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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:    

Alonso's Cadillac team wins 2019 24 Hours of Daytona

Two-time Formula One champion Fernando Alonso won the rain-shortened 24 Hours of Daytona, overhauling Felipe Nasr two laps from the eventual finish on Sunday. The Spaniard became only the third Formula One champion to win the race, joining Phil Hill (1964) and Mario Andretti (1972). "It's amazing," Alonso told NBCSN. "Just an amazing experience with this team, from the test and now the race –- a perfect execution of the race. "Very different conditions and we've been competitive in everything –- dry, wet, night and day. Really happy for the team and all the guys." Alonso, who retired from Formula One racing after the 2018 season, said the victory would rank very high among all his accomplishments. "To win this kind of endurance racing at iconic places like Daytona means a lot," he said. "With zero experience and background in endurance before (last year) it's quite a big thing." Already the winner of last year's 24 Hours of Le Mans, the 37-year-old Alonso will attempt to complete the Triple Crown of motorsports by capturing the Indy 500 in May. Driving the Wayne Taylor Cadillac DPI, Alonso took command of the race for keeps when Brazilian Nasr failed to navigate turn one and drove into deep water, losing a 1.5-second advantage. By the time Nasr had things under control, Alonso was 12 seconds ahead. Kamui Kobayashi, Jordan Taylor and Renger vanDer Zande teamed up with Alonso for the victory in his second try in the 24-hour race which was twice red-flagged because of rain and water on the track and was halted 10 minutes early. "With all the rain, I've never seen a race like this," Team Penske boss Roger Penske told NBCSN. Alexander Rossi was the only other driver to finish in the lead lap. He took third. Italian Alex Zanardi's return to endurance racing 17 years after he lost both legs in a horrific race wreck got off to a bad start 90 minutes into the race, At the beginning of his first stint driving, Zanardi encountered a problem with his steering wheel. The 52-year-old was using a special wheel with hand controls for the car, and the connecting pins were damaged when he attempted to connect it as the car was dropped from the jack. His No. 24 BMW Team RLL team finished 32nd overall and ninth in class. Full results. Related Video: Featured Gallery 24 Hours of Daytona 2019 View 20 Photos Motorsports Cadillac daytona

Cadillac CT6 gets a plug in Shanghai, will come to US

Don't call it the third coming of the Chevy Volt. The unsurprising debut of the Cadillac CT6 PHEV in Shanghai today has a powertrain that sounds an awful lot like the one that can be found in the Volt and the Cadillac ELR. The plug-in CT6 – identical to the CT6 that debuted in New York earlier this month – has an 18.4-kWh lithium-ion battery (just like the 2016 Volt) and offers an all-electric range of around 37 miles. It also copies the "Regen on Demand" feature from the new Volt and the battery cells "use the latest generation cell chemistry found in other GM plug-in vehicles." But Cadillac President Johan de Nysschen doesn't see the two powertrains as similar in at least one important way. General Motors calls the Volt and the ELR "extended range electric vehicles" (EREV) but in a statement, de Nysschen says that the plug-in hybrid CT6 is, "an ideal platform for Cadillac to offer its first plug-in hybrid." That GM is using the PHEV terminology rather than EREV is going to be important to some, even if the practical difference is only semantic. And yes, we all understand the irony of de Nysschen – the same guy who has a history of speaking ill of plug-in cars – hyping them now. Back when he worked for Audi, he said the original Volt was too expensive for what it offered and was thus, a car for "idiots." Speaking in Shanghai today, de Nysschen said the new CT6 PHEV was, "an EV without any of the disadvantages or range constraints," according to Automotive News. If the batteries are similar to GM's other EREV/PHEV cars, the CT6 powertrain is at least different. The ELR uses a 1.4-liter engine, while the new Volt has a 1.5-liter four-cylinder mill. The CT6, on the other hand, has a 2.0-liter turbo four-cylinder engine with direct injection. There is also an "all-new rear wheel electric variable transmission (EVT) with exclusively designed motors," that will give the CT6 PHEV, "smooth, spirited acceleration." The EVT is a two-motor-unit that uses three planetary gears. Maximum overall system output is 335 horsepower and 432 pound-feet of torque. Perhaps most interesting for American audiences is the fact that GM's press release, available below, makes multiple references to US-market sales of the PHEV. Official details on the EV range and fuel economy will be made available closer to the car's US launch.