Description
BMW E91/E93 3 Series Touring/Convertible RWD (05-11) BC Racing ER coilover kit 5.5/10 kg/mm
The BC Racing ER coilover kit E91 E93 (part number I-17-ER) is a coilover kit adjustable in height and damping, also simply called a coilover, for the BMW 3 Series E91 Touring and E93 Convertible with rear-wheel drive, excluding the M3, model years 2005 to 2011. The spring rate is 5.5 kg/mm front and 10 kg/mm rear.
The ER series is BC Racing’s kit with an external reservoir for serious track and competition use. Compression and rebound are each adjustable separately in 30 clicks (2-way), so you tune the compression and extension of the suspension independently of each other.
The monotube dampers have a dual piston, digressive damping and fully synthetic oil with a very high viscosity index. For the E91 Touring and E93 Convertible with rear-wheel drive, the springs are 5.5 kg/mm front and 10 kg/mm rear.
Key benefits
- 2-way adjustable: compression and rebound 30 clicks each, independently of each other.
- External reservoir with dual piston: for serious track use.
- Digressive damping: tuned for track and competition.
- Fully synthetic oil: with a very high viscosity index.
- Concave lock ring: holds the set height in place.
- Camber plates on suitable kits: rubber top mounts are optional.
- Stepless ride height adjustment: via the damper body.
- Rebuildable: the dampers can be rebuilt.
Suitable for
BMW 3 Series E91 Touring and E93 Convertible with rear-wheel drive, model years 2005 to 2011; not for the M3, the four-wheel-drive xDrive versions, the E90 Sedan and the E92 Coupe
- Serious track use with an E91 or E93
- Club races and competitions
- Drivers who want to adjust compression and rebound separately
Technical specifications
- Manufacturer: BC Racing
- Part number: I-17-ER
- Series: ER, 2-way with external reservoir
- Spring rate front/rear: 5.5/10 kg/mm
- Damper design: monotube with dual piston and external reservoir, digressive, fully synthetic oil with a very high viscosity index
- Damping: 2-way, 30 clicks compression and 30 clicks rebound, independently adjustable
- 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; noise from track use is not covered by the warranty
Fitting and delivery
The kit is vehicle-specific and replaces the original dampers and springs. We recommend having it fitted by an experienced mechanic, including the positioning of the reservoirs. After adjusting the height, have the wheel alignment set again. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If BC Racing does not have the kit in stock, you can still order and we will keep you informed.
On the BC Racing ER kit I-17-ER for the BMW E91 and E93, compression and rebound are each independently adjustable in 30 clicks.
Why choose this ER coilover kit E91 E93?
With the ER you tune your E91 or E93 more precisely than with a 1-way kit: for example, you can set the rebound stiffer without the compression changing with it. The external reservoir and the synthetic oil make the kit suitable for serious track and competition use. The springs are the same as those of the BR and DS, so the difference lies in the damper.
BC Racing coilover kits for the BMW E91 Touring and E93 Convertible
Overview of the BC Racing series for the BMW E91 Touring and E93 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-17-BR-RA | 5.5/10 | 30 clicks, linear, pillowball top mounts front | Road with the occasional track day |
| DS | I-17-DS-DA | 5.5/10 | 30 clicks, digressive, pillowball top mounts front | Track-focused, sporty road use |
| RM | I-17-RM-MA | 5.5/10 | 30 clicks, digressive, synthetic oil, pillowball top mounts front | Track days, hill climbs, tarmac rally |
| ER (this kit) | I-17-ER | 5.5/10 | 2-way, 30 clicks per direction, external reservoir | Serious track and competition use |
| ZX | I-17-ZX | 5.5/10 | 3-way (20/12/30 clicks), external reservoir | Competition, long sessions, drifting |
For the BMW E90 Sedan and E92 Coupe, BC Racing has separate kits. Their part numbers start with I-03.
Frequently asked questions
What is the difference between the BC Racing ER and ZX coilover kits for the BMW E91 and E93?
The ER is 2-way adjustable (30 clicks compression and 30 clicks rebound), the ZX 3-way (20 clicks low-speed compression, 12 clicks high-speed compression and 30 clicks rebound). Both have an external reservoir and, for the E91 and E93, springs of 5.5/10 kg/mm. The ZX therefore offers an extra adjustment for fast movements.
Does the BC Racing ER coilover kit I-17-ER fit an E90 Sedan or E92 Coupe?
No. BC Racing only releases the I-17-ER for the rear-wheel-drive E91 Touring and E93 Convertible from 2005 to 2011, without the M3. For the E90 and E92 there are separate kits with an I-03 part number.
Why choose a BC Racing ER coilover kit instead of a BR for the E91 or E93?
Because with the ER you set compression and rebound independently of each other and the damper has an external reservoir. That makes sense for serious track use; for the road with the occasional track day, the BR is sufficient. The ER coilover kit E91 E93 has the same springs as the BR.
What is the delivery time of the BC Racing ER coilover kit for the BMW E91 and E93?
The delivery time is 1 to 2 weeks as long as the manufacturer has stock. Even if the kit is temporarily out of stock, you can order; we will then 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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