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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

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.

2016 Cadillac CTS-V prepares to kick ass, take names

Some stories write themselves. This post on the North American International Auto Show debut of the 2016 Cadillac CTS-V is one of them. This 200-mile-per-hour sedan pilfers the 6.2-liter supercharged V8 from the Chevy Corvette Z06, and puts it to the same tire-devastating effect, offering up 640 horsepower and 630 pound-feet of torque. An eight-speed automatic – please join us in a moment of silence for the dearly departed manual CTS-V – then dispatches the force-induced thrust to a very large, sticky set of Michelin Pilot Super Sport tires. To ensure the CTS-V can tear your face off with lateral Gs as well as accelerative Gs, Cadillac stiffened the car's structure by 25 percent, fitted magnetic ride control and fitted the aforementioned tires. Beyond the mechanicals, a substantial rear spoiler, front splitter and diffuser improve grip through aerodynamics. Keeping drivers pinned during all this tire shredding and face tearing is the task of meaty, two-piece Recaro sport seats, which are found in a luxuriously appointed cabin, complete with 4G LTE connectivity, a Bose stereo and Siri Eyes Free. There's even a Performance Data Recorder, which will be on hand to record your miscues if (or perhaps when) the car's extreme abilities outpace your own talents. Take a look at our array of live images from the CTS-V's official debut at the 2015 Detroit Auto Show.