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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:    

2014 Cadillac XTS gets 410-hp twin-turbo V6

General Motors told us so back in March, but it is now official: The twin-turbocharged 3.6-liter V6 announced for the 2014 Cadillac CTS will also join the options list for the 2014 Cadillac XTS. The LF3 engine puts out 410 horsepower and 369 pound-feet of torque in the XTS, however, which is 10 hp and 61 lb-ft down from its application in the CTS. It will be identifiable from the outside by a specific grille treatment and a badge on the decklid. The 3.6-liter V6 with 304 hp and 264 lb-ft holds steady as the standard engine, and both will be yoked to a six-speed automatic transmission with paddle shifters.
Also new for the front-wheel drive model for 2014 are updates that include electric power steering and optional Automatic Parking Assist that can maneuver the sedan into parallel parking spots. The three trims above standard - Luxury, Premium and Platinum - get Intellibeam headlights that automatically switch between high- and low-beam,
The four current trim levels remain but the list of optional extras for the higher specs grows with a rear-seat entertainment system equipped with DVD screens in the front seatbacks, memory settings for the front passenger seat and an armrest in the back seat fitted with radio and sunshade controls. The press release below has more info on all of the changes.

These are the fastest-selling new cars of 2024

Automakers finally appear to be back on their feet after a few years of severe instability, but that hasn’t helped all of them in the sales department. iSeeCars recently released its study on the fastest- and slowest-selling new vehicles and found that some companies are moving vehicles off dealersÂ’ lots at more than twice the pace of others. Toyota was the fastest-selling new car brand between October 2023 and March 2024, moving vehicles in an average of 39.6 days. Surprisingly, Alfa Romeo came second, averaging 41.8 days on the market. Last year, we saw a list of the fastest-selling individual nameplates overall, as opposed to this study that's ranked by brand. Fastest-selling new cars of 2024 Toyota: 39.6 days on the market Alfa Romeo: 41.8 Cadillac: 43.4 Honda: 44.2 Jaguar: 44.4 Kia: 47 Hyundai: 47.1 Subaru: 49 BMW: 49.1 Mazda: 53.1 The brands moving inventory the fastest show a strong value and desirability for buyers. iSeeCars executive analyst Karl Brauer noted, “Fast-selling brands like Toyota and Honda represent mainstream consumers seeking maximum value for their new-car dollar. Conversely, high-ranking luxury, low-volume brands like Alfa Romeo, Cadillac, and Jaguar reflect both their limited supply as well as high demand from affluent buyers willing to snap these models up shortly after they arrive on dealer lots.” Of course, there is no light without darkness, and on the other side of the list are a handful of brands struggling to move inventory. Lincoln was the slowest-selling new car company, with an average of 82.6 days to sell. Infiniti was close behind at 79.8 days, and Buick took an average of 79 days to move units. iSeeCars noted that new EVs take much longer to sell than their hybrid counterparts, at an average of 70.6 days on the market in March 2024, compared to just 49.5 for hybrids. Some of the fast-selling new brands also made the used car list. Used Hondas sold the fastest, only sitting on dealersÂ’ lots for an average of 26.1 days. LexusÂ’ used cars sat for 26.3 days, and Toyota moved its used inventory in an average of 27.4 days. By the Numbers Green Alfa Romeo Cadillac Toyota Car Buying