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Mazda RX-8 Super LSD & Mazda MX-5 NB Fuji LSD Upgrade Kit
RD4078
265,00€239,00€
Mazda RX-8 / MX-5 NB – Super / Fuji LSD Upgrade Kits
Fix OEM cone failures • 4× stronger locking • Street, track & drift ready
The Mazda RX-8 and Mazda MX-5 NB are true driver’s cars, but their factory Limited Slip Differentials can share one major weakness: small friction cones pushed by weak springs. In the Mazda RX-8 Super LSD and selected Mazda MX-5 NB Fuji LSD units, these cones can wear or break, causing loss of traction, weak preload and inconsistent locking.
RacingDiffs developed dedicated upgrade kits for these LSD types, replacing the fragile cone design with a proper clutch-based performance solution. Each variant is tailored to the exact dimensions of its LSD unit, so please select the correct version for your application.
Kit Variants – RX-8 Super LSD / MX-5 NB Fuji LSD
- Mazda RX-8 – Super LSD Upgrade Kit: Dedicated kit designed specifically for the RX-8 factory Super LSD carrier.
- Mazda MX-5 NB – Fuji LSD Upgrade Kit: Dedicated kit designed specifically for the MX-5 NB factory Fuji LSD carrier.
Important: RX-8 and MX-5 NB versions are similar in concept, but they are not the same kit. Always choose the correct variant before ordering.
How the RacingDiffs Upgrade Fixes the OEM Weakness
The OEM Super / Fuji LSD design uses small friction cones behind the spider gears, preloaded by relatively weak springs. These cones are the Achilles’ heel of the design – they:
- Wear quickly or break, even on low-mileage cars
- Cause weak or inconsistent locking
- Reduce traction during corner exit, drift initiation and hard driving
- Make the car feel unpredictable when you need grip the most
Our upgrade removes the weak cone-based friction system and replaces it with proper clutch plates, stronger springs and preload shims, turning the OEM LSD into a more reliable, performance-oriented unit.
What’s Included in Each Kit
- High-performance clutch plates – replace fragile OEM friction cones
- Precision preload shims – help set the correct locking force
- 4× stronger springs – dramatically increase clamping and response
- All parts sized specifically for either RX-8 Super LSD or MX-5 NB Fuji LSD
The result is up to 4× better performance and vastly improved reliability compared to the stock cone-based design.
Key Benefits
- Dedicated variants for Mazda RX-8 Super LSD and Mazda MX-5 NB Fuji LSD
- Replaces weak cones with durable clutch plates
- 4× stronger springs for stronger and faster LSD response
- Improved preload for better traction and cornering stability
- Helps eliminate common OEM cone failures
- More predictable locking behavior during spirited driving, track days and drifting
- Retains the OEM differential housing while greatly improving performance
Fitment & Recommended Use
Designed for:
- Mazda RX-8 equipped with the factory Super LSD
- Mazda MX-5 NB equipped with the factory Fuji LSD
Not designed for:
- Mazda MX-5 NA viscous LSD or Torsen LSD
- Mazda MX-5 NB Torsen LSD
- Mazda MX-5 NC Super LSD
- Mazda MX-5 ND LSD
If you are unsure which LSD type your car has, you can:
- Check the differential markings and internal LSD design
- Compare the internal cone-style LSD mechanism
- Send us photos and VIN so we can help confirm the correct kit
Recommended for owners who demand consistent traction, stronger preload and predictable locking behavior on road, track or drift events.
Why Choose RacingDiffs for Your Mazda LSD?
- Dedicated upgrade kits for each specific LSD type — no universal compromises
- Track-proven clutch technology and high-quality materials
- Huge improvement in grip, control and reliability over the OEM cone design
- Ideal solution for rebuilding and upgrading tired factory Mazda LSD units
- Worldwide express shipping and technical support
Result: Your RX-8 or MX-5 NB gets the LSD performance it should have had from factory.
