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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 Elmiraj sedan RWD flagship finally caught testing

While we still have no insight as to it being named Elmiraj, STS or some other permutation of the -TS nomenclature ("LTS" has apparently been registered by GM, as well), new spy shots give us proof positive that Cadillac is indeed hard at work on a rear-wheel-drive flagship model. Spied for the very first time in some north country testing, these shots provide a first look at the upcoming range-topper from Cadillac.
Impressively long and large bodywork ride atop new General Motors' corporate Omega rear-drive architecture here. Heavy cladding over camouflage may discourage finding any details, but the overall, sharp-edged and blocky design is clearly reminiscent of what we've seen on the new CTS and the recently debuted ATS coupe. A strong, wheels-at-each-corner stance helps emphasize the length of this stretched Caddy, and everything about the proportions seem spot-on for a new fullsize flagship for the brand.
It's quite possible that Cadillac will ultimately festoon this large sedan with detailing reminiscent of the original Elmiraj coupe, though thus far we've only seen prototypes wearing four-doors.

Confident new Cadillac marketing boss ready to take on Tesla, BMW

When there's a former BMW executive heading Cadillac's efforts to boost sales of its only plug-in, it's a pretty safe guess that the marketing emphasis won't be on environmental friendliness and tree-hugging tendencies. The General Motors luxury brand has appointed ex-Bimmer executive Uwe Ellinghaus to be its marketing chief late last year, and the German-born Ellinghaus is now saying that he's targeting potential customers of Tesla Motors, in addition to BMW, for potential growth in sales of the Cadillac ELR extended-range plug-in. Appointed to Cadillac's head of marketing last November, Ellinghaus recently told Advertising Age that GM needs to highlight the Cadillac's looks and performance. He complimented Tesla for putting more emphasis on those attributes in the Model S than on its lack of emissions or lack of refueling costs (but Tesla hasn't shied away from highlighting the EV's savings). Ellinghaus says that trying to gear advertising "for people who are tree-huggers and green-wash an entire brand" won't be successful. You don't say. So far, the ELR hasn't made much of a dent in US car sales. Through May, Cadillac, which spent about $280 million on all of its US marketing last year, sold 293 units, whereas Tesla had been approaching the 11,000-unit figure for the Model S. With that in mind, Cadillac may be working on a sportier version of the ELR, as spy shots of a test vehicle from May revealed larger brakes and wheels. You can read our First Drive impressions of the ELR here.