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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 confirms Blackwings will get manual transmissions and 3D-printed parts

Cadillac's upcoming 2022 CT4-V and CT5-V Blackwing will be the first GM production cars to utilize 3D-printed technology. In fact, the technology will be featured front and center on one of the cars' most hotly anticipated features — in a decorative medallion atop the shift knob of the manual transmission. Cadillac says that "additive manufacturing" (named as such because 3D printing accumulates tiny deposits of material to create the object) made the manual transmissions possible by reducing costs and waste. Aside from the medallion, the cars will employ two 3D-printed two HVAC ducts and an electrical harness bracket. "[The manual transmission is] something we know V-Series buyers want and itÂ’s something we knew we had to have, so we used innovative processes to make it happen,” said Cadillac performance variant manager Mirza Grebovic. Speaking of which, Cadillac commissioned a Harris Poll survey about manual transmissions and received some interesting results. For example, 66 percent of American adults surveyed know how to drive manual, and 55 percent said they've owned a standard shift car. Of those who don't, roughly 40 percent are either somewhat or very interested in learning. Interest is highest among two key demographics, 64 percent of those earning $75,000 or more in annual household income, and 62 percent of those ages 18-34. The findings seem to contradict what many automakers have said about lack of interest in manuals, with some declaring a sub-1 percent take rate when manuals are offered. Perhaps with a performance-oriented car such as the V-series, buyer preferences change. The mix of old school gearboxes and new school manufacturing techniques will result in what looks like a very potent car on paper. The CT5-V Blackwing is rumored to be powered by an updated 6.2-litter V8, while the CTS-4 Blackwing is said to be motivated by a turbo six. Neither will use the twin-turbo 4.2-liter V8 of their namesake, but they should prove to be worthy successors to the CTS-V and ATS-V. Related Video:

GM Super Cruise beats Tesla Autopilot again in latest hands-free test

DETROIT — General Motors' Super Cruise once again edged Tesla's Autopilot in an evaluation of 17 vehicles equipped with active driving assistance systems (ADAS) by Consumer Reports, the testing organization said on Wednesday. A Tesla Model Y fitted with Autopilot finished "a distant second," the group said, to a Cadillac CT6 equipped with Super Cruise, which GM is rolling out to more than 20 vehicles — including its new Hummer electric pickup truck — over the next three years. Safety and insurance researchers have frequently warned of the risks of consumers overestimating ADAS systems' abilities, a misconception increased by some automakers calling their products Autopilot, ProPilot or Co-Pilot. In 2018, the Cadillac CT6 with Super Cruise scored higher than a Tesla Model 3 with Autopilot, in a Consumer Reports test of just four vehicles equipped with ADAS. In the latest test, conducted this summer on a track and on public roads, the Cadillac scored 69 points out of a possible 100, while the Tesla scored 57. A Lincoln Corsair equipped with Ford's Co-Pilot 360 system, finished third with 52. The critical difference in the Super Cruise system is a driver-facing infrared camera to make sure he or she is paying attention to the road and is ready to take over manual control when necessary, said Kelly Funkhouser, head of connected and automated vehicle testing at Consumer Reports. The group noted that Autopilot can shut off abruptly in some situations, while Super Cruise did a better job of notifying the driver when the system is disengaging. In recent European safety testing, a Tesla Model 3 with Autopilot placed sixth out of 10 systems, getting high marks for performance and ability to respond to emergencies, but falling short on its ability to maintain a driverÂ’s focus on the road. Related Video: Green Cadillac GM Hummer Tesla Safety Technology Autonomous Vehicles Electric Super Cruise