The flagship sedan will be available with a 3.0-liter twin-turbocharged V6, delivering 400 horsepower and 400 lb-ft of torque. GM claims it is one of the most power-dense V6 engines ever produced, with 133 horsepower per liter — 27 percent greater than BMW’s 3.0-liter twin-turbo V6 used in the 740Li, and 29 percent above the supercharged V6 found in the Audi A7.
The turbo system is said to be similar to the design used in the ATS-V, integrating titanium-aluminide turbine wheels and a low-volume air-charge cooler. Peak torque is sustained between 2,500 rpm through 5,000 rpm.
“Torque is the pulling power of an engine and the new 3.0L Twin Turbo delivers it with confidence-inspiring smoothness and progression,” said assistant chief engineer Rich Bartlett. “In fact, the potency of the torque across the rpm band is matched only by the satisfaction of the horsepower created as those revs climb quickly to 6,500 rpm.”
The CT6 will also be available with a naturally-aspirated 3.6-liter V6 built upon the same engine architecture, with SAE-rated output of 335 ponies and 284 lb-ft of twist.
Both engines share a stiffer aluminum block and polymer-coated pistons that help reduce friction. The four-cam phasing system further improves efficiency by enabling late inlet valve closing in certain conditions, while the new ‘targeted’ cooling system focuses on the engine’s hottest areas and results in faster warm-up. A stop/start system and two-cylinder deactivation are also credited with reducing fuel consumption by approximately nine percent compared to GM’s current engines.
The technology is claimed to be quieter than competing engines, measured as 5 dB below the Audi 3.0-liter TFSI engine and 4 dB under the Infiniti 3.7-liter V6.
The Cadillac CT6 is due to make its global debut in less than two weeks.
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