OS Giken HA091-HA Super Lock LSD for 2000-2005 Honda S2000 & Miata Turbo

Vehicle Fitment

• 2000-2004 Honda S2000 AP1/AP2 (2.0L & 2.2L I4, manual)
• 2004-2005 Mazda Mazdaspeed MX-5 Miata (1.8L I4 turbo, manual)

Features

• Patented spline-through-side-gear 1.5-way LSD design
• Up to 28 friction plates for smooth progressive lock-up
• Chemically heat-treated alloy steel gears and components
• Billet-machined LSD case for maximum strength and uniformity
• Low preload with full 100% lock capability under load
• Quiet operation with street-friendly progressive locking
• Tuneable initial torque, pressure ring springs, ramps
• No break-in or rebuild required - ready for immediate use

Specifications

• Type: 1.5-way limited-slip differential
• Lock timing: 336
• Friction plates: 24-28 total (depending on spec)
• Preload setting: Standard "10S" (stock feel)
• Case material: Billet high-grade steel alloy
• Compatible drivetrain: RWD manual transmission only
• Weight: approx. 16 lb (7.3 kg)

Included Components

• 1x OS Giken Super Lock LSD (HA091-HA Spec-S)
• Pressure ring and cone springs (stock tuning)
• Full friction plate pack
• Installation hardware & instructions

Product Description

The OS Giken HA091-HA Super Lock limited-slip differential delivers a refined, high-performance driving experience to early-generation Honda S2000s (2000-2004 AP1/AP2) and turbocharged Miata platforms (2004-2005 Mazdaspeed MX-5). Featuring a patented spline-through-side-gear design with up to twice the friction plate capacity of typical LSDs, it guarantees smooth progressive lock-up and 100% locking under load for enhanced traction without abrupt transitions :contentReference[oaicite:0]{index=0}.

Crafted from heat-treated alloy steel, housed in a billet-machined case, and preload-tuned for stock-like initial engagement, this LSD maintains quiet, street-friendly behavior while providing serious grip for aggressive driving. Its 1.5-way design ensures controlled locking on deceleration. Tunability options include adjustable preload, ring springs, and ramp angles to tailor its behavior to track or street performance needs. Confirmed to be no-break-in-ready, it suits both daily drivers and motorsport enthusiasts :contentReference[oaicite:1]{index=1}.