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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:    

The story of the 2014 Chevrolet SS: "Luxury, power, refinement, handling"

Not including the women and men who built it, the 2014 Chevrolet SS has only been seen in person by a piddling number of people - fewer humans than would fill the gymnasium at a high school volleyball game. Not including the men and women who built it, no one has driven it. Even so, it is already saddled with two controversies: the way it looks and the way it shifts.
First to that shifting. Did we love the last Americanized Holden, the awesomely sportsome Pontiac G8 GXP, and its six-speed manual? Of course. Do we wish the SS came with a six-speed manual? Of course. But we'd like a toboggan to come with a manual transmission. We'd put a manual transmission on a weasel if we could because we're just wired that way; if it moves, it should come with a stick and a clutch. Or at least the option.
Let's climb down off the ledge, though. We haven't driven the SS and we have no idea how good (or not) the automatic is. And the Hobson's Choice in transmissions when it comes to sport sedans like the BMW M5, Mercedes-Benz E63 AMG and Jaguar XFR-S and, oh yeah, cars-that-really-should-have-manuals like the Audi R8 and Nissan GT-R and Porsche 918 and every single Lamborghini and Ferrari, for instance, hasn't stopped us from enjoying what is clearly the gruesome, dual-clutched demise of Western automotive civilization. Because in spite of our ululations at the dying of the six-speed light, we understand.

2016 Chevy Volt rated at 106 MPGe, 53 miles of pure EV range

Following a string of rumors, Chevrolet and the Environmental Protection Agency have released official fuel economy numbers for the second-generation Volt. As was reported earlier today, the new and improved hybrid will cover 53 miles on pure electric power. As Chevy tells it, first-gen Volt owners cover about 80 percent of their mileage on EV power alone, so the 40-percent increase from the second-gen should lead to an even bigger reduction in gas-powered Volt mileage. Chevy expects some 90 percent of mileage to come from a plug with its new 2016 model. This newfound EV range comes thanks to the 2016 Volt's 18.4-kilowatt hour lithium-ion battery. Rated at 106 MPGe by the feds – exactly what was promised by a June leak – the 2016 Volt improves nicely on the current model's 17.1-kWh, 98-MPGe battery back. There's also a marked improvement when relying on the gas-powered on-board generator. The 1.5-liter, four-cylinder engine will happily run on regular fuel and return a still-impressive 42 miles per gallon combined rating once the battery's state of charge is depleted. Expect the freeway to cruise to be even better, although Chevy isn't ready to say by how much. Fully charged and with a full tank, drivers should expect to cover 420 miles, a 40-mile improvement over the current model. Scroll down for the official press release from Chevrolet Related Video: The Results Are In: More Range for the 2016 Volt EPA-estimated pure electric range is 53 miles DETROIT – The 2016 Volt is engineered to offer customers more of what they want: range, range and more range. The Volt's all-new second-generation Voltec extended range electric propulsion system delivers 53 miles of pure EV range, based on EPA testing. That is nearly a 40-percent improvement over the first generation Volt. Chevrolet expects many next-generation Volt owners will use power solely from their battery for more than 90 percent of trips. Today, Volt owners use battery power on 80 percent of their trips. This means that the average Volt owner may expect to travel well over 1,000 miles between gas fill ups, if they charge regularly. For the first 53 miles, the Volt can drive gas and tailpipe-emissions free using a full charge of electricity stored in its new 18.4-kWh lithium-ion battery, which is rated at a combined 106 MPGe, or gasoline equivalent. When the Volt's battery runs low, a gas-powered generator seamlessly operates to extend the driving range for a total of 420 miles on a full tank.