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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

2022 Cadillac CT5-V Blackwing will get carbon fiber seat backs

Cadillac is putting the finishing touches on the 2022 CT5-V Blackwing, the high-performance sedan that will pick up where the CTS-V left off. It announced the model will be available with carbon fiber front seat backs. Presumably found on the list of extra-cost options, the weight-saving carbon fiber seat backs will stand out with a book-matched design and a laser-etched V-Series logo that will remind the passengers sitting in the back that they're not riding in a regular CT5-V. Interestingly, Cadillac noted the seats will also boast "other customer-centric innovations and features" that will be detailed closer to the sedan's on-sale date. Chairs are hardly on the front lines of automotive innovation, so we're looking forward to learning more about what Cadillac has in store. Drivers will have carbon fiber in front of them, too, because the multi-function steering wheel's bottom spokes will be made with the composite material. Cadillac hinted the sedan's top speed will lie in the vicinity of 200 mph. 2021 Cadillac CT5-V Blackwing spied View 15 Photos Nearly everything else we know about the CT5-V Blackwing comes from a diverse selection of rumors, industry murmurings, and spy shots. We learned earlier in 2020 that it might receive an updated version of the 6.2-liter V8 that powered its predecessor, not the 4.2-liter Blackwing engine it's named after, and leaked images strongly suggest a manual transmission will be available, though we assume Cadillac will also offer an automatic. It might be a six-speed stick, or Cadillac could use a version of the Chevrolet Corvette's seven-speed manual. Our questions will be answered when the 2022 Cadillac CT5-V Blackwing finally makes its debut. It's scheduled to go on sale in the summer of 2021, so its unveiling is likely a couple of weeks away, and Cadillac warned availability will be limited. The smaller CT4 which replaced the ATS, is also in line to get the Blackwing treatment.

Cadillac releases updated 2015 CTS

Cadillac is in the process of applying the new wreathless emblem across its range one model at a time, but rather than simply slap the new logo on the existing models, it's taking the opportunity to roll out some revisions as well. First came the ATS coupe, followed by the updated ATS sedan, and now the flagship brand in the General Motors portfolio has quietly announced some revisions for the CTS sedan as well.
For the 2015 model year, the CTS - which was just introduced last year - gets a revised front end with that wreathless crest but also a new chrome grille with active aero elements on standard models and a black-chrome grille on the Vsport. The revised grille is flanked by new headlights, but behind them the engine lineup carries over: a 2.0-liter turbo four with 272 horsepower, a 3.6-liter V6 with 321 hp or - in the Vsport performance model - a 3.6-liter twin-turbo V6 with 420 hp that's still the most powerful V6 GM has ever made. All engines are mated to an eight-speed automatic transmission (ditching the six-speed auto on previous versions) and (apart from the RWD Vsport) can be had in rear- or all-wheel-drive flavors.
Cadillac has also given the updated CTS some new electronics (including inductive smartphone charging, onboard wifi, and more advanced parking and lane assist systems) as well as new wheels, trims and color options, details on which you can read in the press release below.