ACT HD/Performance Street Sprung Clutch Kit - Nissan SR20DET | Heavy Duty Pressure Plate + Performance Street Disc (NS1-HDSS)

Upgrade your SR20DET's clutch with the ACT NS1-HDSS HD/Performance Street sprung clutch kit. Combining ACT's most popular Heavy Duty pressure plate with their Performance Street sprung disc, the NS1-HDSS delivers significantly increased clamping force and improved durability over the factory clutch while maintaining street-friendly drivability — the ideal balance for modified SR20DET builds.

Key Features:

• ACT Heavy Duty (HD) pressure plate
• ACT Performance Street sprung disc
• Increased clamp load over factory
• Exclusive diaphragm design
• Four-stage heat-treated diaphragm
• Precision cover stampings
• Premium organic disc material with high copper content
• Steel-backed lining for burst strength
• Reduced marcel for faster shift action
• Street-friendly sprung hub design
• ACT quality and engineering

Performance Benefits:

• Increased Clamping Force: HD pressure plate handles more power than factory clutch
• Improved Durability: Premium materials and heat-treated diaphragm for longer service life
• Faster Shifts: Reduced marcel in disc for quicker shift action
• Street Drivability: Sprung hub disc maintains smooth engagement for daily use
• Better Heat Transfer: High copper content organic material dissipates heat effectively
• Greater Burst Strength: Steel-backed lining handles high-RPM engagement

Specifications:

• Brand: ACT
• Part Number: NS1-HDSS
• Kit: Heavy Duty pressure plate + Performance Street sprung disc
• Pressure Plate: ACT Heavy Duty (HD)
• Disc: ACT Performance Street (SS) - sprung hub
• Disc Material: Premium organic with high copper content
• Lining: Steel-backed
• Weight: 18.8 lbs (complete kit)
• Barcode: NS1-HDSS

Fitment Information:

• Nissan SR20DET - S13 Silvia / 180SX
• Nissan SR20DET - S14 Silvia / 200SX
• Nissan 240SX (S13/S14) with SR20DET engine swap
• Note: Verify your specific SR20DET application and transmission before ordering
• Note: Flywheel sold separately - inspect or replace flywheel at time of clutch installation
• Installation: Professional installation recommended

What's Included:

• ACT Heavy Duty pressure plate
• ACT Performance Street sprung disc
• Installation instructions
• Note: Flywheel, release bearing, and alignment tool sold separately
• Note: Inspect release bearing and pilot bearing at time of installation

Installation Notes:

• Professional installation recommended
• Inspect flywheel surface - resurface or replace if worn, grooved, or heat-cracked
• Replace release bearing and pilot bearing at time of clutch installation
• Use clutch alignment tool during installation
• Torque pressure plate bolts in a star pattern to manufacturer specifications
• Break in new clutch with 500-1000 km of moderate use before aggressive driving
• Avoid slipping clutch during break-in period

ACT Heavy Duty (HD) Pressure Plate:

The ACT Heavy Duty pressure plate is ACT's most popular pressure plate, and for good reason. ACT's exclusive diaphragm design increases clamp load over the factory pressure plate while reducing deflection under load — deflection is the enemy of consistent clutch engagement, as a deflecting diaphragm changes the clamping force as the clutch wears. All ACT diaphragms undergo a four-stage heat-treating process that provides unparalleled performance and durability under the thermal stress of repeated clutch engagement. The precision cover stampings provide rigidity and consistency, ensuring the pressure plate maintains its geometry and clamping force throughout its service life.

ACT Performance Street (SS) Sprung Disc:

The Performance Street disc is ACT's most popular street disc, designed to complement the HD pressure plate with improved performance while maintaining street drivability. The disc features premium organic friction material with a high copper content, which provides better heat transfer than standard organic materials — critical for dissipating the heat generated during clutch engagement. The steel-backed lining provides greater burst strength and durability compared to standard lining construction, handling the high-RPM engagement demands of a modified SR20DET. The reduced marcel (the wave spring between the friction material and the disc) allows faster shift action by reducing the cushioning effect during engagement, providing a more direct, responsive feel without the harshness of a solid disc.

Sprung Hub Design - Street Drivability:

The "SS" in NS1-HDSS denotes a sprung hub disc, which uses torsional springs in the hub to absorb driveline shock and vibration. This sprung design is what makes the Performance Street disc suitable for daily driving — the springs cushion the engagement and smooth out driveline vibration that would otherwise be transmitted through the drivetrain. Solid hub discs (used in ACT's Extreme and Race disc options) provide more direct power transfer but transmit more vibration and can be harsh for street use. For SR20DET builds that see regular street use alongside performance driving, the sprung hub Performance Street disc is the correct choice.

HD/SS - The Most Popular ACT Combination:

The HD pressure plate paired with the Performance Street sprung disc (HDSS) is ACT's most popular clutch combination across all platforms, and for good reason. The HD pressure plate provides meaningful clamping force increase over factory without the excessive pedal effort of ACT's Xtreme pressure plate, while the Performance Street disc provides improved performance and durability while maintaining street drivability. This combination is ideal for modified SR20DET builds running bolt-on modifications, forced induction upgrades, or engine builds targeting moderate power levels. For builds targeting very high power levels, ACT's Xtreme pressure plate with a 6-puck or solid disc may be more appropriate.

SR20DET Platform:

The Nissan SR20DET is one of the most celebrated turbocharged 4-cylinder engines in JDM performance history, powering the S13 and S14 Silvia and 180SX/200SX, and widely used in S13/S14 240SX engine swaps in North America. The SR20DET's combination of strong aftermarket support, tuning potential, and compact dimensions has made it a favourite for drift, time attack, and street builds worldwide. The factory clutch is adequate for stock power levels but quickly becomes a limiting factor as boost and power increase. The ACT NS1-HDSS is a proven upgrade for SR20DET builds at all stages of modification.

When to Upgrade Your Clutch:

Signs that your SR20DET's clutch needs replacement or upgrade include clutch slip under hard acceleration (RPM rises without corresponding vehicle acceleration), difficulty engaging gears, burning smell during normal driving, or a clutch pedal that engages very high or very low in its travel. If you're upgrading your SR20DET's power output through boost increases, engine modifications, or a full engine build, upgrading the clutch proactively is strongly recommended — a slipping clutch under high power is both a performance limitation and a safety concern.

Why ACT?

ACT (Advanced Clutch Technology) is one of the most respected clutch manufacturers in the performance industry, trusted by professional racers, drift teams, and enthusiasts worldwide. Their engineering focus on diaphragm design, heat treatment, and friction material selection has produced clutch components that consistently outperform the competition in durability and performance. ACT's extensive application coverage and proven track record on the SR20DET platform make them the go-to choice for Nissan performance builds.

Perfect For:

• Nissan SR20DET S13/S14 Silvia builds with bolt-on modifications
• S13/S14 240SX SR20DET swap builds
• SR20DET builds with moderate forced induction upgrades
• Daily-driven SR20DET builds needing improved clutch durability
• Drift and street builds wanting ACT HD quality with street drivability

Perfect For: Nissan SR20DET S13/S14 Silvia and 240SX swap builds seeking ACT NS1-HDSS HD/Performance Street clutch kit for increased clamping force, improved durability, and street-friendly drivability.

Pro Tip: Replace the release bearing and pilot bearing at the same time as the clutch — the labour to access them is already done, and installing a new clutch on worn bearings risks premature clutch failure and another full transmission removal.

HD + Performance Street: ACT's most popular combination. Increased clamp load. Sprung hub for street drivability. Premium organic disc with high copper content. Steel-backed lining. Four-stage heat-treated diaphragm.

Upgrade your SR20DET's clutch with ACT NS1-HDSS — Heavy Duty pressure plate, Performance Street sprung disc, proven ACT quality for S13/S14 Silvia and 240SX builds.