Description
Nissan S13 Silvia 240SX inverted (89-94) BC Racing RM coilover kit 10/8 kg/mm
The BC Racing RM coilover kit S13 (part number D-12-RM-MA) is a coilover kit adjustable in height and damping, also simply called a coilover, for the Nissan Silvia, 180SX, 200SX and 240SX on the S13 platform, model years 1989 to 1994. The spring rate is 10 kg/mm front and 8 kg/mm rear.
The kit is intended for anyone who uses their S13 for track days, hill climbs or tarmac rally. The RM series uses an inverted monotube on MacPherson struts and an upright monotube in the other positions, each with a digressive piston.
An inverted damper is upside down compared to a regular strut. That makes the construction stiffer against the lateral forces that occur in a MacPherson strut, which is exactly what an S13 suffers from when you drive it hard through corners.
The kit has a firm spring rate of 10/8 kg/mm and you adjust the damping in 30 clicks. Camber plates are standard on suitable kits. According to BC Racing, this kit also fits the A31.
Key benefits
- Inverted construction: stiffer under lateral load on MacPherson struts.
- Digressive piston: keeps the body still, lets the wheels move freely.
- Spring rate 10/8 kg/mm: firm, for intensive track use.
- 30-click adjustment: compression and rebound together, easy to adjust for each event.
- Fully synthetic oil: very high viscosity index for consistent performance.
- Camber plate at the front: standard on the RM; rubber or original top mounts remain at the rear.
- Rebuildable: can be rebuilt after a tough season.
Suitable for
Nissan Silvia, 180SX, 200SX and 240SX on the S13 platform, model years 1989 to 1994
- Track days and circuit work
- Hill climbs and tarmac rally
- Drift cars that require a firm spring rate
Technical specifications
- Manufacturer: BC Racing
- Part number: D-12-RM-MA
- Series: RM, inverted, track day and motorsport
- Spring rate front/rear: 10/8 kg/mm
- Damper design: inverted monotube on MacPherson, upright monotube on non-MacPherson, digressive piston
- Damping: 30 clicks, compression and rebound simultaneously
- Ride height: infinitely adjustable via the damper body
- Top mounts: camber plate or pillowball top mount at the front, rubber or original top mount at the rear (code MA)
- Contents: dampers and springs front and rear, lower mounts, top mounts where applicable, adjustment spanners and warranty card with serial number
- Warranty: 1 year on manufacturing defects. Noise is not covered by the warranty
Fitting and delivery
The RM is vehicle-specific and replaces the original struts and dampers all round. First set the ride height, let the car settle for a moment and then have the camber, caster and toe properly aligned. BC Racing advises periodic greasing of the RM series and recommends it less for road use than the BR, DS, ER or ZX. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If the kit is temporarily sold out at the manufacturer, you can still order and we will keep you informed.
An inverted strut does not flex where a regular strut does, and you feel that in every fast corner.
Why choose this RM coilover kit S13?
You get the stiffness of an inverted construction and digressive damping without the complexity of an external reservoir. That makes the RM a strong choice for anyone who often goes on track and wants a kit that is quick to set up and does not easily lose its balance.
BC Racing coilover kits for the Nissan S13
Overview of the BC Racing series for the Nissan S13 supplied by Race4DriftParts, with the BC Racing part number. Spring rates in kg/mm, front/rear.
| Series | Part number | Springs f/r | Damping | Intended for |
|---|---|---|---|---|
| BR | D-12-BR-RA | 6/4 | 30 clicks, linear | Road with the occasional track day |
| DS | D-12-DS-DA | 6/4 | 30 clicks, digressive | Track-focused, sporty road use |
| RM (this kit) | D-12-RM-MA, inverted | 10/8 | 30 clicks, digressive, synthetic oil | Track days, hill climbs, tarmac rally |
| ER | D-12-ER, camber/caster top mounts | 8/6 | 2-way, 30 clicks per direction, external reservoir | Serious track and competition use |
| ZX | D-12-ZX | 6/4 | 3-way (20/12/30 clicks), external reservoir | Competition, long sessions, drift |
| ZR | D-12-ZR | 6/4 | 3-way (20/12/30 clicks), external reservoir | Competitive motorsport |
Frequently asked questions
What is the difference between the BC Racing RM and DS for the Nissan S13?
Both have a digressive piston and 30 clicks, but the RM coilover kit S13 is inverted on MacPherson struts and uses fully synthetic oil. This makes it more focused on intensive track use.
Is the BC Racing RM coilover kit S13 with 10/8 kg/mm too hard for the road?
Yes, for daily use 10/8 kg/mm is firm: the RM is mainly made for track work, hill climbs and rally. If you want more comfort on the road, look at the BR series.
What is the delivery time of this BC Racing RM coilover kit for the Nissan S13?
The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If the kit is temporarily sold out, you can still order it and we will let you know when it is in.
Delivery outside the European Union: different shipping costs may apply. Don’t worry: we will email you as soon as possible after your order and agree the shipping with you. You are not committed to anything without your consent.
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