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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 highlights craftsmanship in latest Escalade teaser videos

Cadillac, in case you haven't heard, is unveiling the new Escalade on October 7, completing the redesign of General Motors' large SUV range. The event is proceeding with the regular degree of "teasers" and "leaked images" that is typical of the automotive world, nowadays.
As the new Escalade's reveal date grows closer, Cadillac is trumping up interest for the new SUV, debuting five short teaser videos on its YouTube channel. While not showing much about the Escalade itself, the spots reveal plenty about its materials. Real wood and hand-stitched leather are highlighted, while we get another glimpse of the Escalade's vertically oriented headlights. Take a look below for all five spots.

2022 Cadillac CT5-V Blackwing First Drive Review | Peak oil

We may have embraced the coming of electrification. We may love a good, high-performance hybrid or EV. We could quite frankly not care less how a car makes power, so long as the end result is satisfactory. But man, nothing suits a big, square-shouldered American sedan quite like a V8. Question our commitment to Mother Gaia if you must, but the blat of a small block is the bass line in the song of American speed. And now onstage for the V8's farewell tour is the 2022 Cadillac CT5-V Blackwing, a midsize, manual-transmission luxury sedan that comes out swinging with a hand-built, supercharged 6.2-liter V8 making 668 horsepower and 659 pound-feet of torque. The CT4-V Blackwing may be great in its own right, but it's still down a pair of cylinders. The old Cadillac CTS-V (S not 5) was never the slimmest, sharpest or most luxurious sport sedan money could buy, but it always offered excellent performance for its price. It was also one of the few midsize manual transmission holdouts, at least until the third-generation V model debuted in 2016; for its brief run, it was offered only with the eight-speed automatic. Its spirit lives on in the CT5-V Blackwing, but Cadillac refined the formula significantly for its transition to the updated Alpha platform. The manual is back, it gained 28 horsepower and 29 pound-feet of torque, and the aerodynamics and braking were completely overhauled for this, the final iteration of the V8-powered Cadillac sport sedan. Apart from the larger footprint and all that comes with it, most of the Blackwing formula carries over almost unchanged to the CT5-V from its smaller CT4-V sibling. A six-speed manual gearbox is standard with a 10-speed auto available as an upgrade (which it truly is, in some ways). The electronically controlled mechanical limited slip differential, fourth-generation Magnetic Ride Control and various other tweaks made their way here too, but there are a few noteworthy deviations. Let’s start where the CT5-V stops: the brakes. Since the larger, heavier CT5 needs more braking capacity, its wheels grew an inch in diameter to accommodate a bigger set of stoppers. The wheels are wider too, the better to fit its Michelin Pilot Sport 4S tires in 275/35ZR19 (front) and 305/30ZR19 (rear) – 20 mm wider up front and 30 mm wider out back than the 18-inch tires on the smaller CT4-V Blackwing. Exclusive to the CT5 is a carbon-ceramic brake package that reduces unsprung mass by 53 pounds and rotating mass by 62 pounds.