ACT ZM8-HDR4 HD/Race Rigid 4-Pad Clutch Kit for Mazda RX-8

ZM8-HDR4 kit features ACT's most popular Heavy Duty pressure plate. ACT Heavy Duty pressure plates use exclusive diaphragm design to increase clamp load, reduce deflection and maximize clutch life. All diaphragms endure a four-stage, heat-treating process for unparalleled performance. ACT pressure plates have precision cover stampings to provide rigidity and consistency. ACT's 4-pad rigid race discs are made with high quality, ceramic friction materials. The chrome-moly hub is heat-treated for strength and durability. The lightweight, rigid design allows for quicker shifts and smooth, trouble-free service. With the 4-pad rigid race disc, engagement is harsher, but shifting is faster. The 4-pad rigid race disc is well-suited for the smaller disc sizes in smaller engines. HD/Race Rigid 4 Pad Light to moderate pedal effort, aggressive engagement, increased gear rattle; Moderate friction life, extended by ACT's exclusive diaphragm design, rigid design may increase spline wear; Carefully engineered, precisely assembled, accurately balanced, uses select ceramic friction materials for high heat tolerance and maximum performance; Recommended for race use only; 100% clamp load tested and dynamically computer balanced for smooth high RPM reliability

• "Excellence in Performance", backed by the best one-year warranty in the industry!

The ACT ZM8-HDR4 HD/Race Rigid 4-Pad Clutch Kit is engineered for race-focused Mazda RX-8 applications requiring fast shifting, high heat tolerance, and reliable performance at elevated engine speeds. This kit combines ACT's Heavy Duty pressure plate with a rigid 4-pad ceramic race disc to deliver increased clamp load and aggressive engagement.

The ACT Heavy Duty pressure plate uses an exclusive diaphragm design to reduce deflection, improve clutch life, and provide consistent clamping force. Its diaphragm is processed through a four-stage heat-treating process, while the precision-stamped cover improves rigidity and consistency. The pressure plate is 100% clamp-load tested and dynamically computer balanced for smooth, dependable high-RPM operation.

The rigid 4-pad race disc features select ceramic friction material for excellent heat resistance and rapid gear changes. Its heat-treated chrome-moly hub delivers strength and durability, while the lightweight rigid construction supports quick shifts and responsive performance. Engagement is harsher than a full-face street disc and may increase gear rattle or spline wear, making this clutch kit best suited for race use and competition vehicles. ACT backs the ZM8-HDR4 with its industry-leading one-year warranty.

Fitment: Designed for select 2004-2011 Mazda RX-8 applications. Confirm the vehicle year, engine configuration, and clutch compatibility before installation.

Features:

• Heavy Duty Pressure Plate: ACT's exclusive diaphragm design increases clamp load, reduces deflection, and helps maximize clutch service life.
• 4-Pad Ceramic Race Disc: Select ceramic friction materials provide high heat tolerance and aggressive engagement for rapid shifting.
• Rigid Chrome-Moly Hub: Heat-treated chrome-moly construction improves strength and durability under demanding race conditions.
• Balanced High-RPM Performance: The assembly is 100% clamp-load tested and dynamically computer balanced for consistent operation.

Fitments:
2004 Mazda RX-8 Base
2005 Mazda RX-8 Base
2005 Mazda RX-8 Shinka
2006 Mazda RX-8 Base
2007 Mazda RX-8 Base
2008 Mazda RX-8 40th Anniversary Edition
2008 Mazda RX-8 Grand Touring
2008 Mazda RX-8 Sport
2008 Mazda RX-8 Touring
2009 Mazda RX-8 Grand Touring
2009 Mazda RX-8 R3
2009 Mazda RX-8 Sport
2009 Mazda RX-8 Touring
2010 Mazda RX-8 Grand Touring
2010 Mazda RX-8 R3
2010 Mazda RX-8 Sport
2011 Mazda RX-8 Grand Touring
2011 Mazda RX-8 R3
2011 Mazda RX-8 Sport

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: false
Units Per Sku: 1