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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

J.D. Power customer survey of dealers counts Cadillac, Buick as big winners

Cadillac and Buick have taken the trophies in J.D. Power's latest Customer Service Index Study examining satisfaction with dealer service. Surveying more than 90,000 owners and lessees of 2009-2013 model-year cars, the study found that those with pre-paid maintenance packages were ten percent more likely to buy their next car from the same brand.
Dealer satisfaction scores have improved overall, Cadillac nabbed the luxury segment ahead of Audi and Lexus, taking the crown that Lexus held last year. Buick keeps the mass-market dealer satisfaction win in the family, finishing ahead of Volkswagen and last year's winner GMC. The study also found that service department use of tablets increased customer satisfaction, as did "best practices" like "providing helpful advice." Who knew?
You can find details on those and more findings in the press release below.

Why Cadillac needs a real truck in its lineup

Premium brands such as BMW, Mercedes-Benz, Lexus, and Cadillac sell vehicles that cover the spectrum from car to crossover to SUV. But trucks? They remain the last frontier when it comes to luxury brands. These days Chevy, GMC, Ford, and Ram sell cheap, bare-bones work trucks alongside loaded models that top $75,000. There is a reverse elitism that comes with this sales tactic. A brand gets to reflect a rugged working class lifestyle with the emblem up front, while what's behind it costs as much as a small house in middle America. But Americans who spend big money on cars and SUVs have always gradually tailed towards luxury nameplates over time. Everyone knows what an Escalade is, and thanks in large part to that image the Escalade is now the best-selling fullsize luxury SUV in the USA. Cadillac's flagship model, along with its midsize luxury crossover, the SRX, routinely outsell the competition from Audi, Mercedes, and BMW, not to mention Ford's Lincoln brand and most of the Japanese rivals. With trucks already dominating overall sales and headed into the pricing stratosphere, I believe it's time for Cadillac to consider a fullsize truck. And no, not a lipstick version that merely takes a Chevrolet Silverado pickup and throws in a few leather seats and some slight interior touches. That experiment already failed both for Cadillac (the Escalade EXT) and for Ford's Lincoln brand (Blackwood, Mark LT). Cadillac is an American brand that currently focuses a ridiculous amount of energy and resources trying to compete with European car offerings. The brand needs to create the Cadillac of trucks. Head honcho Johan de Nysschen has been blunt in his desire to "restore Cadillac to the pinnacle of global premium brands, not in sales but in aspirational brand character." This sounds well and wonderful. But the present problem in achieving this goal is that, on a global basis, Cadillac is a failed brand. Look at Europe, where Cadillac has sold so poorly in recent years that former Soviet manufacturer Lada managed more new registrations in 2014 by a factor of more than four to one. Cadillac is an American brand that currently focuses a ridiculous amount of energy and resources trying to compete with European car offerings. After more than 20 years of Cadillac models selling themselves as import killers, the only one with sustained success has been the CTS, and even that has been a marketplace loser for the last several years. The CTS-V?