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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

Next-generation Chevrolet Colorado breaks cover in new spy photos

The next-generation Chevrolet Colorado broke cover in this fresh set of spy photos this week, giving us a glimpse of what to expect when GM's compact trucks are replaced in what is expected to be either 2023 or 2024.  Thanks to its still-extensive camouflage, this prototype doesn't give away a ton about the new Colorado's styling, but in profile, it appears as though the swoopy, upswept rear cab line might become a thing of the past. We wouldn't be surprised to see the new Colorado adopt a more angular, squared-off look more akin to that of its big brother, the half-ton Silverado. The Silverado is also expected to donate what may be the new Colorado's only powertrain. Taking a cue from Ford, Chevy is expected to offer the next-gen Colorado with just a turbocharged four-cylinder engine — the new corporate 2.7T in this instance. The large, 310-horsepower four-pot can easily take over for the 3.6L V6 currently available in the GM twins and one-up the 270-hp Ranger to boot. This would mark the end of both a V6 and diesel option being offered in GM's midsize trucks, and tracks with the company's slow, silent effort to eliminate lower-margin models. We say "trucks" because, well, whatever happens with Chevy is likely to translate to GMC. The Canyon will be due for replacement at the same time, and will likely carry on as a re-skin of Chevy's offering. We're not yet certain exactly when Chevrolet will start selling the next-gen Colorado, but given the reasonably complete state of this prototype, we expect it won't be long now. Rumors suggest it could hit the market in 2023 as a 2024 model.  Related Video: The Best Midsize Pickup: Ranger vs Gladiator vs Tacoma vs Colorado

Nissan Leaf makes it 19 in a row for record sales; Chevy Volt drops 21 percent

The Nissan Leaf continues its streak of "best month ever" sales with 2,881 EVs sold in September. Compared to the 1,953 sold in September 2013, that represents an increase of 47.5 percent and, as Nissan itself must be tired of saying by now, it marks yet another best month ever, same as last month and now the 19th in a row. Okay, sure, we know, Nissan will tout this run for as long as it can, but we're certainly expecting it each month, so if it ever doesn't happen, it'll be interesting to see how Nissan talks about it. Year-to-date, Leaf sales are up 35.7 percent compared to 2013. In any case, Nissan's director of EV marketing, Toby Perry, sent AutoblogGreen a statement that said, "Nissan Leaf owners have turned into some of our best marketers, and they jump at any opportunity to share their enthusiasm with friends and family. Take National Drive Electric Week – a grassroots celebration of all things EV and the perfect platform for LEAF owners to showcase the benefits of going electric. After celebrating with EV owners in more than 130 cities across the country, we saw a significant increase in Leaf showroom visits with midweek traffic just as heavy as what we see on the weekends." Year-to-date, Leaf sales are up 35.7 percent compared to 2013. Over on the Chevy Volt front, things aren't quite as rosy. After coming off a good August (the best sales month of 2014 by almost 500 units), Volt sales were down to 1,394, a decrease of 21.1 percent compared to September 2013. So far this year, Volt sales are down 13.2 percent year-over-year. It's kind of a stretch, but perhaps people are already waiting for the next-gen Volt, which will be revealed at the Detroit Auto Show in January, to go on sale? Speaking of things we say every month, our in-depth round-up of US green car sales is in process and will be appearing soon. Until then, please discuss how these two long-standing plug-in champs are doing on the sales floor. Green Chevrolet Nissan Electric Hybrid PHEV ev sales hybrid sales