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GM removes start/stop from full-size trucks and SUVs with V8 engines

GM is removing start/stop technology from a number of its popular full-size SUVs due to the ongoing chip shortage. This follows the removal of cylinder deactivation technology from some of its trucks, which was also due to the chip shortage. GM Authority first reported the news, but we’ve just confirmed everything with a GM spokesperson.  The following 2021 model year vehicles will be affected: Chevy Tahoe, Chevy Suburban, GMC Yukon, Cadillac Escalade, Chevrolet Silverado 1500 and GMC Sierra 1500. Only versions of those vehicles built with the 5.3-liter V8 or 6.2-liter V8 and mated to the 10-speed automatic will have the tech removed from them. Only vehicles manufactured on or after June 7 will be affected. “By taking this measure, it will enable us to continue production of our high-demand full-size SUV and pickups as the industry continues to rebound and strengthen,” GM said in a statement. Those who ultimately buy one of these vehicles without start/stop technology will receive a $50 discount off MSRP for their troubles. Losing this fuel-saving tech could be a big negative for some, but we know many folks turn it off anyway. Not having to press the button to deactivate start/stop every time could actually be a positive if youÂ’re part of the camp who does that already. 2021 Cadillac Escalade Sport Platinum View 27 Photos On the downside, GM says “most of the affected vehicles will experience a minor reduction in fuel economy.” We donÂ’t have revised window stickers in hand to know how each model will be affected, but any 1 mpg reduction will be rather impactful for vehicles rated as low as these trucks already are. Any reduction will be seen in the city mpg rating, so take the kind of driving youÂ’re going to be doing into account before purchasing. When it comes to greenhouse gas compliance rules, GM says it doesnÂ’t foresee this impacting the companyÂ’s average fleet score. It also intends to begin adding start/stop back to these models as soon as possible, but there will be no retrofit effort made to fit the tech to vehicles already built without it. “Our supply chain organization continues to make strides working with our supply base to mitigate the near-term impacts of the semiconductor situation,” GMÂ’s statement reads. “GM continues to leverage every available semiconductor to build and ship our most popular and in-demand products, including our highly profitable full-size trucks and SUVs for our customers.

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 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.