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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

Junkyard Gem: 1993 Cadillac Allante

The General's Cadillac Division had lost much of its status as a world-class styling and engineering innovator by the 1980s, while younger rich Americans signed on the line which is dotted for European luxury machines packed full of futuristic technology. Something needed to be done to win back the hearts of those buyers, and that something was the Cadillac Allante two-seater. Here's a final-model-year Allante, complete with one of the very first Northstar V8 engines, found in a Denver yard. The overhead-valve Cadillac V8 engine of 1949 shook up the automotive world, and the double-overhead-cam Northstar V8 of 44 years later had a similar effect. Finally, a high-revving, smooth-running modern V8 to compete with those pesky European and Japanese carmakers! Only the Allante got the Northstar at first, with other Cadillac models following soon after. After the underwhelming power output of the pushrod HT4100 V8s used in the 1987-1992 Allantes, the upgrade from 200 horses to 290 helped boost sales of the '93 to the highest annual figure ever achieved by the model: 4,670 cars. Unfortunately for GM, production costs of the Allante proved to be murderous in the long run. Shortened Eldorado frames were loaded onto specially-fitted 747s in Detroit and flown to Pininfarina's new Allante factory in Italy. After Pininfarina built the bodies, they got loaded onto the 747s, flown back to Detroit, trucked to the Hamtramck assembly plant, and given running gear there. GM called this system the "Allante Air Bridge" and it cost plenty. The cars looked both futuristic and Italian, which they were, but the Allante's price tag stood at heights far above those of the rest of the Cadillac line: $59,975 in 1993, or about $108,500 in 2020 dollars. You could buy a rear-wheel-drive BMW 850Ci with a 282-horse V8 and manual transmission for a mere 10 grand over the Allante's cost that year, or a Jaguar XJS convertible for just $56,750. The Allante had front-wheel-drive and a not-so-modern four-speed automatic transmission, which hurt sales among the enthusiast types who flocked to Cadillac showrooms for the CTS-V a decade or so later. No European machine of 1993 could top the Mars Base appearance of these vertically-arranged, all-pushbutton HVAC/audio controls, though.

Cadillac explains origins of Lyriq EV name

We feel for Cadillac, a brand we're inclined to dub the Alex Rodriguez of the automotive world — so much obvious talent, its gifts warped by repeated questionable moves and an inability to conclusively close the deal on The Big Stage. And as with Rodriguez, the expectations are so high at the same time the disappointment is so entrenched that Cadillac gets no benefits of any doubts, the commentariat ruthless with criticism for anything less than an out-of-the-park home run. This latest news, like the Newton-meter torque-based naming scheme initiated earlier this year, likely won't help. GM Authority asked Cadillac about the origin of the Lyriq name for the coming battery-electric crossover. Global head of brand strategy Phil Dauchy explained three threads that went into the new moniker. In no particular order, one thread is that "Cadillac," according to Dauchy, gets more mentions in song lyrics than any other brand, including non-automotive brands. The Music Lyrics Database, while not exhaustive, supports the case: Cadillac has 31 pages of lyric mentions among bands from Rancid to Weird Al Yankovic, beating every other brand we could think of. So ... lyrics into Lyriq. The second thread is rolled up with Cadillac's move to proper names instead of alphanumerics for the sedan and crossover lines, all of those names to end in "iq," as well as the push into electric vehicles. Dauchy told GMA the nomenclature overhaul and the two-letter suffix "[signal] that Cadillac is bringing a different type of vehicle to market, one that works in concert with man, nature, and machine." He's bullish on swaying the public with the product, adding, "When you see [the Cadillac Celestiq], its size, presence and scale all connote the emotion associated with the name." The final thread that went into the Lyriq name the alliteration of brand and model names. As GMA phrased it, perhaps unsettlingly, "With Cadillac and the model name both ending in an 'ick' sound, these names roll off the tongue quite well." This brings up a question raised in a number of comments about the Lyriq, which asks whether the last syllable is pronounced "ick" or "eek." Until now, I've pronounced the coming crossover with an "eek" at the end. "Lyr-eek" strikes me as more luxurious, and "Celest-eek" sounds better to me than "Celest-ick," that latter model being the flagship EV that follows the Lyriq. Of course, it also makes me wonder if I've been pronouncing "Cadillac" correctly.