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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

2018 Cadillac CTS-V gets frosty with 115 Glacier Metallic Edition models

To celebrate the company's 115th anniversary, Cadillac has introduced a special edition of the CTS-V called the Glacier Metallic Edition. Apparently, Cadillac really likes creating special edition models focused on ice and cold. The name comes from the exclusive Glacier Metallic paint, which to us looks like a shade of white, but according to Cadillac, it's actually gray. In addition to the special color, the car also includes the normally optional Carbon Fiber Package and Luxury Package, along with red Brembo brake calipers. It also fits silver and gray forged wheels instead of the black ones the Carbon Fiber Package typically comes with. All the other features, including driving instruction in Las Vegas, are the same as a normal CTS-V. This special edition Cadillac isn't cheap, though. It runs $103,885. Optioning out a regular CTS-V in the same way as the Glacier Metallic model would save you roughly $6,000, and you wouldn't be missing any features. What you would miss out on would be the exclusivity. Cadillac is only building 115 CTS-Vs in this special color. So if you want to stand out -- at least as much as you can with such a subtle color -- the CTS-V Glacier Metallic Edition is the Caddy to buy. Related Video:

Autoblog Podcast #326

Easter Jeep Safari concepts, Shelby 1000, 2014 Cadillac CTS and Mercedes CLA45 AMG leaks
Episode #326 of the Autoblog Podcast is here, and this week, Dan Roth and Zach Bowman talk about this year's Easter Jeep Safari concepts, the 1,200-horsepower Shelby 1000 and leaked images of the 2014 Cadillac CTS and Mercedes-Benz CLA45 AMG. We wrap with your questions and emails, and for those of you who hung with us live on our UStream channel, thanks for taking the time. Keep reading for our Q&A module for you to scroll through and follow along, too. Thanks for listening!
Autoblog Podcast #326: