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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

Despite De Nysschen saying it won't, Cadillac cuts struggling CTS prices

Ah, well that didn't last long. Not even two years after elevating the price of the then-new third-generation Cadillac CTS by $7,000, the company is now stepping back, telling dealers it will be slashing the price of the 2015 model by anywhere from $1,000 to $3,000. It seems that there are two reasons behind Cadillac's move. First, and most obviously, are its slumping sales, down seven percent last year. That figure is made worse, Automotive News reports, by the seven-percent gain made by the greater luxury market, not to mention gains from fellow American luxury brand Lincoln. Cadillac, meanwhile, also likely faced pressure from its dealer body, which AN reports hasn't been so keen on the price increases. The price reduction is something of a surprise following statements made by Cadillac President Johan de Nysschen shortly after he took office. In September of last year, the 54-year-old exec, who took charge of Cadillac in July of 2014, defended the company's decision to raise prices, telling Automotive News a price cut was "not going to happen." It seems current conditions contradict de Nysschen's statements, though. "We're taking what we've seen are the more desirable optional features for customers and making them more readily available," Cadillac's Dave Caldwell said of the price cut. "Once a car has been on the market for a while, it's not unusual to look at the customer behavior and try to optimize for it." In what's sure to be a pleasant surprise for anyone in the market for a CTS, the most expensive models are getting the biggest price cut, with the price on the Premium and Performance Collection sedans dropping $3,000, AN reports. The 2.0T will get a $2,000 drop, while certain optional extras will now be standard on the Luxury trim, including a panoramic sunroof, navigation and Bose stereo.

2015 Cadillac Escalade gets 8-speed auto, range-topping Platinum Collection trim

The redesigned 2015 Cadillac Escalade is still quite fresh on the market, but the luxury brand has a host of mid-model-year updates for its massive luxury SUV that should make it an even better driver. The range-topping Platinum Collection (pictured above) is also all set to ensconce drivers in leather when it hits the road in the fourth quarter of 2014.
The entire Escalade range now gets an eight-speed automatic to replace the previous six-speed, and four-wheel drive models also get a two-speed transfer case to go along with it. New standard features include a Surround View camera system, 4G LTE connectivity, and the electric tailgate also now closes hands-free, in addition to opening that way.
To make riding in the Escalade an even more luxurious experience, Cadillac is adding a Platinum trim. Exterior changes add even more shine to the behemoth SUV with a grille wearing the redesigned brand crest, additional chrome trim, 22-inch wheels and Platinum badges. However, the interior is where things really get plush. The first and second row of seats are wrapped in Nappa, semi-aniline leather in a choice of either beige or gray. The dashboard, upper door panels and center console also get hand-stitched and wrapped leather, plus a suede microfiber headliner. Both front seats are heated and cooled with 18-way power adjustments, and the driver even gets a massaging function. Rear passengers are hardly left out, either, with 7-inch LCD screens in the headrests and a 9-inch screen in the center.