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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's CEO on Apple CarPlay: ’extremely clunky’

In this new world of advanced in-car infotainment and connectivity, car and tech companies alike are creating interfaces with mixed success. Apparently one system has annoyed Cadillac CEO Johan de Nysschen enough he's openly griping about it. In an interview with our friends at Yahoo Finance, the CEO had a number of complaints about Apple CarPlay, a system that, along with Android Auto, is rapidly becoming a staple of automotive infotainment. Though he acknowledged the system's potential, de Nysschen said CarPlay "is extremely clunky." He highlighted issues he's had with Apple Maps reacting too slowly for turn-by-turn navigation on the highway, app transitions that weren't smooth, and some quirks he found when using voice commands. While we won't say Apple CarPlay is perfect by any means, we're also not so sure it's deserving of such high-profile criticism, particularly from Cadillac. This is because Cadillac's own infotainment system CUE, has not been loved by those of us at Autoblog. And while Cadillac has announced it has a new version of CUE that might fix our issues with it, it's not exactly rolling it out expediently. So before ripping on other infotainment, de Nysschen, maybe make sure your own system in order. Related Video:

Cadillac issues stop-sale on recalled CTS, SRX

General Motors has issued a stop-sale order on the Cadillac CTS and SRX, both of which were recalled late last month. Why the stop-sale after all this time? Well, um, GM apparently doesn't know how to fix them.
The stop-sale covers all used Cadillac CTS sedans, coupes and wagons from model years 2003 to 2013, as well as new 2014 coupes and wagons. The SRX crossover stop-sale, meanwhile, only covers used vehicles from model years 2004 to 2006.
Automotive News reached out to GM spokesperson Alan Adler, who told the news pub that the company's engineers were "looking at one common solution" for the affected vehicles, although "they don't have it yet."