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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 caught testing the upcoming XT3 SUV again

Days ago, the Cadillac XT3 was caught covered in more black plastic bags than an average Home Depot can hold. Now, more photos have surfaced of the compact crossover doing cold weather testing, still wearing binliner camo. There are still details that can be detected from underneath all the make-up, as the car wears a familiar Cadillac grille and edgy LED headlights. The rear shots do show tail lights fashioned into the camouflage, but those might be there just to throw everybody off: the C-pillars have lights way up from the usual spots, and that might be the location for the actual tail lights, giving the car characteristically narrow Cadillac style lighting in the rear. To match the German competition in this segment, it is likely that the XT3 will be powered by four-cylinder turbocharged engines, and the intercooler under the front bumper can be a confirmation of this. Featured Gallery Cadillac XT3 Winter Spy Photos View 10 Photos News Source: CarPixImage Credit: CarPix Spy Photos Cadillac SUV cadillac xt3 cadillac crossover

2015 Cadillac Escalade blings its way into LA

The new Cadillac Escalade sauntered out onto the Los Angeles Auto Show stage, showing off its new familial face and redesigned interior. That exterior, with its slim, wrap-over headlights and tall, vertical taillights (both made up of LEDs) is a subtle but significant departure from the past styling of General Motors' flagship SUV.
And while there's no shortage of stuff to discuss about the Caddy's exterior, its cabin is where the big changes happen. Aside from the column-mounted shifter, the cabin receives a heavy going-over, receiving Cadillac's new CUE infotainment system and a significant upgrade to the materials. Comparing it to furniture, Eric Clough, Cadillac's director of design for interiors, said, "An exceptional level of craftsmanship has gone into the redesign of the 2015 Cadillac Escalade, and it all centers on the premium materials and extensive use of cut-and-sew live stitching."
Under hood sits a 420-horsepower, 460-pound-foot, 6.2-liter V8. Fitted with direct injection and active fuel management, fuel economy for the big Escalade should get a much-needed boost beyond the current model's 14-city and 18-highway miles per gallon, although official numbers haven't been published quite yet. A six-speed automatic is the sole gearbox choice. Cadillac has also fitted the new Escalade with GM's magnetic ride control system, which should deliver a more refined ride than its predecessor.