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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 sales chief fired over policy violation

Amidst a good year for Cadillac, which is experiencing higher sales gains than any other US brand this year, the US sales chief has been fired over a policy violation, Automotive News reports.
The sales chief, Chase Hawkins, "has left effective immediately," GM spokesman David Caldwell told Automotive News. Caldwell went on to say that Hawkins' replacement would be chosen soon.
Hawkins became the US sales chief in June 2012, and before that was the regional sales director for Cadillac in the Northeast US, overseeing 168 dealerships.

2014 Cadillac XTS Vsport

Not long after bombing around the Milford Road Course in the new CTS Vsport, Cadillac invited me to try out its other new-for-2014 Vsport model: the XTS. And despite using the same twin-turbocharged 3.6-liter V6 from the CTS, the Vsport package takes on a whole new meaning here in Cadillac's softer flagship.
In the CTS, this trim perfectly bridges the gap between the standard models and the hardcore CTS-V, and is focused on being the best-driving version of the range without a standalone V badge. The XTS, however, has no proper V model, so the Vsport becomes the new range-topper for that line by default. But unlike the CTS Vsport, which uses rear-wheel-drive architecture and is focused on driving dynamics above all, the XTS is geared toward a much different customer.
The entire XTS experience is far more concerned with plush comfort than handling prowess, and while this Vsport model certainly ups the ante with more power and some mild suspension and steering tweaks, it's not exactly what we'd call a particularly engaging experience. But that doesn't mean it isn't good.