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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

2019 Cadillac ATS-V, CTS-V get cool color, weird name

A lot of special-edition cars are really not all that special. They consist of some special paint combo, and maybe a couple of optional features made standard. The Cadillac ATS-V and CTS-V Pedestal Editions are actually pretty much that. But they make up for the mild content list with a really nifty color, great exclusivity and also a weird name. They also help celebrate the ATS-V and CTS-V before they disappear from the line. First let's take a look at the color. It's a shade called Bronze Sand Metallic. It's an earthy, dark brown with a yellow-green tinge to it. We suspect it probably looks more impressive in sunlight, and it's unlike most browns we've ever seen. It's sure to garner attention in any parking lot stuffed with black, silver and white luxury cars. It's matched with sand-colored ultrasuede inserts and bronze-threaded carbon fiber trim on the interior that look sumptuous. Each also comes with carbon fiber exterior trim, red brake calipers, and the CTS-V adds the performance data recorder and Luxury Package. The name really is strange, though. Cadillac says, "The special-edition variants are named in tribute to Cadillac V-Series' time spent at the pinnacle of luxury high-performance." So it seems the thinking was that these cars are up on a pedestal compared with other performance luxury cars. But even in that sentence from Cadillac, there's a word that would be better and more recognizable for excellence: pinnacle. We can think of other great words for marking the peak or the top of performance and luxury, words such as "apex" or "climax." Well, maybe not that one. One of the big appeals of these cars is that there won't be many of them. There will only be 300 built, and that's the total between the ATS-V coupe and CTS-V sedan. The final total for each model will be determined by orders. Ordering opens up on the first week of November, with production coming at the end of that month. The cars will only be available to buyers in the U.S., Canada and the Middle East. There are significant price differences between the two cars. The ATS-V coupe starts at $77,090, while the CTS-V starts at $102,590. That puts the ATS-V at roughly $10,000 more than a base model, and the CTS-V at roughly $12,000 more than its base model. Related Video: Featured Gallery 2019 Cadillac ATS-V and CTS-V Pedestal Edition View 9 Photos Image Credit: Cadillac Cadillac Coupe Luxury Performance Sedan cadillac ats-v

Cadillac to vie for Secret Service armored car contract, new Beast?

President Obama has used the same armored limo since his inauguration in 2008. Known by many as The Beast, the Presidential Limo was provided by Cadillac and earned its nickname in large part because of its massive size, which isn't surprising considering that its Caddy-shaped bodywork is said to sit atop a heavy-duty truck chassis.
It seems the Secret Service may be in the market for a Beast replacement, having issued a request for proposals for a new armored limo. According to Motor Trend, Obama's backup limo is a leftover from the Bush Administration, so it will be interesting to see if this new machine will serve as a replacement for The Beast or for its backup. The contract is to be awarded by September 29, 2013.
The boys from MT contacted Cadillac, Lincoln and Chrysler, and Chrysler is the only one that would confirm that it is not pursuing the contract. Cadillac may have the inside track, as it has provided Presidential limos since 1993, but Lincoln also has a long and storied history of chauffeuring the President.