Spec Nissan RB25/20 Stage 2+ Clutch Kit
The SPEC SN233H Stage 2+ is the middle step in SPEC's push-type Nissan clutch range, aimed at RB20DET and RB25DET owners whose Stage 2 has started to slip after a boost increase but who still drive the car on the street every day. SPEC rates it at 494 ft-lb of torque capacity, and it fits the R32 GTS-t and R33 GTS Skyline gearboxes along with S13, S14 and S15 SR20DET cars and several 300ZX models. If you are hunting for a clutch that holds a mild turbo upgrade without the grabby feel of a puck disc, this is the part number.
Push-type RB gearboxes use a conventional release bearing that pushes on the pressure plate fingers, fed by a clutch master and slave cylinder. The clutch has to clamp hard enough to carry turbo torque through the disc without making the pedal heavy or the engagement abrupt. SPEC describes its Stage 2+ as a multi-friction disc that keeps the drivability of its Stage 2 Kevlar disc while adding 15 to 20 percent more torque capacity.
On this application the numbers line up that way. The SN232 Stage 2 is rated 439 ft-lb, SN233H sits at 494, and the SN233 Stage 3 moves to a six-puck carbon semi-metallic disc at 525 ft-lb. Choose SN233H when you want more margin than Stage 2 but do not want a puck clutch in traffic. SPEC lists the kit at 19 lb.
Bleed the hydraulics first. A weeping slave or old fluid can stop the clutch from releasing fully, which feels like a clutch fault but is not. Then do a load test: in a high gear at low rpm, go to full throttle and watch the tach as boost builds. If engine speed climbs faster than the car accelerates, the disc is slipping; our slipping diagnosis guide explains the test. Look for oil on the bellhousing seam too, because a leaking rear main seal will ruin any new disc. The clutch chatter guide covers takeoff shudder, and our clutch kit buyer's guide helps match stage to power level.
SPEC lists SN233H for the Skyline R32 GTS-t and GTR push type (1989-1994), Skyline R33 GTS push type (1993-1998) and Skyline R31 2.0L (1985-1989). The same kit is listed for the S13 200SX SR20DET (1989-1994), S14 Silvia SR20DET (1994-1998), S15 SR20DET six-speed with a single-mass flywheel (1999-2002), several 300ZX years, and Nissan 2.4L trucks. Pull-type gearboxes, such as later RB25 Neo units, are a different design and need a different kit, so check your release fork and bearing before ordering. RB-swapped chassis vary by gearbox, so match the transmission, not the body. If in doubt, send us your chassis code, engine and gearbox.
SN233H is new, in stock, ships from the USA the same business day, and has a 1-year warranty.
| Brand | SPEC |
| Part number | SN233H |
| Fits | Spec Nissan RB25/20 Stage 2+ Clutch Kit |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
SPEC lists SN233H for push-type R32 and R33 gearboxes. Pull-type setups use a different pressure plate and release system, so check which type your car has before ordering.
SPEC rates SN233H at 494 ft-lb, between the SN232 Stage 2 at 439 and the SN233 Stage 3 at 525.
Yes. SPEC describes the Stage 2+ multi-friction disc as keeping the drivability of its Stage 2 with 15 to 20 percent more holding capacity, so it suits daily driving.
Not always. A healthy stock flywheel can be resurfaced. If it has cracks or deep heat spots, replace it, and match the flywheel to your engine and gearbox.
These Nissans use brake fluid in the clutch master and slave. Flush and bleed with fresh fluid of the type listed on the reservoir cap during the install.
