BMW
Media
Information
5/2009
Page 39
Triple progress with two additional gears: gearshift dynamics up,
comfort up, efficiency up.
With the transmission offering an even wider range of increments, the driver is
able to use above all the highest gear at far lower engine speeds. And thanks to
the use of eight gears, the gaps between the individual gears are smaller than
before despite the broader range of increments.
Obviously, this enhances the sporting character of the transmission and,
therefore, the dynamic philosophy of the vehicle again so typical of BMW.
While accelerating, for example, the harmonious flow of gears into one another
ensures a particularly consistent and smooth build-up of speed on the road.
The smaller differences between the transmission ratios likewise serve to
enhance gearshift comfort, changing gears involving only a small change in
engine speed.
With reaction and gearshift times even shorter than on the former six-speed
automatic, the driver and passengers enjoy even greater motoring comfort and
driving dynamics all in one. When shifting up or down one or two gears only
one clutch has to be opened, direct determination of the right gear ensuring
extremely short response and gearshift times also when shifting more than two
gears.
Even when shifting down from eighth to second gear for spontaneous and
powerful acceleration, the entire process is conducted as a direct gearshift
requiring only one clutch to be opened. This configuration is indeed particularly
beneficial to a supreme style of motoring in the BMW 5 Series Gran Turismo,
allowing the driver to use the higher gears most suited for greater efficiency and
smoothness more often than before, while benefitting from the car’s maximum
power and performance spontaneously and without the slightest delay.
The only slight increase in the number of components compared with the
former six-speed automatic gives the new eight-speed automatic transmission
an unusually high standard of internal efficiency. Gear mesh efficiency, as it is
called, exceeds the level of 98 per cent in each gear.
Sixth gear serves as a direct gear and therefore avoids frictional losses
altogether.
The low weight of the new transmission almost exactly the same as on the
former six-speed automatic again helps to increase the overall efficiency of
the car. In all, minimum converter slip, the high degree of internal efficiency,
| Categories | BMW 5-Series Manuals, BMW Manuals |
|---|---|
| Tags | BMW 530d, BMW 535i, BMW 550i, BMW F07, BMW Gran Turismo, Brochure and Catalogue |
| Model Year | 2010 |
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| Document File Type | |
| Copyright | Attribution Non-commercial |
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