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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 XT4 crossover reveals its lighting

The upcoming Cadillac XT4 compact crossover has once again been spotted, this time with less camouflage and an update to its lighting. Specifically, the little crossover is sporting production lighting front and rear, and it's sure to make the luxury SUV one of the boldest-looking Cadillacs. Part of the reason for this comes from the taillights. As we suspected from the last set of spy shots, the XT4 will have highly distinctive lights that run the full height of the C-pillar. Though it's a similar design to that of the Escalade, it's made more interesting by the significant forward rake of the rear pillar. Not only that, but that pillar is quite thick, too. The look is actually reminiscent of the old CTS wagon. Moving around the side, the reduced camouflage reveals that the doors and quarter panels are fairly conservative and lacking in many creases or bulges. We can make out the edges of what will likely be black plastic fender flares and rocker panel cladding. Finally reaching the front, we see that the headlights are similar to those of many current Cadillacs, including the recently refreshed XTS sedan. The main part of the lamp starts high up and is slightly horizontal like the Escala concept, but they extend over the fenders and a strip of LEDs descends down the front. A previous report noted the XT4 will be built in Kansas on the Chevy Malibu platform. That means it will be a front-drive-based vehicle likely offering both front- and all-wheel-drive. Under the hood will probably be at least one turbocharged four-cylinder engine, with a second, more powerful upgrade option a possibility. We expect to see the fully revealed model to show up by the end of 2018. Related Video: Featured Gallery Cadillac XT4 spy shots View 15 Photos Image Credit: Brian Williams Spy Photos Cadillac Crossover SUV Luxury cadillac xt4 cadillac xt3

GM Design shows what could have been and what might be

We periodically like to check in with GM Design's Instagram account to see what they're cooking up. Even better is when we catch a glimpse of an alternate history of what legendary designers from The General's past were thinking, though those ideas may not have made it into production. This week, for example, the account posted some illustrations from George Camp, whose career at GM spanned nearly four decades, from 1963 to 2001. One of the renderings is of what appears to be a 1971-72 Pontiac GTO Judge, but with two headlights instead of the production unit's quad beams. The rear departs from the canonical version most dramatically, with a massive integrated wing. Other bits that didn't make the production cut include large side vents, a gill-like side marker and rectangular intakes below the headlights that wouldn't be out of place on a modern design today. Amazingly, from what we can make out of the date, it appears that the drawing was done sometime in 1965, which makes it quite prescient.           View this post on Instagram                       A post shared by GM Design (@generalmotorsdesign) There's also a very aerodynamic interpretation of a Corvette ZR-1. To our eyes it splits the difference between the 1986 Corvette Indy concept and a fourth-generation F-body Pontiac Firebird, so perhaps parts of Camp's work on this sketch did make it into physical form. There's also a radical sports car concept from May 1970 that resembles the Mazda RX-500 concept from the same year, a Syd Mead-looking Cadillac coupe, and an Oldsmobile with a cool take on the company's trademark waterfall grille and elements of the Colonnade Cutlass at the rear. Other recent posts include a FJ Cruiser-like off-road EV, a sleek coupe with the Chevy corporate grille, and a rendering of a Silverado-esque pickup that looks far better than the current production version.           View this post on Instagram                       A post shared by GM Design (@generalmotorsdesign) It's pretty easy to lose hours in the account, but it's always fascinating to see GM's visions of what could have been and what might be. Related Video: