SKU: MZ101-HA
OS Giken Mazda RX8/RX7 FD3S/RX7 13BT (MT Only) Super Lock LSD MZ101-HA
The OS Giken Super Lock LSD MZ101-HA is a clutch-type limited slip differential built for Mazda RX-7 FC (1987-1991 Turbo 13BT), FD3S (1993-2002), and RX-8 (2004-2011) manual transmission models. This direct replacement unit distributes torque actively to both rear wheels for sharper corner exits and stable handling under power. Drivers gain confident grip for autocross drifting and spirited road use with its ramp-controlled locking action.
Key Features
- 2-Way Clutch Operation: Locks differential on acceleration and deceleration phases for even power delivery through turns and braking zones
- Adjustable Preload: Set initial torque from 20 to 120 Nm via shims to match street track or drift preferences
- High-Capacity Clutch Pack: 10 friction plates handle up to 500 Nm torque capacity without slip or wear
- Chromoly Steel Gears: Forged SCM415 side and pinion gears resist shock loads and maintain shape under racing stress
- 50-Degree Ramp Angle: Quick response time engages full lock progressively for smooth predictable behavior
Product Notes
- Manual transmission models only direct bolt-in replacement for stock open or viscous LSD
- Fill with OS Giken LSD oil after install for peak clutch life and function
- Perform 500 km break-in with gradual power application and oil change at 500 km
Installation Notes
- Professional installation recommended.
- Drain stock diff fluid remove OEM unit and bolt in MZ101-HA with provided gaskets
- Compatible with OEM mounts hardware and axles no cutting or welding required
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1988 | Mazda | RX-7 | 10th Anniversary |
| 1993-1995 | Mazda | RX-7 | Base |
| 1993 | Mazda | RX-7 | R1 |
| 1994-1995 | Mazda | RX-7 | R2 |
| 1993-1995 | Mazda | RX-7 | Touring |
| 1987-1991 | Mazda | RX-7 | Turbo |
| 2008 | Mazda | RX-8 | 40th Anniversary Edition |
| 2004-2007 | Mazda | RX-8 | Base |
| 2008-2011 | Mazda | RX-8 | Grand Touring |
| 2009-2011 | Mazda | RX-8 | R3 |
| 2005 | Mazda | RX-8 | Shinka |
| 2008-2011 | Mazda | RX-8 | Sport |
| 2008-2009 | Mazda | RX-8 | Touring |
Why Choose OS Giken?
- Backed by wins in D1 Grand Prix drifting and Super Taikyu endurance racing
- Assembled by hand in Japan using aerospace-grade processes
- Engineered for 100000+ km service life in competition environments
Frequently Asked Questions
- Q: Will MZ101-HA fit my 1990 Mazda RX-7 Turbo manual?
A: Yes it bolts directly into 1987-1991 Mazda RX-7 Turbo MT rear differentials replacing stock unit completely - Q: What materials are used in the gears and clutches?
A: Forged SCM415 chromoly steel gears and carbon-kevlar friction plates for heat resistance and strength - Q: Does it come with a warranty and what install tips?
A: One-year limited warranty on defects professional install advised with torque wrench and LSD gear oil
Shipping & Handling
- Method: UPS Ground or FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Heavy-duty double-walled box 24 x 18 x 16 inches
- Weight: 56 lbs
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