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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

Meet the other Cadillac wagon. It's as American as ABBA

The Cadillac CTS Wagon became a cult classic the second it went on sale. We all knew that it was never going to sell in anything approaching significant numbers, and if that "we" didn't include those actually working at GM, one would have to wonder what they were smoking. Cadillac was still having a hard enough time trying to convince people that it was now a BMW-fighting sport luxury brand rather than the purveyor of Grandpa-piloted land yachts. To many, a sport sedan like the CTS seemed like a stretch. But a CTS sport wagon? It sure seemed like GM was just doing things for funzies, an impression only enhanced by the CTS-V Wagon. Forget cult classic. That thing was an instant legend.  And yet, the CTS wasn't the only Cadillac of that era offered as a wagon. It wasn't even the first. Before GM said "to hell with it, let's have some fun" on this side of the pond, over in Europe, it had already taken a page from its old badge-engineering playbook to create the 2006 Cadillac BLS Wagon. It was available as a sedan, too, but its awkward majesty is best enjoyed as the long-roof model.  There's just something off about the whole thing, right? That's probably because it also looks vaguely familiar, as if you've seen it before. So where the hell does this thing come from? Sweden! Behind that Cadillac Art and Science face is a Saab 9-3, and in the case of the BLS Wagon, the Saab 9-3 Sport Combi wagon. The roofline is the dead giveaway, as no other wagon has ever looked like that. In fact, the roof and windows were the only exterior elements to copy directly over from 9-3 to BLS. No kidding. With the Cadillac front end, doesn't the Saab-funky-boxiness make it look like a miniature hearse? The answer is yes. GM's design team, led by Ed Welburn, was quite pleased with his work. Perhaps it even egged him on to create a real Cadillac sport wagon? "The whole team was very excited to apply Cadillac's design language to a wagon for the first time," said Welburn in a press release from the time. "The V-shaped chrome-plated grille, a Cadillac hallmark, is picked up again by the shape of the rear window, and the body side character lines make it unmistakably a Cadillac." The interior is surprisingly different from the 9-3, including the ignition switch migrating from the center console up to the steering column. It also wasn't exactly in keeping with the Cadillac norm of the time.

10 best new car deals of November 2021

Sales of new cars, trucks and SUVs were drastically affected in 2020 due to the (still) ongoing coronavirus pandemic. The market started to show signs of recovery toward the end of last year before really coming on strong in the early months of 2021. Of course, then pandemic-related parts and worker shortages along with global shipping constraints started running amok and causing a great deal of pricing fluctuation and a limited supply of certain vehicles. Those problems (among other things) have led to record-high new-car transaction prices in the United States. The good news is that there are still plenty of great deals on new cars. Using data provided by TrueCar, we’ve compiled a list of some of the best automotive deals for November 2021. WeÂ’ve noted the original MSRP, the average transaction price, and the total savings in both dollars and as a percentage of the original sticker price. Basically, weÂ’ve done all the hard work for you! So now, all you need to do is compare deals, go on a few test drives, and maybe drive away in a great car (and an even better bargain).