Driving Performance; Torque Distribution - Porsche 911 Targa User Handbook Manual

Dynamic engine mounts.
The S model is equipped with light-alloy
The dynamic engine mounts are included 20-inch wheels as standard. The visual
as part of the Sport Chrono Package. The effect is sporty and dynamic.
electronically controlled system minimises
the oscillations and vibrations of the entire The large tyre size improves both ride
drivetrain, especially the engine, and comfort and track performance. Rolling
combines the benefits of a hard or soft resistance, dry braking distances and
engine mounting arrangement. tyre weight are all comparatively low.
The stiffness and damping properties Porsche Stability Management (PSM).
of the engine mounts are adapted to As standard, the new 911 Targa 4 models
changes in driving style and road surface are equipped with Porsche Stability
conditions. Handling is noticeably more Management (PSM) which maintains
stable under load change conditions and stability even at the limits of dynamic
48
in fast corners. Whenever a less asser-

driving performance.

tive driving style is adopted, the dynamic
engine mounts provide a greater level Sensors continuously monitor the direc-
of comfort. tion, speed, yaw velocity and lateral
acceleration of the car. PSM uses this
Wheels. information to calculate the actual
The 911 Targa 4 is equipped with 19-inch direction of travel at any given moment. If
wheels as standard. These are light- the car begins to oversteer or under-
weight alloys featuring a classic sporty steer, PSM applies selective braking on
design. Tyre sizes are 235/40 ZR 19 individual wheels to restore stability.
and 295/35 ZR 19 at the front and rear,
respectively.
For fuel consumption and CO emissions, please refer to page 103.
2
Under acceleration on wet or low-grip road is distributed to the outside rear wheel,
surfaces, PSM improves traction using inducing an additional rotational pulse
the automatic brake differential (ABD) and (yaw moment) around the vehicle's
anti-slip regulation (ASR). The result is a vertical axis. This results in a direct and
high level of driving stability and safety sporty steering action as the car enters
combined with extraordinary agility. the corner.
Porsche Torque Vectoring (PTV and At low and medium vehicle speeds, PTV
PTV Plus). and PTV Plus significantly increase agility
PTV in conjunction with the manual and steering precision. At high speeds
gearbox, or PTV Plus with Porsche and when accelerating out of corners,
Doppelkupplung (PDK), are available as the rear differential lock ensures greater
options for the new 911 Targa 4 and driving stability. Whichever system is
are standard on the new 911 Targa 4S. fitted, it interacts with Porsche Stability
Both systems actively enhance vehicle Management (PSM) to improve driving
dynamics and stability by braking the stability on a range of surface conditions,
rear wheels as the situation demands. including the wet and snow.
In addition, a mechanical (PTV) or elec-
tronic (PTV Plus) rear-axle differential
lock is responsible for infinitely variable

torque distribution.

When the car is driven assertively into
a corner, moderate brake pressure is
applied to the inside rear wheel. Conse-
quently, a greater amount of drive force
Authentic style | Chassis 49