Cadillac CT6 to debut 3L twin-turbo V6, new 3.6L V6

The new Cadillac CT6 sedan will debut GM’s 3-litre twin-turbo V6 and 3.6-litre V6, both of which are said to be based on a new engine architecture.

The new 3-litre twin-turbo V6 will churn out 400hp (298kW) and 400 lb-ft (543Nm) when used in the new 7-Series/S-Class-chasing Cadillac CT6. Thanks to its two turbochargers, the new motor develops 133hp (99kW) per litre.

According to GM, the new 3-litre engine is first to mate a twin-turbo configuration with cylinder deactivation and automatic engine stop/start. In concert, these features are said to be boost fuel economy by 6 percent.

The engine is able to shut down two of its cylinders, and operate as 2-litre V4 under light loads.

GM also claims that the 3-litre twin-turbo V6 will be a Cadillac exclusive, although no exclusivity time frame has been announced.

For the new CT6 flagship sedan, which debuts at the New York Auto Show at the beginning of April, the 3-litre V6 will be mated to the 8L90 8-speed automatic transmission.

The company’s new 3.6-litre V6 naturally aspirated engine develops 335hp (250kW) and 284 lb-ft of torque (385Nm).

Featuring an aluminium block, double overhead cams, cylinder deactivation and automatic engine stop/start, the new engine is claimed to be 9 percent more fuel efficient than the previous 3.6-litre V6.

In the CT6, the atmo 3.6-litre V6 will be paired with the all-new 8L45 8-speed auto with paddle shifters.