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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

Watch Brad Pitt's Chinese Cadillac XTS commercial

Once upon a time, in a land not so far from this one, Brad Pitt was the very face anti-consumerism. You see, when he slipped into the role of the elitist-loathing, food-abusing, violence-embracing Tyler Durden from Fight Club, his visage was inextricably married to images of leveling credit card corporations with nothing more than a little human fat and some determination. Of course, that was before Pitt settled into old age with a passel of children at his feet. Now, it seems, he'll shill for something as long as it doesn't damage his reputation in America.
Need proof? Look no further than this Chinese ad for the Cadillac XTS. In it, Pitt contentedly wafts the big front-wheel drive barge around San Francisco against a mildly euphoric soundtrack. You can check out the scene for yourself below, just make sure you have your last meal squarely situated in your stomach before pressing play. We have to wonder if Pitt wakes up in the middle of the night with Chuck Palahniuk's oddly omniscient words echoing in his ears: "Then you're trapped in your lovely nest, and the things you used to own, now they own you."

Ford Edge ST and Mercedes-AMG E 53 | Autoblog Podcast #557

On this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Associate Editor Reese Counts. They talk about driving the Cadillac Escalade, Mercedes-AMG E 53 Coupe and Ford Edge ST. Then they run down the news: Lexus LFA prototype spy shots and the Buick Cascada's death knell. Then Green Editor John Beltz Snyder crashes the studio to talk about reducing your carbon footprint. Finally, the fellas help spend a listener's hard-earned money on a new car.Autoblog Podcast #557 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 Cars we're driving: Cadillac Escalade and Mercedes-AMG E 53 Coupe First drive of the Ford Edge ST Lexus LFA prototype spied at the Nurburgring with new body work Buick Cascada at death's door? Climate change sucks, but it doesn't have to Spend My Money Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video: Green Podcasts Buick Cadillac Ford Lexus Mercedes-Benz Car Buying Used Car Buying Convertible Coupe Crossover SUV Luxury Performance lexus lfa buick cascada