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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

Season 9 of Comedians in Cars Getting Coffee teases us with BMWs and Volvos

Jerry Seinfeld's successful online show Comedians in Cars Getting Coffee is heading into its ninth season, returning January 5th. It should be no surprise that the list of actors and comedians is impressive, with Kristen Wiig, Christoph Waltz, and more making appearances. Seinfeld has lined up an equally impressive list of cars for the new season. Porsche, BMW, and Volvo all have beautiful machines lined up to shuttle Seinfeld and his guest to different coffee shops. As always, it's a mix of light humor packed into a relatively short and, most importantly, free video. Catch up on the previous eight seasons now on Crackle. Related Video: News Source: YouTubeImage Credit: YouTube Celebrities Humor Acura BMW Cadillac Porsche Volvo Convertible Coupe Luxury Performance Classics Videos Sedan trailer jerry seinfeld comedians in cars getting coffee seinfeld

2015 Cadillac ATS Coupe prepares to fight BMW 4 Series

Cadillac introduced its new ATS Coupe at the 2014 Detroit Auto Show today, bringing customers an alternative to the growing range of sport luxury coupes typified by the BMW 4 Series, Audi A5 and Mercedes-Benz C-Class Coupe.
The ATS Coupe, as a slightly more premium offering, ditches the wheezy 2.5-liter engine found in the basic ATS Sedan, but retains the four-door's 2.0-liter, turbocharged four-cylinder and 3.6-liter V6. That four-pot turbo benefits from a fettling that has increased torque from 260 pound-feet to 295, although its peak is only available from 3,000 rpm to 4,600 rpm, unlike in the sedan, where peak twist arrives at just 1,700 rpm and sticks around until 5,500 rpm.
Power can be channeled to either the rear or all four wheels by the owner's choice of a Tremec six-speed manual or a six-speed automatic transmission. According to Cadillac, the new Coupe can get to 60 in 5.6 seconds when fitted with the 2.0-liter turbo.