Cadillac CT6 with Twin-Turbo 3.0L V6 (Video)

A new 3-liter V6 will launch with the all-new Cadillac CT6 and be offered in the brand's other sedans, Cadillac announced Friday.

The company detailed the powertrain offerings that will be in their new flagship sedan, set for a March 31 unveiling as part of the New York Auto Show. The CT6 will be one of the first vehicles to show off General Motors' new engine family.

A mainstream offering is expected to be a new, naturally aspirated, 3.6-liter V6 with 335 horsepower and 284 lb.-ft. of torque. That's up from 14 horsepower from the 3.6 V6 currently offered in the ATS and CTS.

But in keeping with modern turbocharging trends, a new 3.0-liter twin-turbo V6 with 400 horsepower and 400 lb-ft torques will also be introduced. In addition to revised mechanicals for greater efficiency, these new engines also sport cylinder deactivation and start/stop. Cadillac says it expects a 9-percent fuel economy bump from this engine over the outgoing 3.6 that's in a whole bunch of GM products.

Those two Cadillac sedans will also get the new 3.6-liter engine, although the 3.0-liter turbo is for now reserved for the CT6. An 8-speed automatic will be the transmission for these engines, doing away with the six-speed unit that's been offered on the outgoing engine.

“Cadillac’s elevation on the world stage is driven in great part by its advanced powertrain technology and the all-new 3.0L Twin Turbo powers past the traditional segment leaders with higher degrees of the performance and refinement their reputations were built on,” said Rich Bartlett, assistant chief engineer.

“Torque is the pulling power of an engine and the new 3.0L Twin Turbo delivers it with confidence-inspiring smoothness and progression,” said 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.”

Cadillac officials confirmed engine details CEO Johan de Nysschen let slip last month, including that the CT6 would also offer a turbocharged four, which is probably going to be the 2.0-liter, 270-horse unit in the ATS and CTS. It might not be a slouch, given the CT6 is all about lightness in its construction.