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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

2020 Cadillac CT6 losing the 3.0-liter TT V6?

In April we learned Cadillac would no longer offer the 2.0-liter four-cylinder on the CT6. The same day we heard the news, the CT6 configurator showed that engine option gone, leaving three engines on the menu. That menu could lose another option come 2020, according to a report in AutoVerdict. The site says it got an order guide for the 2020 CT6, and the 3.0-liter twin-turbo V6 won't make it to the new year. That engine was once the top-tier choice, since eclipsed by the detuned 4.2-liter twin-turbo Blackwing V8 imminently available on the Platinum trim. AutoVerdict also read in the order guide that the horsepower figures haven't been finalized for next year's model. As it stands, the entry-level 3.6-liter six-cylinder makes 335 horsepower and 284 pound-feet of torque, the 3.0-liter twin-turbo V6 produces 404 hp and 400 lb-ft, and the 4.2-liter V8 ginning up 500 hp and 574 lb-ft when it arrives. Retiring the middle option ostensibly puts a big ol' gap in output and pricing between the two models left. Right now $24,200 separates the entry-level Premium Luxury from the Platinum. However, since the present Platinum uses the 3.0-liter, it's safe to guess that the 4.2-liter V8 will cost more, creating a larger gap. The Sport model in between uses the 3.0-liter, too. Perhaps that goes away, or maybe it stays and gets further cosmetic upgrades to give it more edge and a higher price. Another change coming to the 2020 CT6 is its induction into Cadillac's metric-unit torque-based badging system. This, remember, converts pound-foot torque into Newton-meters, then rounds up to the nearest 50. That means the 3.0-liter V6 will wear a 400 badge, the 4.2-liter V8 gets an 800T badge - the T standing for turbo. The year's been full of engine rationalizations at General Motors. Theories about the CT6 dropping the 2.0-liter figured it might have been about making space above the CT5, or guaranteeing supply for other GM models that use the engine, like the Cadillac XT4. The folks at AutoVerdict suspect the 3.0-liter TTV6 could be making the move to the CT5, and to the hot-headed CT4-V we'll be getting a look at come the end of this month. Related Video:

Ringbrothers drops more hints about its wild SEMA creations

Ringbrothers isn't finished teasing its SEMA creations. First we got a sliver of rear quarter on a 1969 Chevrolet Camaro that revealed a bundle of carbon fiber and SEMA-obligatory deep-dish wheels. The Wisconsin tuner's now announced its litter of cars headed to the show and a few specs, along with two shadowy drawings. The Camaro, christened with the name Valkyrja and a two-tone paint job, gets stretched in two directions with severe fender flares to widen the body and an extended wheelbase. We're not sure what's happening with the Camaro's snout in the drawing, but under that bulging hood we'll find a 416-cubic-inch LS V8 from Wegner Motorsports. Wegner built the 416-cu-in supercharged LS3 V8 that powered Ringbrothers' 1,000-hp G-Code Camaro in 2016.  The second member of the gang is a 1969 Ford Mustang Mach 1 dubbed Unkl. The exterior begs for attention with a deep blue sea paint job, deep front chin spoiler, bulging hood, yellow brake calipers, and what looks like a racing number inside a roundel on the doors. Unkl gets its motivation from a 520-cu-in Boss V8 built by Kaase Racing Engines, rumored to throw about 800 hp.    Finally, Ringbrothers is bringing its Cadillac Madam V for another Las Vegas go-round after giving the custom coupe some updates. The Madam V is a 1948 Cadillac Series 62 fastback coupe body placed atop an ATS-V chassis, first shown in 2016. The firm didn't elaborate on the changes, so all we can expect for now are the coupe's postwar good looks mixed with new-millennium engineering, and a 3.6-liter twin-turbo V6 with 464 hp under that exceptionally long hood.    For any in attendance at the show, the Valkyrja Camaro debuts at the BASF booth on Tuesday, Nov. 5, 2019 at 9:30 a.m., the Unkl Mustang gets revealed a couple hours later at the Flowmaster/Holley booth, and the Madam V Cadillac will be on display throughout the show at the Ringbrothers booth.