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Description

BMW F80/F82 M3/M4 5-bolt top mount (14-20) BC Racing ER coilover kit 6/12 kg/mm

The BC Racing ER coilover kit M3 M4 F80 5-bolt (part number I-68-ER) is a coilover kit adjustable in height and damping, also simply called a coilover, for the BMW M3 F80 and M4 F82 with rear-wheel drive and front top mounts with 5 bolts, model years 2014 to 2020. The spring rate is 6 kg/mm front and 12 kg/mm rear.

The ER series is the 2-way adjustable coilover kit from BC Racing for serious track and competition use. Compression and rebound each have their own 30-click adjustment, so you can tune the turn-in and the rebound of the M3 or M4 independently of each other.

The monotube damper contains a dual piston and an external reservoir; the damping is digressive and BC Racing uses fully synthetic oil with a very high viscosity index. This kit is intended for the F80 and F82 with a front top mount with 5 bolts.

Key benefits

• Compression and rebound separately: each with 30 clicks of adjustment.
• External reservoir: with dual piston in the monotube damper.
• Digressive: firm damping during slow body movements.
• Synthetic oil: fully synthetic, with a very high viscosity index.
• Spring rate 6/12 kg/mm: for the M3 F80 and M4 F82 with 5-bolt top mount.
• Camber plates: with optional rubber top mounts.
• Concave lower lock ring: as on the BC Racing BR and DS.
• 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 a front top mount secured to the strut tower with 5 bolts. Not for cars with a 3-bolt front top mount (there are separate kits for those, I-49) and not for the M4 F83 Convertible, for which BC Racing makes its own kits.

• Club races and serious track days
• Tuning turn-in and rebound independently
• An M3 or M4 with the emphasis on track use

Technical specifications

• Manufacturer: BC Racing
• Part number: I-68-ER
• Series: ER, for serious track and competition use
• Version: for cars with a front top mount with 5 bolts (5-bolt FTM)
• Spring rate front/rear: 6/12 kg/mm
• Damper design: monotube with dual piston and external reservoir, digressive, fully synthetic oil with a very high viscosity index
• Damping: 2-way, compression and rebound independently, 30 clicks each
• Ride height: infinitely adjustable via the damper body
• Top mounts: camber plates, 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; check beforehand that the front top mount is secured with 5 bolts, and route the lines of the external reservoirs so that they do not rub against anything. Have the wheel alignment redone after setting the ride height. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If the ER is temporarily out of stock at BC Racing, you can still order and we will tell you the expected delivery date.

The BC Racing ER kit I-68-ER for the BMW M3 F80 and M4 F82 with 5-bolt top mount has an external reservoir, 6/12 kg/mm springs and 2-way adjustment with 30 clicks each.

Why choose this ER coilover kit M3 M4 F80 5-bolt?

With separate adjustment for compression and rebound, you can tune the M3 or M4 precisely to the circuit: quick turn-in without the car continuing to bob after a kerb. The ER gives you that freedom, with an external reservoir and digressive damping. If you also want to adjust high and low speed compression separately, take a look at the ZX.

BC Racing coilover kits for the BMW M3 F80 and M4 F82 with 5-bolt top mounts

Overview of the BC Racing series for the BMW M3 F80 and M4 F82 with 5-bolt top mounts supplied by Race4DriftParts, with the BC Racing part number. Spring rates in kg/mm, front/rear.

For the BMW M3 F80 and M4 F82 with 3-bolt top mounts, BC Racing has separate kits. Their part numbers start with I-49.

Frequently asked questions

Is the BC Racing ER coilover kit I-68-ER suitable for the BMW M3 F80 and M4 F82?

Yes, provided the front top mount is secured in the strut tower with 5 bolts. The kit is for the M3 F80 Sedan and M4 F82 Coupe with rear-wheel drive from 2014 to 2020; BC Racing UK lists it in its overview under the M3 F80. The M4 F83 Convertible has separate BC Racing kits.

How do I know whether the 5-bolt BC Racing ER fits my BMW M3 F80 or M4 F82?

Count the bolts on top of the front strut tower, around the top mount. With 5 bolts, this ER coilover kit M3 M4 F80 5-bolt fits; with 3 bolts, you need the ER kit I-49-ER. If in doubt, send us a photo or contact us.

What is the difference between the BC Racing ER and HM for the BMW M3 F80 and M4 F82 with 5-bolt top mount?

The difference lies in the construction: the HM (I-68-HM) combines the technology of the RM and the ER, with an inverted monotube on MacPherson struts and PTFE-coated steel-braided lines to the reservoir. Both are 2-way adjustable with 30 clicks per direction, have an external reservoir and are intended for serious track use. BC Racing advises periodic greasing of the HM and recommends it less for road use than the ER.

How long does delivery of the BC Racing ER coilover kit for the BMW M3 F80 and M4 F82 with 5-bolt top mount take?

Expect 1 to 2 weeks as long as the manufacturer has stock. Even if BC Racing is temporarily sold out, you can order; we will let you know when the kit 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.