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Page 1 of 2 Next >>  The 2016 ATS-V features the first application of the Cadillac Twin Turbo engine in the V-Series, with unique features that expand its performance range and support track capability.The more powerful iteration of the Twin Turbo 3.6L V-6 delivers an estimated 455 horsepower (339 kW) and 445 lb-ft of torque (603 Nm), and is backed by a standard six-speed manual transmission - with Active Rev Match, no-lift shifting and launch control - or an available paddle-shift eight-speed automatic transmission. With the eight-speed automatic, the ATS-V reaches 60 mph from a standstill in only 3.9 seconds and achieves a top speed of more than 185 mph (299 km/h). "The Cadillac Twin Turbo brings a new dimension of technologically advanced performance to the V-Series," said Richard Bartlett, assistant chief engineer. "Delivering great power with world-class sophistication, it marks another large step forward in the product-driven expansion of Cadillac in the compact luxury segment." Unique to the ATS-V's Twin Turbo are turbochargers with lightweight, low-inertia titanium-aluminide turbines, lightweight titanium connecting rods and an efficient, patented low-volume charge-air cooler, which contribute to optimal boost production and more immediate power delivery. With approximately 90 percent of the Twin Turbo's peak torque available from 2,400 rpm to 6,000 rpm, the engine has broad torque curve that is conveyed in a feeling of responsive, sustained power at all rpm levels. Additionally, a high-performance lubrication system is designed to maintain optimal oil pressure and ventilation during high-lateral driving maneuvers typically encountered on a track. Even the turbochargers are designed for track performance, with the compressors matched for peak efficiency at the engine's peak power levels, which means they demand less heat rejection (intercooling) for higher sustained power during track driving. "Track capability was one of the primary objectives for the Cadillac Twin Turbo in the ATS-V," said Bartlett. "It expands the performance envelope of the ATS range, while advancing Cadillac's legacy of delivering purposeful technology that inspires passion." The twin, low-inertia turbochargers' featherweight titanium-aluminide turbines are used with vacuum-actuated wastegate control for precise, responsive torque production. In fact, the titanium-aluminide turbines reduce rotating inertial load by 51 percent, compared to conventional Inconel turbine wheels. That means less exhaust energy - which spins the turbines - is wasted in stored inertial loads. In practical terms, that means the relatively small size of the turbochargers and their lightweight turbines foster more immediate "spooling," which virtually eliminates lag, for an immediate feeling of power delivery. They produce up to 18 pounds of boost (125 kPa). A single, centrally located throttle body atop the engine controls the air charge from both turbochargers after the temperature is reduced in the intercooler. This efficient design also contributes to more immediate torque response, while reducing complexity by eliminating the need for a pair of throttle bodies. Unique vacuum-actuated wastegates - one per turbocharger - are used with the Twin Turbo for better management of the engine's boost pressure and subsequent torque response for smoother, more consistent performance. They are independently controlled on each engine bank to balance the compressors' output to achieve more precise boost pressure response. The wastegates also work in concert with vacuum-actuated recirculation valves to eliminate co-surge from the turbos - a condition that can result in dynamic flow reversal, such as the moment immediately after the throttle closes. This overall system integration contributes to the engine's smoother, more consistent feeling of performance. The Cadillac Twin Turbo's patented, manifold-integrated water-to-air charge cooling system also contributes to more immediate torque response, because the compressors blow through very short pipes up to the intercooler. With no circuitous heat-exchanger tubing, there is essentially no lag with the response of the turbochargers. In fact, airflow routing volume is reduced by 60 percent when compared with a conventional design that features a remotely mounted heat exchanger. "It is a very short path from the turbos to the throttle body," said Bartlett. "The compressors draw their air directly from the inlet box and send their pressurized air through the intercooler basically immediately, for a tremendous feeling of power on demand." The charge-cooling heat exchangers lower the air charge temperature by more than 130 degrees F (74 C), packing the combustion chambers with cooler, denser air for greater power. Also, the air cooler system achieves more than 80 percent cooling efficiency with only about 1 psi (7 kPa) flow restriction at peak power, which contributes to fast torque production. Page 1 of 2 Next >> |
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