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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

Best and Worst GM Cars

Oh yes, because we just love receiving angry letters from devoted Pontiac Grand Am enthusiasts, we have decided to go there. Based on a heated group Slack conversation, the topic came up about the best and worst GM cars. First of all time, and then those currently on sale, and then just mostly a rambling discussion of Oldsmobiles our parents and grandparents owned (or engineered). Eventually, three of us made the video above. Like it? Maybe we can make more. Many awesome GM cars are definitely going unmentioned here, so please let us know your bests and worsts in the comments below. Mostly, it's important to note that this post largely exists as a vehicle for delivering the above video that dives far deeper into GM's greatest hits and biggest flops, specifically those from the 1980s and 1990s. What you'll find below is a collection of our editors identifying a best current and best-of-all-time choice, plus a worst current and worst-of-all-time choice. Comprehensive it is not, but again, comments. -Senior Editor James Riswick Best Current GM Vehicle Chevrolet Corvette We were flying by the seats of our pants a bit in this first outing and my notes were similarly extemporaneous. When it came time to tie it all together on camera, I failed spectacularly. Thank the maker for text, because this gives me the opportunity to perhaps slightly better explain my convoluted reasoning. I chose the C8 Corvette because it's simply overwhelmingly good, and it's merely the baseline from which this generation of Corvette will be expanded.  While the Cadillac CT5-V Blackwing (more on that in a minute) is an amazing snapshot of GM's current performance standing and its little sibling so enraptured me that I went out and bought one, their existence is fleeting. Corvette will live on; forced-induction Cadillac sport sedans, not so much. So while all three are amazing machines when viewed in a vacuum, the Corvette stands above them as both a reflection of GM's current performance credentials and a signpost of what is to come. So, given the choice between the C8 and the 5V-Blackwing right now, I'd choose the C8. In 10 years, when the Blackwing is no longer in production and Corvette is in its 9th generation? Well, that might be a different story. Now, just pretend I said something even remotely that coherent when we get to the part of the video where I try to make an argument for the 5-V Blackwing as best GM car I've ever driven. Or just laugh at me while I ramble incoherently.