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Canada opens probe into 250,000 GM pickups, SUVs over brake performance

Transport Canada, the auto safety regulator, has opened a probe into braking issues in nearly 250,000 General Motors full-size pickups and SUVs after U.S. officials launched a similar probe last year, the agency said on its website. The U.S. National Highway Traffic Safety Administration (NHTSA) in November into 2.73 million U.S. 2014-2016 model year SUVs and pickups after receiving 487 reports of hard brake pedal effort accompanied by extended stopping distance that were attributed to deterioration of the engine-driven brake assist vacuum pump. Transport Canada's probe covers 249,700 2015 through 2017 model year vehicles including the Cadillac Escalade, Chevrolet Suburban, Chevrolet Tahoe and GMC Yukon as well as 2014-2017 Chevrolet Silverado LD and GMC Sierra LD vehicles. The U.S. agency said it had reports of nine incidents of vehicles incurring damage as a result of colliding with another vehicle or fixed object at low speeds and reports of two injuries. NHTSA said if the pump fails to operate, the amount of brake power assist can be significantly reduced, extending vehicle stopping distance. The NHTSA sent GM an information request in a Feb. 7 letter. A GM spokesman said he had no update on the investigation. Reporting by David Shepardson; editing by Jonathan Oatis

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

All-new 2019 Cadillac XT4 crossover debuts in New York

Cadillac spent years and years improving its mainline sedans, the CTS and ATS, turning them into awfully good impressions of BMWs from a few years before. The thing is, great sedans aren't selling, and crossovers sure are. Cadillac's XT5 is the only crossover in the lineup, something that's had American Cadillac dealers gnashing their teeth and wailing — although anyone they can upsell into an Escalade can staunch the bleeding. That brings us to the new XT4, which is smaller than the XT5 but even sharper than its bigger sibling. Let's take a closer look at this new two-row luxury crossover. For one, it's based on what Cadillac calls a unique platform. That may be true, technically, although it's likely related to the Equinox/Terrain on some level. Platforms are becoming quite flexible: Look at Volkswagen's MQB, under everything from Euro hatches smaller than our Golf to the three-row Atlas. Whatever else it is underneath the skin, all XT4s will share one powertrain: the corporate 2.0-liter turbocharged inline-four, paired to a nine-speed automatic transmission. View 14 Photos The engine puts out a healthy 237 horsepower and 258 pound-feet of torque, putting it just a hair underneath its closest domestic rival, the Lincoln MKC with the 2.0-liter EcoBoost. Of course, the 2.3-liter MKC beats the XT4 handily, but that's another story. Power is produced with the help of a twin-scroll turbocharger. All-wheel drive is available, with a driver-selectable rear axle disconnect to save a small amount of rolling friction. Cadillac estimates it'll be good for 30 MPG on the freeway, but we haven't seen official results to confirm that. A few other changes that'll affect driving: electro-hydraulic brake assist, a first for Cadillac and mainly a fuel-saving measure; and Continuous Damping Control, which alters the damper's valve continuously based on a number of parameters. It's almost certainly used here because it's lighter and less expensive than air suspension or MagneRide, and it is optional on XT4. CDC or no, all XT4s utilize a front strut and five-link rear suspension. All XT4s also ride on 18-inch wheels in various designs. The trim strategy is mildly interesting. The base model is the Luxury, and then you can choose a Sport (black exterior trim, unique wheels) or a Premium Luxury (bright trim and satin-brushed accents). The interior options are suitably upscale and premium, and we'll have more to say about them a little later when we can see this car up close.