Description
BMW E46 M3 Coupe camber/caster top mounts (00-06) BC Racing ER coilover kit 7/10 kg/mm
The BC Racing ER coilover kit E46 M3 (part number I-14-ER) is a coilover kit adjustable in height and damping, also simply called a coilover, for the BMW E46 M3 Coupe, model years 2000 to 2006. The spring rate is 7 kg/mm front and 10 kg/mm rear.
The kit is intended for an M3 that is used seriously on track or in competition. The ER series works with monotube dampers with a double piston and an external reservoir, and you adjust compression and rebound independently of each other, each in 30 clicks.
BC Racing supplies this M3 Coupe version with camber/caster top mounts at the front, which let you adjust camber and caster at the front. The spring rate is 7/10 kg/mm, stiffer than the 6/9 kg/mm of the BR and DS for the same car.
The damping is digressive and the dampers are filled with fully synthetic oil with an ultra-high viscosity index. The ride height is infinitely adjustable via the damper body; a concave lock ring locks the setting in place.
Key benefits
- 2-way adjustment: compression and rebound each separately in 30 clicks.
- External reservoir: extra oil capacity for hard track sessions.
- Double piston: monotube design with two pistons.
- Camber/caster top mounts at the front: standard in this M3 Coupe version.
- Digressive damping: firm on slow body movements.
- Synthetic oil with ultra-high VI: stable at high temperatures.
- Spring rate 7/10 kg/mm: a stiffer setup for track use.
- Concave lock ring: holds the height setting in place.
Suitable for
BMW M3 E46 Coupe, model years 2000 to 2006
- Serious track use and club races
- Track days with long sessions
- Drivers who want to adjust compression and rebound separately
Technical specifications
- Manufacturer: BC Racing
- Part number: I-14-ER
- Series: ER, 2-way with external reservoir
- Spring rate front/rear: 7/10 kg/mm
- Damper design: monotube with double piston and external reservoir, digressive, fully synthetic oil
- Damping: 2-way, 30 clicks compression and 30 clicks rebound, independent of each other
- Ride height: infinitely adjustable via the damper body
- Top mounts: camber/caster top mounts at the front, 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
When fitting, plan where the reservoirs will sit and check that they stay clear at full steering lock and with the suspension fully compressed. After setting the ride height, a wheel alignment is required; with the camber/caster top mounts the alignment technician can set the front wheels correctly straight away. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. No stock? You can still order and we will keep you informed.
Separate compression and rebound plus camber/caster top mounts: with these you set up an M3 Coupe for the track, not for a compromise.
Why choose this ER coilover kit E46 M3?
Because with a 1-way kit you always have to settle on a compromise between compression and rebound. With the ER you adjust the two independently of each other, and the stiffer 7/10 kg/mm springs suit an M3 that is driven mainly on track. Together with the camber/caster top mounts, you have everything in hand for a good track setup.
BC Racing coilover kits for the BMW E46 M3 Coupe
Overview of the BC Racing series for the BMW E46 M3 Coupe 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-14-BR-RA, offset top mounts | 6/9 | 30 clicks, linear | Road with the occasional track day |
| DS | I-14-DS-DA, offset top mounts | 6/9 | 30 clicks, digressive | Track-focused, sporty road use |
| RM | I-14-RM-MA, central top mounts | 6/9 | 30 clicks, digressive, synthetic oil | Track days, hill climbs, tarmac rally |
| ER (this kit) | I-14-ER, camber/caster top mounts | 7/10 | 2-way, 30 clicks per direction, external reservoir | Serious track and competition use |
| ZX | I-14-ZX | 6/9 | 3-way (20/12/30 clicks), external reservoir | Competition, long sessions, drifting |
| ZR | I-14-ZR, camber/caster top mounts | 8/12 | 3-way (20/12/30 clicks), external reservoir | Competitive motorsport |
For the BMW E46 M3 True Rear, BC Racing has separate kits. Their part numbers start with I-64.
Frequently asked questions
What is the difference between the BC Racing ER and RM for the E46 M3 Coupe?
The ER coilover kit E46 M3 has an external reservoir and lets you set compression and rebound each separately. The RM is 1-way: compression and rebound are adjusted together.
Why does the BC Racing ER coilover kit for the E46 M3 Coupe have 7/10 kg/mm and not 6/9 kg/mm?
BC Racing supplies the ER for the M3 Coupe as standard with stiffer springs (7/10 kg/mm) than the BR and DS (6/9 kg/mm), in keeping with the track character of this series.
Can I get rubber top mounts for the BC Racing ER coilover kit for the E46 M3?
Yes, rubber top mounts are optional on the ER series. Contact us if you would prefer them, and we will look at the options and the delivery time.
What is the delivery time of this BC Racing ER coilover kit?
The delivery time is normally 1 to 2 weeks as long as the manufacturer has stock. You can also order when it is out of stock; we will let you know when the kit 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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