Automatic Speed Control - Porsche 928 1980 Owner's Manual

1 Set/accelerate
2 Reset
3 Cancel

Automatic Speed Control

The automatic speed control allows you to
maintain a constant cruising speed of 30 mph
(50 km/h) or higher, without actuating the
accelerator pedal. Any manual operation,
such as accelerating, gearshifting or braking
can be done independent of the automatic
speed control. The spring loaded control
lever operating the automatic speed control
is located just below the wiper/washer lever.
CAUTION: While driving with the automa-
tic speed control set, do not bring shift
lever into the Neutral position which will
result in very high engine rpm and conse-
quent damage.
To operate the automatic speed control
- Accelerate to the desired cruising speed,
push lever toward instrument cluster
(arrow 1) and release. This sets the cruis-
ing speed and stores it in a memory.
- After a second or two automatic speed
control will take over, and you can remove
your foot from the accelerator pedal. The
set cruising speed will be maintained au-
tomatically.
- Passing: when you want to drive faster
for a brief moment, for example when
passing another vehicle, actuate the ac-
celerator. When you take your foot off the
accelerator pedal, the preset speed will
automatically be resumed.
- Gearshifting: when shifting gears, the
automatic speed control is only disengag-
ed as long as the clutch pedal is depress-
ed. The preset speed will be resumed as
soon as you take your foot off the clutch
pedal.
- Braking and stopping: whenever you
apply the brake or come to a stop, the
. automatic speed control is disengaged.
Move the lever down (arrow 2), and the
preset speed will be resumed.
- Switching system off: to switch the au-
tomatic speed control off, move the lever
toward you (arrow 3). To resume the pre-
set speed, move the lever down (arrow 2).
To change the preset cruising speed
Increase preset speed:
- Accelerate by depressing the accelerator
pedal. When the desired speed is reached
move the lever up (arrow 1) and take the
foot off the accelerator pedal. Now the
new cruising speed is set and stored in the
memory.
- As an alternative, you can hold the lever
in the up position (arrow 1), without de-
pressing the accelerator pedal. The car
will accelerate on its own. When the de-
sired speed is reached, release the lever.
Decrease preset speed:
- Apply the brake, which will disengage the
automatic speed control. When the ve-
hicle has slowed down to the desired
speed, move the lever up (arrow 1) to set
the new cruising speed.
- As an alternative, disengage the automa-
tic speed control by moving the lever to-
ward you (arrow 3). When the vehicle has
slowed down to the desired speed, move
the lever up (arrow 1) to register the new
cruising speed in the memory.
Note: When driving up a hill, if the engine
power is insufficient in a particular gear, the
speed control will be disengaged automatic-
ally. Shift to a lower gear to avoid lugging
the engine.
CAUTION: Do not use the automatic
speed control when driving on winding
or slippery roads, or in varying and dense
traffic.
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