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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:    

2016 Chevy Volt powertrain technical details

The last time General Motors launched a Chevy Volt, it was operating without really knowing how people would use the plug-in hybrid. Sure, it had experience with the EV1, but the Volt was a new kind of car, and you can see in the archives just how much time GM spent explaining this fresh, new powertrain to potential customers. Then, once the vehicle was released, the company collected voluntary data from a large number of owners to learn about their driving and charging habits. The company also asked them what they wanted most in the new version. There's got to be an algorithm buried somewhere in GM headquarters that was used to take all of the numbers GM collected and spat out the headline figures for the 2016 Volt: 50 miles of EV range and 41 miles per gallon. Another important number – price – is something GM isn't talking about yet (expect it in April or May), but the company is sharing some powertrain details about the upcoming car. At a preview lunch in Detroit last week for the SAE 2015 Hybrid & Electric Vehicles Technologies Symposium that's happening now in California, GM engineers Peter Savagian (who is presenting a paper on the new inverter used in the updated Volt) and Tim Grewe (talking about the entire second-generation powertrain) sat down with AutoblogGreen to tell us about the Volt's all-new propulsion system: The overall gist is that the new Voltec 5ET50 drive unit is lighter, smaller and more powerful thanks to a redesigned two-motor traction drive. As previously reported, the new engine is a 1.5-liter DOHC four-cylinder that offers 101-horsepower (at 5,600 RPM). Grewe said it's "great for range extension." The electric motor side of the powertrain offers 149 motoring horsepower from a two-motor, continuously variable transaxle. Initially, the new engine will be made in Mexico. GM will move production to Flint, MI during the first year it makes the 2016 Volt. The battery is slightly bigger in the new Volt – 18.4 kWh compared to 16.5 in the current-gen – and will have less range variation in the cold. GM is also using more of the overall capacity in the pack in the 2016 Volt than in previous versions, but is not saying how much more. GM is not ready to publish acceleration times just yet, but the 2016 Volt has improved numbers, especially when going from 30-60 miles per hour. Most everything on the new powertrain has become more efficient compared to the first-gen Volt.

Recharge Wrap-up: Lexus CT 200h is NWAPA's favorite hybrid, 'No Charge to Charge' in LA

The Northwest Automotive Press Association (NWAPA) has given the Lexus CT 200h its Favorite Hybrid title. It named the compact luxury hybrid its favorite of 2014 at its Drive Revolution in Portland (where it also named the new Volkswagen Golf TDI the Northwest Green Car of the Year). According to NWAPA president Nik Miles, the CT 200h earned the honor for "impressive combination of state-of-the-art small car luxury and hybrid technology." For 2014, the Lexus CT200h got an updated front end, including the spindle grille we've been seeing on new Lexus vehicles, plus a redesigned steering wheel and sliding sun visors. Read more in the press release below. Chevrolet credits the Malibu for helping make stop-start mainstream. Chevrolet started including stop-start technology standard in Malibus equipped with the four-cylinder engine. Chevy has sold about 83,000 of that model, so 97 percent of 2014 and 2015 Malibu sales include stop-start. Now, that technology has made its way into the 2015 Impala. With drivers idling an average of 16 minutes a day, stop-start can significantly reduce harmful emissions and save fuel. According to Navigant Research, we can expect annual sales of cars equipped with stop-start technology to surpass 55 million by 2022. Read more in the press release below. Nissan Leaf customers in Los Angeles will get access to free charging beginning August 15. Nissan is extending its "No Charge to Charge" promotion to LA, which will allow customers to charge at public charging stations at no cost. Leaf customers - including those who bought or leased their car from the participating dealerships on or after July 1 - will get an EZ-Charge card, allowing them to use ChargePoint, Blink, CarCharging, AeroVironment and NRG eVgo chargers for free. Rapid chargers can charge the Leaf's battery to 80 percent in 30 minutes. Nissan plans to offer the "No Charge to Charge" in at least 14 more markets in the US, bringing the total to 25, within the next year. See the press release below for more details. California will get six all-electric school buses for three school districts as part of a demonstration program. The California Energy Commission awarded a grant of $1.4 million for the program to National Strategies LLC; this is in addition to a $2.2-million grant from the South Coast Air Quality Management District. The EV buses use vehicle-to-grid technology, allowing them to sell energy back to the grid when it is needed.