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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 CT5 vs. BMW 3 Series | How they compare on paper

Cadillac just introduced the CT5 sedan at the 2019 New York Auto Show, and it's set to replace both the larger CTS and smaller ATS in the brand's lineup. We have all the details and features for you, in addition to a deep dive with the car's chief engineer, but now it's time to see how it stacks up to the long-time standard bearer in this class: the BMW 3 Series. Now, the car is a bit larger than the completely new 2019 3 Series, but Cadillac says the 3 and the rest of the compact luxury sedan class is its target for this car. We'll dive further into this little conundrum later. This comparison will look at how these vehicles measure up on paper, as we haven't driven the CT5 yet. That will come later, but we're expecting it to be a proper sport sedan competitor with the 3 Series, since Cadillac is building it off GM's dynamically superb Alpha platform. Now let's get on with the comparison. Powertrains and performance Both of these sedans come standard with 2.0-liter turbocharged four-cylinder engines. The BMW four-pot is a bit more potent, coming in with 18 more horsepower and 37 pound-feet of torque more than the Cadillac. Here's our driving review of the BMW. The only upgrade engine for both available initially are turbocharged six-cylinders. BMW offers up its revised inline-six, while Cadillac offers a V6. These six-cylinders are both 3.0 liters. Cadillac bests the BMW in brute torque by 31 pound-feet, but BMW takes the horsepower prize, making 47 more ponies. It's hard to say which car will actually be faster to 60 mph — they'll probably end up being about the same once official numbers are out. This segment used to be one guaranteed to offer a manual transmission, but that's not the case anymore. Neither Cadillac nor BMW will offer a manual to start, but expect to see the stick shift return to higher performance models of each car. For now, they both get torque-converter-style automatic transmissions. One dimension that isn't going away from either anytime soon is rear-wheel drive. Both cars offer rear-wheel and all-wheel drive in every spec available. Fuel economy for the 3 Series is impressive at 30 mpg combined with the four-cylinder. We'll have to wait and see if Cadillac can challenge that figure with its less powerful engine. Size and practicality Here's where a lot of the confusion about the Cadillac CT5 sets in. The CT5 is a tad larger than the 3 Series in its exterior dimensions, but the interior specs are nearly identical.

Cadillac Super Cruise costs $25 per month as a standalone plan

We already knew that Cadillac's award-winning Super Cruise technology package was free for owners of properly equipped vehicles for the first three years. And now we know exactly how expensive it will be to keep the system active after the complimentary period ends. According to a Cadillac spokesperson, the automaker is currently informing CT6 owners in the United States that they can purchase a standalone Super Cruise plan for $25 per month. Alternatively, customers can add Super Cruise to select OnStar and Connected Services bundles for an additional $15 per month over the cost they currently pay for those bundles. In case you're wondering what that monthly payment will cover, the spokesperson added, "The Super Cruise plan enables the map updates and precise GPS corrections required for Super Cruise to function, and also connects the vehicle to an OnStar Emergency advisor in a case where a driver is non-responsive to escalating alerts." As was previously reported, owners of 2018 CT6 models equipped with Super Cruise are getting an additional year of complimentary service, which means they should be prompted to make a decision sometime in 2021. Even if they choose not to renew their Super Cruise plan, features like lane-keep assist and adaptive cruise control will continue to function. Related Video: