• AST Suspension 5100 Series Coilovers (Includes Front/Rear Top Mounts) (True Coilover) - 1984-1991 BMW 3 Series 323i (E30)
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AST 5100 Series Coilovers | BMW E30 3 Series (84-91) (ACC-B1503S)

AST 5100 Series Coilovers | BMW E30 3 Series (84-91) (ACC-B1503S)

ACC-B1503S

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The AST 5100 Series Coilovers for the BMW E30 3 Series (1984-1991) 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 increased strength and durability under demanding driving conditions. The design improves suspension geometry during heavy lateral and braking loads, making them ideal for spirited street driving or track use. The coilovers allow for adjustable rebound damping via a single knob, providing precise tuning for various driving styles and conditions. Constructed with high-quality materials, these coilovers offer a significant upgrade over standard twin-tube shocks, ensuring improved responsiveness and control.

Designed specifically for 1984-1991 BMW E30 3 Series models, including the 323i, these coilovers are a direct bolt-on upgrade that maintains compatibility with the factory chassis. They are suitable for street, track, or autocross applications where enhanced suspension performance is desired. Installation is straightforward, with the kit including all necessary components for a complete upgrade. These coilovers are ideal for enthusiasts seeking improved handling, adjustable ride height, and race-inspired damping performance on their E30 chassis. Proper fitment and performance benefits make them a top choice for serious drivers and tuners.

Overview

The 5100 Series shock absorbers for the 1984-1991 BMW 3 Series 323i (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: ACC-B1503S
  • Product: AST 5100 Series
  • Adjustment: 1 Way
  • System: Coil Over
  • Product Note: True Coilover
  • Front/Rear Ratio: Front = 70% / Rear = 30%
  • Strut/Shock Type: Front: Uses OEM spindles / Rear: Eye 2 pin strut
  • Model Years: 1984-1991
  • Make: BMW
  • Model: 3 Series
  • Chassis: E30
  • Spring Kit: Included
  • Top Mounts: Front / Rear Included
  • Front Top Mounts: TMA-B02-A1-20F - Camber adjustable
  • Optional Front Top Mounts: Not Available
  • 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: Works with OE top mounts. Original front spindles needed before start of production.
Vehicle Fitment
  • 1984 BMW 3 Series 323i (E30)
  • 1985 BMW 3 Series 323i (E30)
  • 1986 BMW 3 Series 323i (E30)
  • 1987 BMW 3 Series 323i (E30)
  • 1988 BMW 3 Series 323i (E30)
  • 1989 BMW 3 Series 323i (E30)
  • 1990 BMW 3 Series 323i (E30)
  • 1991 BMW 3 Series 323i (E30)
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