ACT 17-19 Honda Civic Si HD/Perf Street Sprung Clutch Kit
The 1.5L turbo Civic Si responds so well to a tune that the factory clutch is often the first thing to quit. Owners searching for a fix usually describe the same thing: the revs flare in third or fourth when boost peaks, or the car shudders pulling away after a few hard launches. The ACT HC10-HDSS is a Heavy Duty pressure plate and organic street disc kit for the 2017-2019 Honda Civic Si, built to hold tuned torque while keeping a daily-driver pedal.
The tenth-generation Civic Si was sold only with a six-speed manual. Its L15B7 turbo four makes 205 hp and 192 lb-ft from 2,100 rpm, and a simple tune raises that torque well beyond what Honda sized the clutch for. ACT rates HC10-HDSS at 363 ft-lb at the crank, 63 percent over the factory clutch, which leaves plenty of room for intake, intercooler, downpipe and tune combinations.
The kit uses ACT's H032 Heavy Duty pressure plate for more clamp load and the 3001801 Performance Street sprung disc, a 240 mm organic disc on the Civic's 24-spline input. ACT describes the feel as light to moderate pedal effort with smooth engagement and OE to mild gear rattle. The factory dual-mass flywheel does not go back in: this is a conversion kit with the 601190 XACT Streetlite single-mass flywheel included, and ACT says it must be used with that flywheel. Expect a little more gear rattle at idle than stock; that is the normal trade for a single-mass setup, explained in our dual-mass vs single-mass flywheel guide.
Make a moderate-speed pull in fourth from about 2,500 rpm. If the tach climbs while the car does not accelerate with it, the clutch is slipping. Grinding going into gear is a different problem; it can be the clutch not fully releasing or worn synchros, and our Civic Si third-gear grinding guide helps tell them apart. For how slip feels compared with other drivetrain complaints, read shift flare vs slip.
This listing is for the 2017-2019 Honda Civic Si with the 1.5L turbo and six-speed manual. ACT's own application chart is wider: it lists the same kit for 2017-2021 Civic 1.5L turbo manuals, 2018-2020 Accord 1.5L turbo manuals, 2022-2026 Civic Si, 2022-2024 Civic Sport and Sport Touring manuals, and the 2023-2026 Acura Integra 1.5L turbo. It does not fit the 2.0L Civic Type R. If your car is outside the listed years or has had any swap, send the year and VIN so we can confirm. To compare all options for this platform, see the HC10-HDG6 race kit and the rest of our rebuild kits.
| Brand | ACT |
| Part number | HC10-HDSS |
| Fits | ACT 17-19 Honda Civic Si HD/Perf Street Sprung Clutch Kit |
| Vehicle fitment | Honda Civic Si Hd/Perf (2017-2019) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
The listing covers the 2017-2019 Civic Si. ACT also lists HC10-HDSS for 2017-2021 Civic 1.5L turbo manuals, 2018-2020 Accord 1.5L turbo manuals, 2022-2026 Civic Si and the 2023-2026 Integra 1.5L turbo. It does not fit the Civic Type R.
No. This is a conversion kit. ACT includes its 601190 Streetlite single-mass flywheel and says the kit must be used with it.
ACT rates it at 363 ft-lb of torque at the crank, 63 percent over the factory clutch.
Some added gear rattle at idle is normal when going from a dual-mass to a single-mass flywheel. ACT describes the kit as OE to mild gear rattle with light to moderate pedal effort.
Use Honda manual transmission fluid. Bleed the clutch hydraulic system with fresh brake fluid of the type marked on the reservoir.
