Description
BC Racing ZR coilover kit BMW M3 E46 Convertible (00-06) 6/9 kg/mm
The BC Racing ZR coilover kit E46 M3 Convertible (part number I-121-ZR) is a coilover kit adjustable in height and damping, also simply called a coilover, for the BMW E46 M3 Convertible, model years 2000 to 2006. The spring rate is 6 kg/mm front and 9 kg/mm rear.
The ZR is the series that BC Racing develops for competitive motorsport, with 3-way adjustment and an external reservoir per damper.
You can mount the reservoir on the chassis or on the damper body, and it is connected to the damper via braided steel lines. MacPherson struts get an inverted monotube, double wishbones an upright monotube, each with a dual piston. The damping is digressive and filled with synthetic oil.
You adjust 20 clicks of low-speed compression, 12 clicks of high-speed compression and 30 clicks of rebound. The spring rate is 6/9 kg/mm and you set the ride height fully independently of the spring preload.
Key benefits
- 3-way adjustment: 20 + 12 + 30 clicks for compression and rebound.
- Reservoir on chassis or damper body: positioning of your choice.
- Braided steel lines: between damper and reservoir.
- Dual piston: a wide adjustment range.
- Inverted monotube on MacPherson: stiff under high loads.
- Ride height fully independent of spring preload: drive low with full stroke.
- Synthetic oil: consistent behaviour over an entire session.
- Spring rate 6/9 kg/mm: as BC Racing supplies it for the M3 Convertible.
- Rebuildable: suitable for intensive use.
Suitable for
BMW M3 E46 Convertible, model years 2000 to 2006
- Competitive motorsport
- Track use with a setup for each circuit
- Drivers who want a 3-way BC Racing kit with external reservoir
Technical specifications
- Manufacturer: BC Racing
- Part number: I-121-ZR
- Series: ZR, 3-way competition series with external reservoir
- Spring rate front/rear: 6/9 kg/mm
- Damper design: inverted monotube on MacPherson, upright monotube on double wishbones, dual piston, digressive, synthetic oil
- Damping: 3-way, 20 clicks low-speed compression, 12 clicks high-speed compression, 30 clicks rebound
- Ride height: fully adjustable, independent of the spring preload
- Top mounts: camber plates on suitable kits, rubber top mounts optional
- 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 from track-focused series is not covered by the warranty
Fitting and delivery
Before fitting, choose whether to place the reservoirs on the chassis or on the damper body, and route the lines so that they stay clear during suspension travel and steering. After setting the ride height, a wheel alignment is required. BC Racing advises periodic greasing of the ZR 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. No stock at the manufacturer? You can still order, and we will let you know when it arrives.
For anyone using an M3 Convertible in competition, the ZR is the 3-way competition kit from BC Racing, with a reservoir on the chassis or damper body.
Why choose this ZR coilover kit E46 M3 Convertible?
Because the ZR gives you control in every area: three damping adjustments, a freely positionable reservoir and a ride height that is fully independent of the springs. For an open-top M3 being built up as a competition car, it lets you adjust low-speed and high-speed compression and rebound each separately.
BC Racing coilover kits for the BMW E46 M3 Convertible
Overview of the BC Racing series for the BMW E46 M3 Convertible 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 | I-121-BR-RA | 6/9 | 30 clicks, linear | Road with the occasional track day |
| DS | I-121-DS-DA | 6/9 | 30 clicks, digressive | Track-focused, sporty road use |
| RM | I-121-RM-MA | 6/9 | 30 clicks, digressive, synthetic oil | Track days, hill climbs, tarmac rally |
| ER | I-121-ER | 6/9 | 2-way, 30 clicks per direction, external reservoir | Serious track and competition use |
| HM | I-121-HM | 6/9 | 2-way, 30 clicks per direction, external reservoir | Serious track use |
| ZX | I-121-ZX | 6/9 | 3-way (20/12/30 clicks), external reservoir | Competition, long sessions, drift |
| ZR (this kit) | I-121-ZR | 6/9 | 3-way (20/12/30 clicks), external reservoir | Competitive motorsport |
Frequently asked questions
What is the difference between the BC Racing ZR and HM for the E46 M3 Convertible?
The ZR coilover kit E46 M3 Convertible is 3-way and splits the compression into low and high speed; the HM is 2-way with separate compression and rebound. In addition, you can place the ZR reservoir on the chassis or on the damper body.
Is the BC Racing ZR for the E46 M3 Convertible suitable as a road kit?
No, the ZR is intended for competitive motorsport. If you mainly drive the M3 Convertible on the road, look at the BR series, the all-rounder for the road with the occasional track day.
What is the delivery time of this BC Racing ZR coilover kit?
The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If there is no stock, you can still order and we will keep you informed.
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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