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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

Cool car technology is cool until it breaks

Ah, technology – the beautiful date that impresses all your friends but costs you a fortune to keep happy, up-to-date, and working. Automotive News puts some numbers to the economic toll we're paying to jockey this technological Trojan horse, an analysis it sums up with "Technology is great - until you have to replace it." Back in 2000, for instance, you could replace a Cadillac Escalade taillight lens for $56.08, or replace the entire unit for $220.49. Crack the rear lens on your 2015 Escalade and you have to buy a new unit for $795 - there's no such thing as just replacing a lens anymore. What about headlights? It was $210 for an Escalade headlight in 2000, it's $1,650 for the current unit (pictured). This is nothing we didn't know, these are just hard numbers to demonstrate it. Edmunds recently provided the same with its sledgehammer-bashing of the 2015 Ford F-150, Tesla Model S buyers have been shrieking about repair costs to their electric sedan's all-aluminum bodywork, and used-car sites are full of articles about which expensive-to-repair features to steer clear of if you want to avoid big repair bills. Those expensive bits increase the price of a car - Kelley Blue Book says the average price of a car is now more than $33,000 - and that raises rates for repairs and insurance. This comes in spite of some carmakers that have been collaborating with insurance companies and repair shops at the design stage in order to engineer parts that are easier and less expensive to replace. But the tech can have its cost-saving benefits: a 2011 study by the Highway Loss Data Institute found that Volvos fitted with that company's City Safety feature "filed 27 percent fewer property-damage liability claims" than luxury SUVs without it, and just last month the Insurance Institute for Highway Safety called adaptive headlights one of the top four crash-preventing technologies on cars today (after coming out against them in 2006). So yes, the technology costs a mint when it needs to be fixed - but being able to avoid an accident in the first place might make it worth it. News Source: Automotive News - sub. req.Image Credit: Copyright 2015 AOL Cadillac Car Buying Used Car Buying Auto Repair Insurance Maintenance Safety Technology Luxury replacement parts

GM considering new powertrain options for large SUVs

Aside from the new General Motors offerings, there's not a whole lot of action going on in the fullsize SUV segment. That doesn't seem to be stopping GM from pushing the envelope in the market as Automotive News is reporting that the automaker is looking to introduce some new powertrain options into the Chevy Tahoe (and Suburban), GMC Yukon (and Yukon XL) and the Cadillac Escalade - all have been redesigned for the 2015 model year.
Now, we already know that GM and Ford are collaborating on nine- and ten-speed transmissions for a broad range of applications (including the big SUVs), but this new report says that GM is also considering other options as a way to one-up the competition and, of course, to optimize fuel economy. AN quotes Jeff Luke, executive chief engineer for GM trucks, as saying that "interesting powertrain technologies" are coming including a return of a hybrid SUV and possibly even a diesel engine. Although it sounds like the latter could come down to how customers respond to the 2014 Jeep Grand Cherokee EcoDiesel.