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Description

BMW E85 Z4 (02-08) BC Racing DS coilover kit 5/8 kg/mm

The BC Racing DS coilover kit Z4 E85 (part number I-12-DS-DA) is a coilover kit adjustable in height and damping, also simply called a coilover, for the BMW Z4 E85 with rear-wheel drive, model years 2002 to 2008. The spring rate is 5 kg/mm front and 8 kg/mm rear.

With the DS series you choose the track side of BC Racing. The digressive piston damps more firmly at low piston speeds (0 to 50 mm/s), the range in which the body rolls and dives. This keeps the Z4 E85 flatter when turning in and braking.

The kit is made for drivers who regularly use their Z4 Roadster on track and also drive it in a sporty way on the road. You can recognise the DS by its satin chrome damper body; as with the BR, you set the ride height independently of the spring preload.

Key benefits

• Digressive damping: more control over body roll and dive.
• Track-focused: for regular track days with the Z4 E85.
• 30-click adjustment: compression and rebound together.
• Height independent of the spring preload: lower the car via the damper body.
• Spring rate 5/8 kg/mm: the same springs as the BR for the Z4 E85.
• Pillowball top mounts or camber plates at the front: rubber or the original mounting at the rear.
• Satin chrome damper body: typical of the DS series.
• Rebuildable: the dampers can be rebuilt.

Suitable for

BMW Z4 Roadster E85 with rear-wheel drive, model years 2002 to 2008; for the Z4 M, BC Racing supplies a separate kit

• Regular track days
• Sporty road use with the emphasis on control
• A Z4 that needs to stay flatter through fast corners

Technical specifications

• Manufacturer: BC Racing
• Part number: I-12-DS-DA
• Series: DS, track-focused, with satin chrome damper body
• Spring rate front/rear: 5/8 kg/mm
• Damper design: monotube with digressive piston, firmer damping at low piston speed (0 to 50 mm/s)
• Damping: 30 clicks, compression and rebound simultaneously
• Ride height: adjustable via the damper body, independent of the spring preload
• Top mounts: pillowball top mounts or camber plates at the front, rubber or original mounting at the rear
• 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

This coilover kit is vehicle-specific and takes the place of the original dampers and springs. We recommend having it fitted by an experienced mechanic. On some cars the pillowball top mount at the front requires a small modification to the upper mounting; if in doubt, contact us. A wheel alignment after setting the height is required, especially for track use. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If the kit is temporarily out of stock at BC Racing, you can still order and we will keep you informed.

The BC Racing DS for the BMW Z4 E85 damps more firmly at low piston speeds thanks to a digressive piston and is adjustable in 30 clicks.

Why choose this DS coilover kit Z4 E85?

The DS gives your Z4 E85 more control on track than a road-focused kit, without making the car unusable on the way to the circuit. You adjust the damping in 30 steps and the height independently of the spring preload, and after intensive use you have the dampers rebuilt.

BC Racing coilover kits for the BMW Z4 E85

Overview of the BC Racing series for the BMW Z4 E85 supplied by Race4DriftParts, with the BC Racing part number. Spring rates in kg/mm, front/rear.

For the BMW Z4 M E85, BC Racing has separate kits. Their part numbers start with I-22.

Frequently asked questions

What is the difference between the BC Racing DS and BR for the Z4 E85?

The DS coilover kit Z4 E85 has a digressive piston and is track-focused; the BR has a linear piston and is intended for the road with the occasional track day. The spring rate (5/8 kg/mm) and the number of clicks (30) are the same.

Does the BC Racing DS for the Z4 E85 also fit a Z4 Coupe E86?

That has not been confirmed. BC Racing UK lists this kit for the Z4 E85 with rear-wheel drive, model years 2002 to 2008, without a separate mention of the Coupe E86. If you have a Coupe, please contact us before ordering; for the Z4 M there is a dedicated DS kit (I-22-DS-DA).

Is noise covered by the warranty of the BC Racing DS for the Z4 E85?

No. Noise from track use is not covered by the warranty; manufacturing defects are, for 1 year.

What is the delivery time of the BC Racing DS coilover kit for the BMW Z4 E85?

1 to 2 weeks, as long as the manufacturer has stock. If the kit is temporarily unavailable, you can still order and we will 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.