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BMW 188K Blackline helical diff
BMW 188K Blackline helical diff

BMW 188K Blackline helical diff

  • exc. GST exc. GST

Awaiting Stock.

E38,E39,E46,E53,E60,E70,E82,E83,E85,E87,E89,E90,E92,F10 Helical LSD for vehicles fitted with 188K differential. / please ask for drawing to check

Suits:-

  • E38 728i Auto
  • E39 Manual - 520i, 523i
  • E39 Auto - 523i, 530i
  • E46 Manual - 320i (with 188l casing), 325i, 325ti, 325xi, 328i
  • E46 Auto - 318d, 323i, 325i, 328i (3.46: ratio), 330i
  • E53 Manual Rear Diff - X5 3.0i
  • E53 Auto Rear Diff - X5 4.4i, X5 4.6is
  • E60 Manual - 520i
  • E60 Auto - 520d, 520i, 525i, 535i (SMG), 530i , 535i, 535xi
  • E63 630i Manual & Auto
  • E70 X5 3.0d Auto Rear
  • E70 X5 35ix Rear
  • E82 Manual - 125i, 128i
  • E82 Auto - 123d, 125i, 135i
  • E83 Manual Rear Axle - X3 3.0d
  • E83 Auto Rear Axle - X3 2.0d
  • E85 Manual - Z4 2.5i, Z4 3.0si
  • E85 Auto - Z4 2.5i, Z4 3.0si, Z4 2.5si, Z4 2.5si (SMG), Z4 3.0i
  • E85 Alpina Z Roadster S 3.4
  • E87 Manual - 130i
  • E87 Auto - 118d, 120d (03/07 - 09/08), 123d, 130i
  • E89 Manual - Z4 sDrive 23i
  • E89 Auto - Z4 sDrive 23i, Z4 sDrive 30i
  • E90 Manual - 320d (with final drive 7591074), 320i (with 188k casing), 325i (with final drive 7591015), 328xi, 330i
  • E90 Auto - 320d (with final drive 7591017), 320i (with 188k casing), 325i, 328i, 330i, 335i (with final drive 7572055), 335xi
  • E92 Manual - 325i (with final drives 7529109, 7591015), 328i, 330i
  • E92 Auto - 320d (with final drive 7591017), 325i, 328i, 330i, 335i (with final drive 7572055), 335xi
  • F10 Manual - 535i
  • F10 Auto - 535i

 

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
Blackline Helical LSD's - How They Work

The Blackline 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 Blackline 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 Blackline 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.