In addition to having a hybrid option available and segment-leading technology, Cadillac’s new full-size Omega-based CT6 sedan will introduce a 3.0-liter twin-turbocharged V6 engine that will be the “most powerful six-cylinder gas engine in the segment,” vice president of global product development Mark Reuss said during yesterday’s investor briefing at Milford Proving Ground.
The Detroit News reports the new gasoline V6 will be mated to an eight-speed transmission coupled with start-stop technology. Just as General Motors’ eight-speed transmission is tailored for use in the Corvette and various full-size trucks and SUVs, it will also likely receive slight alterations for use in the CT6.
How much power the engine will make is not clear. BMW’s N55 inline-six-cylinder engine makes 315 horsepower and 331 lb-ft of torque in the 740Li, while Audi’s 3.0-liter TFSI engine makes 328 horsepower and 325 lb-ft in the A8. Other competitors in the segment also offer V6 engines, such as Hyundai’s 294 horsepower and 255 lb-ft 3.3-liter GDI V6 under the hood of the Equus or the Kia K900’s 311 horsepower and 293 lb-ft 3.8-liter V6.
In addition to engines, Reuss talked about how the CT6 will be much lighter than anything before it. GM is planning to apply their patented mixed material body structure to the full-size sedan. This way of manufacturing combines a patented welding solution with different high- and regular-strength steel and aluminium stampings, which results in a vehicle with 20 fewer parts.
“We will create with the CT6, the world’s most advanced body structure,” Reuss said. “And it’s not aluminum. It’s a stronger, smarter, safer premium luxury vehicle.”
Reuss said GM took 20 different parts used to assemble the front body pillar and replaced them with one single casting. The result is a full-size sedan that is 53 lbs lighter than the mid-size CTS on the road today, which is one of the lighter vehicles in the premium mid-size segment.