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 ATS-V Coupe
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| Cadillac ATS-V Coupe |
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<< Prev Page 2 of 2  Because the Cadillac Twin Turbo is based on the same architecture as the existing naturally aspirated 3.6L V-6, it benefits from many proven technologies including dual-overhead camshafts, variable valve timing and direct injection.It also has unique features that strengthen the foundation to support the greater cylinder pressure that comes with turbocharging:
The unique cylinder heads feature a high-tumble intake port design that enhances the motion of the air charge for a more-efficient burn when it is mixed with the direct-injected fuel and ignited in the combustion chamber. The topology of the pistons, which feature centrally located dishes to direct the fuel spray from the injectors, is an integral design element of the chamber design, as the piston heads become part of the combustion chamber with direct injection. "The high-tumble heads were developed with advanced modeling programs that helped us determine the optimal design in less time and with less trial and error," said Bartlett. "Literally hundreds of simulations were performed to optimize the port flow, injector spray angle and pattern, and piston topology to produce a highly efficient yet powerful combustion chamber." Large, 38.3-mm intake valves and 30.6-mm sodium-filled exhaust valves enable the engine to process tremendous airflow. In some conditions, the continuously variable valve timing system enables overlap conditions - when the intake and exhaust valves in a combustion chamber are briefly open at the same time - to promote airflow scavenging that helps spool the turbochargers quicker for faster boost production. Hardened AR20 valve seat material on the exhaust side is used for its temperature robustness, while the heads are sealed to the block with multilayer-steel gaskets designed for the pressure of the turbocharging system. The heads also feature integral exhaust manifolds with upper and lower water jackets that provide uniform temperature distribution and optimal heat rejection. The standard TREMEC TR6060 six-speed manual transmission has a strong track record proven in the supercharged CTS-V series. It is updated for ATS-V with selectable technologies that enhance driver control to help produce optimized shifts that can lead to faster lap times:
The new Hydra-Matic 8L90 eight-speed paddle-shift automatic transmission is available in the ATS-V. Designed and built by GM, it delivers world-class shift times that rival the best dual-clutch designs. For performance driving, the transmission offers full manual control via steering wheel paddles. A new transmission-control system and unique algorithms deliver shift performance that rivals the dual-clutch/semi-automatic transmissions found in many supercars - but with the smoothness and refinement that comes with a conventional automatic fitted with a torque converter. The transmission controller analyzes and executes commands 160 times per second. Wide-open throttle upshifts are executed up to eight-hundredths of a second quicker than those of the dual-clutch transmission offered in the Porsche 911. Smaller steps between gears, compared to GM's six-speed automatic, keep the engine within the sweet spot of the rpm band, making the most of ATS-V's turbocharged horsepower and torque to optimize performance on and off the track. Additional performance-enhancing features include Performance Algorithm Shift and launch control via the Performance Traction Management system. << Prev Page 2 of 2 |
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