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GM recalling another 2.7 million vehicles in five separate campaigns

The recalls keep rolling in from General Motors, evidently keen to avoid repeating the mistakes of the ignition-switch debacle and clean house. This time they're all coming at once, with five separate recalls announced together covering approximately 2.7 million vehicles.
The largest of the five actions involves over 2.4 million units of the previous-generation Chevrolet Malibu and Malibu Maxx, Pontiac G6 and Saturn Aura in order to fix brake light wiring harness, which have been found to be susceptible to corrosion. The recall is separate from the 56k Aura sedans which GM recently recalled over faulty shift cables, not to mention the previous massive recall of 1.3 million vehicles - some of them the same models - but appears to have resulted from the National Highway Traffic Safety Administration investigation that started with the G6 almost a year ago.
The second-largest campaign involves the 2014 Chevy Malibu, specifically those fitted with GM's 2.5-liter engine and stop/start system, approximately 140,000 examples of which has been found to have problematic brakes. The issue does not appear to be connected to the recall of 8k Malibu and Buick LaCrosse sedans (also involving brake woes) which we reported upon last week. Four crashes have been reported in such models, but GM admits it's not yet clear if the problem was a contributing factor in the accidents.

Meet the next president's new Beast, a giant bomb-proof limo

We don't know who will be our president in 2017, but now we have a better idea of how that person will be transported on land. The next presidential limo, officially referred to as the presidential state car, will be another Cadillac. And a big one. You're looking at a lone spy photo of a car that will be of high interest to actual spies – not to mention Secret Service agents and lots of law-enforcement types. President Obama has been riding around in a Cadillac nicknamed The Beast for a while now. (It recently made an appearance on Comedians in Cars Getting Coffee.) Over the Secret Service radios, it goes by Cadillac One and Limo One. While the current car looks like a stretched Cadillac DTS sedan, it's actually kind of huge and built on a Chevrolet Kodiak medium-duty truck chassis. The same is likely to be true again, but this one will look a lot more like the latest Cadillac models. Through the camo we can see a front end reminiscent of the new CT6 large sedan. Imagine one of those scaled to about 5/3 of the production car and you've got the right idea. Fun fact: It will be the first presidential limo to feature Caddy's new wreathless crest logo on its grille. View 6 Photos As for features, we're in the dark and will remain so even after the new president-mover goes into service. The details are a legitimate matter of national security, but you can bet it's bulletproof, can withstand small bombs, and has some kind of onboard secondary air supply in case of a chemical or biomedical warfare attack. Oh, and it has that big red phone in back in the event things get really bad. The new one will no doubt carry the latest communications and safety technology. The new presidential limousine has been in the works for some time. The government sent out a request for proposals in 2013, and this model is expected to go into service sometime in 2017. Chances are it will make its debut at the inauguration of [INSERT CONTROVERSIAL NAME HERE] in about a year's time. 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