BMW 215LW Fully-Forged LSD Unit – F-Series N55 & B58

• Fully forged construction: Both the LSD housing and internal components are forged for exceptional strength, durability and resistance to high torque and shock loads.
• Designed for BMW 215LW differentials: Purpose-built for the 215LW differential family used across a wide range of high-performance BMW F-Series models.
• Adjustable ramp settings: Three lock profiles allow the differential behavior to be tailored to your driving style and application:
  • 30/30 — aggressive 2-way configuration for drifting and maximum locking response on acceleration and deceleration.
  • 30/60 — versatile 1.5-way setup for hill climb, rally, circuit racing, time attack and performance driving.
  • 50/65 — progressive and smooth engagement for performance street use and track days.
• Premium clutch pack: Equipped with 4 × molybdenum-ceramic clutch plates engineered for consistent locking performance and supplied with a Lifetime Warranty on the clutch plates.
• Strong mechanical preload: Provides immediate and predictable differential response without relying on electronic intervention to transfer torque between the driven wheels.
• Optimized NVH: Correct setup, preload and high-quality LSD oil provide smooth operation while maintaining strong locking performance.
• High-power ready: The fully forged architecture is designed for tuned N55 and B58 engines, high-torque diesel applications and demanding motorsport use.

• Improved traction: Transfers torque more effectively between the driven wheels, reducing unwanted one-wheel spin and improving acceleration out of corners.
• Better power delivery: Helps powerful BMW N55 and B58 models put their torque to the ground more effectively.
• Enhanced corner exit: Allows earlier and more confident throttle application when accelerating out of a corner.
• Predictable handling: Mechanical locking provides consistent and repeatable differential behavior at the limit.
• Improved drift control: Strong and adjustable locking characteristics make the car easier to initiate, balance and control under power.
• Motorsport versatility: Adjustable ramp configurations allow the same LSD platform to be optimized for street, track, drift, hill climb, rally and time attack applications.
• Built for high torque: Forged construction is engineered to withstand the demanding torque output of tuned BMW N55, B58 and high-performance diesel engines.

• Professional installation recommended: Correct carrier bearing preload, ring-and-pinion backlash and contact pattern should be checked during installation.
• Backlash setup: Always measure the original setup before disassembly and verify the final backlash and gear contact pattern after installation.
• Important: Differential compatibility should be confirmed by differential type rather than chassis or engine alone, as specifications may vary depending on production date, transmission and market.

This Fully-Forged LSD unit is designed for the BMW 215LW differential found in the following applications:

BMW 1 Series

• F20: 125d N47S1, M135i N55
• F20 LCI / Facelift: 125d B47, M135i N55
• F21: 125d N47S1, M135i N55
• F21 LCI / Facelift: 125d B47, M135i N55

BMW 2 Series

• F22: 225d N47S1, 225d B47, M235i N55
• F23: 225d B47, M235i N55

BMW 3 Series

• F30: 325d N47S1, 330d N57N, 330d xDrive N57N, 335d xDrive N57Z, 335i N55, 335i xDrive N55
• F30 LCI / Facelift: 325d N47S1, 325d B47, 330d N57N, 330d xDrive N57N, 335d xDrive N57Z, 340i B58, 340i xDrive B58
• F31: 325d N47S1, 330d N57N, 330d xDrive N57N, 335d xDrive N57Z, 335i N55
• F31 LCI / Facelift: 325d N47S1, 325d B47, 330d N57N, 330d xDrive N57N, 335d xDrive N57Z, 340i B58, 340i xDrive B58
• F34: 325d N47S1, 330d N57N, 330d xDrive N57N, 335d xDrive N57Z, 335i N55

BMW 4 Series

• F32: 425d N47S1, 425d B47, 430d N57N, 430d xDrive N57N, 435d xDrive N57Z, 435i N55, 435i xDrive N55, 440i B58, 440i xDrive B58
• F33: 425d N47S1, 425d B47, 430d N57N, 435d xDrive N57Z, 435i N55, 440i B58
• F36: 425d B47, 430d N57N, 430d xDrive N57N, 435d xDrive N57Z, 435i N55, 440i B58

*BMW differential specifications may vary by production date, transmission, drivetrain and market. If your exact vehicle configuration is not listed or you are unsure whether your car uses a 215LW differential, please contact us before ordering.

Power is only useful when it can be transferred effectively to the road. On powerful BMW F-Series models, especially tuned N55 and B58 cars, an open differential can limit traction by allowing one wheel to spin when accelerating hard or exiting a corner.

A mechanical clutch-type Limited Slip Differential improves torque distribution between the driven wheels, helping the car accelerate more effectively and behave more predictably under power. The result is improved traction, stronger corner exits and greater driver control.

For popular performance models such as the BMW M135i, M235i, 335i, 340i, 435i and 440i, a properly configured LSD is one of the most significant drivetrain upgrades available—particularly for modified, high-power, track or drift applications.

The RacingDiffs Fully-Forged 215LW LSD combines the strength required for high-torque applications with adjustable ramp geometry, allowing the differential to be configured around the way the car is actually used.