• AST Suspension 5100 Series Coilovers (Excludes Front/Rear Top Mounts) (True Coilover) - 2007-2016 Audi A5 4.2 FSI (B8)
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AST 5100 Series Coilovers | Audi A5 4.2 FSI/B8 (08-16) (ACU-A2109S)

AST 5100 Series Coilovers | Audi A5 4.2 FSI/B8 (08-16) (ACU-A2109S)

ACU-A2109S

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The AST 5100 Series Coilovers for the Audi A5 4.2 FSI (B8) are high-performance suspension components designed to enhance handling and stability. Featuring inverted/upside-down shock absorber technology, these coilovers are race-proven and deliver superior strength and durability. The design improves suspension geometry under heavy lateral and braking forces, making them ideal for spirited driving on both street and track. The 5100 Series offers adjustable rebound damping via a single knob, allowing for fine-tuning of ride characteristics. Constructed with high-quality materials, these coilovers provide a significant upgrade over standard twin-tube shocks, ensuring improved responsiveness and control.

Designed specifically for 2008-2016 Audi A5 models with the 4.2 FSI engine, these coilovers are a direct bolt-on upgrade for the B8 chassis. They are suitable for enthusiasts seeking enhanced performance in aggressive driving scenarios, including track days and spirited street driving. Installation involves replacing the factory shocks with these coilovers, which include all necessary mounting hardware. Compatibility is optimized for vehicles with the B8 chassis, and no additional modifications are typically required. These coilovers are ideal for drivers looking to lower their vehicle and improve handling dynamics while maintaining ride quality.

Overview

The 5100 Series shock absorbers for the 2007-2016 Audi A5 4.2 FSI (B8) utilize inverted / upside down technology. The inverted design is race proven technology and produces an extremely strong damper, providing better suspension geometry under heavy lateral and braking loads as seen in a road and track environment.

The 5100 Series shock absorbers give your car a better performance than the standard twin tube design. With the 5100 Series suspension you can adjust rebound with one knob. The adjust platform allows you to adjust the ride height of your car. AST suspension shock bodies are specially designed to keep maximum stroke, even with a lower ride height.

How a Monotube design works?

Monotube design is essential for performance. The oil and nitrogen are separated by a floating piston, and allows the use of a larger piston, increasing the damper performance and sensitivity felt by the driver, all this added together produces more grip, gives more control and driver feedback from your vehicle.

What is a rebound adjustment?

Rebound controls the rate of extension of your shock absorber. By changing the rebound you can directly change the characteristics of the vehicle.

Features

  • Floating piston design with high pressure nitrogen means no cavitation around the piston.
  • 14mm diameter internal shaft.
  • 44.5 mm diameter shaft struts, inverted.
  • Steel cylinder body shocks, inverted.
  • High end, track ready suspension.
  • Rebound adjustable ('Singles').
  • Low friction seal.
  • Adjuster knobs permanently mounted on the dampers.
  • Designed to use OEM top mounts.
  • Rubber bushings for 'eye' shock mounts.
  • Includes springs.
  • Rebuildable.
  • Optional spherical top mounts.
  • Optional DLC (diamond like carbon) coated shafts.
  • Optional DDP (double digressive piston).
    • Double Digressive Pistons are recommended for use on the non-driven wheels.
    • 4WD/FWD vehicles: DD pistons for both rear axle struts/shocks.
    • RWD vehicles: DD pistons for both front axle struts/shocks.
  • Optional custom valving.
Specifications
  • Part Number: ACU-A2109S
  • Product: AST 5100 Series
  • Adjustment: 1 Way
  • System: Coil Over
  • Product Note: True Coilover
  • Front/Rear Ratio: Front = 60% / Rear = 40%
  • Strut/Shock Type: Front: Clamp McPherson strut / Rear: Eye 2 pin strut
  • Model Years: 2007-2016
  • Make: Audi
  • Model: A5
  • Chassis: B8
  • Spring Kit: Included
  • Top Mounts: Front / Rear Optional (If Available)
  • Optional 1 Front Top Mounts: Not Available
  • Optional 2 Front Top Mounts: Not Available
  • Optional Rear Top Mounts: Not Available
  • Adjustable Front Droplinks Available? No
  • Adjustable Front Droplinks Required? No
  • Adjustable Rear Droplinks Available? No
  • Adjustable Rear Droplinks Required? No
  • DDP Pistons Included? No
  • DDP Pistons Available? Yes
  • DLC Coated Shafts Included? No
  • DLC Coated Shafts Available? Yes
  • QDC Included? No
  • TUV Approved?
  • Comments: Works with OE top mounts. Formed springs front and rear. No other spring options available.
Vehicle Fitment
  • 2007 Audi A5 4.2 FSI (B8)
  • 2008 Audi A5 4.2 FSI (B8)
  • 2009 Audi A5 4.2 FSI (B8)
  • 2010 Audi A5 4.2 FSI (B8)
  • 2011 Audi A5 4.2 FSI (B8)
  • 2012 Audi A5 4.2 FSI (B8)
  • 2013 Audi A5 4.2 FSI (B8)
  • 2014 Audi A5 4.2 FSI (B8)
  • 2015 Audi A5 4.2 FSI (B8)
  • 2016 Audi A5 4.2 FSI (B8)
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