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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 Escalade gets $5,000 discount to ward off Lincoln Navigator

General Motors apparently isn't going to let early good reception for the redesigned Lincoln Navigator steal thunder from its own luxury SUV without a fight. It's offering a $5,000 discount on the purchase or lease of the Cadillac Escalade this month to any buyer who trades in a 1999 or newer Lincoln model, Bloomberg reports. GM spokesman Jim Cain told Bloomberg the incentive is being offered to keep prices competitive for the Escalade. The 2018 Navigator starts at $72,055, compared to $73,995 for the Escalade, but the outgoing version of the Navigator is selling for an average of around $53,000, compared with more than $80,000 on average for the Escalade, he said. The Escalade was the top-selling domestic luxury SUV in October and No. 4 in the segment, according to Motor Intelligence. It far outsold the Navigator, which last saw a refresh in 2015 and a full redesign in 2007. But Ford is hoping to gain back some ground with the new Navigator and updated Expedition, which also trails the Chevrolet Tahoe and Chevy Suburban in its segment. Bloomberg notes that one Morgan Stanley analyst estimates that GM owns a $2 billion annual pretax profit edge in the lucrative luxury sport utility segment. Our recent First Drive review called the new Navigator "far superior to its primary competitor, the Cadillac Escalade."Related Video:

GM delivers best Q3 sales since 1980, 2.4M vehicles sold

People are a weird sort. Even after registering over 70 recalls through the first three-quarters of 2014, General Motors saw its best Q3 results since Jimmy Carter was in the White House, registering over 2.4 million global sales between June and September on the back of strong results in the US and China.
US sales were marshaled by good results for GM's pickups, the Chevrolet Silverado and GMC Sierra, which bumped the manufacturer's truck market share to 35.6 percent, up nearly three points from Q1 2014. Buick has seen healthy growth as well, with the Encore dominating its segment for the sixth month running.
It was China, though, that really bolstered GM's sales, as the company's efforts to top last year's record-setting 3.16 million units continued apace. Small SUV sales saw massive growth, with Encore, Chevrolet Trax and Captiva figures jumping 90 percent in Q3. Brand-wise, Chevrolet, Cadillac and Buick all saw sales gains in the PRC, with each recording double-digit year-over-year jumps. Cadillac sales alone were up 63 percent compared to the first nine months of 2013.