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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:    

2015 Cadillac Escalade is exactly what you expect [w/video]

Leading up to the debut of the 2015 Cadillac Escalade, we were told that the new luxo-SUV would be "much less ostentatious" and that we could expect greater differentiation from its Chevy Tahoe/Suburban and GMC Yukon siblings. And while those things may be true to some extent, after digesting the full raft of Escalade information and photography, we can say that this new 2015 model is exactly what we were expecting all along.
No, there isn't a single part of the new Escalade package makes us go "wow" or "ooh," but it still looks like a solid, nicely updated offering that will surely attract the same sort of baller status when it hits the road. For starters, the new front end has been completely redesigned, where cleaner, tauter lines work with the full-LED headlamps and running lamps to create a face that, while familiar, falls right in line with the rest of Cadillac's lineup. Around the sides, the shape is exactly the same as the rest of the SUV's platform mates, with better-fitting body panels and a handsome, upright design. Of course, 20-inch wheels are standard, and hifalutin' 22-inch rollers are available (in chrome, we assume). Things get really interesting around back, where full-LED taillamps extend from the bumper all the way up to the top of the tailgate, and - like the Tahoe/Suburban/Yukon - the rear window wiper has been integrated into the top of the hatch for a cleaner look. It all looks pretty modern and good, but doesn't really tone down the otherwise flashiness of the Escalade package.
Like its predecessor, the new Escalade will be available in standard- and extended-wheelbase formats (bring on the EXT!). Only one engine is available: GM's 6.2-liter EcoTec3 V8, good for 420 horsepower and 460 pound-feet of torque, mated to a six-speed automatic transmission. Both two- and four-wheel drive configurations will be offered, and the new Escalade should be a bit better to drive than the previous model, with a new coil-over front suspension and five-link rear setup, a wider track, variable-assist electric power steering and Cadillac's Magnetic Ride Control system with Tour and Sport modes.

Super Cruise’s failsafes

Even though Super Cruise is not a fully autonomous system, it incorporates redundancies like those used in aircraft to ensure failsafe operation. Before taking off on a 700-mile, 11-hour test drive of the system — and putting my life in its hands without my hands on the wheel — I sat down with Daryl Wilson, lead development engineer for Super Cruise, to get a deep dive into the system and its critical safety backups. Autoblog: First, what makes Super Cruise different from similar systems? Wilson: The key differentiator for Super Cruise is hand-free driving. It's an industry first in that respect. Our competitors require the driver at minimum to place their hands on the wheel with some frequency to ensure that the car knows that the driver is there. We don't. Two key technologies allow us to do this. One is our Driver Attention System, which is our methodology for making sure the driver is engaged with the vehicle and engaged with the road. This is a driver assist system, not a fully autonomous system. So it requires driver engagement. We use an infrared camera that constantly monitors the driver's face to determine the direction they're looking. We're looking for the driver to be what we call on-road — not on the center stack, not to left or right or down. That's all done by the tracking of the face. We also track that the eyes are open. It's infrared because at night you need to illuminate the face and you can't be shining a light into the driver's face. Then we have our lidar mapping that provides a foundation for control and redundancy to ensure safe performance. Autoblog: How does the mapping act as a redundant feature? Wilson: This system is only for use on divided, controlled access highways. What I mean by a divided highway is something more than a painted line between you and oncoming traffic. Whether that's a grassy area in between the lanes or a concrete barrier, anything that separates you from oncoming traffic. That's the divided highway part. The controlled access part is entrance ramps and exit ramps. Not with roads that cross at grade, with traffic crossing at the same level. To do that we geofenced these roads to ensure that operation is only allowed in these conditions. We don't just recommend you use it there; we ensure that you only use it there.