The 911 Turbo and 911 Turbo S

VarioCam Plus.
VarioCam Plus is a variablevalve
timing system on the inlet
side which also features twostage
valve lift. For excellent
smooth-running performance,
better fuel economy, and fewer
emissions, combined with
greater power and torque.
The timing of each valve
is steplessly and electrohydraulically
controlled by
means of a rotary vane adjuster.
For optimal responsiveness
during the warm-up phase,
VarioCam Plus will select
the higher valve-lift setting
and delayed valve timing.
At medium revs and low
engine loads, the lower
valve-lift setting is selected
and timing advanced
in order to reduce fuel
consumption and emissions.
For maximum power and
torque, the higher lift setting
is selected and the timing
of the valves is advanced.
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VarioCam Plus
Engine management.
The EMS SDI 3.1
engine management
system ensures optimal
performance at all times.
It is responsible for all
engine-related functions
and assemblies, resulting
in improved fuel economy,
emissions levels, and
performance, regardless
of driving style.