• AST Suspension 5100 Series Coilovers (Excludes Front/Rear Top Mounts) - 1988-1990 BMW M3 2.3 (E30)
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AST Suspension 5100 Series Coilovers (Excludes Front/Rear Top Mounts) - 1988-1990 BMW M3 2.3 (E30)

AST Suspension 5100 Series Coilovers (Excludes Front/Rear Top Mounts) - 1988-1990 BMW M3 2.3 (E30)

ACU-B1502S

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The AST 5100 Series Coilovers for the 1988-1990 BMW M3 2.3 (E30) are high-performance suspension components designed to enhance handling and stability. Featuring inverted, upside-down damper technology, these coilovers are race-proven and deliver superior strength and durability compared to standard twin-tube shocks. They improve suspension geometry under heavy lateral and braking loads, making them ideal for spirited street driving and track use. The adjustable rebound feature allows for precise tuning with a single knob, enabling drivers to optimize ride quality and handling characteristics for various conditions. Constructed with high-quality materials, these coilovers provide a significant upgrade in performance, responsiveness, and control.

Designed to fit 1988-1990 BMW M3 2.3 models, these coilovers are a direct replacement for the factory suspension components, offering a bolt-on installation process. They are intended for enthusiasts seeking improved handling on both street and track environments, with a focus on aggressive driving and performance tuning. The kit excludes front and rear top mounts, allowing for customization based on existing or upgraded mounting hardware. Suitable for use in racing, track days, or spirited street driving, these coilovers help maximize the vehicle’s suspension capabilities and overall driving experience.

Overview

The 5100 Series shock absorbers for the 1988-1990 BMW M3 2.3 (E30) 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-B1502S
  • Product: AST 5100 Series
  • Adjustment: 1 Way
  • System: Separate Setup
  • Product Note: Non Coilover
  • Front/Rear Ratio: Front = 70% / Rear = 30%
  • Strut/Shock Type: Front: Uses OEM spindles / Rear: Eye 2 pin strut
  • Model Years: 1988-1990
  • Make: BMW
  • Model: M3
  • Chassis: E30
  • Spring Kit: Included
  • Top Mounts: Front / Rear Optional (If Available)
  • Optional 1 Front Top Mounts: TMA-B02-A1-20F - Camber adjustable
  • Optional 2 Front Top Mounts: Not Available
  • Optional Rear Top Mounts: TMA-B01-B1-30R - Solid top mounts (no camber adjustment)
  • 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: We recommend using OE top mounts. Original front spindles needed before start of production.
Vehicle Fitment
  • 1988 BMW M3 2.3 (E30)
  • 1989 BMW M3 2.3 (E30)
  • 1990 BMW M3 2.3 (E30)
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