Cusco LSD 251 L15 Type RS 1.5-Way Limited Slip Differential

The Cusco LSD 251 L15 Type RS is a competition-proven, 1.5-way limited slip differential engineered for performance enthusiasts who demand precise handling and durable construction. Built from high-tension chrome molybdenum steel, this clutch-type LSD is designed to withstand the rigors of both track competition and aggressive street driving while delivering noticeably improved traction and response over the factory open differential.

The Type RS design utilizes coil springs within the pressure rings to absorb and gently apply initial torque, resulting in initial torque that is 50–70% lower than conventional cone plate-type LSDs. This translates to reduced driveline friction, less clutch plate wear, and more predictable, progressive engagement — making it equally at home on the street as on the circuit. The Cusco Type RS LSD completed an entire All Japan Gymkhana Championship season without requiring a single overhaul.

Key Features:

• High-tension chrome molybdenum steel construction for long-lasting durability under extreme loads
• Initial torque 50–70% lower than conventional cone plate LSDs for smoother, more responsive engagement
• Precision coil springs in the pressure plate ensure consistent and steady engagement force
• Cusco's exclusive radially-cut clutch plate grooves promote instant oil movement for improved efficiency and cooling
• Large oil windows enhance fluid circulation and heat dissipation throughout the unit
• Low clutch plate pressure reduces plate sticking and wear compared to traditional cone plate designs
• Reduced chattering for a quieter, more refined driving experience
• Locking characteristics are adjustable via clutch plate stacking configuration

Understanding Cusco LSD Engagement Configurations:

• 1-Way LSD: Engages only under acceleration; reverts to open differential behavior on deceleration. Ideal for front-wheel drive and AWD front-axle applications.
• 1.5-Way LSD (this unit): Fully engages under acceleration with mild engagement during deceleration, reducing the tendency for understeer compared to a 2-way setup. The balanced, all-around choice for performance street and track driving.
• 2-Way LSD: Engages fully on both acceleration and deceleration. Best suited for rear-wheel drive and AWD rear-axle applications where aggressive driving and large-angle drifting are preferred.

The Cusco Type RS 1.5-Way LSD is the preferred choice for drivers who want a significant handling upgrade with progressive, predictable differential behavior — delivering faster lap times and improved traction without sacrificing drivability.