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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

First Cadillac ELR rolls off the line

Gearing up for the Belle Isle Grand Prix this weekend, General Motors invited some of the Chevrolet and Cadillac racecar drivers out to its Detroit-Hamtramck assembly plant. While there, the racers - including IndyCar Driver and Chevrolet Volt owner, Simona De Silvestro - witnessed the very first 2014 Cadillac ELR to roll off the assembly line.
These vehicles are not destined for customers, however, but instead pre-production units will be used by engineers for testing purposes. Actual production of ELR consumer models is expected to commence closer to the end of this year. As a refresher, this range-extended electric Cadillac shares much of its powertrain with the Volt but will have a sportier coupe design inspired by the Converj Concept. De Silvestro manged to snap a few images of here own, which you can see in the gallery below.

Cadillac gives ATS, CTS new V6 for 2016

Replacing the existing 3.6-liter V6 in the Cadillac ATS and CTS is... another 3.6-liter V6. But this one promises higher output, while consuming less fuel, and making less noise. Like the V8s in the CTS-V and Escalade, it's got cylinder-deactivation technology to cut it down to a four-pot under lighter loads, as well as automatic stop/start, and comes mated to an eight-speed automatic transmission. The new engine produces 335 horsepower and 284 pound-feet of torque. That's a modest improvement over the 321 hp and 275 lb-ft mustered by the unit it replaces. But it also delivers an approximate improvement of nine percent in fuel economy and eight percent in carbon emissions. That's what we'd call a win-win, even if it's a modest one. Of course, those ATS or CTS buyers attracted to higher efficiency will still likely go for the 2.5-liter inline-four or the 2.0-liter turbo four. And those more inclined towards performance will be tempted by the 3.6-liter twin-turbo V6 in the ATS-V or CTS Vsport – or the 6.2-liter supercharged V8 in the CTS-V, for that matter. But those customers looking for the best of both worlds will surely be pleased by the improvements the new atmospheric V6 and 8-speed gearbox bring to the table. Related Video: New Technologies Boost Efficiency for 2016 CYLINDER DEACTIVATION AND START/STOP SYSTEMS BEGIN PRODUCTION ON ATS AND CTS PRODUCT LINES 2015-10-09 Renowned for luxury and design, Cadillac has recently added dynamic driving performance to its list of attributes. Now as 2016 model year production begins, Cadillac adds new fuel-saving technologies. Active Fuel Management and Automatic Stop/Start technologies, and widespread use of a new 8-speed transmission, are combining to raise fuel economy ratings and reduce emissions in Cadillac's portfolio. Cadillac's all-new six cylinder engine contains Active Fuel Management, or cylinder deactivation, technology enabling it to seamlessly switch from six-cylinder to four-cylinder operation under certain light-load conditions, while maintaining excellent performance. The new 3.6-liter engine is part of the 2016 ATS and CTS product lines. Additionally, the Cadillac Escalade luxury SUV's V8 will shift to four-cylinder operation in many daily driving conditions, as will Cadillac's all-new high performance CTS-V sedan.