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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

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.

SRX-replacing Cadillac XT5 spied for the very first time

Cadillac has got big plans in place to revitalize its lineup, with new sedans, coupes and crossovers. And it all starts with this, the replacement for the SRX.
Expected to be called XT5 in line with the brand's new naming scheme, the crossover will be based on a scalable new platform called C1XX - or Chi, for short. In its shorter form, Chi is anticipated to underpin the XT5 as well as a new Chevy crossover and the next-gen GMC Acadia. In long-wheelbase form, the platform is slated to give us a larger Cadillac crossover as well as a new Buick Enclave and Chevy Traverse.
Power in the XT5 will be provided by a choice of turbo four or atmospheric six, potentially to be transmitted through GM's new nine-speed automatic.