ACT 2012 Honda Civic HD/Perf Street Sprung Clutch Kit
If your 2012 Honda Civic Si slips in third and fourth when the K24 pulls hard, chatters pulling away from a light, or the pedal engagement point has crept to the top of its travel, the friction disc is near the end. The ACT AR2-HDSS is a Heavy Duty pressure plate and Performance Street sprung organic disc package built for that car, and unlike many kits it ships with a lightweight ACT flywheel in the box, so the whole clutch stack is replaced at once.
The 2012 Civic Si moved to the 2.4-liter K24Z7 with a six-speed manual, and its clutch has to carry noticeably more low-rpm torque than the old K20 cars. ACT rates this kit at 255 ft-lb at the crank, 24 percent over the factory clutch. The H024 pressure plate uses ACT's heavy duty diaphragm to raise clamp load without a race-car pedal, and the 3000108 disc is a 214 mm (8.4 in) sprung-hub organic disc with a high copper content for heat transfer. The sprung hub matters on a daily driver: it soaks up driveline vibration, so gear rattle stays close to stock. The kit is intended for stock to lightly modified street cars; for big boost, ACT's Xtreme versions are the next step.
Do a load test: in fourth gear around 2,500 rpm, go to full throttle and watch the tach. If rpm jumps ahead of road speed, the clutch is slipping. Before you condemn it, make sure the hydraulics are not the cause; a weak slave or air in the line can keep the clutch partly applied or stop it releasing. Our transmission slipping diagnosis guide walks through the load test and the difference between true slip and a drivetrain issue. A grinding shift with a healthy clutch usually means worn synchros, which a clutch kit will not fix.
This listing is for the 2012 Honda Civic Si with the K24Z7. ACT's own application chart for AR2-HDSS also covers 2013 to 2015 Civic Si, 2009 to 2014 Acura TSX (K24Z3), 2003 to 2012 Accord 2.4 and 2013 to 2015 ILX 2.4. ACT notes that this kit must be run with the ACT flywheel, and the 600780 XACT Streetlite flywheel is included. Input shaft spline diameter is 1.03125 in. If your car has had an engine or transmission swap, send us the year and VIN before ordering. More options are in our clutch and rebuild kits collection.
Install the new pilot bushing, bolt the Streetlite flywheel on with clean threads and factory torque, then center the disc with the supplied AT78 tool and tighten the pressure plate bolts gradually in a crisscross pattern. Inspect the fork pivot and grease the input spline lightly. Refill the gearbox with Honda MTF and bleed the clutch hydraulics with the brake fluid marked on the reservoir cap; a tool such as the pneumatic extractor and bleeder speeds this up. Expect 15 to 40 percent more pedal effort than stock and drive gently for 300 to 500 miles so the organic facing beds in. If you plan to add a turbo, compare the AR2-XTSS Xtreme street kit or the competition-only AR2-XTR6.
| Brand | ACT |
| Part number | AR2-HDSS |
| Fits | ACT 2012 Honda Civic HD/Perf Street Sprung Clutch Kit |
| Vehicle fitment | Honda Civic Hd/Perf (2012) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
ACT lists the same kit for the 2012 to 2015 Civic Si with the K24Z7, plus the 2009 to 2014 TSX, 2003 to 2012 Accord 2.4 and 2013 to 2015 ILX 2.4. This listing is titled for the 2012 car; send your year and VIN if you want us to confirm.
No. ACT requires its own flywheel with this kit and includes the 600780 XACT Streetlite flywheel, so the stock flywheel does not go back in.
ACT says its Heavy Duty pressure plates raise pedal effort by roughly 15 to 40 percent depending on the car. Most drivers find it firm but fine for daily use.
ACT rates the AR2-HDSS at 255 ft-lb of torque at the crank, 24 percent over the factory clutch. That suits stock and bolt-on K24 cars; forced induction builds should look at the Xtreme versions.
Yes. ACT recommends 300 to 500 miles of gentle, stop-and-go driving on the organic disc before launches or track use, and warns not to overheat the clutch during break-in.
