Beschrijving
Alle Modelle met 188L Differential
E39 Manual – 520d, 525i, 528i, 530i, 535i, Alpina B10 3.2 (with 2.93:1 final drive), Alpina B10 3.3
E39 Auto – 525d, 535i
E46 Manual – 320d (with std 2.79 ratio), 323i, 328i, 330i, 330xd
E46 Auto – 320d, 328i, 330xd
E53 Manual Rear Diff – X5 3.0d
E60 Manual – 520d, 530i
E60 Auto – 525d (after 03/2007)
E81 Manual – 118d
E82 Manual – 120d
E83 Manual Rear Axle – X3 3.0d
E85 Manual – Z4 2.2i, Z4 3.0i
E85 SMG – Z4 3.0i
E87 Manual – 116d, 120d
E87 Auto – 120d (up to 01/2007)
E90 Manual – 318d, 320d (with final drives 7566218, 7566274), 325d, 330d, 325i (with final drive 7566172)
E90 Auto – 318d, 320d, 325d, 330d, 330dx
E92 Manual – 320d, 325d, 330d, 325i (with final drive 7519942)
E92 Auto – 320d, 325d, 330d, 330dx
F25 X3 SDrive 20d, Rear Axle
The ATB combined with BMW’s superb chassis and handling qualities allows the power to be efficiently handled, making the car faster, especially in slippery conditions.
Helical LSD Advantages:
- Equal rotational speed to both wheels
- Torque distributed according to traction
- Minimal service requirements – no clutches
- Quick reaction compared to viscous LSDs
- Gentle and progressive engagement, low noise
- Easily controlled power take-off and drifting
- Gears and body manufactured from 8620 alloy steel
- Direct replacement into stock differential
The helical LSD’s are torque biasing, that is they distribute torque between the wheels, loading more torque towards the wheel with the best traction thus improving performance and driveabitily. Especially in low grip situations.
The helical gearing manages the distribution of friction within the LSD. When torque is applied to the helical gear system it creates force that pushes the gear into the differential body, thus creating friction. Increases of torque, increases the thrust force directly proprotional to the amount of torque. This allows the LSD to cope with considerable traction imbalance even under heavy power conditions, as would be the case on exiting a powered up corner. But at low torque conditions the LSD can differentiate quietly and smoothly, thus making the differential very suitable for normal road driving. The LSD uses the popular parallel axis helical geared configuration optimised for even load distribution. They are designed with a torque bias of 5:1 this means that if one wheel loses traction then the wheel with the most grip can receive five times as much torque as the wheel that is slipping. However, five times zero is still zero, so all these helical LSD’s work best when both wheels are ‘planted’ and some traction is still available on the slipping wheel. In practice this is rarely a problem as there is always some ‘drag’ on the slipping wheel, however some drivers expertly use left foot braking to partially lock the spinning wheel.
Note – Helical LSD’s work especially well when combined with modern anti-lock braking systems.
