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1 Series - 3 and 5 doors E81/E87 (2007 - ...) - Transmission and Electronics

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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.

Last Updated on Monday, 12 April 2010 14:43  

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