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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 Offering $100 For Test Drives

The video meant to be presented here is no longer available. Sorry for the inconvenience. Cadillac is hoping to jumpstart sluggish sales with a generous offer to customers to get them into dealerships and perhaps behind the wheel of their very own Caddy. Cadillac is giving a $100 gift card to any insured car owners age 21 or older who drive non-GM vehicles built after 2004, WDIV reported. If you buy a Cadillac, the automaker is offering an additional $1,500 plus other incentives. Such sales promotions have worked well in the past, analysts told The Detroit News. Cadillac had strong sales last year, but sales are down 7.3 percent this quarter compared to the first quarter last year. Cadillac will run the promotion until the end of the month. Related Gallery AOL Autos Test Drive: 2014 Cadillac ELR Cadillac Car Buying Car Dealers

Hear the new Cadillac CTS-V torture some tires

The 2016 Cadillac CTS-V seems like the type of wonderful gift that Santa might cook up in his workshop for one extraordinarily good boy or girl. However, the first chance for most people to actually see the super sedan and its carbon fiber pieces in real life is at the 2015 Detroit Auto Show in January. As a stocking stuffer until then, Caddy has released this video highlighting the latest V-Series roasting its tires better than any dinner for the holidays. With the supercharged 6.2-liter V8 from the Chevrolet Corvette Z06 nestled into the CTS-V's engine bay, the Cadillac certainly has quite a bark coming from its exhaust. The mill might be detuned slightly from the 'Vette to 640 horsepower and 630 pound-feet of torque, but that's still plenty for this smoky application. Enjoy this tease of the future V-Series, ahead of the Detroit show. Related Gallery 2016 Cadillac CTS-V View 15 Photos News Source: Cadillac via YouTubeImage Credit: Related images copyright Cadillac Cadillac GM Luxury Performance Videos Sedan