The world’s foremost automotive brands put their confidence in quality of Bilstein products. Why? Because Bilstein develops and series-produces suspension components in collaboration with its partners from the automotive industry. You’ll be opting for the Bilstein driving experience when you exchange your suspension components.
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.
BILSTEIN´s mono-tube technology
The original and best: The original mono-tube gas pressure shock absorbers bore the BILSTEIN name, and the manufacturer is 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).
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.
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 BILSTEIN's test engineers determine what the perfect lowering height should be. During this process, aerodynamics, residual spring travel, driving characteristics, comfort, suitability for everyday use, behavior in limited applications, and aesthetics are considered. This gives rise to BILSTEIN's three tenets of lowering.
Wedge-shaped suspensions involve lowering of approx. 60 mm at the front axle and approx. 40 mm at the rear axle. This creates a sporty appearancewhich packs a huge visual punch.
Wedge-shaped suspensions involve lowering of approx. 60 mm at the front axle and approx. 40 mm at the rear axle. This creates a sporty appearance which packs a huge visual punch.
With uniform lowering, the entire vehicle is lowered by approx. 30 mm. This accentuates the sporty appearance and emphasizes the driving dynamics, without compromising on comfort and/or spring travel.
Just as no two vehicles are the same, each driver has their own unique style too. As a result, BILSTEIN's threaded ride height adjustable kits even enable you to alter the height of your vehicle when they are installed.
Just as no two vehicles are the same, each driver has their own unique style too. As a result, our threaded ride height adjustable kits even enable you to alter the height of your vehicle when they are installed.
BILSTEIN's 3-layer coating system, developed especially with threaded ride height adjustable kits in mind, guarantees high-quality, enduring corrosion protection.
Take the children to school in the morning, go to the shops in convenience and comfort in the afternoon – and get the most out of every curve in the road in between. For drivers who don’t want to compromise on comfort or sportiness, the engineers have developed the perfect technology.
To achieve that celebrated BILSTEIN driving experience, BILSTEIN engineers rely on not only technology that is truly at the cutting edge, but also something that has withstood the test of time: how it feels to the driver. As a result, all of BILSTEIN's high-performance absorbers, as well as its sport suspensions and threaded ride height adjustable kits, undergo a rigorous testing program.
On the Nürburgring and in BILSTEIN's own test center at the Papenburg test track, the drivers test how balanced the driving characteristics of various vehicles are in a variety of different driving situations. Only when they have passed this program of tests, they are allowed to bear the BILSTEIN name. This way, the manufacturer can guarantee that celebrated BILSTEIN driving experience.
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), stabilizers, axle supports/wheel supports, wheel bearings, suspension arms (control arms and pull rods), wheel brakes, rims, tires, 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, brakes, 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 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 stabilizer, the tires 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 120oC 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 leveled 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.
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 optimize 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.