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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:    

2022 Cadillac CT5-V Blackwing, CT4-V Blackwing bring big performance back to the brand

They're finally here, the real successors to the Cadillac CTS-V and ATS-V: the 2022 Cadillac CT5-V Blackwing and CT4-V Blackwing. And at least on paper, they sure seem like worthy successors to those superb super sedans. They're more powerful, come with standard manual transmissions, and feature the latest and greatest chassis upgrades available. We'll start things off with the most beastly of the Caddies, the CT5-V Blackwing. Like the CTS-V predecessor, the Blackwing gets a supercharged 6.2-liter pushrod V8. But thanks to intake and exhaust improvements, output is up to 668 horsepower and 659 pound-feet of torque, as opposed to the CTS-V's 640 horses and 630 pound-feet. The engine also is handbuilt in Bowling Green, Ky., just like the short-lived turbocharged DOHC Blackwing V8. It's coupled either to a six-speed manual transmission with a twin-disc clutch, rev matching and no-lift shifting, or a 10-speed 10L90 automatic transmission. Power goes to the electronically controlled limited-slip differential at the rear, and rear-wheel drive is the only drive configuration available. The transmission and differential each get their own oil coolers, too. Cadillac says the CT5-V Blackwing should be able to hit 60 mph in 3.7 seconds with the automatic transmission, and the top speed is over 200 mph. 2022 Cadillac CT5-V Blackwing View 13 Photos As for the CT4-V Blackwing, it gets a twin-turbocharged 3.6-liter V6 built in Canada, and although it is more powerful than the previous car, it's only by a small amount. The CT4-V Blackwing makes 472 horsepower versus the ATS-V's 464, and the 445 pound-feet of torque is the same between each car. Just like the CT5-V Blackwing, the CT4-V gets either the same six-speed manual transmission or a 10-speed 10L80 automatic transmission, the electronically-controlled limited-slip differential, and the oil coolers. Picking the manual transmission has extra perks on the CT4-V Blackwing, though. The engines in manual cars received titanium connecting rods and revised crankshaft counterweights. The manual transmission's no-lift shift functionality is also more helpful on the CT4-V Blackwing since it keeps the car in boost between gears. Still, Cadillac's 0-60 mph time estimate is for the automatic model at 3.8 seconds. Top speed is 189 mph. 2022 Cadillac CT4-V Blackwing View 16 Photos Keeping all that power under control are a variety of chassis upgrades.

Cadillac to ditch China-only LWB models for global 'right size'

We often think of Buick being General Motors' poster child in China, but would it surprise you to hear that Cadillac is just doing a bang-up job in the People's Republic? It's true, the Standard of the World is on fire, and it's doing so with a surprising group of buyers that are going to push through globe-spanning changes for the brand. Cadillac's average buyer age in the People's Republic of China is just 34. Yes, younger buyers dominate the Chinese market, but according to Reuters, Cadillac's young buyers want to drive and they don't want the typical businessman's German-badged sedan. Cadillac understands this, and is setting about to exploit it with a shift in its Chinese strategy. According to President Johan de Nysschen, the company will begin moving away from the China-only, long-wheelbase models, like the ATS-L. Instead, it will push for a global "right size" design, along with some stylistic changes. "You will see a softening of some of the hard edges, and more three-dimension styling on the side of the car," de Nysschen told Reuters, while noting that the cars will still be "instantly recognizable as Cadillac." Even without these changes, though, Cadillac has bucked the trend in China. At 17 percent, the company's sales exceeded the PRC's overall market growth of 7.3 percent by a significant margin. In fact, Cadillac's 2015 gains outpaced the overall market growth in China over the past three years, as the brand jumped to nearly 80,000 units. And the company is hoping to push that even higher, Reuters reports, with President Johan de Nysschen targeting a 25-percent increase in 2016. Related Video: