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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 Butler announces surprise departure

The Detroit Free Press is reporting that Cadillac's vice president of global strategic development, Don Butler, has resigned. Butler has held the position since April, after a term as vice president of US marketing for General Motor's luxury brand.
As the report explains, the timing here is pretty unfortunate for Cadillac. Butler is the third high-profile member of Cadillac's brass to depart in recent months, following the firing of US sales boss Chase Hawkins and the pending departure of Susan Docherty. Cadillac spokesman David Caldwell told the Detroit paper, "Bob [Ferguson]," global boss for Cadillac, "and other leaders asked him to stay on. Don's here in the office today - and told our team that his decision is purely on a personal level. After three years of putting everything into Cadillac, he is stepping away for some personal time, and to consider new avenues in his life."
Butler says his decision is part of a decision to "recalibrate, reassess my priorities." Whatever the reason, it's an unpleasant surprise for Cadillac, which has been on a surge in 2013, with 30-percent jump in sales on the heels of the hot-selling ATS.

Cadillac highlights craftsmanship in latest Escalade teaser videos

Cadillac, in case you haven't heard, is unveiling the new Escalade on October 7, completing the redesign of General Motors' large SUV range. The event is proceeding with the regular degree of "teasers" and "leaked images" that is typical of the automotive world, nowadays.
As the new Escalade's reveal date grows closer, Cadillac is trumping up interest for the new SUV, debuting five short teaser videos on its YouTube channel. While not showing much about the Escalade itself, the spots reveal plenty about its materials. Real wood and hand-stitched leather are highlighted, while we get another glimpse of the Escalade's vertically oriented headlights. Take a look below for all five spots.