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Bilstein Shocks

Posted in Technical

BilsteinHere at Tune-Tech we offer you nothing but the best; tried and tested on our personal cars. We have gone through the motions with other shock brands and nothing pleased Shaun Sing till we found BILSTEIN. It actually feels better than the OEM shocks, but do note, at one stage BMWs were fitted with this brand on the production line. BILSTEIN continues to be the best high performance shock available for your BMW. Almost all BMW tuners from Germany, such as Alpina, AC Schnitzer, Hartge, and others use specially valved BILSTEIN shocks.


We are able to supply and fit their full BMW range – golden oldies and the current shapes – standard or sport suspension.

  • Z3 & Z4
  • 1 series
  • 3 series (any generation)
  • 5 series (any generation)
  • 6 series and 7 series (depends on EDC / DAMPtronic – we will discuss this with you)
  • X3 , X5 and X6 (air suspension will be discussed here). Note: we can convert the air suspension to NON-AIR SUSPENSION… yes, yes we know the grief with this system.

EMAIL THE OFFICE WITH YOUR VIN NUMBER (found on license discs) and we will tell you what we can offer and send you quotes.

Their systems:

1. Gas Pressure Technology Gas Pressure Technology

Over time, the mono-tube gas pressure technology developed by BILSTEIN has established itself as a standard in automotive construction. This technology involves keeping the oil in the absorber under pressure, which prevents it from foaming when temperatures and loads are increasing. As a result, full damping power is retained even when the system is placed under extreme stress – a feature that can be observed in the self-lowering piston.

  • Ensures a high level of traction and more precise handling
  • A must-have for powerful sport suspensions
  • Added safety in all dynamic driving situations

Gas Pressure Technology Diagram

2. Mono- / Twin-Tube Technology

BILSTEIN´s mono-tube technology Mono-tube technology

The original and best: the original mono-tube gas pressure shock absorbers bore the BILSTEIN name, and we’re still responsible for producing the best there is. BILSTEIN’s mono-tube technology is the number-one choice in motorsports and series-production sports cars. No other type gives engineers the same freedom to choose the perfect installation location or position (e.g. upside-down technology).

  • Large effective surface on the working piston creates increased damping power and better handling
  • Improved dissipation of thermal energy outwards enables a consistently high level of absorber performance
  • Sturdy structure for added safety in upside-down technology


Twin-tube technology Twin-tube technology

The proven technology of a twin-tube absorber is applied in the vast majority of all vehicles. BILSTEIN‘s twin-tube absorbers, featuring “original equipment manufacturer” quality that has undergone rigorous testing, offer a marked improvement in driving characteristics with universal spare parts replaced in a timely and efficient manner.

  • Oil or gas pressure technology
  • Only tested, OEM quality is provided
  • A favourably priced alternative at the highest level
  • Technology transfer from series production


Example of systems:

M3 E46 kit
Example: M3 E46 kit

E60 Bilstein Sport Shocks

Example : E60 BILSTEIN Sport Shocks – E60 525i/530i/535i/545i/550i

B4’s standard suspension BMWs

B4’s standard suspension BMWs

BILSTEIN B6 Performance

If you’re looking to enhance the performance of your suspension system, the BILSTEIN B6 Performance series is the best solution to improve your car’s ride.  With unbelievable control, precise handling, and incredible comfort, you’ll soon discover there is, quite literally, nothing like it.

Features and Benefits:

  • Mono-tube gas pressure construction
  • Improved safety and sportiness
  • Added traction and enhanced stability
  • Increased durability and performance while maintaining ride comfort
  • Road-tested and fine-tuned by BILSTEIN for each vehicle specific application

BILSTEIN B8 Performance Plus

If you’re looking for a performance lowering shock absorber or strut, the BILSTEIN B8 Performance Plus is up to the task.  Designed to enhance your car’s lowered suspension, BILSTEIN’s mono-tube gas pressure technology delivers a sporty ride with remarkable comfort.

Features and Benefits:

  • Mono-tube gas pressure construction
  • High-performance shock absorbers and struts designed specifically for lowering springs and production sport vehicles
  • Sport-tuned with a high level of comfort
  • Precision handling and optimised vehicle control
  • Road-tested and fine-tuned by BILSTEIN

3. Lowering

  • lowering-60-40
  • lowering-30
  • lowering-30-50
  • lowering-20-tuv
  • lowering-10-30

When it comes to lowering, not only must the vehicle’s character be kept in mind, but the driver’s too. A multitude of tests involving a wide variety of equipment helps our test engineers determine what the perfect lowering height should be. During this process, we consider aerodynamics, residual spring travel, driving characteristics, comfort, suitability for everyday use, behaviour in limited applications, and aesthetics. This gives rise to our three tenets of lowering.

4. Basic Know-How

Basic suspension know-how made easy

Ever more powerful engines and faster cars mean that suspension systems have become a vital development aspect in the automotive industry. And these systems will play an increasingly important role in the future, because the chassis – particularly the springs and shock absorbers – provides the link between the wheel suspension and the car body, ensuring optimum contact with the road. Read on for a simple explanation of how it all works.

Suspension: road grip – traction – comfort

The suspension is the link between the road and the car body. The job of the suspension is to reduce – as far as possible in a controlled fashion – the vibrations from the wheel and the car body caused by an uneven road or changes of direction. Every attempt must be made to prevent these vibrations from being transmitted to the car body in order to reduce rocking, pitching and diving, avoid swaying, and ensure optimum road contact and traction with minimum slip. The suspension system comprises a range of components, including strut support bearings, springs, shock absorbers, connecting rods (coupling rods), stabilisers, axle supports/wheel supports, wheel bearings, suspension arms (control arms and pull rods), wheel brakes, rims, tyres, final drives and steering.

Springs and how they work

A spring cushions the effects of road unevenness and impacts from the road, turning these into vibrations. The spring forms an important link between the individual suspension components, connecting up the sprung and unsprung masses in the vehicle. The unsprung masses include the vehicle components situated between the road and the spring, i.e. the wheels, brake and parts of the wheel suspension and steering. All other vehicle components are classed as sprung masses and include the car body, drive train and the remaining parts of the wheel suspension and steering. In terms of a car’s suspension comfort, the basic rule is that the smaller the ratio of unsprung to sprung mass, the greater the comfort. The spring works in conjunction with the stabiliser, the tyres and the seats.

Shock absorbers and how they work

The shock absorbers reduce and slow down the vibrations from the springs, which is why technically they are correctly referred to as vibration dampers. Vibration dampers convert kinetic energy into thermal energy through fluid friction. This involves the flow of oil being slowed down by the valve passages inside the damper. The valve passages in the shock absorber are specifically designed to ensure that the vibrations transmitted by the spring are reduced right from the start. The shock absorbers can heat up to between 100 and 120°C in the process.

Interaction between spring and damper

When a car passes over an obstacle, this first has an impact on the spring, which must not be hampered by excessive damping performance on the part of the shock absorber. When a car passes over a bump in the road, for example, the obstacle forces the wheel up into the wheel housing. In the process, the spring is compressed. The shock absorber is now in its compression stage. Once the spring has levelled out the obstacle, the shock absorber has to slow down the movement of the spring as it releases its tension with great force. The shock absorber is now in its rebound stage. Compression stage (compressing of the springs and the damper, e.g. when driving over bumps in the road) = usually approx. 25% of the damping force. Rebound stage (when the spring pulls the damper apart) = usually approx. 75% of the damping force.

Conclusion: a spring with a higher spring rate (sport or lowered spring) will only work at its best in conjunction with the appropriate high-performance or sports shock absorber.

Further information about the different types of shock absorbers

Hydraulic shock absorbers

Nowadays, hydraulic shock absorbers are rarely used in today’s automotive industry. From a technical point of view, this type of damper is a poor solution, because the oil contains approximately 10% air. Under load, the air and oil molecules separate (foaming/cavitation), resulting in a noticeable drop in the damping force – on longer journeys on country roads and motorways, a loss of up to 35% damping force can be measured. That means the wheels provide poorer road holding; only after a break does the damper regain its full force and the vehicle its original driving performance.

Gas pressure shock absorbers

With gas pressure shock absorbers, this loss of damping force does not occur. The use of nitrogen ensures that the shock absorber oil is permanently under pressure, thereby preventing foaming, even under load. As a result, the driving performance of a car fitted with gas pressure shock absorbers can be precisely defined and remains reliably stable, whatever the situation; this constitutes a substantial bonus in terms of safety. Gas pressure shock absorbers are available with either mono- or twin-tube technology. The proven twin-tube system represents top-class technology at an attractive price. The mono-tube system, on the other hand, is the technology of choice in motor sports and on standard sports cars. The comparatively larger effective area of the working piston ensures greater damping force and better handling. Optimum discharge of thermal energy into the atmosphere means consistent high performance can be achieved and the sturdy design provides maximum safety reserves in flexible fitting conditions, e.g. inverted technology.

In general, the following applies:

If the vehicle is fitted with hydraulic shock absorbers as standard, switching to gas pressure shock absorbers (BILSTEIN B4) will optimise the driving stability, road holding, comfort and safety of any normal vehicle. Vehicles originally fitted with standard gas pressure shock absorbers only retain their driving performance if replacement gas pressure shock absorbers are fitted when the shocks are exchanged. Switching to mono-tube gas pressure shock absorbers (such as BILSTEIN B6) improves the vehicle’s overall driving performance and provides greater damping force, thereby improving safety and fun at the wheel, even under heavy load, for example, with high superstructures, gas units or when used with trailers.

5. Warranty


Thyssenkrupp BILSTEIN of America warrants its gas pressure shock absorbers against defects in workmanship and materials for as long as you, the original purchaser, own your car.

If a shock/strut malfunctions and BILSTEIN determines it to be defective, we will either replace it or repair it, depending on the term of the warranty based on the assembly’s model type.
Note: If your vehicle was equipped with BILSTEIN from the factory (original equipment), warranty claims must be directed to the vehicle manufacturer.


B4 OE Replacement / B6 / B6 Performance / B8 Performance Plus / B12 Series / B14 (PSS) / B16 (PSS9 & PSS10) / B6 4600 / B8 5100 / B8 5100 (Ride Height Adjustable) / B8 5112 / B8 6112

BILSTEIN warrants to the original retail purchaser that, for the life of each gas pressure shock, this product shall be free from defects in material and workmanship. Proof of purchase is required to process warranty. Please return product to the original place of purchase.


B4 OE Replacement (Air) / Steering Racks

BILSTEIN warrants to the original retail purchaser that, for a period of two (2) years from the date of purchase, the B4 OE Replacement (Air) suspension and Steering Racks shall be free from defects in workmanship and/or material. Proof of purchase is required to process warranty. Please return product to the original place of purchase.


B8 5125 / B8 5150 / B8 5160 / B8 5165 / M 7100 Series / B8 8125 / M 9100 Series / M 9300 Series / BILSTEIN Clubsport® / MOTORSPORTS PRODUCT

BILSTEIN warrants to the original retail purchaser that, for a period of ninety (90) days from the date of purchase, this product shall be free from defects in material and workmanship. Any implied warranty of merchantability, fitness or fitness for particular purpose, except as may be prohibited by applicable law, is likewise limited in duration to ninety (90) days from the date of original retail purchase. Some States do not allow limitations on how long an implied warranty lasts so the above limitation may not apply to you.

This warranty is non-transferable and does not cover normal wear and tear or any other loss, liability or damage resulting from improper alteration, disassembly, handling, installation, service, repair or use of this product. Should this product fail as a result of a defect in materials or workmanship within the warranty period, contact BILSTEIN’s Warranty Service Department by telephone at 1(800) 370-9522, or in writing at thyssenkrupp BILSTEIN of America 14102 Stowe Drive, Poway, California, 92064, for repair or replacement at Manufacturer’s option. Do not return this motorsports product to the place of purchase. Proof of purchase is required to process warranty.


The limited warranties set forth above do not cover normal wear and tear and are non-transferable. The following are warranty exclusions:

  • Original equipment shock absorbers (vehicle manufacturer warranty)
  • Improper installation
  • Racing, driving competition or off-road use
  • Modified use or other than BILSTEIN recommended vehicles
  • Commercial vehicles
  • Bent or broken rods showing abuse or abnormal wear

Surface finish, boot or mounting hardware such as, but not limited to, rubber bushings, as well as labor charges are not covered by any of the foregoing limited warranties. BILSTEIN’s liability for a defective shock absorber is limited to replacement of shock with a new or reconditioned BILSTEIN shock absorber. Repair or replacement as provided by this warranty is customer’s sole and exclusive remedy in the event of a product failure. Manufacturer shall not be liable for any incidental, consequential or other damages resulting from the disassembly, handling, installation, service, repair or use of this product. Some States do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from State to State.
Note: Other exclusions may or may not apply in certain states or rare circumstances.


1. Proof of purchase is required to process all warranties
2. If possible check the suspect shock/strut for possible failure using the directions listed below
3. If the shock/strut assembly qualifies as defective return it to your place of purchase accompanied by a copy of the proof of purchase. Include all contact information including a description of the problem/failure
Please note: unless otherwise instructed by BILSTEIN personnel, please return the product in question to your original place of purchase for warranty processing. If this is not possible, please download the Warranty Evaluation Form below and send directly to BILSTEIN. Download Warranty Evaluation Form (PDF) here.
For additional information about our warranty, please contact our Warranty Hotline by phone at 1(800) 370-9522 or email warranty@bilsteinUS.com.

FOR HISTORY: http://www.bilsteinus.com/about-bilstein/history/