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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 prices 410-hp XTS Vsport from $63,020*

Cadillac has officially released pricing for the 2014 XTS Vsport. Buyers can expect to pay $63,020 for the fleet four-door, including destination and handling fees. That kind of coin will snag you a twin-turbocharged 3.6-liter V6 good for 410 horsepower and 369 pound-feet of torque. As you likely already know, engineers have done a lot more than simply bolt a pair of turbos onto the company's tried and true naturally aspirated 3.6-liter V6. The engine uses an all-new block, strengthened connecting rods and domed aluminum pistons and is fed through a revised direct-injection fuel system. Combined, the tweaks allow the V6 to suck down 12 psi of boost.
The price tag puts the 2014 Cadillac XTS Vsport well under potential (if ambitious) competitors like the Audi S6 at $71,900, plus destination fees. A base BMW 550i will set you back $62,700, excluding destination charges, but throwing options at the German sedan will quickly see that number climb higher. You can check out the full press release below for more information.

Cadillac upgrades ATS sedan to match new coupe

The big news when it comes to the Cadillac ATS for 2015 is surely the addition of the new coupe model, but that doesn't mean that Cadillac has forgotten about the sedan as well. In fact GM's luxury brand has rolled out a few choice enhancements for the four-door to bring it more in line with the new coupe.
Among those changes that we spotted a couple of weeks ago is a new front fascia that incorporates the brand's new wreath-less emblem, and a sleeker front bumper. The interior has been upgraded as well with new trim options as well as some new tech including Siri Eyes Free functionality, dictated text messaging and optional inductive smartphone charging.
Though the ATS Coupe does away with the base engine, sedan buyers can still opt for the 2.0-liter four with 202 horsepower and 191 pound-feet of torque. The 3.6-liter V6 carries over unchanged at 321 hp and 275 lb-ft, but the 2.0-liter turbo four gets the upgraded torque rating of 295 lb-ft (the highest in the range) to go with its 272 hp. Some new color choices are also among the upgrades you can read more about in the press release below.