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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

Corvette owner finds stolen car, but can't get it back [w/video]

It's not too uncommon to hear about owners being reunited with their stolen cars decades after reporting them missing. The story of Terry Dietrich in Georgia starts that way with police finding her lost 1972 Chevrolet Corvette after over 40 years. However, this case takes a different turn because unless she wants to bid on it, Dietrich's likely not getting the 'Vette back. Just six months after purchasing it in 1972, Dietrich's blue Corvette was stolen in Georgia, and in 1975 the sports car found its way to a man in North Carolina. He kept the car right up until his death just a few months ago, and that's when restorer Gary Green bought the 'Vette from his widow, according to Yahoo Autos. Unfortunately, after acquiring the Corvette, Green found some major discrepancies. For one thing, the listed VIN pointed to a '69 convertible, and there was a different serial number on the frame. Green reported the problem to the local police, and they figured out it was the 'Vette Dietrich lost over four decades ago. Consequently, the cops impounded it. The issue now arises that while Dietrich is the victim of the theft, she isn't technically the car's last legal owner. After the Corvette was stolen, she reported the crime to her insurance company, and it paid on the claim, which essentially forfeited her ownership. To make matters slightly more confusing the company can't find the title on the 'Vette either, according to Yahoo Autos. That leaves the well preserved 'Vette sitting in a police impound lot. It will likely go to auction.

2018 Mazda6, Porsche Panamera and Nissan Titan | Autoblog Podcast #541

On this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Green Editor John Beltz Snyder and Associate Editor Reese Counts. We talk about driving the updated, turbocharged 2018 Mazda6, 2018 Porsche Panamera Sport Turismo 4S Sport Turismo and the 2018 Nissan Titan S 4x4 King Cab. We also discuss aftermarket parts for the Chevy Colorado, pick our favorite 50th Anniversary Hot Wheels and, as always, help a listener buy a new car in our "Spend My Money" segment. Autoblog Podcast #541 Your browser does not support the audio element. Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Cars we've been driving: Mazda6, Porsche Panamera, Nissan Titan The aftermarket takes on the Chevy Colorado 50th Anniversary Hot Wheels Spend my money Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video: Aftermarket Podcasts Chevrolet Mazda Nissan Porsche Car Buying Truck Wagon Sedan Hot Wheels porsche panamera sport turismo