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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 XT5 caught uncovered during photo shoot

It's only been a few weeks since Cadillac announced that its replacement for the SRX, the new XT5, is on its way. Now, we have images of it out in the open and completely free of camouflage. Obtained by a reader at Jalopnik's Opposite Lock forum, the Caddy was spotted during what user Saw930 believes was a photo shoot in New York's trendy SoHo neighborhood. There's only a pair of images, from the front and rear three-quarters, but it's enough to give us a very thorough overview of the exterior styling on the new CUV. In short, the design language that has been seen on Escalade, CTS, and upcoming CT6 has indeed made its way to the SRX replacement. The broad, egg-crate grille is perhaps the cleanest iteration of Caddy's latest styling, while the CT6-inspired headlights look sharp, as well. Expect a similar headlight pattern to the CTS, with strong LED character accents on the outside of the headlights that integrate seamlessly with the lower DRLs. In back, the taillights curve over the rear haunches and blend into an extremely strong shoulder line. It's a dynamic and aggressive piece of design that we'll need to see in person before signing off on. The rear bumper, meanwhile, is a nicely styled piece, complete with twin, integrated, rectangular tailpipes that flank a piece of (probably faux) skid plating. There's a similar off-road treatment in the front bumper, as well. While we wait for scour for more news on the XT5, have a look at the two images Saw930 captured and posted at Oppo and let us know what you think in Comments.

Cadillac planning its own engines, halo cars

Cadillac is in the midst of some big changes. It's got a new chief executive. It's taking some distance from parent company General Motors and moving to a new headquarters in New York. And it's instituting a new naming scheme that will allow not only for a more clear progression in its lineup, but also for more models. But that's not the end of the story. Not by a long shot.
Speaking with Automobile magazine, Cadillac's new president Johan de Nysschen revealed his intention to develop several new models and powertrains. For starters, he does not want Cadillac to continue borrowing engines from the GM parts bin, but intends to develop a new range of engines specifically for the luxury automaker. The program will likely start with smaller-capacity engines but eventually lead to new V8s as well, taking the place of the long-serving Northstar engine that finally ended its lifespan a few years ago after some two decades of production. Along with other technologies, de Nysschen envisions possibly sharing these powertrains with other GM divisions, but developing them first and foremost for Cadillac.
The bigger question, however, is where those engines would go, and de Nysschen had some thoughts to share on that front as well. For starters, the former Infiniti and Audi exec sees room for an even bigger sedan above the upcoming new CT6 that will cap the current range. Maybe even two of them. But that's not all. Johan wants to see Cadillac get (back) into the sports car game with a new halo model or two - something it hasn't really done since the Corvette-based XLR roadster. A pair of new crossovers are also said to be in the works, flanking the SRX on both sides with smaller and larger models.