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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

40+ cars that barely avoid the gas guzzler tax

The Gas Guzzler schedule, with mpg ratings and charges that haven't changed since 1991, lays out which fuel-swillers owe what to Uncle Sam.
I started thinking about the "Gas Guzzler Tax" - considerably less well known as The Energy Tax Act of 1978 - when I was driving Dodge's new Challenger SRT Hellcat last week. Unsurprisingly for a car that can burn 1.5 gallons of gas per minute at max tilt, theoretically able to empty a full tank of premium in about 13 minutes, the Hellcat will be subject to the Gas Guzzler Tax schedule when it goes on sale.

General Motors Recall List

It seems General Motors can't go more than a few weeks without issuing a major recall. Since the initial ignition lock recall on February 10, over 25 million vehicles have been recalled for defects. It seems General Motors can't go more than a few weeks without issuing a major recall. Since the initial ignition lock recall on February 10, over 25 million vehicles have been recalled for defects. We used the National Highway Traffic Safety Administration recall list to compile a snapshot of all the GM vehicles recalled in the last two months. NHTSA also provides a search engine that allows owners to search for recalls on their vehicle. An automotive company must do everything in their power to notify its customers when a recall is issued on a vehicle. If you own any of the following vehicles and you have questions regarding your car, you can contact Chevrolet at 1-866-694-6546, GMC at 1-866-996-9463, Buick at 1-800-521-7300 and Cadillac at 1-866-982-2339. Or check out General Motor's recall site. Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153) or go to www.safercar.gov. Here's a brief summery of the other vehicles currently under recall: July 26 – 414,333 cars affected NHTSA Campaign Number: 14V447000 Models under recall: Certain model year 2011-2012 Buick LaCrosse, Regal and Chevrolet Camaro, as well as certain 2010-2012 Cadillac SRX, Chevrolet Equinox and GMC Terrain vehicles, equipped with power height adjustable driver and passenger seats. Problem: In the affected vehicles, the bolt that secures the driver's and passenger's power front seat height adjuster may fall out causing the seat to drop suddenly to the lowest vertical position. Consequence: If the driver's seat unexpectedly drops, the distraction and altered seat position may affect the drivers' control of the vehicle, increasing the risk of a crash. Solution: Dealers will replace the height adjuster shoulder bolts, free of charge. July 14 – 16,939 cars affected NHTSA Campaign Number: 14V341000 Models under recall: Certain model year 2011 Cadillac CTS vehicles manufactured October 18, 2010, to June 2, 2011. Problem: In the affected vehicles, vibrations from the drive shaft may cause the vehicle's roll over sensor to command the roof rail air bags to deploy. Consequence: If the roof rail air bags deploy unexpectedly, there is an increased risk of crash and injury to the occupants.