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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

President Obama will be on Comedians in Cars Getting Coffee

The seventh season of Jerry Seinfeld's excellent Comedians In Cars Getting Coffee will debut on Wednesday, December 30, and if this first trailer is any indication, the guest lineup is damn impressive. But rather than building up to one big guest over the course of the season, the show is starting with one of the biggest guests possible – the president of the United States. President Barack Obama will join Seinfeld behind the wheel of what looks like a 1963 Chevrolet Corvette Stingray for a trip around the South Lawn of the White House. According to CBS, the pair will enjoy their coffee in the staff dining room, which is probably a better idea than crippling Washington, D.C., with a Stingray-led motorcade. Aside from the president, Seinfeld has recruited a couple comedy icons, including first-timers Will Ferrell and Steve Martin. Also appearing are Garry Shandling, Sebastian Maniscalco, and Kathleen Madigan. The four-wheeled stars will include the Corvette, a Plymouth Superbird, a Chevy Camaro, a classic Porsche 911, a BMW 2002, and what we think is a (rather troublesome) 1952 Siata 208 8V Coupe Balbo. You can check out the entire trailer up at the top of the page. News Source: Crackle via YouTube Celebrities TV/Movies BMW Chevrolet Porsche Coupe Performance Classics Videos jerry seinfeld comedians in cars getting coffee cicgc will ferrell

Submit your questions for Autoblog Podcast #316 LIVE!

We record Autoblog Podcast #316 tonight, and you can drop us your questions and comments regarding the rest of the week's news via our Q&A module below. Subscribe to the Autoblog Podcast in iTunes if you haven't already done so, and if you want to take it all in live, tune in to our UStream (audio only) channel at 10:00 PM Eastern tonight.
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