Description
BMW E36 3 Series Compact (93-00) BC Racing ER coilover kit 6/8 kg/mm
The BC Racing ER coilover kit E36 Compact (part number I-25-ER) is a coilover kit adjustable in height and damping, also simply called a coilover, for the BMW 3 Series E36 Compact (E36/5), model years 1993 to 2000. The spring rate is 6 kg/mm front and 8 kg/mm rear.
This kit is 2-way adjustable and has external reservoirs. BC Racing developed the ER series for serious track work and competition, for drivers who want to adjust compression and rebound separately.
Each damper has 30 clicks of compression and 30 clicks of rebound, independent of each other. This lets you tackle, for example, dive under braking with the compression, and an unsettled rear on corner exit with the rebound. The monotube dampers have a dual-piston design with external reservoir, a digressive characteristic and fully synthetic oil with an ultra-high viscosity index.
This is the standard version with a separate spring and a separate damper at the rear. The spring rate is 6/8 kg/mm.
Key benefits
- 2-way adjustable: compression and rebound 30 clicks each, independent of each other.
- External reservoirs: more oil, so less damping fade after a full session.
- Digressive piston: tight control over body movements.
- Fully synthetic oil: with an ultra-high viscosity index for stable behaviour.
- Concave lock ring: keeps the height setting in place.
- Camber plates: rubber top mounts are optional.
- Check valve optional: available as an extra option for the ER series.
- Spring rate 6/8 kg/mm: for the standard rear layout of the Compact.
Suitable for
BMW 3 Series Compact E36/5, model years 1993 to 2000
- Serious track use and competition
- Drifting with many runs back to back
- Drivers who want to keep the original rear layout with separate spring and damper
Technical specifications
- Manufacturer: BC Racing
- Part number: I-25-ER
- Series: ER, 2-way with external reservoir
- Version: standard, separate spring and separate damper at the rear
- Spring rate front/rear: 6/8 kg/mm
- Damper design: monotube dual-piston with external reservoir, digressive
- Damping: 2-way, 30 clicks compression and 30 clicks rebound, independent
- Ride height: infinitely adjustable via the damper body
- Top mounts: camber plates, rubber top mounts optional; check valve 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 is not covered by the warranty
Fitting and delivery
The kit replaces the struts at the front and the damper and spring at the rear. Mount the reservoirs so that the hoses stay clear at full compression and full extension, and have the wheel alignment set after fitting. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If the manufacturer is temporarily out of stock, you can still order and we will keep you informed.
Separately adjustable compression and rebound turn the Compact into a car you can fine-tune for each circuit and each session.
Why choose this ER coilover kit E36 Compact?
Because with two separate knobs you solve one problem at a time in a targeted way, without changing your other setting. The reservoirs ensure that your setup is still right after a long session. A big step up from the DS and RM, for anyone who really uses the Compact in competition.
BC Racing coilover kits for the BMW E36 Compact
Overview of the BC Racing series for the BMW E36 Compact 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-25-BR-RA | 6/8 | 30 clicks, linear | Road with the occasional track day |
| DS | I-25-DS-DA | 5/8 | 30 clicks, digressive | Track-focused, sporty road use |
| RM | I-25-RM-MA | 6/6 | 30 clicks, digressive, synthetic oil | Track days, hill climbs, tarmac rally |
| RM | I-25-RM-MA | 6/8 | 30 clicks, digressive, synthetic oil | Track days, hill climbs, tarmac rally |
| ER (this kit) | I-25-ER | 6/8 | 2-way, 30 clicks per direction, external reservoir | Serious track and competition use |
| ZX | I-25-ZX | 6/8 | 3-way (20/12/30 clicks), external reservoir | Competition, long sessions, drifting |
For the BMW E36 Compact True Rear, BC Racing has separate kits. Their part numbers start with I-79.
Frequently asked questions
What is the difference between the BC Racing ER and DS for the E36 Compact?
The ER coilover kit E36 Compact has external reservoirs and adjusts compression and rebound separately in 30 clicks each. The DS adjusts compression and rebound together with one knob and has no reservoir.
Is the BC Racing ER for the E36 Compact also available as True Rear?
Yes, the BC Racing ER for the E36 Compact is also available in a True Rear version. In the True Rear version, the rear becomes a complete strut with the spring around the damper, instead of the separate spring and damper of this kit. That ER True Rear has a spring rate of 5/5 kg/mm.
What is a check valve on the BC Racing ER series?
A check valve is an option that BC Racing offers for the ER series. If you would like one included, contact us and we will look into the options for you.
What is the delivery time of this BC Racing ER coilover kit?
The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If BC Racing does not have it in 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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