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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

2017 Cadillac XT5 shows off its new metal in LA

Cadillac is in the midst of a comprehensive production overhaul, and few of its new arrivals will be as pivotal as the new XT5. Replacing the old SRX, the XT5 was revealed in the metal here on the floor of the 2015 LA Auto Show. Joining the new CT6 under Caddy's new naming scheme, the XT5 represents GM's assault on German competition like the Audi Q5, BMW X3, and Mercedes GLC, Japanese rivals like the Lexus RX, Infiniti QX50, and Acura RDX, and its own cross-town nemesis, the Lincoln MKX. And to better fend off their advances, the new XT5 promises marked improvements over its predecessor in every way. The model you see here is, to our eyes, handsomer than the model it replaces, adopting the Art & Science brand's latest design cues. It offers a fresh cabin space loaded with the latest equipment. And it weighs a solid 278 pounds less than the outgoing SRX. Power still comes from a 3.6-liter V6, paired to an eight-speed automatic transmission with available all-wheel drive. 310 horsepower and 270 pound-feet of torque keep it going, which ought to help it keep pace with the competition. We're looking forward to seeing how it drives in due course, but in the meantime, you're invited to view our live photos from the floor of the Los Angeles Convention Center in the gallery above.

New presidential limo spotted in use for the first time

It has been a long lead-up to the new presidential limousine, but now it appears General Motors has "The Beast" in working order for President Donald Trump. The new limo was spotted in public for the first time this weekend in New York City in Trump's motorcade, reportedly on its way to Trump Tower. Said to have been in development since 2013, the $15.8 million armored Cadillac is making its debut as Trump's ride to the U.N. General Assembly this week. The grille suggests looks along the lines of a Cadillac CT6 V-Sport, but the similarities don't go much beyond that. If you look closely, Trump appears to be in the second "Beast" of the twin truck-based Cadillacs that go by in the video. The limo has a diesel engine to propel its near-20,000-pound self down the road, but we couldn't detect much of an oil-burner sound over those gigantic truck tires. This week in NYC will showcase motorcades and fancy presidential limos from around the world, all coming in for the big annual meeting at the U.N. Trump's presidential limos get shipped around the world too because they have their own plane: a C-17 Globemaster cargo carrier. There's no shortage of cool features on the new limo, and we detailed those here. While some of the awesome defense mechanisms are public knowledge, we're sure there are plenty that remain classified. New model presidential limo noticed awaiting Pres Trump at Wall Street heliport. Photo by @stevebruskCNN pic.twitter.com/lEytRcJ9rt — Mark Knoller (@markknoller) September 23, 2018 Featured video: