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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

Detroit Three's lucrative pickup war intensifies as Ram makes big gains

DETROIT — The battle for profits from sales of large pickup trucks is intensifying among the Detroit Three automakers as sales of small cars in the United States shrivel. For decades Ford has had the single best-selling truck brand in its F-Series trucks. General Motors' Chevrolet brand was a solid No. 2, and Fiat Chrysler Automobiles' Ram was a distant third. Now, that hierarchy may be in flux. Sales figures for December and the fourth quarter released on Thursday show Ram tied with GM's Chevy for the No. 2 spot, as sales of the redesigned Ram pickup surged, fueled in part by demand for an optional 12-inch (30.48 cm) dashboard screen. Chevy not long ago held second place to Ford by a wide margin. GM executives said on Thursday they are bullish on their new GMC and Chevy trucks for 2019.Related: How the Detroit Three's pickups compare on paper 2019 Ram 1500 Laramie review 2019 Chevy Silverado 2.7L four-cylinder review 2019 Ford F-150 2.7L EcoBoost review "There's no doubt this segment (pickup trucks) is one of the epicenters of the auto wars," said Sandor Piszar, director of marketing for Chevrolet at GM. "It's been that way forever, and we wouldn't have it any other way." On Wall Street, investors give electric car leader Tesla a higher valuation than any of the Detroit automakers. But in the nation's heartland, big pickups remain far more popular and profitable than any electric car — and most other consumer vehicles of any kind. Large pickups generate at least $17,000 a vehicle in pretax profit for GM, the company has indicated in disclosures to investors. By contrast, many Detroit Three sedans are so unprofitable, their manufacturers have decided not to build them anymore. 'Hotly contested' Sustaining sales and pricing in the large-pickup segment will be critical in a year when most forecasters expect overall U.S. car and light truck sales to fall. Ford's U.S. sales chief, Mark LaNeve, on Thursday called the F Series "the backbone of our franchise" during a conference call, and added the "segment will continue to be strong, but hotly contested" in 2019. Automakers are banking on pickup truck sales to stay strong even if U.S. interest rates continue to rise. Rising interest rates translate into higher monthly car payments and are expected to deter some buyers in 2019. GM has said 27 percent of Chevrolet and GMC trucks — which can haul trailers by day and substitute for a luxury sedan by night — sell for more than $55,000.

Nissan Frontier and a mid-engine Mustang | Autoblog Podcast #622

In this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by News Editor Joel Stocksdale and Associate Editor Byron Hurd. They discuss news about the 2020 and 2021 Nissan Frontier, as well as a mystery Mustang and classic luxury coupes. After that, they talk about cars from the fleet including Chevy Silverados and the long-term Volvo S60 T8. Autoblog Podcast #622 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 2020 and 2021 Nissan Frontier updates 1966 mid-engine Mustang prototype Personal luxury coupes Cars we're driving 2020 Chevy Silverado 1500 Trail Boss 2020 Chevy Silverado 2500 HD 2020 Volvo S60 T8 plug-in hybrid Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video: