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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

GM issues four new recalls, 2.4 million cars affected

General Motors has announced another set of recalls, covering some 2.42 million cars in the United States. For those keeping track, The General has now recalled over 15 million cars worldwide this year due to various issues.
Here's the breakdown for this most recent set of recalls:
1,339,355 - Buick Enclave, Chevrolet Traverse, GMC Acadia models from the 2009 to 2014 model years; Saturn Outlook models from the 2009 to 2010 model years

Cadillac to bolster CT sedans with XT crossovers

Cadillac is moving swiftly to change up its naming scheme. Barely over a week ago we received our first indication that it was considering a different name its the upcoming flagship sedan previously known as LTS. Then Cadillac not only revealed the model would be called CT6, but announced that it would set the stage with a massive overhaul of its model nomenclature. And now we have another piece of the puzzle.
According to Forbes, Cadillac will not only rename its sedans with the letters CT, but will realign its utility vehicles under the banner of XT - both to be followed by a number indicating its place in the lineup. The one exception will be the Escalade, whose nameplate has such a strong following that it would be foolish for Cadillac to cast it aside. That leaves only the SRX (pictured above), but makes room for a new crop of crossovers said to be in the works.
It's a similar approach which Cadillac's new boss Johan de Nysschen took in revising the naming scheme at Infiniti. While it's bound to ruffle some feathers and scratch some heads in the beginning - especially since the company's current flagship sedan is called XTS - it's equally sure to make sense of it all in the long run. All we need to know now is what Nysschen and his marketing chief Uwe Ellinghaus plan to call the coupes.