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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

2014 Chevrolet SS makes its live debut

Chevrolet showed off the new 2014 SS in an airport hangar last night, its first rear-wheel-drive performance sedan in the US since the Impala SS from 1997. We'll have more to say about the SS later today, but this is the sedan that Chevrolet sees as the final piece in restoring its performance credentials. For those of you looking for a manual transmission, however, that wish will go unfulfilled - at least for now: the only two options buyers will have are the color and whether or not they want a sunroof.
We'll work on getting some more angles (in better light) today at Daytona International Speedway, but with fans seeing the car for the first time, we don't hold out much luck of getting a clear shot. So for now, enjoy the high-res gallery above.

Nissan recalls 3.5 million vehicles over airbag sensor

Nissan is recalling 3.53 million vehicles globally – 3.2 million in the United States – because the front passenger airbag may or may not deploy properly in the event of a crash. In affected vehicles, the occupant sensing system may not properly register a person sitting in the passenger seat. Passenger-side airbags in roughly 622,000 Nissan Sentra models built between 2013 and 2016 may deploy in crashes when they shouldn't, such as when a child is in the seat. 2016-2017 Nissan Maxima, 2013-2016 Nissan Altima, NV200, and LEAF, 2013-2017 Nissan Pathfinder, 2014-2016 Nissan NV200 Taxi, Infiniti QX60 and Q50, 2014-2017 Nissan Rogue, 2015-2016 Nissan Murano, Chevrolet City Express and 2013 Infiniti JX35 vehicles suffer from the opposite problem. In those models, the airbag may not deploy when it is supposed to. Nissan is aware of at least three crashes where airbags in one of the above models did not function properly, resulting in "moderate injuries." There have already been four recalls since 2013 for similar issues in Nissan vehicles. If you own one of these cars, expect a letter from Nissan in short order (or from GM if you own a Chevy City Express). Related Video: RECALL Subject : Passenger Air Bag may not Deploy due to OCS Error , 1 INVESTIGATION(S) Report Receipt Date: APR 26, 2016 NHTSA Campaign Number: 16V244000 Component(s): AIR BAGS Manufacturer: Nissan North America, Inc. SUMMARY: Nissan North America, Inc. (Nissan) is recalling certain model year 2016-2017 Nissan Maxima, 2013-2016 Nissan Altima, NV200, LEAF and Sentra, 2013-2017 Nissan Pathfinder, 2014-2016 Nissan NV200 Taxi, Infiniti QX60 and Q50, 2014-2017 Nissan Rogue, 2015-2016 Nissan Murano, Chevrolet City Express and 2013 Infiniti JX35 vehicles. In these vehicles, the front seat passenger Occupant Classification System (OCS) may incorrectly classify an adult passenger as a child or classify the seat as empty despite it being occupied. As a result, the passenger frontal air bag may be turned off and not deploy in the event of a crash. CONSEQUENCE: If the passenger frontal air bag does not deploy as intended in the event of a crash, the passenger is at an increased risk of injury. REMEDY: Nissan will notify their owners. Chevrolet City Express owners will be notified by General Motors.