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Description

BMW E85 Z4 M (06-08) BC Racing DS coilover kit 5/8 kg/mm

The BC Racing DS coilover kit Z4 M (part number I-22-DS-DA) is a coilover kit adjustable in height and damping, also simply called a coilover, for the BMW Z4 M (E85), model years 2006 to 2008. The spring rate is 5 kg/mm front and 8 kg/mm rear.

Anyone who regularly drives a Z4 M on track is looking for a suspension that keeps the body under control. That is what the DS series is for: the digressive piston damps more firmly at low piston speeds (0 to 50 mm/s), so the car rolls and dives less.

This kit has its own part number for the Z4 M Roadster, separate from the DS for the regular Z4 E85. The satin chrome damper body, the concave lower lock ring and the ride height that you set independently of the spring preload complete the package.

Key benefits

• Digressive piston: firmer damping at 0 to 50 mm/s.
• Dedicated kit for the Z4 M: part number I-22-DS-DA.
• 30 clicks: compression and rebound in one adjustment.
• Ride height independent of spring preload: adjustable via the damper body.
• Spring rate 5/8 kg/mm: the same as the BR kit for the Z4 M.
• Pillowball top mounts or camber plates at the front: rubber or the original mounting at the rear.
• Satin chrome damper body: the hallmark of the DS series.
• Rebuildable: the dampers can be rebuilt.

Suitable for

BMW Z4 M Roadster (E85) with rear-wheel drive, model years 2006 to 2008

• Track days with the Z4 M
• Sporty road use with a track-focused setup
• Less roll and dive under hard turn-in and braking

Technical specifications

• Manufacturer: BC Racing
• Part number: I-22-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

The DS kit is vehicle-specific and replaces the original dampers and springs of the Z4 M. 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. After setting the ride height, a wheel alignment is required, and for track use it pays to tailor it to your driving style. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If BC Racing temporarily has it out of stock, you can still order and we will let you know when it is coming.

The BC Racing DS for the BMW Z4 M has its own part number, I-22-DS-DA, a digressive piston and a spring rate of 5/8 kg/mm.

Why choose this DS coilover kit Z4 M?

Because on track the Z4 M demands more than a road-oriented kit offers. The DS keeps the body under tighter control and lets you tune it for each circuit in 30 clicks, while the car remains comfortable for everyday driving.

BC Racing coilover kits for the BMW Z4 M E85

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

For the regular BMW Z4 E85 (not the Z4 M), BC Racing has separate kits. Their part numbers start with I-12.

Frequently asked questions

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

The DS coilover kit Z4 M 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. Both have 5/8 kg/mm and 30 clicks.

What is the difference between the BC Racing DS and RM for the Z4 M?

The DS is a track-focused monotube that can also be used sportily on the road; the RM is aimed at track days, hill climbs and tarmac rally, has fully synthetic oil and needs periodic greasing. For the Z4 M, both have 5/8 kg/mm.

Does the BC Racing DS for the Z4 M also fit a Z4 M Coupe (E86) or a regular Z4?

For the Z4 M Coupe (E86) that has not been confirmed, and for the regular Z4 E85 there is a separate DS kit (I-12-DS-DA). BC Racing UK lists this kit for the Z4 M E85 (2006 to 2008) and does not mention the Coupe E86. If you drive a Z4 M Coupe, please contact us before ordering.

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

No, noise from track use is not covered by the warranty. Manufacturing defects are covered by the warranty for 1 year.

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

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

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.