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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

GM recalling 8.4M cars, 8.2M related to ignition problems

General Motors today announced a truly massive recall covering some 8.4 million vehicles in North America. Most significantly, 8.2 million examples of the affected vehicles are being called back due to "unintended ignition key rotation," though GM spokesperson Alan Adler tells Autoblog that this issue is not like the infamous Chevy Cobalt ignition switch fiasco.
For the sake of perspective, translated to US population, this total recall figure would equal a car for each resident of New Hampshire, Rhode Island, Montana, Delaware, South Dakota, Alaska, North Dakota, the District of Columbia, Vermont and Wyoming. Combined. Here's how it all breaks down:
7,610,862 vehicles in North America being recalled for unintended ignition key rotation. 6,805,679 are in the United States.

Book by Cadillac is like a streaming service for cars

Cadillac is launching a subscription-based service that gives users access to most of its models for a flat fee of $1,500 a month. Called Book by Cadillac, the program starts in February in New York City and its surrounding areas. Cadillac's goal: attract users who want flexibility without the costs and commitment of ownership. The monthly fee is steep, but Cadillac argues it's competitive with the cost of leasing a well-equipped luxury car. It also includes maintenance, taxes, and insurance fees. The Book service can also be stopped at any time, which frees users from any payments. There's no restrictions on mileage, though users pay for gas either by filling up the car when they're done with it or through a Caddy concierge who bills their account. Cadillac will deliver and pick up the vehicles from the user's choice of location via a white-gloved driver. Users can change vehicles up to 18 times per year, and they can be reserved with a mobile app. The theoretical goal is a Book user could head to the airport in New York in a Cadillac and reserve another one for their use in Los Angeles. Cadillac ran a test program last year and decided to move forward with Book after receiving a positive response on the price and features. "The overwhelming result is this is something competitive," spokesman Eneuri Acosta said. The program features the Escalade, Escalade ESV, CT6, CTS-V, ATS-V, and XT5 decked-out in Platinum trim. Other vehicles, like the non-V-series ATS or CTS could be added if there's demand. Book by Cadillac starts in New York, but will expand to other unspecified markets. Related Video: