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  See more parts for Mazda RX-8
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ACT HD/Perf Street Sprung Kit Mazda RX-8 2004-2011 - ZM8-HDSS

If you're looking to upgrade your clutch setup, the Advanced Clutch HD/Perf Street Sprung Kit ZM8-HDSS is definitely worth considering. This kit combines ACT's most popular heavy-duty pressure plate with their go-to street disc, and let me tell you, it’s a game-changer. The heavy-duty pressure plate features a unique diaphragm design that ramps up the clamp load while keeping deflection to a minimum. This means your clutch will not only last longer but also perform better under stress. And those four stages of heat treatment? They’re not just for show; they really boost performance.

The pressure plate’s precision cover stampings are all about delivering rigidity and consistency, which is crucial when you’re pushing your car to its limits. Now, let’s talk about the performance street disc. It’s made with premium organic materials that have a high copper content—this helps with heat transfer, so you won’t be worrying about fade when you’re really putting the pedal to the metal. Plus, the steel-backed lining gives it that extra burst strength and durability you want in a clutch. The reduced marcel means quicker shifts, which is a nice touch, especially if you’re into spirited driving.

Installation is straightforward too. If you need a hand, you can find the instructions here. Just a heads up, this kit is designed for light to moderate pedal effort, so you’ll get that smooth, positive engagement without feeling like you’re wrestling with your car. It’s suitable for both street and race use, which is a huge plus if you’re planning on hitting the track.

Here’s a quick rundown of what you can expect:

  • Longer friction life thanks to that exclusive diaphragm design.
  • Carefully engineered for heat tolerance and reduced fade.
  • 100% clamp load tested and dynamically balanced for reliability at high RPMs.

Specifications:

  • Clutch Disc Diameter: 9.4 in (240 mm)
  • Input Spline Quantity: 23
  • Input Shaft Diameter: 1 in
  • Torque Capacity: 330 ft/lbs (0.34 over OE)
  • Product Weight: 15.6 lbs

Just a little note: if you’re using this with a flywheel, make sure you grab the counterweight too—it’s sold separately or as part of a flywheel kit. And remember, you’ll need to use the ACT counterweight with the ACT flywheel for optimal performance.

This kit fits the Mazda RX-8 from 2004 to 2011, so if you’re looking to take your ride to the next level, this might just be the clutch upgrade you’ve been waiting for.

Other Part Numbers:
ACT #actZM8-HDSS

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Vehicle
2004-2011
 Mazda RX-8

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ACT ? Advanced Clutch Technology | Clutch Kits & Flywheels Built to Handle Real Power

If you've added boost, tuned for more power, or simply want better throttle control, then your stock clutch won't cut it. That?s where ACT (Advanced Clutch Technology) comes in delivering high-performance clutch kits and flywheels designed for real drivers who push their builds on the street, strip, or track.

ACT?s lineup includes everything from daily driver friendly HD kits to hardcore twin disc setups for serious horsepower. Whether you?re launching hard in a WRX, drifting in a 370Z, or canyon carving in an M3, ACT gives you the torque capacity and engagement you need without sacrificing drivability.

Why ACT? Because Power Without Control Is Useless.
  • Hold More Power Engineered to handle turbo, supercharger, and high-compression builds
  • Faster Engagement Stronger pressure plates for better bite off the line
  • Better Pedal Feel Balanced response without going full race-car stiff
  • Reduced Rotational Mass Lightweight flywheels improve rev-matching and response
  • No Guesswork Direct-fit applications, no fabbing, no hassle
ACT Clutch Kits and Flywheels Fit the Cars Enthusiasts Build

ACT doesn?t just make universal performance parts ? they build complete, vehicle-specific clutch solutions for enthusiast favorites. Whether you daily a Civic Type R, track a Subaru STI, drift a 240SX, or drag a Mustang GT, ACT offers the right clutch to match your build goals.

Top supported platforms include the Nissan 350Z/370Z, Toyota Supra A90, Chevy Camaro SS/ZL1, Mitsubishi Evo, Ford Focus RS/ST, and BMW M3/M4 ? each with clutch options tuned to your driving needs.

What ACT Offers:
  • Performance Clutch Kits From HD street kits to twin-disc race systems
  • Clutch Discs 6-puck, full-face, rigid or sprung to match your style
  • Pressure Plates Heavy-duty options that increase clamp load without sacrificing control
  • Chromoly Lightweight Flywheels Quicker revs, smoother shifts, and less drivetrain stress
  • Complete Hardware Kits Everything you need for a proper install
Performance Tested. Driver Approved.

ACT isn?t hype ? it?s proven. Their clutches are SFI-certified, track-tested, and used by racers in drag, time attack, autocross, drift, and rally. But what really matters? They hold power, last longer, and feel right even after hundreds of hard launches or hours of canyon carving.

Whether you're upgrading for more power or replacing a tired OEM clutch, ACT gives you the bite, strength, and feel to drive harder with confidence. No compromises, no excuses just parts that work when it matters.

ACT warrants all products to be free of defects in materials and workmanship for normal use and service for a period of one (1) year from retail purchase. Written notice must be immediately given to ACT within the warranty period. We require a copy of the purchase receipt showing the unit was purchased from an Authorized Dealer or Advanced Clutch Technology directly to verify the product is under warranty. Products purchased used do not carry a warranty. This warranty is to the original purchaser and is non-transferable. All non-warranty items are subject to a $50 inspection bench test fee.

ACT reserves the right to examine any part returned for warranty claim to determine, to ACT's satisfaction, whether the material or workmanship of the part does not conform to this limited warranty. ACT's obligation under this warranty shall be limited to repairing, replacing, or crediting, at its option, any part which is deemed covered by ACT. No labor, lift or storage charges will be reimbursed for any reason. Damage to ACT's parts resulting from misuse, improper use, or abuse shall void this limited warranty. Failure to follow ACT's installation instructions and the vehicle manufacturers installation procedures and specifications shall void this limited warranty.

ACT undertakes no responsibility for the quality of the goods except as otherwise provided in this contract. ACT assumes no responsibility that the goods will be fit for any particular purpose for which you may be buying these goods, except as otherwise provided in the contract. ACT shall not be liable for any damage or injury to persons or property resulting from improper installation or misuse of any part subject to this warranty.

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