ZM2-HDR4 - HD/Race Rigid 4 Pad ZM2-HDR4 - HD/Race Rigid 4 Pad

$623.00
$486.00

GUARANTEED
TO FIT YOUR CAR

SHIPS OUT
SAME DAY

100% CUSTOMER
SATISFACTION

GUARANTEED
TO FIT YOUR CAR

SHIPS OUT
SAME DAY

100% CUSTOMER
SATISFACTION

Availability: Many In Stock
Sku: ZM2-HDR4
ACT

Specifications: ZM2-HDR4 Clutch Kit for Mazda Miata

Item Description: HD/Race Rigid 4 Pad Clutch Kit

Product Weight (lbs.): 11

Torque Capacity (ft/lbs.): 310

Torque Capacity Over OE: 74%

Disc Material: Ceramic

Clutch Disc Diameter (Inches): 8.8

Clutch Disc Diameter (Millimeters): 224

Input Shaft Diameter (inches): 0.9375

Pressure Plate Type: Heavy Duty

Warranty: 12 Months (view details)

Description: The ZM2-HDR4 kit features ACT's esteemed Heavy Duty pressure plate, leveraging an exclusive diaphragm design to enhance clamp load, diminish deflection, and optimize clutch lifespan. Each diaphragm undergoes a rigorous four-stage heat-treating process, ensuring unparalleled performance. Precision cover stampings deliver rigidity and consistency. ACT's 4-pad rigid race discs are meticulously crafted with premium ceramic friction materials. The chrome-moly hub is heat-treated for enhanced strength and durability. The lightweight, rigid design facilitates swift shifts and seamless operation. While engagement with the 4-pad rigid race disc may be more aggressive, shifting becomes notably faster. This disc is particularly well-suited for smaller disc sizes in smaller engines.

Description:

  • Feel: Light to moderate pedal effort, aggressive engagement, increased gear rattle
  • Life: Moderate friction life, extended by ACT's exclusive diaphragm design; rigid design may increase spline wear
  • Quality: Carefully engineered, precisely assembled, accurately balanced; utilizes select ceramic friction materials for high heat tolerance and maximum performance
  • Recommended Use: Designed for race use only
  • ACT Difference: Rigorously clamp load tested and dynamically computer balanced for smooth high RPM reliability

Vehicle Fitment: The ZM2-HDR4 Clutch Kit is specifically engineered for the following Mazda Miata models:

  • 1990-1997: Base, SE, LE
  • 1994-2005: M Edition
  • 1997-2003: STO, Shinsen
  • 1999-2000: 10th Anniversary, LS, SE
  • 2001-2005: LS, Mazdaspeed

Specifications: ZM2-HDR4 Clutch Kit for Mazda Miata

Item Description: HD/Race Rigid 4 Pad Clutch Kit

Product Weight (lbs.): 11

Torque Capacity (ft/lbs.): 310

Torque Capacity Over OE: 74%

Disc Material: Ceramic

Clutch Disc Diameter (Inches): 8.8

Clutch Disc Diameter (Millimeters): 224

Input Shaft Diameter (inches): 0.9375

Pressure Plate Type: Heavy Duty

Warranty: 12 Months (view details)

Description: The ZM2-HDR4 kit features ACT's esteemed Heavy Duty pressure plate, leveraging an exclusive diaphragm design to enhance clamp load, diminish deflection, and optimize clutch lifespan. Each diaphragm undergoes a rigorous four-stage heat-treating process, ensuring unparalleled performance. Precision cover stampings deliver rigidity and consistency. ACT's 4-pad rigid race discs are meticulously crafted with premium ceramic friction materials. The chrome-moly hub is heat-treated for enhanced strength and durability. The lightweight, rigid design facilitates swift shifts and seamless operation. While engagement with the 4-pad rigid race disc may be more aggressive, shifting becomes notably faster. This disc is particularly well-suited for smaller disc sizes in smaller engines.

Description:

  • Feel: Light to moderate pedal effort, aggressive engagement, increased gear rattle
  • Life: Moderate friction life, extended by ACT's exclusive diaphragm design; rigid design may increase spline wear
  • Quality: Carefully engineered, precisely assembled, accurately balanced; utilizes select ceramic friction materials for high heat tolerance and maximum performance
  • Recommended Use: Designed for race use only
  • ACT Difference: Rigorously clamp load tested and dynamically computer balanced for smooth high RPM reliability

Vehicle Fitment: The ZM2-HDR4 Clutch Kit is specifically engineered for the following Mazda Miata models:

  • 1990-1997: Base, SE, LE
  • 1994-2005: M Edition
  • 1997-2003: STO, Shinsen
  • 1999-2000: 10th Anniversary, LS, SE
  • 2001-2005: LS, Mazdaspeed

Frequently Asked Questions

Are ACT clutches balanced?

Yes! All ACT clutch assemblies are computer spin balanced to within .25 oz-in to guarantee help smooth operation across the entire RPM range. For comparison, stock production clutches are typically balanced to within .50 oz-in. Lower is definitely better!

Will an ACT clutch increase pedal effort?

ACT pressure plates are specifically designed to handle high torque applications. With ACT's durable design, expect an increase in pedal effort between 15-40% (Heavy Duty) and 50-80% (Xtreme), depending on the application. Clutches developed with less pedal effort often result in a lack of longevity, torque capacity and/or engagement quality.

Do ACT clutches require a break-in period?

For organic street discs, we recommend breaking in the clutch for 300-500 miles with mild engagement, such as stop-and-go city driving prior to racing or spirited driving. ACT race discs usually only require a few hard slips to lap in the surfaces prior to normal driving or racing. Do not overheat the clutch during the break-in period, as this can result in friction surfaces fusing together, hot spots, and friction surface glazing.

Are ACT clutches repairable or rebuildable?

In some situations, rebuilds or repairs may be possible (see warranty), after inspection of the clutch assembly. Please contact our technical department for further information. Because of special modifications, we do not recommend servicing by a general clutch rebuilder.

How much does an ACT clutch weigh?

The weight of the ACT clutch assembly will usually be the same as a stock OEM clutch assembly.

Frequently Asked Questions

Are ACT clutches balanced?

Yes! All ACT clutch assemblies are computer spin balanced to within .25 oz-in to guarantee help smooth operation across the entire RPM range. For comparison, stock production clutches are typically balanced to within .50 oz-in. Lower is definitely better!

Will an ACT clutch increase pedal effort?

ACT pressure plates are specifically designed to handle high torque applications. With ACT's durable design, expect an increase in pedal effort between 15-40% (Heavy Duty) and 50-80% (Xtreme), depending on the application. Clutches developed with less pedal effort often result in a lack of longevity, torque capacity and/or engagement quality.

Do ACT clutches require a break-in period?

For organic street discs, we recommend breaking in the clutch for 300-500 miles with mild engagement, such as stop-and-go city driving prior to racing or spirited driving. ACT race discs usually only require a few hard slips to lap in the surfaces prior to normal driving or racing. Do not overheat the clutch during the break-in period, as this can result in friction surfaces fusing together, hot spots, and friction surface glazing.

Are ACT clutches repairable or rebuildable?

In some situations, rebuilds or repairs may be possible (see warranty), after inspection of the clutch assembly. Please contact our technical department for further information. Because of special modifications, we do not recommend servicing by a general clutch rebuilder.

How much does an ACT clutch weigh?

The weight of the ACT clutch assembly will usually be the same as a stock OEM clutch assembly.

Free Shipping for the Contiguous Continental States excluding Alaska.

We use UPS, FedEx, and USPS for deliveries. We are not responsible for any shipping problems and shall not be held liable for any "reasonable" delay beyond our advertised delivery time-frames. Shipment by Ground Courier can take up to 6 business days for delivery or Express Courier which can take up to 3 business days for delivery. Shipping time frames are once the order has been processed. Due to high demand, order processing can take 1 to 2 business days.

The on-time delivery guarantee does not apply to shipments that are delayed due to causes beyond the couriers control, including, but not limited to, the following: the unavailability or refusal of a person to accept delivery of the shipment, delays caused by the consignee, acts of God, public authorities acting with actual or apparent authority on the premises, acts or omissions of Customs or similar authorities, riots, circumstances arising before, during, or after a strike or other labor disputes, civil commotions, disruptions in the air or ground transportation network (such as weather phenomena), and natural disasters. For more information on the shipping Limits and Restrictions visit the UPS website at http://www.ups.com.

We do not accept Collect shipments for on-line orders. All shipping charges are charged at the time the order is placed on-line.

Any order received after 3PM PST will not ship until the following business day.

Free Shipping for the Contiguous Continental States excluding Alaska.

We use UPS, FedEx, and USPS for deliveries. We are not responsible for any shipping problems and shall not be held liable for any "reasonable" delay beyond our advertised delivery time-frames. Shipment by Ground Courier can take up to 6 business days for delivery or Express Courier which can take up to 3 business days for delivery. Shipping time frames are once the order has been processed. Due to high demand, order processing can take 1 to 2 business days.

The on-time delivery guarantee does not apply to shipments that are delayed due to causes beyond the couriers control, including, but not limited to, the following: the unavailability or refusal of a person to accept delivery of the shipment, delays caused by the consignee, acts of God, public authorities acting with actual or apparent authority on the premises, acts or omissions of Customs or similar authorities, riots, circumstances arising before, during, or after a strike or other labor disputes, civil commotions, disruptions in the air or ground transportation network (such as weather phenomena), and natural disasters. For more information on the shipping Limits and Restrictions visit the UPS website at http://www.ups.com.

We do not accept Collect shipments for on-line orders. All shipping charges are charged at the time the order is placed on-line.

Any order received after 3PM PST will not ship until the following business day.

PROP 65 WARNING: This product can expose you to chemicals including carbon black, glass wool fibers, and 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.

PROP 65 WARNING: This product can expose you to chemicals including carbon black, glass wool fibers, and 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.

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