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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

Chevy Malibu rolls over 10 million on the odo

On the cusp on the introduction of the latest model, the Chevrolet Malibu is celebrating a major milestone with 10 million of them now on the road since the car's introduction 51 years ago. While not quite enough to rank among the best-selling vehicles of all time, the feat is impressive considering the name took over a decade off from the Chevy lineup in the '80s and '90s. The Malibu started life in 1964 as the top trim on Chevy's new, midsize model, which also included the 300 and Chevelle. Offered in a plethora of body styles, including a wagon and convertible, the Bowtie brand moved over 370,000 of them in the first year. By 1969, sales reached more than 503,000. However, the market for rear-wheel drive sedans eventually softened in the US, and the Malibu name was dropped in 1983. The moniker returned in front-wheel-drive form in 1997 and has been a part of the lineup again ever since. These days, the Malibu is obviously only available as a four-door, but the model is more efficient than ever. The larger, lighter 2016 example can get up to 37 miles per gallon highway with its 1.5-liter turbocharged four-cylinder or 47 mpg combined when the hybrid goes on sale next year. You can get a great look at the Malibu's changes from the original until now in the gallery above. Related Video: MALIBU MILESTONE: 10 MILLION CUSTOMERS SERVED 31/08/15 Venerable sedan's 51-year legacy strongest in U.S., China and Korea DETROIT – Fifty-one years after it was introduced as Chevrolet's first midsize car, production of the venerable Malibu sedan has crossed the 10-million mark. Chevrolet celebrated the sales achievement today for the global sedan in the United States, China and Korea, which collectively account for more than 90 percent of sales. The Malibu is sold in more than 25 markets around the world. "The Chevy Malibu joins an exclusive club of vehicles that have achieved this extraordinary milestone and we acknowledge it today by honoring the common thread linking every one produced: The customer," said Alan Batey, president, global Chevrolet. "Some people are buying their very first Malibu today and others may have driven a Malibu from a different generation as their first car. It is a car that has resonated with customers for more than half a century." Chevrolet's interaction with customers has evolved since the Malibu was introduced in 1964. Back then, an owner's manual and a personal relationship with the dealer defined conventional customer service.

NHTSA could add 1M cars to GM recall

The Detroit Free Press is reporting that the National Highway Traffic Safety Administration may expand a recall campaign for faulty brake lamps. The agency is currently looking into complaints that certain 2004-2011 Chevrolet Malibu models as well as some 2007-2009 Saturn Aura sedans may have brake lights that do not illuminate when the driver presses the pedal. Alternatively, the lamps may also illuminate without input from the driver. General Motors recalled 8,000 Pontiac G6 models from the 2005 model year for the same problem, and NHTSA is currently investigating whether to add 550,000 more G6 models built between 2005 and 2009 to the list for the same issue.
In addition, investigators are currently examining 97 complaints from Malibu and Aura owners with the same trouble. If NHTSA adds those models to the recall campaign, more than one million units could be covered. GM, meanwhile, says there have been no accidents or injuries as a result of the problem.