The ACT ZM1-HDSS Heavy Duty Performance Street Sprung Clutch Kit pairs ACT's most popular Heavy Duty pressure plate with ACT's most popular street disc. The Heavy Duty pressure plate uses an exclusive diaphragm design to increase clamp load and reduce deflection for longer clutch life, with every diaphragm undergoing ACT's four-stage heat-treating process and precision cover stampings for rigidity and consistency. The Performance Street disc uses premium organic friction material with high copper content for improved heat transfer and a steel-backed lining for greater burst strength and durability, with reduced marcel for faster shift action alongside the Heavy Duty pressure plate.
WarrantyInstallation Instructions
Specifications:
- Pressure Plate: ACT Heavy Duty, four-stage heat-treated diaphragm
- Disc: Performance Street, organic friction material, high copper content
- Disc Backing: Steel-backed lining, reduced marcel for faster shift action
- Includes: Pressure plate, street disc, alignment tool (pilot bearing and release bearing included on some applications)
- Recommended Use: Street and performance driving
- Part Number: ZM1-HDSS
Vehicle Applications:
- 1990 Mazda Miata Base
- 1991 Mazda Miata Base
- 1991 Mazda Miata SE
- 1992 Mazda Miata Base
- 1993 Mazda Miata Base
- 1993 Mazda Miata LE
Warning: This product can expose you to chemicals including carbon black, glass wool fibers, or silica (in clutch discs), chromium and nickel, which are known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov
FAQ
Is this kit comfortable for daily street driving?
Yes. The Performance Street disc uses organic friction material with reduced marcel for smooth, quieter engagement suited to daily street use, paired with the Heavy Duty pressure plate for added clamp load over stock.
What's the benefit of the steel-backed disc lining?
The steel-backed lining increases burst strength and durability compared to a non-backed organic disc, so the disc holds up better under repeated hard use.
Does the kit include a pilot bearing and release bearing?
Pilot bearing and release bearing are included on applications where the vehicle requires them.
Does this kit fit the 1991 Miata SE?
Yes, the ZM1-HDSS covers the 1990-1993 Miata Base along with the 1993 LE and 1991 SE trims.