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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:    

Mother's Day Suggestion No. 2,506

With Mother's Day coming up, we're always looking for new gift ideas to celebrate the occasion, but hot laps around a track might not be the best suggestion for Darius Khashabi. In a video posted on YouTube, Khashabi straps his mom into the passenger seat of his C6 Corvette Z06 for some laps around Sonoma Raceway (formerly Infineon Raceway) at "60 percent" with comical results.
Now this isn't the first time Mama Khashabi has gotten seat time in her son's car around a track, as his YouTube page shows him pulling a similar stunt - with similar results - around Mazda Raceway Laguna Seca last year. Scroll down for the video, but know that the action really gets going at around the 1:40 mark.

2016 Chevy Cruze is lighter, loaded [UPDATE]

UPDATE: Live photos and video of the reveal have been added at the end of the story. Chevrolet revealed the second-generation Cruze Wednesday, promising a larger, more efficient car that drives better than the sedan it replaces. We're particularly excited about the new turbocharged, 1.4-liter four-cylinder engine, which makes 153 horsepower, an upgrade from the outgoing 1.8-liter naturally aspirated engine's 138 hp. Torque climbs even more significantly, from 148 pound-feet to 177 in the new mill. Peak twist can be called up between 2,000 and 4,000 rpm, which should make performance easy to access. Combined with a lighter architecture that slashes the Cruze's curb weight by 250 pounds (although the actual curb weight hasn't been released), the new four-door can hit 60 miles per hour in a respectable eight seconds. That's not hot hatchback territory, but it should be more than suitable for the average consumer. That same consumer should also appreciate the new engine's economy. The Cruze now returns an even 40 miles per gallon on the highway and will cover 530 miles on a single tank, all the while running on plain old 87-octane fuel. There's also a diesel-powered Cruze model, although Chevy didn't release specific details, aside from saying that it will arrive in dealers in 2017, over a year after the gas-powered model's early 2016 on-sale date. Despite the 250-pound drop in weight, the new Cruze has grown significantly. Its wheelbase is now the longest in the segment, with 106.3 inches of sheetmetal between the front and rear axles compared to 105.7 in last year's model, while the sleek new body cuts the coefficient of drag to just 0.29. The overall length increases from 181 inches to 183.7, though the new model is nearly an inch lower overall. That's both good news and bad news for interior space. Rear legroom is up from 35.4 to 36.1, but headroom is down in both the front and backseats by over half an inch. Tech fans, meanwhile, will appreciate the new standard MyLink display. The seven-inch touchscreen is compatible with both Android Auto and Apple CarPlay, while an optional eight-inch display will be offered, as well. 4G LTE wi-fi, heated rear seats, a heated steering wheel, and wireless phone charging will also be offered as an optional extras. New safety features include blind-spot monitoring with cross-traffic alert, lane keeping assist, and forward collision warning.