ACT 1989 Nissan 240SX HD/Perf Street Sprung Clutch Kit
The ACT NX1-HDSS is the street-friendly upgrade clutch for the Nissan 240SX five-speed, built for the 1989-1990 cars with the single-cam KA24E and the 1995-1998 S14 cars with the twin-cam KA24DE. It is the kit most owners pick when a 240SX with bolt-ons or a used clutch has started slipping and the car still needs to be pleasant in traffic. It pairs ACT's Heavy Duty pressure plate with a full-face organic Performance Street disc on a sprung hub, so engagement stays progressive rather than grabby.
The 240SX uses a 224 mm (8.8 in) single-plate clutch on a 1 inch input shaft, released through a hydraulic master and slave cylinder. The NX1-HDSS keeps those dimensions but raises clamp load with ACT's Heavy Duty diaphragm, which resists the deflection that lets a worn factory clutch slip near redline. The organic disc carries a high-copper lining on a steel backing for heat transfer and burst strength, and its sprung center softens takeoffs and drivetrain shock. ACT rates the kit at 275 ft-lb at the crank, 54 percent over the factory clutch, with light to moderate pedal effort, smooth positive engagement and OE to mild gear rattle. The kit weighs 14.6 lb.
That is plenty for a naturally aspirated KA24 with intake, exhaust and cam work, and it leaves margin for a worn engine mount or sticky tires. If you are adding a turbo, look at the stronger NX1-XTSS Xtreme street kit, or the NX1-HDG6 six-pad kit for drift days and hard launches.
Run a road test in third gear from about 2,500 rpm at full throttle; if the tach races ahead of the speedometer, the disc is slipping. Because the 240SX clutch is hydraulic, check the reservoir level and fluid color, look for leaks at the master and slave, and make sure the pedal returns fully before condemning the clutch. Our hard-to-shift clutch guide covers hydraulic faults, and the slipping diagnosis guide explains the road test. To tell a true slip from a momentary flare, see shift flare vs slip.
Our listing is for the 1989 Nissan 240SX, and ACT's application list for NX1-HDSS covers the 1989-1990 240SX KA24E and the 1995-1998 240SX KA24DE. The same kit is listed for the 1974-1983 280Z and 280ZX (L28E), the 1990 Axxess 2WD, the 1981-1984 Maxima 2.4L and 2.8L diesel, the 620 pickup from late 1974 through 1979, and 720 pickups from 1980 to 1986. ACT does not list the 1991-1994 240SX for this kit; those cars use the NX4 series, such as the NX4-XTSS. SR20DET and other engine swaps need a different clutch. If your car has a swapped engine or gearbox, send us the year, VIN and what is fitted and we will confirm. More clutch parts are in our rebuild kits collection.
| Brand | ACT |
| Part number | NX1-HDSS |
| Fits | ACT 1989 Nissan 240SX HD/Perf Street Sprung Clutch Kit |
| Vehicle fitment | Nissan 240Sx Hd/Perf (1989) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. ACT does not list the 1991-1994 240SX for the NX1 kits. Those years use ACT's NX4 series clutch kits.
Yes. ACT lists the 1995-1998 240SX with the KA24DE, in base, SE and LE trims, along with the 1989-1990 KA24E cars.
ACT rates it at 275 ft-lb measured at the crank, 54 percent above the factory clutch. For a turbo KA24 or regular drift use, step up to the Xtreme or six-pad kits.
ACT says its Heavy Duty plates usually raise pedal effort by 15 to 40 percent depending on the car, and rates this kit as light to moderate effort. A healthy master and slave cylinder keeps it comfortable.
The clutch hydraulics take brake fluid; use the type marked on the clutch master cylinder reservoir cap or in your owner's manual. Bleed the slave after the install, and refill the five-speed with the gear oil grade Nissan specifies.
