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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

Daily Driver: 2016 Cadillac ATS-V Sedan

Daily Driver videos are micro-reviews of vehicles in the Autoblog press fleet, reviewed by the staffers that drive them every day. Today's Daily Driver features the 2016 Cadillac ATS-V sedan, reviewed by David Gluckman. You can watch the video above or read a transcript below. And don't forget to watch more Autoblog videos at /videos. Show full video transcript text [00:00:00] Hey, it's David Gluckman with another Daily Driver. Today I'm driving a 2016 Cadillac ATS-V. This is the sedan model and it has the optional eight-speed automatic transmission. The ATS-V is the small performance car in Cadillac's lineup. It sits below the CTS-V, which is also new for 2016. Ever since the base ATS came out a few years ago, this has always been a wonderful chassis in search of a great engine to compliment it. This car really changes that. [00:00:30] They've dialed up the chassis, the suspension is a little stiffer, the body is even stiffer, and they've put this really nice 3.6-liter twin-turbo V6 engine under the hood. In terms of power and torque, the new V6 outguns it's main bogey, the BMW M3 and M4. The Cadillac engine puts out 464 horsepower and 445 pound feet of torque, which is tons. [00:01:00] The one issue, though, is the way it delivers that power. It's not as smooth as the BMW and there's a bit of turbo lag that you really don't feel in the German engine. Once you get moving, however, this engine really just wakes up. There's no lag once you're at highway speed. You can floor it and there's plenty of power and torque for easy passes and runup to extra-legal speeds. [00:01:30] It's tons of fun there but around town it just kind of lacks a little bit of the smoothness and responsiveness that we're kind of expecting for a car in this class. The engine does sound pretty nice, though. It has this nice little growl when you start it up and when you get on it, it actually sounds more like a supercharged engine than a turbocharged one. It's a little strange, I think that's maybe some active noise cancellation that Cadillac is doing to cancel out the whooshes and whirs that we're used to from a turbocharger. [00:02:00] That's fine with me. Whatever it is, it sounds good. This car gets the same fancy rear limited-slip differential that the Corvette introduced a couple years ago. It does a really good job of keeping everything manageable. You almost can't tell that the car has 464 horsepower. It keeps everything in line.

Why does this Cadillac fob seem to be for a mid-engine roadster?

Is GM bringing back its Caddied-up Corvette sibling, the Cadillac XLR — only this time based on the mid-engine Corvette? That's the question posed by photos of a wedge-shaped Cadillac key fob someone provided to The Drive. The buttons show a trunk — and also a frunk. So, mid-engine, unless the fob goes with an EV that has its motors and other electrical bits scattered to the wheels and elsewhere. Also, there's a button to operate a droptop. And the car profile on the fob is Corvette-like. All of which makes for some pretty great speculation. Except that Cadillac's way back from the failures of its sedan-centric lineup was thought to be through SUVs such as the new XT4 compact crossover, the XT5 and the somewhere-in-testing three-row XT6. Plus, the XLR, which was produced between 2003 and 2009, hit its sales peak in 2005 of just 3,730 cars, or about one-tenth the sales volume of the Corvette. So it's hard to imagine there's a vast untapped market out there for the luxury roadster — plus the XLR's demographic of well-to-do grandpas is dying off, or at least thinks it is. So a resurrected XLR would seem to be an unlikely savior. A lot's happening with GM's luxury brand — the debut of the XT4 at long last, a new boss, a thinning of the sedan herd but expansion of the V's, a backtrack to Detroit after its New York sojourn, the cash-cow Escalade under direct assault from the fine new Lincoln Navigator, and the impressive performance of its Super Cruise technology. But an XLR? So what is this fob's story? The Drive speculates it's a universal test fob and the buttons don't necessarily mean a thing, or that somebody stuck a Caddy emblem on it just to yank our chains. Who's to say. What would you like it to mean? Related Video: