ACT 1991 Nissan 240SX HD/Race Sprung 6 Pad Clutch Kit
ACT NX4-HDG6 is built for the S13 Nissan 240SX with the twin-cam KA24DE, model years 1991 through 1994, when the car is used hard enough that an organic disc keeps overheating. Drift days, repeated clutch kicks and a boosted KA are the usual reasons people land here. It uses ACT's Heavy Duty pressure plate, so the pedal stays reasonable, and a six-pad ceramic race disc that shrugs off the heat a full-face street disc cannot.
The N023 Heavy Duty plate uses ACT's own diaphragm design to raise clamp load over the factory plate, and it is paired here with the 6224206 six-pad spring-centered race disc. ACT's specifications for the kit:
The sprung center damps torsional vibration from the engine, which is easier on the gearbox than a rigid hub, but ACT is clear that engagement with a six-pad disc is harsher while shifts are faster. In practice there is little room to slip it gently in traffic. If you want the same car to be friendlier day to day, the NX4-XTSS keeps an organic street disc behind a stronger Xtreme plate.
On an S13, rule out the hydraulics first. Check the clutch master and slave for leaks and bleed the system; a spongy pedal can keep the clutch from fully releasing and mimic a worn unit. Then road-test: fourth gear around 2,000 rpm, floor it, and watch whether rpm climbs ahead of speed. Our slipping diagnosis guide walks through the test, and shift flare vs slip helps describe what you feel.
ACT lists NX4-HDG6 for the 1991-1994 240SX Base, LE and SE with the 2.4L KA24DE. Our title shows 1991, the first year of that range. The 1989-1990 cars use the single-cam KA24E and take the NX1 kits instead, such as the NX1-HDG6. SR20DET swaps and later S14 drivetrains are different again. If the engine or transmission has been changed, compare the old disc diameter and spline or send us your year and VIN before ordering. See more kits on our rebuild kits page.
| Brand | ACT |
| Part number | NX4-HDG6 |
| Fits | ACT 1991 Nissan 240SX HD/Race Sprung 6 Pad Clutch Kit |
| Vehicle fitment | Nissan 240Sx Hd/Race Sprung 6 (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 KA24E cars use NX1 kits.
ACT rates it at 350 ft-lb at the crank, 97 percent over the factory clutch.
NX4-HDG6 uses the Heavy Duty plate with a six-pad ceramic disc: lighter pedal, harsher engagement, more heat tolerance. NX4-XTSS uses the Xtreme plate with an organic disc: heavier pedal, smoother takeoff, 370 ft-lb.
No. Resurface the stock flywheel or buy one separately; ACT offers the XACT Prolite 600360 and Streetlite 600365 for this car.
ACT lists light to moderate effort. Its FAQ puts Heavy Duty plates at roughly 15 to 40 percent more effort than stock depending on the car.
