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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 ELR production has stopped, Chevy Bolt coming in Oct.

It looks like General Motors' Cadillac ELR extended-range plug-in is out as the automaker prepares to go all in on the Chevrolet Bolt electric vehicle. The Caddy officially stopped production in February, Hybrid Cars says, citing Cadillac Product Communications Manager David Caldwell. There is still a "small quantity" of the coupe at dealerships, but this take on mashing up "luxury coupe" with "green vehicle" has about run its course. Caldwell and Johan de Nysschen, president of General Motors' Cadillac division, had already confirmed earlier this year that the ELR, which was first available as a 2014 model, wouldn't have any further generations, though weren't specific on when production would stop. The ELR uses an upgraded version of the first-generation Volt's powertrain to move the 4,000-pound beast, and while the Volt is now in its second generation (and this year's sales have more than doubled from a year earlier as a result), the ELR never received a similar upgrade. The ELR sold just 357 units through April. As a result, the ELR sold just 357 units through April, down almost nine percent from a year earlier. In all of last year, 1,024 ELRs were sold, compared to more than 15,000 units for the Chevy Volt, and that's after the ELR's price was cut by about $9,000 last April. The car also got about a 25-percent increase in power, but that didn't seem to do the trick when it came to boosting demand, even with the available $7,500 federal tax credit. Meanwhile, Hybrid Cars is reporting that the 2017 Bolt, which will feature a single-charge range of about 200 miles and is expected to retail for about $35,000, is likely to start production at GM's Orion Assembly Plant in October. While you wait, if you're already feeling nostalgic, check out our impressions of the ELR here. Related Video: Featured Gallery 2014 Cadillac ELR Review View 48 Photos News Source: Hybrid Cars Green Plants/Manufacturing Cadillac Coupe Hybrid Chevy Bolt cadillac elr elr extended-range plug-in bolt

2015 Cadillac ATS Coupe priced from $37,995*

Cadillac has released pricing details on its new-for-2014 ATS Coupe. The new model, which will be available with buyer's choice of a 2.0-liter, turbocharged four-cylinder or a 3.6-liter V6 (the ATS Sedan's base 2.5 won't be making the trip) can be had with optional all-wheel-drive in place of the standard rear-wheel setup, while customers can also snag a six-speed manual or six-speed auto.
Prices start at $37,995, which represents a $2,900 premium over the 2014 ATS Sedan (pricing on the 2015 four-door isn't available yet) with the same 2.0-liter engine. Still, the ATS Coupe starts at just over $2,500 less than a base BMW 428i, which is also less powerful and offers less standard equipment. The Caddy is also less costly than the Mercedes-Benz C250 Coupe, although only by about $200. It's even cheaper than the Audi A5, which starts at $38,105, but that model includes all-wheel drive as standard. It should be noted that these prices are without their respective destination charges (*$995 for the Caddy, $925 each for the BMW and the Mercedes and $895 for the Audi).
Unfortunately, Cadillac hasn't released any additional pricing information beyond what we have here, so we can't tell you how much things like all-wheel drive, an automatic transmission or the 321-horsepower V6 will cost. That makes it difficult to figure out just how reasonable the ATS Coupe will be relative to its challengers, but so far, the value equation looks to be in the car's favor. When those full details roll in, though, you know where to look. Scroll down for the official press release from Cadillac.