1975 Cadillac Deville Base Coupe 2-door 8.2l on 2040-cars

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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 wants to have 10 plug-in models in China in five years

Last we checked, General Motors was selling all of three plug-in vehicle models in its home country of the US, and is prepared to make the Chevrolet Bolt EV available on these shores later this year. So it's notable that the automaker is hatching plans to have at least 10 plug-in variants for sale in China within the next five years, according to Hybrid Cars. Which plug-ins are coming remains a mystery. GM started selling a hybrid version of the Buick LaCrosse in China this month. The strategy makes sense, as China is now the world's largest car market, and accounts for about a third of GM's annual revenue. The automaker, which operates in China under the SAIC-GM and SAIC-GM-Wuling joint ventures, sells cars there under the Chevrolet, Buick, Cadillac, and Boujun badges, and has been doing so for the better part of two decades. Most recently, GM started selling a hybrid version of the Buick LaCrosse in China this month. What we do know is that GM is building its Cadillac CT6 Plug-in Hybrid in China, with distribution to be split between China and the US. That model, which is scheduled to start sales by the end of the year, is being built overseas because of a combination of Chinese government support for new-energy vehicle technology through incentives and the fact that battery-pack maker LG Chem makes most of its cells in nearby South Korea. The plug-ins are part of a broader plan by General Motors to either introduce or substantially tweak about 60 models by the end of the decade. With such new models, GM looks to boost unit sales by as much as five percent a year for the next few years. As for the other nine plug-in models slated for China by 2021, the company is mum. GM spokesman Dan Flores declined to comment to AutoblogGreen. Related Video: Featured Gallery 2016 Cadillac CT6: First Drive View 32 Photos News Source: Hybrid Cars Green Cadillac Chevrolet GM Electric Hybrid PHEV

Beast mode on the open road: New presidential limo close to delivery

Signs of the Beast have been seen on the open roads around Milford, Mich., home of GM's Proving Grounds. The Beast, in this case, being the nickname for the next-generation presidential limousine. We've seen this car previously in spy shots while parked or driven, going back to January 2016. This is our spy photographers' latest look at the vehicle, and the first on public roads. Which may be a sign that it is almost ready for delivery. It replaces the current Beast, which has been in use since 2009. And "car" isn't exactly the right word for this rig, as it's actually a unique vehicle with Cadillac styling cues custom-built atop a medium-duty truck frame. There may possibly be more than one Beast 2.0 delivered, because two limos are sent anywhere the president goes, to provide a backup or decoy. The grille has touches of the Cadillac Escala concept car, which is heavily influencing Cadillac's evolving future look. But it's what's inside that intrigues everyone. Here's what we know, or at least has long been rumored, about the current Beast and the new Beast 2.0. 1. It has its own airplane. It and its twin follow the president around the globe aboard a C-17 Globemaster cargo plane. 2. It's heavily armored, with 5-inch-thick glass, 8-inch-thick doors that weigh as much as a commercial aircraft door, and its components include titanium, ceramics, and a bombproof plate that covers the underside. As such, the old Beast was estimated to weigh between 14,000 and 20,000 pounds. You can therefore imagine how it got its name. 3. It's equipped like the Batmobile or the Green Hornet's Chrysler Imperial Crown, with run-flat tires and night-vision gear. It can fire gas canisters out the front bumper. 4. It has a diesel engine because of its weight and size (see the gallery below for a sense of scale). And of course, diesel is less flammable in a firefight. The old Beast supposedly gets 8 mpg. 5. Its Secret Service codename is Stagecoach. 6. There's a shotgun by the driver and God-knows-what in the trunk. 7. It supposedly has a stock of blood in the president's type, along with a defibrillator and other emergency gear. 8. And it's pretty nice inside, by all accounts. Since this is not Trump's own personal vehicle and may well serve his successor, let's assume the gold leaf has been kept to a minimum and it's done up in tasteful leather and wood. But then again, who really knows, outside of the Secret Service and a handful of GM engineers.