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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

Cadillac CTS-V spotted with big exhaust, new grille?

If you thought Cadillac was content to leave its twin-turbocharged Vsport as the range-topping CTS, think again. Behold, our first good glimpse at the next-generation Cadillac CTS-V sedan, sporting more aggressive styling (somewhere under there), meaty quad-exhaust pipes, and what very well could be a new face for the V-badged Caddies.
Creating an all-new grille design seems like an awful lot of work just for a prototype, so it's very possible that the vertical-bar treatment you see here could make its way into production. Our spy photographers have pointed out that they've seen this same sort of grille treatment on prototypes for the smaller ATS-V sedan, and we've heard V-series models may soon have greater differentiation from the standard vehicles that sired them - that seems especially necessary if Cadillac insists on expanding this whole Vsport range.
Regardless of how its front end looks, the CTS-V ought to be a real monster. Industry sources say we can expect to see a supercharged version of General Motors' 6.2-liter V8 under the Caddy's hood, and considering the current car already makes 556 horsepower and 551 pound-feet of torque, we wouldn't be surprised to see a decent increase in both of those numbers. After all, one of the CTS-V's main competitors, the Mercedes-Benz E63 AMG, is currently putting out 550 hp and 590 lb-ft of torque. Could this mean a 600-hp Cadillac is on the horizon?

Cadillac confirms new flagship to be built in Detroit next year

"The objective for this upcoming model is to lift the Cadillac range by entering the elite class of top-level luxury cars." - Johan de Nysschen
Cadillac confirmed Friday morning it will build its new flagship sedan, expected to be called the LTS, starting in late in 2015 in Detroit.