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.
Six-speed manual transmission with Active Rev Match
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:
•
Active Rev Match – anticipates the next gear selection and electronically “blips” the
throttle to match engine speed for a seamless gear change
•
No-lift shifting – Part of the Performance Traction Management system, it allows gear
changes without the need for the driver to take his or her foot off the gas pedal, keeping
the engine at full boost and maximum power
•
Launch control – Also part of the Performance Traction Management system, it
enables maximum off-the-line acceleration.
The TR6060 transmission is used with a dual-mass flywheel and dual-disc clutch, which deliver
greater shift quality and feel through lower inertia.
Paddle-shift eight-speed automatic transmission
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.
