ACT 2007 Mazda 3 HD/Perf Street Sprung Clutch Kit
Most Mazdaspeed3 owners shopping for a clutch are dealing with one of two things: a factory clutch that has finally worn out, or a stock clutch that started slipping the week the car got a tune and an intake. The ACT ZX5-HDSS is the sensible answer for both. It pairs ACT's Heavy Duty pressure plate with its organic Performance Street disc, so it holds more torque than stock without turning the car into a chore in traffic. The listing title reads "2007 Mazda 3", but this is the turbocharged Mazdaspeed kit: ACT lists it for the 2007-2013 Mazdaspeed3 and the 2006-2007 Mazdaspeed6.
The 2.3L direct-injection turbo engine makes its torque early and hard, and the clutch is the first part of the six-speed drivetrain to feel it. When clamp load is no longer enough, the disc slips under boost and glazes, and it gets worse each time. ZX5-HDSS raises the holding power to 449 ft-lb measured at the crank, which ACT puts at 51 percent over the original clutch. That is a good match for a car with bolt-ons and a conservative tune, and a step below the Xtreme plate ACT sells for more aggressive builds.
The disc is a 240 mm sprung organic unit with a 1 inch input. The sprung hub soaks up driveline shock, and the high-copper organic facing engages progressively, which keeps launches and parking-lot maneuvers predictable. ACT says to expect roughly 15 to 40 percent more pedal effort with a Heavy Duty plate, depending on the car. This is a conversion kit: the XACT Streetlite flywheel comes in the box, and the pressure plate is designed to bolt to it rather than to the factory dual-mass style flywheel.
In fourth gear at low rpm, go to full throttle. If the tach climbs faster than road speed, the disc is slipping and it will not recover. Before you order, rule out the hydraulics: a soft pedal, grinding going into gear or a pedal that sticks low points to fluid, the master or the slave, not the disc. Also look for oil at the bellhousing, because a leaking seal will contaminate a new disc. Our slipping diagnosis guide covers each step, and flare vs slip explains what each one feels like from the seat. For pricing and upgrade levels, see the Mazdaspeed3 clutch upgrade guide.
ACT's application list for ZX5-HDSS is the 2007-2013 Mazda Mazdaspeed3 and the 2006-2007 Mazdaspeed6, both with the 2.3L turbo. It does not fit the non-turbo Mazda3. If the car has had a transmission or engine swap, send the year and VIN and we will confirm before it ships. Building past the 449 ft-lb rating? The ZX5-XTSS Xtreme street kit raises clamp load with the same disc, and the ZX5-HDG6 6-pad race kit is for track and drag use.
| Brand | ACT |
| Part number | ZX5-HDSS |
| Fits | ACT 2007 Mazda 3 HD/Perf Street Sprung Clutch Kit |
| Vehicle fitment | Mazda 3 Hd/Perf (2007) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. ACT lists it only for the turbocharged 2007-2013 Mazdaspeed3 and the 2006-2007 Mazdaspeed6. The non-turbo Mazda3 uses a different clutch and transmission.
Yes. The kit includes ACT's 600641 XACT Streetlite flywheel, and the pressure plate is meant to be used with it, so you do not reuse the factory flywheel.
ACT rates ZX5-HDSS at 449 ft-lb at the crank, 51 percent over the original clutch. For more than that, look at the ZX5-XTSS Xtreme kit.
Somewhat. ACT says a Heavy Duty pressure plate typically adds about 15 to 40 percent pedal effort depending on the vehicle, which most owners find easy to live with on the street.
Yes. ACT recommends 300 to 500 miles of mild engagement, such as normal city driving, before racing or hard launches, and warns against overheating the clutch during that time.
