More aluminum is used in the lightweight multilink short-long arm front suspension. At the rear, the Cadillac has five-link independent suspension “that uses multiple outer ball joints and cross braces for optimal handling and steering precision.”
A stiff chassis and sophisticated suspension combine for a smooth ride and accurate handling, but Cadillac adds an optional Active Chassis Package to improve both. The package includes GM’s Magnetic Ride Control which uses tiny iron particles the shock absorber fluid that can be stiffened almost instantaneously with electronic controls for a smooth ride that can firm up or softens depending on the needs of the moment.
The Active Chassis Package also includes active rear steering. We’ve seen this before in other cars, and along with the Magnetic Ride Control system, ACP adds $3,300 to the bottom line. How it works is by turning the rear wheels in the opposite direction of the front wheels at low speeds to provide a tighter turning radius for parking lot maneuvers. The CT6’s slow speed turning circle is 37 feet, comparable to the smaller CTS. However, at road speeds, it steers the rear wheels in the same direction as the front—though much less—to add stability to the vehicle’s handling.
The base engine for the Cadillac CT6 is a turbocharged 2.0-liter four-cylinder. It’s rated at 265 horsepower and 295 lb-ft of torque. An eight-speed transmission is standard, along with rear wheel drive. Fuel economy is an EPA-estimated 22/31 mpg city/highway.
Two V-6 engines are available, a 3.6-liter naturally aspirated, direct injected six, and a 3.0-liter V-6 with two turbochargers. The bigger engine makes 335 horsepower and 284 lb-ft of torque, though you have to rev it out to 5300 rpm to reach its peak. Although it’s the same displacement as the 3.6-liter in other Cadillacs, this engine is an all-new clean-sheet design, with direct-injection, auto stop-start and a new quieter cam drive chain.
The 3.0-liter twin-turbo V-6, however, reaches max torque at only 2500 rpm and stays there 5100rpm and that’s a potent 400 lb-ft. The 3.0 TT also makes more horsepower than the bigger six, a healthy 404 horsepower at 5700 rpm. Going back to the lighter chassis weight because of all the aluminum, the Cadillac CT6 3.0TT weighs in at 4,085 pounds. Compare that to the Cadillac XTS. Its 3.6-liter twin-turbo V-6 makes 410 pounds and 369 lb-ft of torque over a wide spread, but the XTS also weighs a couple hundred pounds more than that CT6. Make your own conclusion.
Like the CT6’s naturally-aspirated 3.6-liter, 3.0 TT is all new from the block up. The two small turbos come up to speed more quickly than a single larger turbocharger would, and a special (patented) low volume intercooler takes less time to fill, again for quicker response. The turbines in the turbocharger are lightweight for quicker speedup, made from titanium-aluminide turbine wheels. Turbo lag? Never heard of it.