• AST Suspension 5100 Series Coilovers (Excludes Front/Rear Top Mounts) - 2005-2011 Ford Focus ST 2.5 (2nd Gen)
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AST 5100 Series Coilovers | Ford Focus ST 05-11 (ACU-F1101S)

AST 5100 Series Coilovers | Ford Focus ST 05-11 (ACU-F1101S)

ACU-F1101S

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$3,175.00 USD
$3,810.00 USD $3,175.00 USD
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The AST 5100 Series Coilovers for the Ford Focus ST 2005-2011 are high-performance suspension components designed to enhance handling and stability. Featuring inverted shock absorber technology, these coilovers utilize race-proven design principles to deliver increased strength and durability. The inverted configuration improves suspension geometry under heavy lateral and braking forces, making them ideal for spirited driving on both road and track. The 5100 Series coilovers provide adjustable rebound damping via a single knob, allowing for precise tuning to match driving preferences and conditions. Constructed with high-quality materials, these coilovers offer improved performance over standard twin-tube shocks, ensuring better control and responsiveness during aggressive driving.

Designed specifically for 2005-2011 Ford Focus ST models with the 2.5-liter engine, these coilovers are a direct bolt-on upgrade that maintains compatibility with the vehicle’s existing suspension setup. They are suitable for street, track, or spirited driving, providing a significant upgrade in handling and ride quality. Installation is straightforward for those familiar with suspension work, and the kit includes the necessary components for a complete upgrade. These coilovers are ideal for enthusiasts seeking improved cornering, reduced body roll, and enhanced overall vehicle dynamics without compromising daily drivability.

Overview

The 5100 Series shock absorbers for the 2005-2011 Ford Focus ST 2.5 (2nd Gen) 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-F1101S
  • Product: AST 5100 Series
  • Adjustment: 1 Way
  • System: Separate Setup
  • Product Note: Non Coilover
  • Front/Rear Ratio: Front = 60% / Rear = 40%
  • Strut/Shock Type: Front: Clamp McPherson strut / Rear: Eye 2 pin strut
  • Model Years: 2005-2011
  • Make: Ford
  • Model: Focus
  • Chassis: 2nd Gen
  • Spring Kit: Included
  • Top Mounts: Front / Rear Optional (If Available)
  • Optional 1 Front Top Mounts: TMA-F03-A1-20F - Camber adjustable
  • Optional 2 Front Top Mounts: TMA-F03-B1-20F - Solid top mounts (no camber adjustment)
  • 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.
Vehicle Fitment
  • 2005 Ford Focus ST 2.5 (2nd Gen)
  • 2006 Ford Focus ST 2.5 (2nd Gen)
  • 2007 Ford Focus ST 2.5 (2nd Gen)
  • 2008 Ford Focus ST 2.5 (2nd Gen)
  • 2009 Ford Focus ST 2.5 (2nd Gen)
  • 2010 Ford Focus ST 2.5 (2nd Gen)
  • 2011 Ford Focus ST 2.5 (2nd Gen)
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