Description
BMW F80/F82 M3/M4 5-bolt True Rear (14-20) BC Racing ZX coilover kit 6/6 kg/mm
The BC Racing ZX coilover kit M3 M4 F80 5-bolt True Rear (part number I-133-ZX) is a coilover kit adjustable in height and damping, also simply called a coilover, for the BMW M3 F80 and M4 F82 with front top mounts secured by 5 bolts, model years 2014 to 2020, in True Rear version. The spring rate is 6 kg/mm front and 6 kg/mm rear.
The ZX is BC Racing’s 3-way adjustable coilover kit for competitive track use, long sessions and demanding drifting. The kit combines the basis of the DS with the external reservoir of the ER; you set low-speed compression (20 clicks), high-speed compression (12 clicks) and rebound (30 clicks) each separately.
This True Rear version is made for the M3 F80 and M4 F82 with front top mounts secured by 5 bolts, with the spring around the damper at the rear as well. The upright monotube dampers with double piston are filled with race oil with a very high viscosity index.
Key benefits
- Three settings: low-speed and high-speed compression and rebound separately: 20, 12 and 30 clicks.
- External reservoir: with double piston in upright monotube dampers.
- Digressive: more control during slow body movements.
- Race oil: with a very high viscosity index.
- Replaceable upper mounting: camber plates on suitable kits, rubber top mounts optional.
- True Rear: a complete strut at the rear as well.
- For 5-bolt top mounts: on the M3 F80 and M4 F82.
- Rebuildable: the dampers can be rebuilt.
Suitable for
BMW M3 F80 Sedan and M4 F82 Coupe with rear-wheel drive, model years 2014 to 2020, with front top mounts secured to the strut tower with 5 bolts, in True Rear version. If the front top mounts are secured with 3 bolts, choose the I-132 kit. The M4 Convertible (F83) is not listed by BC Racing; please contact us for that version.
- Competitive track work and long sessions
- Drifting with an M3 or M4
- Fine-tuning low-speed and high-speed compression
Technical specifications
- Manufacturer: BC Racing
- Part number: I-133-ZX
- Series: ZX, 3-way with external reservoir
- Version: True Rear (integrated rear, a complete strut at the rear with the spring around the damper), for cars with front top mounts secured by 5 bolts
- Spring rate front/rear: 6/6 kg/mm
- Damper design: upright monotube with double piston and external reservoir, digressive, race oil with a very high viscosity index
- Damping: 3-way, 20 clicks low-speed compression, 12 clicks high-speed compression and 30 clicks rebound
- Ride height: continuously adjustable via the damper body
- Top mounts: replaceable upper mounting, camber plates on suitable kits, rubber top mounts optional
- Contents: 4 struts with dampers and springs, 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. Please note: BC Racing specifies that the body shell must be reinforced before a True Rear kit is fitted. Only order this kit if the front top mounts are secured with 5 bolts. After setting the height, have the alignment adjusted again and take the time to tune the three damping settings step by step. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If BC Racing temporarily has no stock, you can still order and we will let you know when the kit is coming.
For the BMW M3 F80 and M4 F82 with 5-bolt front top mounts, BC Racing supplies the 3-way ZX True Rear kit I-133-ZX, with external reservoir and 6/6 kg/mm springs.
Why choose this ZX coilover kit M3 M4 F80 5-bolt True Rear?
The ZX gives you three separate settings per damper, where the ER has two and the BR and DS have one. This lets you tune an M3 or M4 precisely for long sessions, changing circuits or drift work. With the True Rear construction and rebuildable dampers, the kit is made for intensive use.
BC Racing coilover kits for the BMW M3 F80 and M4 F82 True Rear with 5-bolt top mounts
Overview of the BC Racing series for the BMW M3 F80 and M4 F82 True Rear with 5-bolt top mounts 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-133-BR-RH | 6/6 | 30 clicks, linear, pillowball top mounts front and rear | Road with the occasional track day |
| DS | I-133-DS-DH | 6/6 | 30 clicks, digressive, pillowball top mounts front and rear | Track-focused, sporty road use |
| ER | I-133-ER | 6/6 | 2-way, 30 clicks per direction, external reservoir | Serious track and competition use |
| ZX (this kit) | I-133-ZX | 6/6 | 3-way (20/12/30 clicks), external reservoir | Competition, long sessions, drift |
For the standard version of the BMW M3 F80 and M4 F82 without True Rear, BC Racing has separate kits. Their part numbers start with I-68 (5-bolt top mounts) and I-49 (3-bolt top mounts). The True Rear kits for 3-bolt top mounts start with I-132.
Frequently asked questions
How do I choose between the BC Racing ZX True Rear coilover kit I-132-ZX and I-133-ZX for my BMW M3 F80 or M4 F82?
Look at the number of bolts on the front top mount: 5 bolts means the ZX coilover kit M3 M4 F80 5-bolt True Rear (I-133-ZX), 3 bolts the I-132-ZX. You count the bolts on top of the front strut towers. If in doubt, send us a photo or your chassis number.
Which BMW M3 F80 and M4 F82 does the BC Racing ZX True Rear coilover kit with 5-bolt top mounts fit?
The M3 F80 Sedan and M4 F82 Coupe with rear-wheel drive from 2014 to 2020 whose front top mounts are secured with 5 bolts. For the M4 Convertible (F83) the fitment has not been confirmed; please contact us.
What is the difference between the BC Racing ZX and ER True Rear coilover kits for the M3 F80 and M4 F82 with 5-bolt top mounts?
The ZX is 3-way adjustable, the ER 2-way. The ZX divides the compression into 20 clicks at low speed and 12 clicks at high speed, alongside 30 clicks of rebound; the ER has 30 clicks of compression and 30 clicks of rebound. The ZX is intended for competition and drift, the ER for serious track use.
How long is the delivery time of the BC Racing ZX True Rear coilover kit for the BMW M3 F80 and M4 F82?
Normally within 1 to 2 weeks as long as the manufacturer has stock. If the kit is temporarily unavailable, you can still order 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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