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Description

BMW F80/F82 M3/M4 3-bolt top mount (14-20) BC Racing ER coilover kit 6/12 kg/mm

The BC Racing ER coilover kit M3 M4 F80 3-bolt (part number I-49-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 3 bolts, model years 2014 to 2020. The spring rate is 6 kg/mm front and 12 kg/mm rear.

BC Racing’s ER series is made for serious track and competition use. The difference from the BR and DS lies in the 2-way adjustment: you set compression and rebound separately, each in 30 clicks. The monotube damper works with a twin piston, an external reservoir, a digressive characteristic and fully synthetic oil.

The kit is intended for the M3 F80 and M4 F82 with a front top mount fixed in the strut tower with 3 bolts. BC Racing makes a separate ER for cars with a 5-bolt top mount, so check this before you order.

Key benefits

• 2-way adjustable: compression and rebound separately, 30 clicks each.
• External reservoir: with a twin piston in the monotube damper.
• Digressive damping: a lot of control over slow body movements.
• Fully synthetic oil: with a very high viscosity index.
• Spring rate 6/12 kg/mm: for the M3 F80 and M4 F82 with 3-bolt top mount.
• Camber plates: rubber top mounts are optional.
• Concave lock ring: holds the set ride height in place.
• 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 fixed in the strut tower with 3 bolts. Not for cars with a 5-bolt front top mount (there are separate kits for those, I-68) and not for the M4 F83 Convertible, for which BC Racing makes its own kits.

• Serious track days and club races
• Tuning compression and rebound separately to the track and tyres
• An M3 or M4 that is mainly driven on track

Technical specifications

• Manufacturer: BC Racing
• Part number: I-49-ER
• Series: ER, for serious track and competition use
• Version: for cars with a front top mount with 3 bolts (3-bolt FTM)
• Spring rate front/rear: 6/12 kg/mm
• Damper design: monotube with twin piston and external reservoir, digressive, fully synthetic oil with a very high viscosity index
• Damping: 2-way, compression and rebound separately, 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, and check beforehand whether the front top mount is fixed with 3 bolts; position the external reservoirs so that the lines stay clear of moving parts. After adjusting the ride height, have the wheel alignment reset. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If the kit is temporarily unavailable from BC Racing, you can still order and we will let you know the expected delivery date.

The BC Racing ER kit I-49-ER for the BMW M3 F80 and M4 F82 with 3-bolt top mount is 2-way adjustable, with 30 clicks for compression and 30 clicks for rebound.

Why choose this ER coilover kit M3 M4 F80 3-bolt?

On track you want to be able to tune compression and rebound separately, for example to let the M3 or M4 turn in briskly without it bouncing after a kerb. The ER makes that possible, thanks to the 2-way adjustment and the external reservoir. It is the step between the single-adjustable DS and the 3-way ZX.

BC Racing coilover kits for the BMW M3 F80 and M4 F82 with 3-bolt top mounts

Overview of the BC Racing series for the BMW M3 F80 and M4 F82 with 3-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 5-bolt top mounts, BC Racing has separate kits. Their part numbers start with I-68.

Frequently asked questions

Is the BC Racing ER coilover kit I-49-ER intended for the BMW M3 F80 and the M4 F82?

Yes. The kit fits the M3 F80 Sedan and the M4 F82 Coupe with rear-wheel drive, model years 2014 to 2020, whose front top mount is fixed with 3 bolts. BC Racing UK lists it under the M3 F80; for the M4 F83 Convertible there are separate BC Racing kits.

How do I know which BC Racing ER I need for my BMW M3 F80 or M4 F82: 3-bolt or 5-bolt?

You determine this by counting the bolts on the front strut tower. With 3 bolts you order this ER coilover kit M3 M4 F80 3-bolt, with 5 bolts the ER kit I-68-ER. If you cannot work it out, contact us.

What is the difference between the BC Racing ER and ZX for the BMW M3 F80 and M4 F82 with 3-bolt top mount?

The ER is 2-way adjustable, the ZX (I-49-ZX) 3-way. With the ZX you set the compression separately for low speed (20 clicks) and high speed (12 clicks), plus 30 clicks of rebound. Both have an external reservoir and 6/12 kg/mm.

What is the delivery time of the BC Racing ER coilover kit for the BMW M3 F80 and M4 F82?

Normally 1 to 2 weeks, as long as the manufacturer has stock. If it is temporarily out of stock, you can still order it and we will let you know when it will be delivered.

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.