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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 previews CT6 interior and its 34 Bose speakers

We get an early monochrome look at the upcoming Cadillac CT6 interior thanks to its stereo system. Bose will debut its Panaray Sound System in the flagship sedan and have 34 speakers located throughout the cabin that will have the occupants bathing in sound. A close look at the interior mock-up shows little visible difference between the CT6 and the praised CTS; the only thing we could find was that the headrests are slightly different and the seat switches have been moved to the doors, a la Mercedes-Benz. As for that Panaray, Bose says it incorporates elements from the company's home and professional audio products, and was designed "exclusively" for this car. We don't know if that means it was tuned for the CT6 or that it will only ever be available on the CT6. Nor do we have any detailed specs on it at the moment, but there's a press release below with a few more tidbits and a high-res graphic above with details on each speaker. Bose Introduces First-of-its-Kind Panaray® Sound System for First-Ever Cadillac CT6 Advanced automotive sound system integrates elements from home products DETROIT, 2015-03-26 – Thirty-five years ago, Bose and Cadillac defined premium automotive audio, forever changing how people listen to music in a vehicle. Now Bose is introducing its most advanced and highest-performing automotive sound system – the Bose® Panaray® system, designed exclusively for the Cadillac CT6 sedan. The 2016 CT6 is a first in its segment, combining the prestige and technology of a range-topping vehicle with the dynamics and efficiency of a smaller one. The Panaray system marks the global debut of Bose Automotive's new line of "Advanced Technology Series" sound systems, integrating technologies and design elements from Bose home entertainment and professional audio products to deliver unprecedented performance in a car. "We asked Bose to create something truly special for this new vehicle: an unbounded sound system, providing an audio experience unmatched in any other luxury automobile," said Travis Hester, Cadillac CT6 executive chief engineer. "Cadillac CT6 customers will be elated by what they hear and feel when they switch on the Bose Panaray system." The Bose® Panaray® system reproduces music with more clarity, precision and deep bass than any system preceding it.

GM claims it's first to sell million 30+ mpg vehicles

As we continue to put together all the data for the year-end edition of By The Numbers, General Motors has announced that it sold more than a million vehicles in the US last year that achieved at least 30 miles per gallon on the highway. More impressively, GM managed this feat using multiple strategies including small vehicle size, turbocharged engines and hybrid or plug-in technologies across four brands (Buick, Cadillac, Chevrolet and GMC) accounting for 13 separate models. This number will grow even more in 2013 thanks to cars like the all-electric Spark, the diesel Cruze, the range-extended Cadillac ELR and the Buick Encore compact CUV.
GM's small car sales were up 39 percent last year helping to attain this million-sales mark for 30-mpg models, and almost 40 percent of all GM sales consisted of cars with fuel-efficient I4 engines. In regards to more advanced means of improving fuel economy, GM says that it plans on having 500,000 vehicles with "some form of electrification" on the road by 2017.
Scroll down for the full list of GM's million 30+ mpg cars as well as an informative press release.