Porsche 928 S 1986 Driver Manual page 54

The shift points given here are theoretical road speeds. There may be certain variations in practice as a result of manu-
facturing tolerances, the temperatures of components and automatic transmission fluid as well as tyre slip.
In selector position " D " the automatic up-
shifts and downshifts are dependent on a
combination of road speed and accelerator
pedal position. The shift points vary between
the part throttle and full throttle positions.
50
Upshifts
A) When driving with gentle pressure on the
accelerator pedal when the lever is in se-
lector position D or 3, the transmission shifts
from 1st to 2nd gear at approx. 21 km/h
(13 mph), from 2nd to 3rd gear at approx.
28 km/h (17 mph) and from 3rd to 4th gear
at approx. 43 km/h (27 mph) in order to
save fuel and to reduce noise levels.
In order to achieve optimum engine braking
effect in selector position 2, upshift from 1st
to 2nd gear does not take place until approx.
80 km/h (50 mph).
B) During full throttle acceleration the trans-
mission holds 1st to 3rd gears longer for
better acceleration. It then shifts from 1st
to 2nd gear at approx. 62 km/h (38 mph),
from 2nd to 3rd gear at approx. 117 km/h
(73 mph) and from 3rd to 4th gear at approx.
188 km/h (117 mph).
C) If you press the accelerator pedal down
beyond the full throttle pressure point
to actuate the electrical switch behind the
accelerator pedal (kick-down) upshifts take
place at still higher road speeds to provide
maximum acceleration. The upshift from
1st to 2nd gear does not take place until
approx. 67 km/h (42 mph), from 2nd to 3rd
gear at approx. 124 km/h (77 mph) and from
3rd to 4th gear at approx. 197 km/h (122
mph).