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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

New Forza Horizon 2 pack features Chevy Monte Carlo SS, Audi RS6 Avant [w/video]

The latest car pack for Forza Horizon 2 is hitting Xbox Live today, giving Xbox One owners a shot at six new vehicles that date back to 1970. Leading the charge in the hearts and minds of the Autoblog staff is, of course, the 1988 Chevrolet Monte Carlo SS, one of the most 80s-tastic performance coupes of its time. Chevy's 80s-era NASCAR representative is joined by another General Motors performance two-door, in the form of the 1970 Buick GSX. Complete with a 455-cubic-inch V8, the GSX could best be thought of as the grandpappy to the iconic GNX of the late 1980s. Crossing the pond, we have a trio of offerings from the United Kingdom, with the 2002 Lotus Esprit V8, the redesigned, aluminum-intensive 2014 Land Rover Range Rover Supercharged and finally, the 2015 McLaren 650S. The mid-engined offerings should be a riot on the winding roads of Forza Horizon 2's European locales, while the Range Rover should make cross-country efforts an absolute breeze. Finally, virtual wagon lovers will be able to enjoy the 2015 Audi RS6 Avant and its combination of Quattro all-wheel drive and a twin-turbocharged V8. As per usual, this latest car pack will be available to gamers for $5 while season pass owners will score the sextet of vehicles for free. Scroll down for a video of the new offerings in action, as well as the official press release from Turn 10 Studios. "Forza Horizon 2" NAPA® Chassis Car Pack Now Available The roads and countryside of "Forza Horizon 2" beg for you to leave your mark on them. The NAPA® Chassis Car Pack for "Forza Horizon 2" on Xbox One has arrived, bringing five amazing new cars to blaze trails, break records, or just enjoy a casual cruise in. First off, the new McLaren 650S Coupe's uncanny acceleration and preposterous top speed will satisfy the elitist in you. If you want get away from it all, there's no better way than in the Supercharged Land Rover. Need muscle? Take the classic form of the Buick GSX or the later model Monte Carlo SS for a spin. We all need more wagon in our lives and the Audi RS6 is ready to run around town or serve up surprises at the track. The NAPA® Chassis Car Pack for "Forza Horizon 2" on Xbox One is available today for $5 in the Xbox Live store. Starting today, also available this month for free for all Xbox One players is the 2002 Lotus Esprit V8.

General Motors Recalls Nearly 780,000 Cars To Fix Deadly Problem

General Motors is recalling nearly 780,000 compact cars in North America because the engines can shut down unexpectedly and cause crashes. The company says six people have been killed in crashes related to the problem. The recall affects Chevrolet Cobalts and Pontiac G5s from the 2005 through 2007 model years. U.S. safety regulators say the weight of the key ring and rough roads can move the ignition switch out of the run position, cutting the engine and electricity. If that happens, air bags may not work. GM says there have been 22 crashes from the problem. All happened at high speeds. Dealers will replace the ignition switch for free. GM says owners should remove nonessential items from key rings until the problem is fixed. Related Gallery Chevy Impala Earns Highest Accolades From Consumer Reports Recalls Chevrolet GM Pontiac Cobalt