2010 Alfa Romeo Giulietta four wheel drive

110
GETTING
TO KNOW
YOUR CAR
SAFETY
STARTING
AND DRIVING
IN AN
EMERGENCY
SERVICING AND
MAINTENANCE
TECHNICAL
SPECIFICATIONS
CONTENTS
VDC SYSTEM
(Vehicle Dynamics Control)
This is an electronic system that controls vehicle stability in the
event of tyre grip loss, helping maintain directional control. The sys-
tem is capable of recognising potentially dangerous situations in
terms of the stability and intervenes automatically on the brakes
in a differentiated manner for the four wheels in order to provide
a stabilizing torque.
The VDC, in turn, includes the following systems:
❍Hill Holder
❍ASR
❍Brake Assist
❍MSR
❍CBC
❍“ELECTRONIC Q2” (“E-Q2”)
❍DST
❍RAB
SYSTEM INTERVENTION
This is signalled by warning lightáblinking on the instrument
panel to inform the driver that stability and grip conditions are
critical.
SYSTEM ACTIVATION
The VDC system switches on automatically each time the engine
is started and cannot be switched off.
HILL HOLDER SYSTEM
This system is an integral part of the VDC system and it is provided
to facilitate starting on slopes.
It is activated automatically in the following instances:
❍uphill: car standing on a road with a gradient of more than 5%,
engine on, brake pedals pressed and gearbox in neutral or gear
(other than reverse) engaged;
❍downhill: car at a standstill on a road with a gradient higher
than 5%, engine running, brake pedal pressed and reverse gear
engaged.
When setting off the VDC system control unit maintains the brak-
ing pressure at the wheels until the engine torque required for de-
parture is reached or for approximately 2 seconds, allowing your
right foot to be moved easily from the brake pedal to the acceler-
ator.
If the car does not start off after this time, the system will deacti-
vate automatically by gradually releasing the brake force. A noise
may be heard: this means that the car is about to start moving.
IMPORTANT the Hill Holder system should not be used as a hand-
brake. Do not leave the vehicle without having engaged the hand-
brake, switched off the engine and engaged a gear.
001-130 Alfa Giulietta EN 5ed 26-07-2010 16:34 Pagina 110

112
GETTING
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YOUR CAR
SAFETY
STARTING
AND DRIVING
IN AN
EMERGENCY
SERVICING AND
MAINTENANCE
TECHNICAL
SPECIFICATIONS
CONTENTS
“ELECTRONIC Q2” SYSTEM (“E-Q2”)
The “Electronic Q2” system uses the braking system to create an
effect similar to a limited slip differential.
The front braking circuit, when accelerating around a corner, acts
on the inside wheel to increase the drive to the outside wheel (in-
creased load), dynamically and continuously distributing the torque
between the front drive wheels according to driving and road con-
ditions.
The system, combined with Mc Pherson front suspension, allows
particularly effective, sporty driving.
DST SYSTEM (Dynamic Steering Torque)
This function integrates Dual Pinion active steering into the opera-
tion of VDC. For particular manoeuvres, VDC controls the steering
to actuate a steering torque and assist the driver in the best pos-
sible way. The system operates the brakes and steering in a coor-
dinated manner to increase the suspension and safety level of the
car as a whole. The steering provides addition torque on the steer-
ing wheel.
RAB SYSTEM (Ready Alert Brake)
(“Dynamic” mode only)
By pre-approaching the brake pads (front and rear) after rapid ac-
celerator release, this function provides prompter braking and re-
duces stopping distance.
BRAKE ASSIST
(emergency braking assistance)
The system, which cannot be turned off, recognises emergency
braking (on the basis of the brake pedal operating speed) and
speeding up the response of the braking system. The Brake
Assist function is deactivated in the event of VDC system fault.
MSR SYSTEM
(Motor Schleppmoment Regelung)
This system is an integral part of the ABS, that intervenes, if there
is a sudden change to a lower gear, restoring torque to the engine,
thereby preventing excessive drive at the drive wheels which, es-
pecially in poor grip conditions, could lead to a loss in stability.
CBC SYSTEM (Cornering Braking Control)
This system improves the distribution of the braking pressure at the
four wheels (to fully exploit the grip available on the ground) when
braking round bends when the ABS intervenes. This improves stop-
ping distances and above all vehicle stability when cornering.
001-130 Alfa Giulietta EN 5ed 26-07-2010 16:34 Pagina 112

158
GETTING
TO KNOW
YOUR CAR
SAFETY
STARTING
AND DRIVING
IN AN
EMERGENCY
SERVICING AND
MAINTENANCE
TECHNICAL
SPECIFICATIONS
CONTENTS
SNOW TYRES
Use snow tyres of the same size as the normal tyres provided
with the car. Alfa Romeo Authorized Services will advise you on the
most appropriate tyre for use.
Only use these tyres in the event of ice or snow on the roads.
For the type, pressures and specifications of the snow tyre to be
used, follow carefully the instructions given in the “Wheels” para-
graph of the “Technical specifications” chapter.
The performance of these tyres is considerably reduced when the
tread depth is less than 4 mm. If this is the case, replace them.
Due to their specific features, the performance of snow tyres is
much lower than that of standard tyres in normal conditions or on
long motorway stretches. You should therefore use them only in
the conditions for which they were designed. The performance of these tyres is considerably reduced when the
tread depth is less than 4 mm. If this is the case, replace them.
All four tyres should be the same (brand and track) to ensure greater
safety when driving, during braking and better driveability. Re-
member that it is inappropriate to change the direction of rotation
of tyres.
The maximum speed for snow tyres marked “Q”
is 160 km/h, while it is 190 km/h for “T” tyres
and 210 km/h for “H” tyres. You should, howev-
er, always stick to the speed limits of the highway code.
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