Porsche 911 Turbo 2014 Owner's Manual page 248

14_991_Turbo_21.book Seite 246 Mittwoch, 9. April 2014 2:19 14
h
Tire Abuse
WARNING
The temperature grade for this tire is established
for a tire that is properly inflated and not
overloaded. Excessive speed, underinflation, or
excessive loading, either separately or in
combination, can cause heat buildup and possible
tire failure.
f
Do not exceed the permitted maximum speed
for the tires fitted to the vehicle.
f
Ensure that the tires are set to the correct
inflation pressure.
f
Observe the maximum load for the vehicle.
Tire pressures
h
Low Tire Pressure
DANGER
Driving the vehicle with low tire pressure increases
risk of a tire failure and resulting loss of control.
Furthermore, low tire pressure increases rate of
wear of the affected tires and causes damage.
f
Always use an accurate tire pressure gauge
when checking inflation pressures.
f
Do not exceed the maximum tire pressure
listed on the tire sidewall. (Also refer to
"Technical data").
f
Please see the chapter "TIRE PRESSURE
PLATE" on page 247.
f
Cold tire inflation pressure means: all tires
must be cold, ambient temperature maximum
68 °F (20 °C), when adjusting the inflation
pressure. Avoid sunlight striking the tires
before measuring cold pressures, since the
pressures would rise from temperature
influence.
f
Valve caps protect the valve from dust and dirt,
and thus from leakage. Always screw caps
tightly down. Replace missing caps
immediately.
246
Minor Repairs
f
Use only plastic valve caps.
f
For safety reasons, don't use tire inflating
bottles.
f
Please see the chapter "TIRE PRESSURE FOR
COLD TIRES (68 °F/ 20 °C)" on page 287.
Each tire, including the spare (if provided), should
be checked monthly when cold and inflated to the
inflation pressure recommended by the vehicle
manufacturer on the vehicle placard or tire
inflation pressure label. (If your vehicle has tires of
a different size than the size indicated on the
vehicle placard or tire inflation pressure label, you
should determine the proper tire inflation pressure
for those tires.)
As an added safety feature, your vehicle has been
equipped with a Tire Pressure Monitoring System
(TPMS) that illuminates a low tire pressure telltale
when one or more of your tires is significantly
under-inflated. Accordingly, when the low tire
pressure telltale illuminates, you should stop and
check your tires as soon as possible, and inflate
them to the proper pressure. Driving on a
significantly under-inflated tire causes the tire to
overheat and can lead to tire failure. Under-
inflation also reduces fuel efficiency and tire tread
life, and may affect the vehicle's handling and
stopping ability.
Please note that the TPMS is not a substitute for
proper tire maintenance, and it is the driver's
responsibility to maintain correct tire pressure,
even if under-inflation has not reached the level to
trigger illumination of the TPMS low tire pressure
tell-tale.
For further information on the tire pressure
monitoring:
f
Please see the chapter "TIRE PRESSURE
MENU (TIRE PRESSURE MONITORING
SYSTEM, TPMS)" on page 105.
When tires are warm, the tire pressure is
increased.
f
Never let air out of hot tires. This could cause
the tire pressure to fall below the prescribed
value.
Insufficient tire pressure can cause tires to over-
heat and thus be damaged – even invisibly. Hidden
tire damage is not eliminated by subsequently
correcting the tire pressure.
Overloading
h
Overloading Tires
DANGER
Overloading can lead to dangerous vehicle
reactions and long braking distances.
f
Do not overload your vehicle. Be careful about
the roof load.
f
If you plan to load the vehicle, first correct the
tire pressure. Tire pressure for loaded vehicle
can be found on the tire pressure plate and in
the chapter technical data.
f
Never exceed the specified axle load.