Description
BMW E91/E93 3 Series Touring/Convertible RWD (05-11) BC Racing ZX coilover kit 5.5/10 kg/mm
The BC Racing ZX coilover kit E91 E93 (part number I-17-ZX) 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.
According to BC Racing, the ZX series combines the DS and the ER: an upright monotube with dual piston and external reservoir, 3-way adjustable. It is intended for competitive track work, long sessions and demanding drifting.
You set the low-speed compression in 20 clicks, the high-speed compression in 12 clicks and the rebound in 30 clicks. For the rear-wheel-drive Touring and Convertible, the springs come out at 5.5 kg/mm front and 10 kg/mm rear.
Key benefits
- 3-way adjustable: 20 clicks low-speed compression, 12 clicks high-speed compression and 30 clicks rebound.
- External reservoir: with a dual piston in an upright monotube.
- Racing oil: with a very high viscosity index.
- Digressive damping: for control on track.
- Replaceable upper mount: with camber plates on suitable kits and rubber top mounts as an option.
- For long sessions and drifting: made for competitive track work.
- 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
- Competitive track work with an E91 or E93
- Long sessions on track
- Demanding drifting with a Touring or Convertible
Technical specifications
- Manufacturer: BC Racing
- Part number: I-17-ZX
- Series: ZX, 3-way with external reservoir
- Spring rate front/rear: 5.5/10 kg/mm
- Damper design: upright monotube with dual piston and external reservoir, digressive, racing oil with a very high viscosity index
- Damping: 3-way, 20 clicks low-speed compression, 12 clicks high-speed compression, 30 clicks rebound
- Ride height: steplessly adjustable via the damper body
- Top mounts: replaceable upper mount, 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 a mechanic with experience in motorsport suspension, including the positioning of the reservoirs. After setting the ride height, a new wheel alignment is required. 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 let you know when the kit arrives.
The BC Racing ZX kit I-17-ZX for the BMW E91 and E93 is 3-way adjustable: 20 clicks low-speed compression, 12 clicks high-speed compression and 30 clicks rebound.
Why choose this ZX coilover kit E91 E93?
With three separate adjustments, the ZX offers more adjustment options than the BR, DS, RM and ER for the E91 and E93. This lets you tune slow and fast body movements independently of each other, which helps during long sessions and when drifting. The springs are 5.5/10 kg/mm, just like the other series for this car.
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 | I-17-ER | 5.5/10 | 2-way, 30 clicks per direction, external reservoir | Serious track and competition use |
| ZX (this kit) | 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 ZX and ER coilover kits for the BMW E91 and E93?
The ZX is 3-way adjustable, the ER 2-way. On the ZX you set the compression separately for low speed (20 clicks) and high speed (12 clicks), alongside 30 clicks of rebound. Both have an external reservoir and, for the E91 and E93, springs of 5.5/10 kg/mm.
Is the BC Racing ZX coilover kit I-17-ZX suitable for the BMW M3 or an xDrive?
No. BC Racing releases the I-17-ZX for the E91 Touring and E93 Convertible with rear-wheel drive from 2005 to 2011, excluding the M3. Four-wheel-drive xDrive versions are not part of this application, and for the E90 Sedan and E92 Coupe there are I-03 kits.
Can you drift an E91 or E93 with the BC Racing ZX coilover kit?
Yes, according to BC Racing the ZX is made for competitive track work, long sessions and demanding drifting. With the ZX coilover kit E91 E93 you set low-speed and high-speed compression separately.
How long is the delivery time of the BC Racing ZX coilover kit for the E91 and E93?
The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If the kit is temporarily unavailable, you can still order it 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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