ACT 1991 Nissan 240SX XT/Perf Street Sprung Clutch Kit
The ACT NX4-XTSS is a high-clamp street clutch for the S13 Nissan 240SX with the twin-cam KA24DE, the 1991 through 1994 cars. Buyers usually come to it with a turbocharged or heavily modified KA that is slipping the stock or Stage 1 clutch, or a drift car that needs more holding power but still has to idle through traffic. It keeps an organic sprung disc for street manners and pairs it with ACT's strongest single-disc pressure plate.
ACT's Xtreme N023X pressure plate uses a heavier diaphragm than the Heavy Duty plate, so it clamps the disc much harder against the flywheel. The disc is ACT's Performance Street sprung organic unit, with copper-rich, steel-backed facing and torsion springs in the hub, so takeoff stays smooth and gear rattle stays close to stock. ACT's published numbers:
Included: N023X pressure plate, 3000407 sprung disc, RB810 release bearing, PB1012 pilot bushing and AT01 alignment tool.
Bleed the clutch and check the master and slave cylinders for leaks first; a soft pedal on these cars is often the hydraulics. Then do a slip check: fourth gear, low rpm, full throttle, and watch whether the tach rises without road speed following. Our transmission slipping diagnosis guide explains the test, and manual vs. automatic repair cost gives a sense of the labor involved.
ACT lists the NX4-XTSS for 1991 to 1994 240SX Base, LE and SE with the 2389 cc KA24DE DOHC engine. Our title shows 1991 because that is the first year. The 1989-1990 cars with the single-cam KA24E use a different kit, the ACT NX1-XTSS. Swapped cars, SR20DET conversions and 1995-up S14 drivetrains may differ, so compare your old disc diameter and spline count or send us your year and VIN. Browse more kits in our rebuild kits section.
| Brand | ACT |
| Part number | NX4-XTSS |
| Fits | ACT 1991 Nissan 240SX XT/Perf Street Sprung Clutch Kit |
| Vehicle fitment | Nissan 240Sx Xt/Perf (1991) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. ACT lists it for 1991-1994 cars with the KA24DE. The 1989-1990 single-cam KA24E cars use the NX1 kits.
ACT rates it moderate to heavy. Its Xtreme plates typically raise pedal effort by 50 to 80 percent over stock depending on the car.
ACT rates it at 370 ft-lb at the crank, 109 percent over the factory clutch, which covers most street turbo KA builds.
The kit does not include one. Resurface the stock flywheel if it is in spec, or fit a new one such as ACT's XACT Streetlite or Prolite.
The clutch shares brake fluid. Use the grade shown on the reservoir cap and bleed the system after install.
