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Facelifted Cadillac ATS spied completely uncovered

The Cadillac ATS makes for a pretty svelte little coupe, and General Motors appears to know it, because multiple, completely undisguised prototype sedans have been spotted testing wearing what look like many of the forthcoming coupe's body parts.
Not only does it wear at least the outline of the brand's new, broader crest, it has the same front air dam with continuous chrome strip found on the coupe. The only real difference is that it has the somewhat taller side view mirrors from the sedan, rather than the narrower, longer ones from the coupe. Around back, the changes are harder to spot because the test car is outfitted with an unpainted lower bumper. However, it seems to lack the chrome strip that offsets the lower portion of the coupe from the sedan.
The ATS sedan is already a looker, but it is good to see Cadillac is taking a second pass using what it learned on the coupe. There's no word yet on when this revised sedan is going to hit the streets - let alone what changes will take place beneath the skin - but we're thinking it looks about right for 2015.

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

Reuss says GM diesel plans are still on pace

General Motors is not going to let Volkswagen's diesel emissions scandal ruin its plans for a new line of efficient, torquey oil-burners, the company's Executive Vice President Mark Reuss said at a recent press event. "No way," Reuss responded when asked about cancelling the upcoming diesel-powered Chevrolet Cruze and other vehicles. "The Cruze Diesel is too good not to do it." Slated for 2017, the compact is just the latest member of a diesel offensive that initially kicked off with the first Cruze Diesel and most recently saw the introduction of the oil-burning Chevy Colorado and GMC Canyon. Reuss also reassured those in attendance that there was "no delay" in development of Cadillac's diesel lineup. Cadillac is working on a line of four- and six-cylinder turbodiesels for Europe. They'd make their way into the US market, too, eventually. "It's a question of timing," Reuss said, according to Car and Driver. Volkswagen's diesel emissions scandal has caused automakers across the globe to at least reanalyze their diesel strategy. Jaguar Land Rover, which is preparing several diesel-powered models for the US market, went on record late last month to reaffirm its commitment to diesel. Related Video: Featured Gallery 2014 Chevrolet Cruze Turbo Diesel: Quick Spin View 14 Photos News Source: Car and DriverImage Credit: Copyright 2015 Seyth Miersma / AOL Green Cadillac Chevrolet GM Diesel Vehicles