Cusco LSD-1C7-FT Type-RS Spec-F Limited Slip Differential - 1-Way Front

The Cusco LSD-1C7-FT Type-RS Spec-F is a high-performance mechanical limited slip differential engineered for front axle applications. This 1-way LSD is specifically designed for Toyota GR Yaris and GR Corolla models, delivering enhanced traction and improved cornering performance for both street and track use.

Type-RS Spec-F Technology:

The Spec-F variant features Cusco's innovative Flat Friction Disc (FFD) design, which provides milder initial engagement characteristics compared to standard LSDs. The precision-polished FFD surface generates uniform and smooth frictional force, resulting in smoother operation and reduced power loss—ideal for street driving and circuit applications. This advanced design combines the FFD inner plates with outer tabbed MZ grooved plates to maintain optimal oil flow and deliver consistent, predictable performance.

Key Features:

• Initial torque pre-load: 2.4 kg-m for gentle, progressive engagement
• 1-way configuration activates under acceleration only, eliminating understeer on deceleration
• Coil spring pressure system provides consistent performance with minimal torque loss over time
• High-strength chrome molybdenum steel case, gears, and components for extreme durability
• Oil Through System with large oil openings for superior cooling and lubrication
• Radially-cut MZ plate grooves enable instant oil movement for improved efficiency
• Polished pressure ring contact surfaces ensure even clutch plate engagement
• 35-degree cam angle optimized for front-wheel drive and AWD front axles
• Lower friction design extends rebuild intervals compared to traditional cone-spring LSDs

Performance Benefits:

The 1-way design is specifically suited for front-wheel drive vehicles and front axles of AWD systems, activating during acceleration while remaining inactive during braking and coasting. This eliminates the understeer commonly associated with 2-way differentials while maximizing traction out of corners. The result is improved lap times, better throttle response, and enhanced mid-corner control without sacrificing street drivability.

Cusco's Type-RS series has proven itself in All Japan Gymkhana Championship competition, with teams completing entire seasons without requiring overhauls. The Spec-F's lower initial torque setting makes it particularly well-suited for drivers seeking a balance between aggressive performance and refined street manners, making it an excellent choice for dual-purpose vehicles.