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NHTSA approves hybrid rearview mirror display in Cadillac CT6, Bolt EV

The Chevy Bolt EV prototype doesn't just have a fancy new all-electric powertrain. Just outside the driver's line of sight is a newfangled rearview mirror, one that can turn into a screen that shows a moving image from the rear-facing camera. Speaking to NPR's Robert Siegel yesterday, Department of Transportation secretary Anthony Foxx said that NHTSA has now approved this type of mirror/screen for use in vehicles. According to a letter from NHTSA to General Motors, GM will likely use this Full Display Mirror first in the 2016 Cadillac CT6 before coming to the Bolt. In its letter to GM, NHTSA said that the Full Display Mirror will only qualify as a standard rearview mirror as long as there are normal side mirrors in place. In other words, don't expect to see cameras and screens replacing all the mirrors in a motor vehicle just yet. @AutoblogGreen @NPR - #NHTSA has OK'd GM rear-view system that can switch between mirror & camera views. pic.twitter.com/6CBeIit10v — Anthony Foxx (@SecretaryFoxx) February 22, 2016 The Full Display Mirror was developed by Gentex, which has long worked with GM. The FDM debuted in 2014 and some people hoped it would also make its way into the Tesla Model X. Gentex, which also makes auto-dimming mirrors, says that it has "set out to develop the technologies and core competencies necessary to manage this evolution of the rearview mirror." The Chevy Bolt EV will start at $37,500, before incentives. The 200-mile EV will go into production late this year for likely sale in early 2017. Related Video:

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

Chevy 'committed to marketing Bolt the right way'

The 2015 edition of the annual AltCar Expo in Santa Monica, CA in September was a relatively quiet affair. Attendance felt light compared to previous years. But that didn't mean there wasn't something happening that might have just as big an impact on the plug-in scene as anything that's ever happened in previous years at the Santa Monica Convention Center. I say this because of what GM's Shad Balch told me about Chevy's plans to market the upcoming Bolt electric car. This is GM's next-gen electric vehicle, which will have a roughly 200-mile range and may cost about $30,000 after tax incentives (maybe). To say he's excited to start selling this car is an understatement. Set aside the obvious challenge Chevy will have with cars named both the Volt and the Bolt, especially when some languages exchange the pronunciation of the letters B and V. Set aside the fact that, for now, Balch is dealing with his own company actively advertising against the product he's trying to get people excited about. Balch, GM's manager of new product and public policy communications, is tremendously positive about the Bolt's chances in the marketplace when it arrives in 2017 or 2018. "Driving an EV is, in every proof point, better than a gas-powered car, except for charging." - Shad Balch AltCar and the concurrent National Drive Electric Week represented the Bolt's West Coast debut, and Balch told me that the car's arrival in California shows how "Detroit recognized that they need to send it out to their number one market." The car's appearance outside of the Motor City was "The most encouraging part for us out here, being in the market ... to be able to explain that we are committed to marketing this car the right way. ... We're trying to make that known as much as possible, because that is the number one criticism that we hear. That's why events like these are so important, because we can't wrap up into a 30-second spot what these cars are capable of. I can't even explain it to you in 10 minutes what it's like. But the thing is, driving an EV is, in every proof point, better than a gas-powered car, except for charging." Now, there's a fairly decent chance that GM will hit the 250,000-vehicle limit for the $7,500 federal tax incentive right about when the Bolt comes to market, so I had to ask how the Bolt gets marketed if the price tag jumps up a few thousand dollars. Balch was straightforward. "Well, we would sell fewer cars," he said. "It's pure and simple. ...