Product Details
The 5100 Series shock absorbers for the 1985-1991 BMW 3 Series 325i RWD (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.
Standard 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-B1503S |
| Part Name | 5100 Series Coilovers |
| Vehicle | 1985-1991 BMW 3 Series 325i RWD |
| Chassis Code | E30 |
| Ride-Height Adjustable | Yes |
| Damping Adjustment | 1-Way |
| Adjustable Droplinks Available - Front | No |
| Adjustable Droplinks Available - Rear | No |
| Adjustable Droplinks Required - Front | No |
| Adjustable Droplinks Required - Rear | No |
| DDP Pistons Available | Yes |
| DDP Pistons Included | No |
| DLC Coated Shafts Available | Yes |
| DLC Coated Shafts Included | No |
| Optional 1 Top Mounts - Front | TMA-B02-A1-20F - Camber Adjustable |
| Optional 2 Top Mounts - Front | Not Available |
| Optional Top Mounts - Rear | TMA-B01-B1-30R - Solid Top Mounts (no camber adjustment) |
| QDC Included | No |
| Ratio - Front | 70% |
| Ratio - Rear | 30% |
| Strut/Shock Type - Rear | Eye 2 Pin Strut |
| Spring Kit Include | Yes |
| Strut/Shock Type - Front | Uses OEM Spindles |
| Quantity | Full Set (Front & Rear) |
| Notes | Works with OE top mounts. Original front spindles needed before start of production. |
Vehicle Fitment
- 1985 BMW 3 Series 325i RWD (E30)
- 1986 BMW 3 Series 325i RWD (E30)
- 1987 BMW 3 Series 325i RWD (E30)
- 1988 BMW 3 Series 325i RWD (E30)
- 1989 BMW 3 Series 325i RWD (E30)
- 1990 BMW 3 Series 325i RWD (E30)
- 1991 BMW 3 Series 325i RWD (E30)