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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

GM recalling 524k vehicles over hood latches and toe link nuts

Just hours after confirming to Autoblog its intention to recall 97,540 vehicles in the US (117,651 in North America) for a possible manufacturing defect in the chassis control module of several models, General Motors is issuing two more campaigns that affect another 379,401 units in the US (524,384 in North America).
One campaign covers 290,107 US examples of the 2010-2015 Cadillac SRX and the 2011-2012 Saab 9-4X because the "rear toe link adjuster lock nuts" may be improperly torqued. If not up to spec, the toe adjuster link could separate and allow the wheel to shift while driving, making the handling unstable. GM says that it knows of three crashes and two injuries as a result of this problem. Dealers are inspecting the nuts and installing a new link assembly, if necessary. Autoblog first reported about this potential issue when it showed up on a list of recalls from Transport Canada.
The second recall is for 89,294 examples of the 2013-2015 Chevrolet Spark in the US manufactured from January 17, 2012, through July 29, 2014. According to GM, "corrosion can cause the secondary hood latch striker to stick in the open position." If this happens, and the primary latch also isn't engaged for some reason, the hood could fly open while driving. About 13,000 of these affected Sparks are at dealers and are being held until repaired. The fix requires replacing the hood striker. GM isn't aware of crashes, injuries or fatalities caused by this problem.

2021 Cadillac Escalade vs. 2020 Lincoln Navigator | How they compare on paper

The 2021 Cadillac Escalade arrived late last night, and we all know what that means: It’s comparison time. Specifically, weÂ’re pitting the new Escalade versus the 2020 Lincoln Navigator. The sales gap between the long-time competitors has grown dangerously close for Cadillac ever since the revolutionary new Navigator came out for the 2018 model year. In 2019, the Navigator was only about 4,000 units down from the Escalade. Cadillac intends to widen that gap back up with a new truck, and now itÂ’s time to see if itÂ’s brought the right goods to the party. With the redesigned model that now features an independent rear suspension, these two are more alike than theyÂ’ve been in a long time. The Escalade was stuck with the less space-efficient solid rear end up until now, as GM hadnÂ’t yet made the switch to IRS that Ford long-ago did. Now that it has, these two are super similar from a dimensions perspective. Cadillac was playing catch-up in this fight, so it knew exactly where it needed to aim to come out victorious in a specs battle such as this one. A quick note on the chart below. Both of these models have a “regular” and “long” version. The EscaladeÂ’s long variant is still named ESV, and the NavigatorÂ’s long version is simply named L. In the dimensions section, we distinguish between the two with a “/” — the “regular” length version is on the left, and the “long” version is on the right side of the slash. The numbers are below: Powertrain The Lincoln Navigator still reigns supreme when it comes to power, as the 3.5-liter twin-turbo V6 is high on both horsepower and torque. GMÂ’s small-block V8 comes close, but ultimately falls short by 30 horsepower and 50 pound-feet of torque to the twin-turbo V6. Cadillac does have an ace up its sleeve, though. It comes in the form of the 3.0-liter turbo-diesel inline-six engine. Lincoln hasnÂ’t dropped the PowerStroke diesel into the Navigator (and we'd be shocked if it does), so Cadillac has a unique offering in this segment now. The diesel will be optional on the Escalade, but it has less horsepower and the same amount of torque as the V8. We expect the big advantage for the diesel will come in fuel economy, an area where the Silverado Duramax diesel currently outpaces the full-size truck competition. Both of these big SUVs come standard with 10-speed automatic transmissions. Intriguingly, itÂ’s the 10-speed automatic that was co-developed between Ford and GM.