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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

GM reports third straight sales drop in China in 2020

BEIJING — General Motors' vehicle sales in China fell 6.2% in 2020, as the U.S. automaker suffered a prolonged slowdown in the world's biggest auto market. GM, China's second biggest foreign automaker, delivered 2.9 million vehicles in the country last year, the company said on Wednesday, for a third straight decline in annual sales. But sales have been recovering in the second half of last year, up 12% between July and September and 14% in the final three months. GM has a Shanghai-based joint venture with SAIC Motor, in which the Buick, Chevrolet and Cadillac vehicle brands are made. It also has another Liuzhou-based venture, with SAIC and Guangxi Automobile Group, in which they make no-frills minivans and have started to make higher-end cars. Sales of its Buick brand grew 4% on the year and Wuling rose 9%, the statement said. Luxury brand Cadillac's sales increased 8%. Sales of GM's more affordable Baojun brand dropped 33% last year, while sales of its mass-market Chevrolet tumbled 30%. GM's delivery of 2.9 million vehicles in China follows 3.09 million vehicles in 2019, 3.65 million vehicles in 2018, and 4.04 million in 2017, for a three-year decrease of 28%.

Cadillac teases CT4 and CT5 V-Series Blackwing steering wheel

There's quite a bit that we know about the upcoming Cadillac V-Series Blackwing models. Thanks to spy shooters and prototypes, we've seen the CT4-V and CT5-V Blackwing out and about testing on public roads, which means we've seen the bronze wheels in staggered sizes. We've been told they will offer proper manual transmissions, and we know they will lap a race track quicker than the ATS-V and CTS-V they replace. And now we know what their steering wheels will look like. It's not much to base an entire teaser on, but there are a few interesting tidbits we can glean from Caddy's first official Blackwing tease. First, the wheel itself. It's leather wrapped (not Alcantra, at least on this example), it looks to have meaty bulges where you'll want to grip it, it has a red strip at the top to help locate straight ahead while driving aggressively, and it has a carbon fiber V-shaped spoke at the bottom. Finally, we see a prominent silver button labeled "V" on the left side that will allow drivers to quickly access V-Mode. To the right will be buttons for the Performance Traction Management system. Judging by the fuzzy background behind the wheel that shows some sort of digital gauge cluster, it seems that Cadillac may be aiming for a 200-mile-per-hour top speed for the CT5-V. That's not a stretch, as the last-generation CTS-V could hit that speed, too. Cadillac smartly took this shot in a way that blurs the center console, which means there's plenty more time to speculate on the transmission choices. Cadillac says the V-Series Blackwing models will be ready in time for the summer of 2021. Stay tuned. Related Video: