Technical data

3
5
Introduction
Sequential M gearbox SMG 3
New 7-speed SMG
A new 7-speed sequential M gearbox (SMG)
has been developed for the E60 M5. The
SMG 3 is designated SMG Getrag 247.
In addition to the special functions such as
launch control, hill ascent assistant, drive logic
and tyre teach-in function, the SMG 3 is the
first sequential M gearbox that has been
specifically developed for automated
operation. The central gearshift shaft has been
replaced by individual selector rods.
The hydraulic gearshift unit is a part of the
gearbox casing and is no longer designed as
an add-on part. Compared to the SMG 2 the
gearshift times have been shortened by 20 %.
Essentially, these shorter gearshift times have
been achieved by individual selector rod
operation and the use of carbon fibre friction
cones in the synchronizer rings that facilitate
shorter synchronization times through their
higher load bearing capacity.
Initialization procedures designed to ensure
the system functions precisely may also be
necessary after performing work on the
vehicle that is not directly related to the
gearbox.
3 It is essential that the information provided
in the repair instructions is complied with for
this purpose. 1
The power is transmitted from the engine to
the gearbox by a dual-mass flywheel supplied
by LUK and a two-disc dry clutch supplied by
Fichtel und Sachs.