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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

2015 Cadillac ATS Coupe configurator is ready to get personal

If you are in the market for a luxury coupe but would prefer it to be American, then you are in luck because the configurator for the 2015 Cadillac ATS Coupe is now online.
Prices for the Cadillac start at $38,990 (including the $995 destination fee) for the 2.0-liter turbocharged four-cylinder with 272 horsepower and 295 pound-feet of torque, or $46,145 for the 321-hp, 275-lb-ft 3.6-liter V6. Gearbox options include a six-speed manual on some 2.0 models or a six-speed automatic on both of them, and they can be ordered with all-wheel drive for $2,450 to the four-cylinder or $2,600 to the 3.6.
One thing that Cadillac does especially well here is giving customers a plethora of models and options to choose from. Trim level choices include standard, luxury, performance and premium for the four-cylinder or luxury, performance and premium for the V6. There are also 10 colors available, five of which carry an extra premium of $495 or $995. Upgraded interior packages for $1,295 add improved trim and leather, as well.

2018 Cadillac XTS does its best CT6 impression

Although the Cadillac sedan lineup almost exclusively consists of rear-drive sedans, one last bastion of the old front-drive Caddy exists in the XTS. And it looks like the old-school XTS isn't going anywhere, since it just got a refresh that makes it look more like the CT6 and the CTS. This of course is a bit ironic considering the fact that the CT6 will look different in the near future. Until then, though, this update does make the XTS look more up-to-date. The main part of the headlights end higher up on the front fascia, while a strip of LED accent lights waterfall down the front bumper. The grille has slightly more sculpted slats, and the front badge has been scaled down a bit. There are no longer creases that unify the main grille and the lower one in the bumper, which help the car appear lower and wider than the outgoing model. At the back, the license plate position has been moved down to the bumper, and the trunk lid has more lines and creases. The taillights now have horizontal elements that extend toward the middle of the car. The exhaust finishers and the reverse light also look larger and more prominent now. The refreshed XTS also brings a couple of new trim options. There are new wheel designs both in 19- and 20-inch sizes. Inside, XTS buyers will be able to choose from three new color and upholstery combinations. Two of them, however, are exclusive to the Platinum trim level and come with semi-aniline leather seats. There's not really anything new mechanically with the 2018 XTS. The only major change seems to be a new tire design that is quieter and provides a smoother ride. Otherwise, the XTS will remain available with either the standard 3.6-liter V6 making 304 horsepower, or the optional 410-horsepower twin-turbocharged 3.6-liter V6 in the V-Sport model. The standard engine comes with either front-wheel drive or all-wheel drive, and the V-Sport is only available with all-wheel drive. Pricing has yet to be released for the 2018 model year. Related Video: Featured Gallery 2018 Cadillac XTS Image Credit: Cadillac Cadillac Luxury Sedan cadillac xts