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1 Series - 3 and 5 doors e81/e87 (2007 - ...) |
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Page 6 of 8 Whether shifting gears yourself or in the automatic mode: six gears
are more fun.
All variants of the new BMW 1 Series come as standard with a manual
six-speed gearbox combining superior smoothness with short and precise
gearshift travel further optimised by the additional inner gearshift gate. Top
speed is in fifth gear, with sixth gear featuring a particularly long transmission
ratio in order to save fuel. And thanks to the use of lifetime oil, there is
no need to change the transmission fluid throughout the entire lifecycle of
the car.
As an alternative to the manual gearbox, both the six-cylinder BMW 130i and
the new four-cylinder gasoline and turbodiesel engines are available as an
option with six-speed automatic transmission. This sophisticated automatic
gearbox comes with new converter technology featuring an integrated torsion
damper reducing energy losses and ensuring even shorter reaction and
gearshift times. As a result, the automatic transmission version of the new
BMW 1 Series likewise offers that sporting feeling so typical of BMW.
The automatic transmission comes complete with a Steptronic function allowing
the driver to shift gears manually by means of the selector lever. And on
the BMW 130i with automatic transmission, the driver has the further option to
shift gears by means of paddles directly on the steering wheel.
Dynamic rear-wheel drive – absolutely unique in this segment.
The BMW 1 Series is the only model in the compact segment to convey the
power and performance of its engines to the road through its rear wheels.
Precisely this principle – engine at the front, drive wheels at the rear – ensures
a particularly good and smooth balance of weight as well as optimum traction.
A further advantage is that the steering itself is not affected by any kind of drive
power or adverse forces.
This clear separation of the drive and steering functions ensures a driving
experience emphasising the dynamic character of the BMW 1 Series in every
respect. An important point is the harmonious distribution of weight, with
approximately 50 per cent of the car’s overall weight resting on the front and,
respectively, rear wheels – perfect distribution of weight made possible by the
drive concept of the new BMW 1 Series.
As a result, rear-wheel drive offers ideal conditions for excellent directional
stability and safe handling.
Fundamentally speaking, the five-arm rear axle of the new BMW 1 Series is
derived from a double-wishbone rear axle where the upper and lower
wishbones are each replaced by one single track control arm. Both the large
mounting point on the wheel and the extremely stiff track control arms, the stiff
rear axle subframe, and the connection to the body of the car through thrust
rods help to ensure extremely precise wheel guidance and geometry. The
result is a high standard of agility in every respect as well as optimum acoustic
insulation of the drive axle. Yet a further point is that the rear axle on the new
BMW 1 Series is purpose-built for the particular demands and requirements of
very powerful, high-torque power units.
The front axle of the BMW 1 Series also boasts a standard of advanced
technology quite unique in the compact segment: The double-joint spring
strut tiebar axle complete with an anti-rollbar is made largely of aluminium,
ensuring the optimum combination of supreme stiffness and low weight.
And since both the track control arms as well as the swivel mounts are made
of aluminium, unsprung masses are reduced to a minimum.
This principle of lightweight construction again helps to optimise the car’s
weight distribution, making a further contribution to the superior driving
dynamics of the 1 Series and at the same time ensuring superior stiffness of
all control arms and bars. And last but not least, the hydraulically dampened
engine mounts ensure a particularly high standard of vibration and acoustic
control.
Electric Power Steering and optional Active Steering.
BMW’s new EPS Electric Power Steering complete with an integrated
Servotronic function in the 1 Series ensures a particularly high standard of
precision and motoring comfort. The big advantage of Servotronic is superior
power assistance on the steering geared to the car’s current speed on the
road. This means a greater reduction of steering forces at low speeds than at
high speeds, EPS thus ensuring a higher standard of steering precision and
comfort at all speeds on the road.
Arrangement of the servo motor parallel to the axle reduces the level of
forces and vibrations acting on the steering. And yet a further advantage is
that EPS helps to enhance fuel economy since, unlike a conventional
mechanical/hydraulic system, power assistance is provided by an electric
motor operating only when required.
The new BMW 1 Series is the only car in its segment available moreover
with Active Steering: Fitted as an option on the BMW 130i, BMW 120i, and
BMW 120d, Active Steering gears the steering transmission to the current
speed of the car, keeping movements of the steering wheel relatively small
and smooth and reducing steering forces to a minimum, for example, when
parking or manoeuvring at low speeds. At higher speeds, on the other hand,
the same movement of the steering wheel does not turn the front wheels
to the same extent, ensuring very precise steering at high speeds and making
it much easier for the driver to direct the car precisely and smoothly round
a bend.
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