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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

2015 Cadillac ATS Coupe prepares to fight BMW 4 Series

Cadillac introduced its new ATS Coupe at the 2014 Detroit Auto Show today, bringing customers an alternative to the growing range of sport luxury coupes typified by the BMW 4 Series, Audi A5 and Mercedes-Benz C-Class Coupe.
The ATS Coupe, as a slightly more premium offering, ditches the wheezy 2.5-liter engine found in the basic ATS Sedan, but retains the four-door's 2.0-liter, turbocharged four-cylinder and 3.6-liter V6. That four-pot turbo benefits from a fettling that has increased torque from 260 pound-feet to 295, although its peak is only available from 3,000 rpm to 4,600 rpm, unlike in the sedan, where peak twist arrives at just 1,700 rpm and sticks around until 5,500 rpm.
Power can be channeled to either the rear or all four wheels by the owner's choice of a Tremec six-speed manual or a six-speed automatic transmission. According to Cadillac, the new Coupe can get to 60 in 5.6 seconds when fitted with the 2.0-liter turbo.

Junkyard Gem: 1983 Cadillac Cimarron

Ah, the Cadillac Cimarron. Conceived during a time when oil prices were zooming upward and smallish luxury imports such as the Datsun 810 and BMW 320i were stealing Detroit's customers, the idea of a fuel-efficient compact Cadillac made sense. Unfortunately for GM, the Cimarron was an image-tarnishing disaster. Here's a fairly well-preserved '83 that I spotted in a Phoenix self-service wrecking yard. In the words of Pulitzer-winning Dan Neil in his 50 Worst Cars of All Time: "Everything that was wrong, venal, lazy and mendacious about GM in the 1980s was crystallized in this flagrant insult to the good name and fine customers of Cadillac." The Cimarron was a Chevrolet Cavalier with a bit of added bling and a fatter price tag. The Chevrolet Nova-based Cadillac Seville had sold pretty well during the late 1970s, so there was precedent for a small, Chevy-based Cadillac. The hood latch mechanism was broken (of course), so I couldn't shoot any photos of this car's 2.0-liter pushrod four-cylinder engine, rated at 86 horsepower. Here's a GM-produced documentary touting the futuristic design of the '83 Cimarron. The Cimarron Dream. Featured Gallery Junked 1983 Cadillac Cimarron View 12 Photos Auto News Cadillac Economy Cars Classics Sedan