 sedan. It will be on display next week at the Los Angeles auto show after first appearing this month at the Dubai motor show. "It's pivotal to our ongoing growth, which is why we've developed XT5 from the inside out to provide customers more space, more technology, more luxury, and more efficiency," Cadillac president Johan de Nysschen said in a statement. "Pivotal" is almost understating the XT5 and the red-hot midsize crossover segment. The SRX is Cadillac's top seller in 2015, posting a 25-percent increase and its 56,732 units (up 25 percent) are more than one third of the brand's 141,090 sales this year. Yes, the totals have been partially incentive-fueled, and Cadillac put an average of $7,225 on the SRX's hood in October, according to TrueCar data. Still, it's an impressive performance for any vehicle, especially one that's had few major changes since the new generation launched as a 2010 model. "The SRX has been selling very well, given how late in the lifecycle it is," AutoPacific product analysis manager Dave Sullivan told Autoblog. It outsold the all-new MKX last month and really only trails the Lexus RX. This is the volume model for Cadillac and dealers need this to be a grand slam, not just a home run." Cadillac is adamant the XT5 isn't an SRX re-skin. It has a new chassis, more interior room, and adds features like Apple CarPlay and Android Auto. Thanks to a new structure, the XT5 sheds 278 pounds compared with its predecessor, which should improve fuel economy and driving character. The crossover uses General Motors' latest 3.6-liter V6 rated at 310 horsepower and 270 pound-feet of torque, and it is fortified with variable-valve timing, cylinder-deactivation, and stop-start features. The V6 will team with an eight-speed automatic transmission and a twin-clutch all-wheel-drive system than can summon all of the torque distribution to the front or rear axles. Cadillac will also sell a 2.0-liter turbo four-cylinder model in China.