Description
BMW E46 3 Series Convertible (98-06) BC Racing ER coilover kit 5.5/8 kg/mm
The BC Racing ER coilover kit E46 Convertible (part number I-90-ER) is a coilover kit adjustable in height and damping, also simply called a coilover, for the BMW 3 Series E46 Convertible, model years 1998 to 2006. The spring rate is 5.5 kg/mm front and 8 kg/mm rear.
It is the 2-way adjustable BC Racing kit with external reservoirs. The ER series is made for serious track work and competition, for drivers who want to set compression and rebound separately.
Each damper is a monotube with a double piston and an external reservoir. Compression and rebound each have 30 clicks and adjust independently of each other. This lets you, for example, set firm compression for a flat car on turn-in, while the rebound stays calm enough to keep the tyres on the tarmac. The tuning is digressive, the oil fully synthetic with an ultra-high viscosity index, and the spring rate is 5.5/8 kg/mm.
BC Racing only releases part number I-90 for the E46 Convertible. For the E46 Sedan, Coupe, Touring and Compact there is the I-02.
Key benefits
- 2-way adjustable: compression and rebound 30 clicks each, independently of each other.
- External reservoirs: more oil, so more stable damping during long sessions.
- Double piston: monotube construction for heavy track loads.
- Digressive tuning: tight during weight transfer, more supple over fast impacts.
- Synthetic oil: ultra-high viscosity index for less variation with heat.
- Camber plates: on suitable kits, rubber top mounts optional.
- Concave lock ring: locks reliably.
- Spring rate 5.5/8 kg/mm: for the E46 Convertible.
Suitable for
BMW 3 Series E46 Convertible, model years 1998 to 2006 (BC Racing part number I-90)
- Serious track days and circuit competition
- High-level drifting
- Drivers who want to adjust the car per circuit or per session
Technical specifications
- Manufacturer: BC Racing
- Part number: I-90-ER
- Series: ER, 2-way with external reservoir
- Spring rate front/rear: 5.5/8 kg/mm
- Damper design: monotube with double piston and external reservoir, digressive
- Damping: 2-way, compression and rebound 30 clicks each, independent
- Ride height: steplessly adjustable via the damper body
- 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. With this track-focused series, noise is not covered by the warranty
Fitting and delivery
During fitting, the reservoirs are also given a fixed position, with the lines routed neatly away from moving parts and the exhaust. A mechanic with experience of track suspension is the right choice here. After setting the ride height, the E46 should have a wheel alignment. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If the kit is temporarily out of stock, you can still order and we will keep you informed.
Setting compression and rebound separately is the step that takes an E46 from fast to truly consistent.
Why choose this ER coilover kit E46 Convertible?
With a 1-way kit you always change compression and rebound together, and on track that is often a compromise. The ER removes that compromise and, with the reservoirs, gives you enough reserve for long sessions. For an E46 that is used seriously, that is the logical next step.
BC Racing coilover kits for the BMW E46 Convertible
Overview of the BC Racing series for the BMW E46 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-90-BR-RA | 6/8 | 30 clicks, linear | Road with the occasional track day |
| DS | I-90-DS-DA | 6/8 | 30 clicks, digressive | Track-focused, sporty road use |
| RM | I-90-RM-MA | 5.5/8 | 30 clicks, digressive, synthetic oil | Track days, hill climbs, tarmac rally |
| ER (this kit) | I-90-ER | 5.5/8 | 2-way, 30 clicks per direction, external reservoir | Serious track and competition use |
| HM | I-90-HM | 5.5/8 | 2-way, 30 clicks per direction, external reservoir | Serious track use |
| ZX | I-90-ZX | 5.5/8 | 3-way (20/12/30 clicks), external reservoir | Competition, long sessions, drift |
| ZR | I-90-ZR | 5.5/8 | 3-way (20/12/30 clicks), external reservoir | Competitive motorsport |
Frequently asked questions
What is the difference between the BC Racing ER and ZX for the E46 Convertible?
The ER coilover kit E46 Convertible is 2-way (compression and rebound separate), the ZX is 3-way. The ZX splits the compression into low and high speed, which gives even more adjustment options.
Does this kit also fit an E46 Sedan, Coupe or Touring?
No. BC Racing only releases this kit for the E46 Convertible. For the Sedan, Coupe, Touring and Compact there is the I-02.
Is a check valve available for the BC Racing ER coilover kit for the E46?
Yes, BC Racing offers a check valve as an option for the ER series. Ask us about the possibilities for this kit.
What is the delivery time of this BC Racing ER coilover kit?
The delivery time is usually 1 to 2 weeks as long as the manufacturer has stock. If it is out of stock, you can still order and we will let you know when it arrives.
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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