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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 ParkWhiz app helps avoid endless circling to find parking

General Motors recently launched an app for its vehicles called Marketplace that includes various apps that let you order and pay for things from your car. The company is continuing to add apps to Marketplace, and the latest sounds quite useful. It's called ParkWhiz, and it will be available on Cadillacs. Basically, it lets you find and pay for parking from your car. In more detail, ParkWhiz will let you find parking in 250 cities. The app shows locations that have spaces available and which are full, along with prices for all of them. You can then select one and pay for it for however long you'll use it. You can even reserve parking in advance in case you're going to a busy event. The big benefit here is that you should be able to eliminate a lot of cruising around looking for spaces. That will save you time and money. Additionally, this could save you from having to go really early to an event to find decent parking. It's a handy sounding app, and fortunately, if you don't have a Cadillac, you can get the app on your phone. The only downside to the phone app is that it's not built into the car's infotainment system.

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.