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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 Peffer resigns amidst slow sales

Cadillac continues to hemorrhage executives, as it's just seen its fourth high-level departure in the past year. Vice President of Global Strategic Development Don Butler (who defected to Ford) and European President and Managing Director Susan Docherty both left the company of their own volition, while Chase Hawkins, Cadillac's vice president of sales and service, was fired following a "violation of policy" in July of 2013. Strangely, it's Hawkins' replacement, Bill Peffer (shown above), who has handed in his papers this time around.
"Bill left to pursue other interests. Kurt McNeil replaces him, effective immediately," spokesman David Caldwell told Autoblog via email.
McNeil last held the VP of sales and service position back in 2012. He's currently the vice president of US sales for all of General Motors. According to The Detroit News, McNeil will take on the post in what is likely an interim capacity.

Cadillac V-Series Academy comes to Las Vegas [w/video]

General Motors has added another high-speed education course to the curriculum at the Spring Mountain Motorsports Ranch outside of Las Vegas, Nevada. The desert track already hosts the Ron Fellows Performance Driving School with Chevrolet Corvettes, including the ZR1, and they've just added the Cadillac V-Series Academy.
Open now, the one- and two-day performance driving school teaches "the finer points of high performance driving" using the 556-horspower instructional aids known as the CTS-V sedan, coupe and wagon. This is different than than using the CTS-V at the Monticello Motor Club on the east coast - that's part of a sponsorship deal that Cadillac has with the track. The driving course at the Motorsports Ranch is its own program that was developed by Fellows, and we have no reason to think the Cadillac edition won't be just as thorough and enjoyable as the one with Corvettes.
Unlike the 'Vette edition, however, it doesn't appear that you get an invitation to the program if you buy a CTS-V model. Classes are capped at 12 participants and run $1,295 for a single day, $2,295 for two days. There are a video and a press release below with more info.