How do I adjust the rebound damping on these coilovers?

You can adjust the rebound damping using the knob on the top of each damper. There are 12 distinct positions, each offering a different feel and response for your driving needs.

What is the benefit of a monotube damper design?

Monotube dampers use a large piston to control rebound damping, which prevents aeration and foaming. This results in more responsive valving and consistent performance, especially under demanding conditions.

Are these coilovers suitable for both track and street use?

Yes, these coilovers are designed to offer a combination of track performance and ideal road balance. You can optimize grip for the track or fine-tune the setup for daily driving by adjusting rebound and ride height.

Specifications

Brand: AST
Part #: ACC-B2203SD
UPC: astACC-B2203SD

AST 06-08 BMW Z4 M Coupe/Convertible - E85/E86 5100 Comp Series Coilovers

Name: AST 06-08 BMW Z4 M Coupe/Convertible - E85/E86 5100 Comp Series Coilovers
Brand: AST
SKU: ast-ast-06-08-bmw-z4-m-coupe-convertible-e85-e86-5100-comp-series-coilovers-t14-562802
Price: 5790.08 USD
Availability: BackOrder

$5790.08

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2006-2008 BMW Z4. AST 5100 Comp Series coilovers let you adjust rebound and ride height for track or street.

Key Features

Direct fit — verified for 2006-2008 BMW Z4 M Coupe/Convertible.
Monotube dampers — offer a large piston for precise rebound damping control.
1-way adjustable rebound — control the return stroke of the dampers for tailored road balance.
Adjustable ride height — set your vehicle's stance and center of gravity.
Front and rear dampers utilize a coilover design — prioritizes adjustability and performance.
Camber-adjustable front top mounts — allow for more wheel alignment adjustments to improve front-end grip.

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About this part

Product Details

AST makes this 5100 Comp Series coilover set for the 2006-2008 BMW Z4 M Coupe and Convertible (E85/E86). These are built for drivers who want track-ready grip but also need a balanced setup for daily driving. You can fine-tune your car's handling by adjusting rebound damping and ride height.

The monotube design uses a large piston for precise rebound control, preventing aeration and foaming for more responsive damping. This means more consistent handling, especially during hard driving. The initial spring rates and setup are based on AST's extensive development and testing.