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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

Cadillac Elmiraj Concept slinks in Leno's Garage

Jay Leno's Garage has moved to Pebble Beach for the week. This time around, the affable comedian is taking a look at the Cadillac Elmiraj Concept that debuted during the Monterey car week, and is talking to General Motors vice president of global design, Ed Welburn.
There's plenty of reminiscing about what concept cars were like when these two were kids, before a fairly deep dive into the striking Elmiraj Concept itself. Welburn shares a few anecdotes about the design process behind the two-door concept, including how his designers changed his mind on the grille design.
After bringing up the Cimarron, Leno makes a solid point that the Elmiraj would be a solid production car that could even spawn a four-door variant. We couldn't agree more. Take a look below for the full video from Jay Leno's Garage.

Ford Expedition, F-150 Limited and Cadillac V Series | Autoblog Podcast #583

In this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Consumer Editor Jeremy Korzeniewski and Assistant Editor Zac Palmer. First, they talk about the cars they've been driving, including the Ford Expedition, Ford F-150 Limited and the Mini Cooper JCW Knights Edition. Then they discuss the news, including Ian Callum stepping down from Jaguar, Cadillac's V cars and the latest in the saga between FCA and Renault. Autoblog Podcast #583 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: Ford Expedition Ford F-150 Limited Mini Cooper JCW Knights Edition Ian Callum resigns from Jaguar Cadillac V FCA backs down from Renault merger talks Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video: