3J Driveline NXG Plate-Type Limited Slip Differential for Mazda MX-5 NA 1.8 & All NB
From fast-road and track day to all-out race or drift applications, the 3J Driveline NXG Plate-Type Limited Slip Differential can be set up exactly to suit your requirements. The amount of pre-load and ramp angles are fine-tuned for each application, affecting how the differential locks under acceleration and braking.
3J Driveline differentials are designed and manufactured in the UK, meaning the warranty and after-sales support are exceptional. Each plate-type differential is fully rebuildable, so if it is used in extreme operating conditions—such as racing and time attack—it can be serviced instead of replaced. Furthermore, 3J diffs are designed with two different ramp angle specs on each bevel gear, so the behaviour of the differential can be fine-tuned without purchasing any new parts.
Plate-type Limited Slip Differentials have a cross pin that rides up a ramp on the bevel gear, applying pressure to the friction plates and locking both sides of the differential together. For example, a shallow ramp angle of 25 degrees will allow the cross pin to slide up the bevel gear easily, applying more locking force to the differential. Steep 90-degree ramp angles prevent any additional load from being applied, relying on pre-load to lock the differential instead.
Pre-load is used to set how much force is applied to the friction plates before any engine torque is applied to the differential. More pre-load requires less effort to lock the differential, locking it sooner. Due to how plate-type differentials lock, slight noise and wheel judder can be expected at low speeds.
Accel/Decel Ramp Angle (degrees) | Preload (lb-ft) | Diff Way | Notes | |
---|---|---|---|---|
Fast Road | 50/90 | 25-35 | 1-way | |
Track | 40/90 | 55-65 | 1-way | |
Race | 30/90 | 65-75 | 1-way | |
Rally | 30/90 | 65-75 | 1-way | For more oversteer bias 30/60 or 45/45 ramp angles can be specified. |
Sprint | 40/90 | 65-75 | 1-way | |
Kaaz Style Road/Track | 40/60 | 40-45 | 1.5-way | Ideal Fast Road/Track combination option |
Drift | 45/45 | 65-75 | 2-way |
Suits NA 1.8 & all NB MX-5s with push-in driveshafts
For a full breakdown, see our plate type blog here
Please note unless a stock figure is shown, 3J diffs are made to order. The usual lead time is around 4 weeks.