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Why an independent rear suspension for GM's new, full-sized SUVs wasn't easy

A Motor Trend report last month laid out how Cadillac's 4.2-lier twin-turbo Blackwing V8 could be an orphan due to cost concerns in the GM empire. Last-minute chassis changes to Cadillac's new sedans and XT6 crossover led to engine bays that couldn't fit the Blackwing. On the SUV side, according to the report, the new independent rear suspension for big people haulers cost so much to implement that GM ruled out reworking the Escalade to accept the Blackwing. At least one commenter rightly asked how could a suspension swallow that much money. A new piece in Motor Trend has the answer. The excellent Alissa Priddle spoke to Tim Herrick, GM's executive chief engineer for full-size trucks, about why the clean-sheet IRS cost "multimillions of dollars."  First, GM would need to build a new body shop at the Arlington, Texas plant that assembles the automaker's big SUVs to stamp the numerous wholly new parts and panels accommodating an IRS. Then GM would need to design and pay for a new assembly process. On top of those up-front costs, there was the incremental cost of the four-link IRS components being more expensive than those in the trucks' former leaf-sprung solid axles. Herrick endured so many rejections for so long that he remembers the date and time when he got approval for the new unit. He said it came down to a meeting where he told a higher-up, "I'll make you a deal: If we get to the reveal, or if we launch this and you think this was a dumb idea, I'll hand you my badge and let you walk me out." Head to Motor Trend to read the full story. Based on Herrick being on stage to help present the new SUVs to the press, and on our First Ride in the new Chevrolet Tahoe and Suburban at GM's Milford Proving Grounds, it appears this will have a happy ending for all involved. Furthermore, since Herrick worked on the T1 platform that supports the big SUVs as well as the light- and heavy-duty pickups, he understood the demands on the commercial side, too. That could be why when Roadshow asked Tim Asoklis, chief engineer of the Tahoe and Suburban, if the new IRS could endure life in the Chevrolet Silverado and GMC Sierra, Asoklis answered, "Oh, absolutely." Related Video:    

2021 Cadillac Escalade Interior Review | Tech-forward fortress

Of all the interiors that are vital to Cadillac’s success, the new 2021 EscaladeÂ’s is arguably the most important. ItÂ’s supposed to be the best GM can muster, and the previous generation was a distant second to the classically elegant Lincoln Navigator. Cadillac didnÂ’t try to copy LincolnÂ’s success with its redesigned full-sizer, instead opting to follow a more generic theme of tech-forward luxury. When we say tech-forward, though, we mean it. The 38 inches of curved OLED screens we covered in our Escalade infotainment review absolutely dominate the dash in a brazen display of opulence. There isnÂ’t much room for anything else to take center stage, but whatÂ’s there is extremely nice. Large swaths of wood trim stretch across the dash and also adorn a substantial part of the center console. ItÂ’s harder to find something that doesnÂ’t feel like soft-touch leather, wood or metal trim than it is to find cost-cutting materials. There are certainly some areas with the usual black plastic for buttons, but every car company that isnÂ’t Rolls-Royce resorts to plastic at some level. The seating position and ergonomics of the Escalade are a big step up from past models. There was a feeling of claustrophobia in previous Escalades with the whole interior being built up around the driver in an unfriendly manner. This Escalade tones that down with lower and flatter surfaces, along with just being bigger in general. That feeling of expansiveness is great for decompressing and relaxing in the available heated, cooled and massaging seats. Riding in the back is almost as lovely. Switching to an independent rear suspension and making the vehicle longer means more passenger and cargo space (10.3 cu-ft more than before with the third row up). The majority of this is realized in the third row (10.4 inches more than before), where even large adults can sit comfortably with a laid-back seating position. Before, if your knees weren't in your face, it's probably because you gave up and hitched a ride with someone else. A BMW X7 or Mercedes-Benz GLS will still outclass it for materials and third-row features, but the Escalade wins on sheer bigness. Getting back there is a breeze with a huge walkway, though putting the seat back into place is borderline annoying, requiring much more physical effort than a powered second row would. As big as the third row is, sitting in the second row is even better thanks to the massive dual screens mounted to the front headrests.

NHTSA, IIHS, and 20 automakers to make auto braking standard by 2022

The National Highway Traffic Safety Administration, the Insurance Institute for Highway Safety and virtually every automaker in the US domestic market have announced a pact to make automatic emergency braking standard by 2022. Here's the full rundown of companies involved: BMW, Fiat Chrysler Automobiles, Ford, General Motors, Honda, Hyundai, Jaguar Land Rover, Kia, Mazda, Mercedes-Benz, Mitsubishi, Nissan, Subaru, Tesla, Toyota, Volkswagen, and Volvo (not to mention the brands that fall under each automaker's respective umbrella). Like we reported yesterday, AEB will be as ubiquitous in the future as traction and stability control are today. But the thing to note here is that this is not a governmental mandate. It's truly an agreement between automakers and the government, a fact that NHTSA claims will lead to widespread adoption three years sooner than a formal rule. That fact in itself should prevent up to 28,000 crashes and 12,000 injuries. The agreement will come into effect in two waves. For the majority of vehicles on the road – those with gross vehicle weights below 8,500 pounds – AEB will need to be standard equipment by September 1, 2022. Vehicles between 8,501 and 10,000 pounds will have an extra three years to offer AEB. "It's an exciting time for vehicle safety. By proactively making emergency braking systems standard equipment on their vehicles, these 20 automakers will help prevent thousands of crashes and save lives," said Secretary of Transportation Anthony Foxx said in an official statement. "It's a win for safety and a win for consumers." Read on for the official press release from NHTSA. Related Video: U.S. DOT and IIHS announce historic commitment of 20 automakers to make automatic emergency braking standard on new vehicles McLEAN, Va. – The U.S. Department of Transportation's National Highway Traffic Safety Administration and the Insurance Institute for Highway Safety announced today a historic commitment by 20 automakers representing more than 99 percent of the U.S. auto market to make automatic emergency braking a standard feature on virtually all new cars no later than NHTSA's 2022 reporting year, which begins Sept 1, 2022. Automakers making the commitment are Audi, BMW, FCA US LLC, Ford, General Motors, Honda, Hyundai, Jaguar Land Rover, Kia, Maserati, Mazda, Mercedes-Benz, Mitsubishi Motors, Nissan, Porsche, Subaru, Tesla Motors Inc., Toyota, Volkswagen and Volvo Car USA.