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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 launches ATS-V, CTS-V Crystal White Frost editions

With power and performance enough to challenge the best that Europe and Japan have to offer, buyers in the luxury performance market shouldn't need much more reason to consider a new Cadillac ATS-V or CTS-V. But to make its fastest models that much more enticing, Cadillac is rolling out the new Crystal White Frost editions you see here. Available on the ATS-V coupe, ATS-V sedan, or CTS-V sedan (pictured), the new Crystal White Frost Edition models feature unique matte-finish white paint. They also get special wheels and the Carbon Fiber and Luxury packages as standard. Other equipment like Recaro buckets and microfiber-trimmed control surfaces are also available, among other options. GM's luxury division will only make 99 examples available across the three models – 39 ATS-V coupes, 31 ATS-V sedans, and 29 CTS-V sedans. So if you want to get your hands on one, you may have to act faster than these forced-induction performance machines will muscle their way around the track. Prices start at $71,460 for the smaller sedan and extend up to $94,900 for the larger one – those prices including destination but not taxes, registration, and other fees. For a full rundown of the equipment included and available, scope out the detailed press release below. Related Video: 2016 Cadillac V-Series Crystal White Frost Editions CELEBRATING THE FIRST-EVER CADILLAC ATS-V & THIRD-GENERATION CADILLAC CTS-V 2015-10-16 Cadillac today announced the exclusive Crystal White Frost Edition for all three of its new high-performance V-Series models – the 2016 Cadillac ATS-V Coupe and Sedan, and the 2016 Cadillac CTS-V Sedan. These new special edition models celebrate the ongoing launch of the first-ever Cadillac ATS-V and the third-generation Cadillac CTS-V super-sedan. They feature a special production run of low-gloss Crystal White Frost exterior paint, which first appeared for the world premiere announcements of the new V-Series models, receiving positive consumer reaction. The edition includes select V-Series wheels and Carbon Fiber and Luxury packages that are options on regular V-Series models. The 2016 Cadillac ATS-V Crystal White Frost Edition sedans start at $71,460 and coupes at $73,660. The 2016 Cadillac CTS-V Crystal White Frost Edition sedans start at $94,990, including destination freight charges but excludes tax, title, license and dealer fees.

GM announces 3 new recalls affecting 1.7M vehicles in North America [w/video]

Still embroiled in the ongoing ignition switch recall, General Motors announced today three more discrete recalls, affecting a grand total of 1,546,900 vehicles in the US. The Detroit News reports that some 1.7 million vehicles are affected overall in North America. The first and largest of the trio of new recalls concerns some 1.18-million Buick Enclave and GMC Acadia crossovers from the 2008-2013 model years, Chevrolet Traverse from 2009-2013 (pictured above) and Saturn Outlook vehicles from 2008-2010. All of the crossover utilities may have an issue with the wiring harness for their seat-mounted side airbags. Apparently, the vehicles are equipped with a Service Air Bag warning light that, if ignored, "will eventually result in the non-deployment of the side impact restraints." Those restraints include the side airbags, a front-center airbag if the vehicle is so equipped and seatbelt pretensioners. Dealers of affected vehicles will be instructed to remove driver and passenger side airbag wiring harness connectors, and then "splice and solder the wires together." The second recall affects 303,000 Chevrolet Express (pictured right) and GMC Savana vans from model years 2009-2014, and with gross vehicle weights under 10,000 pounds. Said vehicles do not comply with a head impact requirement for unrestrained occupants, and will need a reworking of the instrument panel material to be sent back on the road. It doesn't sound as though there's a quick fix for this one, as the GM press release states: "Unsold vehicles have been placed on a stop delivery until development of the solution has been completed and parts are available." Finally, the third recall affects 63,900 Cadillac XTS luxury sedans from model years 2013 and 2014. A brake booster pump may be susceptible to corrosion by way of the relay, potentially causing and electrical short, overheating, melting of plastic components and even engine fires. GM says it is aware of two engine fires in unsold XTS models and two cases of melted parts. Repairs for the issues affecting the XTS have not not mentioned by GM in the release. The Detroit News is also reporting that along with news of the triple-recall, GM is taking a $300-million credit to help pay for the repair costs, and to deal with the ongoing costs associated with the ignition switch recall. In an attempt to explain just what GM has been doing in the face of these very serious issues, newly minted CEO Mary Barra has addressed the issues in a new video.