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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 launching crossover-heavy product offensive

Utilizing information provided by Cadillac suppliers, Reuters says that Cadillac is preparing two more crossovers that will bow after its current product initiative is complete. According to the report, a year after the next SRX arrives in 2016, a pair of CUVs will be unveiled that will bracket it in size, and they'll be headed for the US and Chinese markets.
That is years away, though. For now, the company's attentions are on the nearly here CTS and ELR range-extended coupe, the next Escalade SUV (shown above), an ATS coupe, and the range-topper that will sit above the XTS. That, and possibly an even more impressive range-topper that promises to be the mean and majestic super-luxe unicorn Cadillac we've been dreaming about for more than a decade now.
In response to the issue of how German crossovers might be having an impact on Cadillac's future plans, a company source said - rightly, we think - "we don't need to duplicate the Germans." That doesn't mean, however, that it can't wade deeper into a market segment that the Germans are making a ton of money in. In fact, and since everyone is doing it, we'd be surprised if Cadillac didn't, even if it won't happen for another four years.

Is this the 2014-15 Cadillac Escalade?

Following the introduction of the redesigned Chevrolet Silverado and GMC Sierra, we're expecting General Motors won't wait too much longer to show off the next-generation fullsize SUVs that share this platform - including the Cadillac Escalade. It's still not clear if the next Escalade will debut for the 2014 or 2015 model years, but Carscoops has what it claims to an exclusive first look of the new Cadillac, revealing a portion of the headlight, front fascia and wheel.
Judging from this small picture, it looks like the Escalade could incorporate styling cues that we've seen on new Cadillac models like the ELR and the 2014 CTS, but that article says that other design details could include tall, vertical taillights similar to the CTS Wagon, staggered-width wheels and a narrower daylight opening for the side windows. The last time we saw the fourth-generation 'Slade back in October in spy shots, the heavy camouflage prevented us from getting an idea of the luxury SUV's appearance, but this image and description gives us something to look forward to. Head on over to Carscoops for more potential information as well as a full rendering from back in January.