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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

Reuss says Cadillac CT6-based Buick could happen

Could the upcoming Cadillac CT6 and its Omega platform spawn a Buick variant? According to General Motors' product chief Mark Reuss, it could potentially be in the cards, but "not yet." "We're working on that," Reuss told Automotive News at the 2015 New York Auto Show. While there hasn't been a large, rear-drive Buick on dealerships since the Roadmaster in 1996, the company gave a big hint that it could head in that direction with the Avenir Concept, shown earlier this year at the Detroit Auto Show. As Automotive News explains, a rear-drive Omega-platform Buick could be a real hit in China, where consumers buy 13 Buicks for every one Cadillac. That move would be a big help to GM's bottom line, too, as it'd significantly increase the Omega platform's economy of scale. If a large Buick based on the CT6 were to head to China, though, it likely wouldn't be a simple case of badge engineering (thank God). Reuss hinted to Automotive News that while the mixed-material construction of the CT6 platform "is very flexible," doing an "identical version of that platform or not is a different conversation." What are your thoughts? Should Buick adopt the Omega platform for an Avenir-based sedan? Should that vehicle be sold here in the US, or should it be a China-only offering? Have your say in Comments. Related Video:

Ford C-Max Commercial Brings Cadillac 'Poolside' Ad Down To Earth

If we had tried to predict the first video response to the controversial Poolside video for the Cadillac ELR, we would not have thought it would center on compost. But, hey, it's always nice to be reminded that the real world is sometimes better than fiction. Instead of the chic swagger of 'Poolside,' 'Anything Is Possible' is all about getting dirty. The new short in question is called Upside: Anything Is Possible and it promotes two things: Detroit Dirt and the Ford C-Max Energi. As in the ELR ad, Ford's plug-in C-Max only makes an appearance at the tail end of the spot, but instead of the chic swagger of Poolside, Anything Is Possible is all about getting dirty. The ad stars Pashon Murray, co-founder of Detroit Dirt, which takes natural waste from around Detroit, composts it into soil and then spreads that around "forgotten parcels" of Detroit to create urban farms. Detroit Dirt gets its bio-waste from a lot of sources, including the Detroit Zoological Society (all that herbivore manure has to go somewhere), Ford and General Motors, but this particular ad was the idea of Ford's PR agency, Team Detroit. It was a frenetic shoot, filmed with an LA-based director right after a big winter storm blew through Detroit, and Murray couldn't be happier with the result. "This was Ford Motor Company pushing my story, letting me tell the story that I believe in," Murray tells AutoblogGreen. "I get to help push this car and I get to tell my story." She says that the Team Detroit and Ford had to agree on the message, "from my understanding, [YouTube] is where they wanted to start, not where they wanted to finish." The ad is already getting a positive response on Twitter, so we won't be surprised if it shows up in more places soon. "It's not saying Ford is better than GM. It's telling the story of a black woman who's working hard in Detroit." As Detroit Dirt has off-screen support from both GM and Ford, it's unsurprising to hear Murray say that the video "is not a rivalry thing." She notes that the ad agency Team Detroit came to her and offered to tell the Detroit Dirt story using the framework of the GM ad. "It's a parody on this commercial, but it's not saying Ford is better than GM," she said. "It's telling the story of a black woman who's working hard in Detroit." What is that story? It's about urban farming, recovery and recycling. Murray tells us that for the last seven or eight years, she's been dedicated to sustainability.