Blackline BMW 3 Series E21 E30 E36 E53 E83 Z3 168 LSD Limited Slip Diff. Blackline BMW E21, E30, E36, E53, E83, Z3 Helical LSD. For vehicles fitted with 168 differential Only. E21 315, 316, 318. E21 323i without OE LSD. E30 318i and 318is. E53 X5 4.4i Auto Front diff. E53 X5 4.6is Front diff. E83 X3 3.0d Front Axle. E83 X3 3.0sd Front Axle. Z3 Z3 1.9 Manual. Z3 Z3 2.0 Manual. Please Check Fitment is correct before purchasing! Not suitable for M3 or M models. 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. Any Items That Are Out Of Stock Or have Extended Lead Times, May Take Slightly Longer Than Normal. Consistent Quality and Customer Service. Be confident you will get what you ordered; and if by chance a problem occurs we fix the issue very fast with no quibbles! Get the item quickly and cheaply: Most of our items are either. Know it will be easy to return. We use high quality bubble lined jiffy bags for all small order to ensure a damage free transit & High Quality Double Walled Boxes for the heavier & larger items. All UK Orders are Sent Via. Class service or 24 hour courier. All orders are fully insured. Posted within 24 hours unless advert dispatch time or description states otherwise. Orders before 3pm are usually sent same day. International Orders are sent Via DHL EXPRESS. All tracking will be added to the order details as soon as it is obtained. Tracking numbers automatically attach to every order once dispatched. Problems should they occur. We go to great lengths to ensure mistakes are not made. However we are only human. If you think there is anything we can do to improve our services or product we would love to hear from you- Seriously we can only improve if we have input from our customers. We are always happy to help. SHOP BHP is a Trading Name of Brands Hatch Performance LTD.