Cadillac wasn’t kidding when they started talking about a “bespoke” high-output V6 for the upcoming CT6 sedan, and today they’ve released details about the new engine, coded LGW. The most stunning feature of the engine is it’s output: 400 horsepower and 400 ft/lbs of torque, with peak torque numbers occurring from 2,500 RPM to 5,000 RPM. That should be plenty to overcome the CT6’s size. Based very loosely on the 3.6 V6’s architecture, the LGW has a 10% smaller cylinder bore (3.385″) but utilizes the same stroke (3.377″) while running a lower compression ration (9.8:1, from 11.5:1). Even so, the pistons receive a special steel insert in the top ring land to support the cylinder pressures that the engine will see when the turbos are climbing up to their rated 18 PSI of boost. Enlarged water jackets surround the cylinders to aid in cooling the block down, while the turbochargers take air straight from the inlet boxes and send the compressed air through Cadillac’s water-to-air intercooler before meeting the single throttle body. Both turbos feature titanium-aluminide turbines, which reduce inertia loading and increase efficiency and have vacuum-operated waste gates.
We won’t have to wait too long to see how it will actually work, either. The CT6 will be officially unveiled at the New York Auto Show on March 31, 2015.