The 911 Turbo and 911 Turbo S

The second function is the
motorsport-derived gearshift
strategy. Using this, Porsche
Doppel kupplung (PDK) is geared
up for the shortest possible shift
times and optimal shift points
for maximum acceleration.
A key component of the
Sport Chrono Package Plus
with dynamic engine mount
system is the timer mounted
on the dashboard. Porsche
Communication Management
(PCM, page 83) has a special
performance display to view,
store, and evaluate segment
times or other driving times.
It shows the total driving time,
segment distance, segment
number, and the segment
times recorded so far. You
can view the current fastest
segment and the remaining
range until empty. Traveled
distances can be recorded and
benchmark times defined.
The personal memory function
of the Sport Chrono Package
Plus can also be used to
store personalized settings
for a range of systems,
including the “Welcome Home”
lighting or air conditioning.
Operation of the dynamic
engine mount system.
Stiffness and softness as
required. That’s the principle
behind the dynamic engine
mount system now being
offered for the first time as part
of the optional Sport Chrono
Package Turbo. Essentially,
it’s an electronically controlled
system for controlling the
stiffness of the engine mounts.
The engine is bolted to the body
using two mounts and follows
Newton’s law of inertia, namely
that a body will continue to move
in a uniform straight line unless
it is made to change its direction
by a force acting upon it.
· 57 ·
Put more simply: When you
are driving into a curve in your
new 911 Turbo, the vehicle will
follow your steering but, at first,
the mass of the engine won’t.
This means that the rear of
the vehicle is pushed outward
because of the inert forces from
the engine’s mass acting on it.
The new dynamic engine
mount system minimizes
this effect. The steering
angle and longitudinal and
lateral acceleration values
are constantly recorded by
sensors, and the stiffness
of the two engine mounts is
changed automatically according
to the driving style. This is
achieved using a magnetizable
(magnetorheological) fluid and an
electrically generated magnetic
field. The magnetizable particles
align with each other, and
the fluid’s viscosity changes.
This alters the stiffness and
absorption of the engine
mounts: softer for greater
comfort and less vibration
when driving normally, harder
for a more direct driving feel
when performance-driving.