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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

General Motors shaking up its marketing... again

One of the things that dogs the full comeback of General Motors is the instability of its marketing. That part of the automaker got yet another big shakeup today when GM confirmed what I have been tweeting for a few days - strong rumors that the Chevrolet and Cadillac ad accounts are walking to new ad agencies.
Cadillac, GM's luxury brand, is going into review from Fallon Worldwide, Minneapolis and the indications are that Campbell-Ewald, Chevy's old ad shop, will end up with most or all of it. C-E just announced that it was moving from its long-time home in Warren, MI to a new downtown Detroit office next to Ford Field, just blocks from GM.
The other shoe to drop shortly will be the shift of GM's most important brand, Chevy, from Goodby, Silverstein & Partners of San Francisco to McCann-Erickson of Troy, MI. McCann used to be the agency for Buick and GMC, as well as GM's corporate advertising, and has retained some pieces of business over the last few years. Sources have even told us that it was McCann that did a lot of the creative work on Chevy's new ad platform, Find New Roads. (Not to be confused with a former McCann tagline for Saab, "Find Your Own Road.")

Bob Lutz builds the case for a mid-engined Corvette

Rumors of a mid-engine Corvette are like automotive industry folklore at this point. Every once in a while, news pops up that it might be happening or is under development, but nothing actually ever comes to fruition as something people can actually buy. The latest spy shots strongly suggest a mid-engine 'Vette is in the cards, yet again, possibly for 2018. Now, an op ed by former General Motors executive (and definite performance car fan) Bob Lutz in Road & Track gives the inside scoop on the history of one of these proposals and lays out how to make it happen today. According to Lutz, the company's engineers believed the C6 ZR1 was at the limit for front-engine, rear-wheel drive performance in that package, and the only solution was to move the powerplant behind the driver. Lutz even got then CEO Rick Wagoner on board. The scheme made it at least as far as clay models for mid-engine versions of the 'Vette and Cadillac XLR. Eventually, a lack of money got in the way, though, bringing the project to an end. Lutz puts a lot of faith in GM's current leaders, especially Mary Barra and Mark Reuss. He thinks the chances of a mid-engine 'Vette happening this time are better than 50 percent. The model, rumored to be named Zora, could offer over 700 horsepower in an ultra lightweight body and be priced at about $120,000 to "suck the doors off everybody." Head over to Road & Track to get some insights from this highly respected and entertaining auto industry veteran. Related Video: