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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

Saturn Vue ignition switch leads to new group of GM recalls totaling 312k

General Motors has another spate of recalls to announce. This time they cover 312,280 vehicles worldwide, including 269,041 of in the US, in a total of six campaigns. In 2014, the automaker has recalled 29,079,765 vehicles worldwide, with 25,754,356 of those in the US.
The largest among them covers 215,243 units of the Saturn Vue from 2002-2004 model years worldwide, 202,115 in the US. It's possible for the for the key to be removed even when the ignition isn't in the OFF position. The company knows of two crashes and one injury caused by this problem. Dealers are checking the parts and replacing the ignition cylinder and key set, if necessary.
Next is 72,826 models worldwide (48,059 vehicles in the US) of the 2013 Cadillac ATS four-door sedan, 2013 Buick Encore and 2013 Chevy Trax in Canada. It's possible that the for lap belt pretensioner to retract but not to lock, which could increase occupant movement during a crash. Both front, outboard lap belt pretensioners are being replaced, and a stop-sale is in effect on unsold models until the problem is repaired. There are no known crashes or injuries, though.

Ghostbusters' Ecto-1 detailed in behind-the-scenes video

The Ghostbusters reboot is coming, ready or not. And along with a gender swap between the 'busters and their secretary, the team's trusty chariot, Ecto-1, is getting a refresh. It's still a specialized Cadillac, but that's where the similarities end, judging by the new featurette you see above. Instead of a 1959 Cadillac Miller-Meteor Ambulance, 2016's Ecto-1 is a 1982 Cadillac Deville. And instead of being built to keep people from dying, the new car is meant to transport the dead. Yep, it's a hearse. It's hard not to find some kind of hidden meaning there, but this video doesn't mention it. What we have learned here is that the way the new Ghostbusters acquire their vehicle is a little bit different than it was in the original film. In the 1984 version, Dr. Ray Stantz, played by Dan Aykroyd, bought the 1959 ambulance for $4,800 – the equivalent of $11,000 today – despite a litany of problems. It was clear in the film that Ecto-1 was dilapidated long before the Ghostbusters breathed life back into it. But in the new film, the team acquires Ecto-1 from the uncle of Patty Tolan – Leslie Jones' character. And based on the film featurette, it looks like it's in solid shape before the team adds its distinctive livery and logo. You can learn more about the car, see parts of the build process, and hear the cast and crew talk about it in this two-minute featurette. Ghostbusters hits theaters on July 15. Related Video: