Sporty handling combined with outstanding looks. With factory pre-configured damping.
Composite collar for height adjustment
KW uses a threaded ring made of a resistant polyamide composite material with a stainless steel insert. Even if dirt particles such as brake dust or sand grains hit the polyamide collar will not be damaged. If anodized aluminum spring perchs are used after repeated lowering adjustment friction of any contamination may cause microcracks on the anodized surface. If the unprotected aluminum threaded ring directly touches the steel or stainless-steel strut thread oxidation will occur. In the worst case, height adjustmant will now not be possible anymore. With the durable KW coilovers in inox-line and the used polyamide collar, this is not the case.
The KW coilover kit Variant 1 "inox-line" is KW entry model for more driving pleasure with an attractive and individually adjustable lowering. Due to its high-quality finish, the use of struts made from stainless steel, corrosion resistant springs and bump stops as well as compatible components stands for long driving pleasure - not just the car's life.
Continuous lowering
With the KW coilover Variant 1 you can achieve maximum lowering in the tested adjustment range. Depending on vehicle model this varies between 30 to 70mm or 50 to 90mm. Even after years you can adjust the height quickly and easily due to the dirt resistant trapezoid thread and composite collar. Lowering at the front axle is made using KW one piece composite height adjuster, on the rear axle this is the same unless the car has a seperate spring and shock absorber. The supplied rear height adjuster sits either above or below the rear spring.
The benchmark for tuning fans
KW coilover Variant 1 "inox-line" satisfies the sporty driver with its harmonic basic setup. KW engineers develop for each vehicle a specific damper setup and spring rate to increase the driving pleasure with optimal balance of sportiness and practicality. In the end, you don't buy any coilover, but a KW coilover which has been developed specifically for your type of vehicle. KW as a manufacturer uses only its own resources, high quality components and the same damper technology as high-volume manufacturers. With the KW coilovers Variant 1 "inox-line", rolling motions of the body will be reduced during compression and you benefit from genuine directness and sportier handling while driving.
Trust In KW Experience
KW are the market leader and innovator of individual suspension solutions for road and racetrack for more than 15 years. No matter where in the world, car driver, automotive manufacturers and tuners rely on KW coilovers "Made in Germany". Each KW coilover kit, developed and manufactured in the Swabian town Fichtenberg, is subject to extensive stress tests during production to meet the high standards of KW quality management. Of course, KW give as a German manufacturer a 2-year warranty on KW more than 4600 applications suspension solutions, which exceed OEM quality. The warranty will increase up to 5 years when the kit has been installed at one of KW specialist dealers.
KW-Edelstahl-Federbein
A KW coilover with its 100 percent corrosion resistant stainless steel strut housings can be height adjusted at all times. With KW dirt resistant trapezoid thread and durable composite height adjuster collar adjustment is possible after many years of driving pleasure.
The polyamid composite collar:
In contrast to anodized adjustable spring seats made of aluminum, KW use a durable polyamid composite collar with a stainless steel insert. So even with the influence from dirt particles, such as brake dust or sand grains, the polyamide composite collar will not be damaged.
Lowering to your demand and high quality components for a long life
Unlike traditional standard- and sports suspension solutions, KW coilovers have an adjustable spring seat. This allows lowering via a trapezoid thread.
Another difference to the conventional series strut is the longer suspension travel, this is achieved by using shortened coilover strut housings.
Therefore even at maximum lowering the remaining spring travel is not affected.
Continuous lowering
The lowering of a KW coilover kit has to be adjusted at the front axle directly at tje 100 percent corrosion-resistant KW stainless steel strut after the McPherson method of construction while the kit is installed. Through the dirt-resistant trapezoid thread and the long life polyamid collar, the adjustment is easy to make, even after years.
With the adjustment technology used by KW that works even under spring preload. Depending on the vehicle type, the level control of the lowering at the rear axle occurs either directly at the strut after McPherson method of construction (for example Subaru Impreza); or via the KW rear axle height adjustment which is made of polyamid, at the spring retainer. Also here, the lowering can be adjusted via the coilover spring perche quick and easy when the kit is installed.
KW dampers and KW springs
A coordinated unit for a sporty driving experience. High-quality components, a vehicle-specific damper manufacturing and damper setup as well as many years of experience in development of suspension kits for the international motor sport is what the KW damper technology characterizes.
The KW coilovers for road vehicles are built after the successful twin-tube damping principle which is also often used for active regulation series suspensions. At twin-tube dampers, the piston housing (inner tube, also called rebound housing) and the differential housing (outer tube) are put together.
Spring perch
The KW spring perch is a completely underrated component. It not only holds the helper spring and main spring at the right position, but it also minimizes the vibration noise of the springs. Depending on the vehicle type and application, KW manufactures the spring perch of high quality aluminum alloy or a polyamide composite material. Whether made of aluminum or the composite material which is also rust resistant, the spring perch which is painted in the typical KW purple is very light weight.
Helper spring
The so-called helper spring is made of high quality chrome silicon steel in flat wire design. It keeps the main spring above the polyamide spring perch under tension, no matter what level of lowering. As soon as the weight of the vehicle presses on the helper spring, all windings are pressed together - the spring "goes on block".
Polyamide intermediate ring
The intermediate rings made of a light poyamide composite material used by KW not only hold the springs, but also minimize the vibration noise of the springs. Furthermore they isolate the rolling noices of the body.
Bump stop with integrated dust protection system
The dust cover prevents water and dirt particles reaching the piston rod seal package. Depending on the manufacturer, the dust cover is made of elastomer plastic and also serves as a passive suspension element.
High strength main spring
The high-strength spring made of chrome-silicon steel is vehicle specific adjusted in the respective suspension damper in its spring rate for long life it is multicoated. It is also called the main spring at coilovers. With brands such as KW, the spring "sits" after years just minimally.
Suspension spring
Not only the damper or vibration shock absorber of a KW coilover kit affects the springing behaviour but also the KW spring does. The resulting kinetic energy is stored by the spring during compression and converted into heat energy from the damper.
The spring rate tells the amount of force (N) that has to act to the spring, so that it immerses by a millimeter. Simply explained: the higher the spring rate, the stiffer the spring, and the more force must act on the spring to compress it
Linear spring rate
If a suspension spring is winded linear, the force increases in direct proportion to the compression travel. A spring rate of 70 Newton (N)/mm means that 70 N must act on the spring to compress it by one millimeter.
Progressive spring rate
At a progressive spring rate, the suspension spring consits of differently strong spring windings. When a force acts, the weak windings give up at first and then the stronger spring windings. The same effect can also be achieved by the use of two springs placed on top of each other.
Composite collar for height adjustment
KW uses a threaded ring made of a resistant polyamide composite material with a stainless steel insert. Even if dirt particles such as brake dust or sand grains hit the polyamide collar will not be damaged. If anodized aluminum spring perchs are used after repeated lowering adjustment friction of any contamination may cause microcracks on the anodized surface. If the unprotected aluminum threaded ring directly touches the steel or stainless-steel strut thread oxidation will occur. In the worst case, height adjustmant will now not be possible anymore. With the durable KW coilovers in inox-line and the used polyamide collar, this is not the case.
Stainless steel "inox-line" strut housing with integrated shock absorber
The strut housing of KW coilovers are made of high quality stainless steel and are an investment for the entire life of the car. At all weather conditions, the stainless steel KW coilovers are 100 percent corrosion resistant and have an unlimited life.
The functioning of lowering via the dirt-resistant trapezoid thread and the composite collar is designed for long use. During a salt spray test, there was no oxidation of the KW coilover struts. So even after years, the lowering is not
KW damping technology in detail
Function of KW twin-tube dampers
When a car deflects when driving, the oil which is lightly under pressure, will be displaced by the immersion of the piston rod. It flows into the outer tube through the bottom valve (compression valve) which controls the flow speed. During rebound, the oil flows from the outer tube back into the inner tube. In addition to the channels in the bottom valve, the oil also has to flow through the rebound valve located at the piston rod, to get into the piston housing.
The damper of a suspension kit converts the kinetic energy of the suspension spring into heat energy and passes it into the environment. When driving a curve, the KW coilover kit works in the curve inside of the vehicle in rebound and in the curve outside in compression damping.
What does the rebound have influence on?
The rebound damping directly affects the operating speed of the piston rod rebound springing and the expansion rate of the suspension spring. So it also determines how fast the suspension spring is expanded back in their original position. At the KW coilovers Variant 2 and 3, the driver can adjust the rebound via 16 precise clicks. So the diameter of the rebound valves will be opened for a softer driving behaviour and closed for a tighter setup. With the adjustable rebound of the KW coilovers, the vehicle handling and comfort can be influenced.
What does the compression damping affect?
At the KW coilovers Variant 3 it is also possible to adjust the basic setup of the bottom valve via the compression adjustment in twelve precise clicks. With the compression damping, the speed of the piston rod during immersion is controlled. It has a direct impact on the body movements and the steering behaviour. When the compression valves are opened, the compression damping will be reduced and the vehicle immerses faster when steering. When the compression damping is incresed, the piston rod immerses slower and the vehicle acts more stable when steering. The steering behaviour gets more precise, the stronger the compression damping is adjusted.
KW "inox-line" in detail and the salt spray test
How resistant to rust are the KW coilovers "inox line"? We hear from KW satisfied customers daily. But we wanted to know it more precisely and therefore we worked together with the Fachhochschule (University of Applied Sciences) Esslingen. The chemists and engineers of the FH tested the KW coilover struts made of stainless steel. So in total nine coilover struts from six different manufacturers went through a quality check.
For more stability and driving comfort. With adjustable rebound damping.
Drivers who want more than just an outstanding look and lowering within the tested adjustment range, will find the perfect suspension solution with our KW coilovers Variant 2 "inox-line". Not only stainless steel struts, corrosion-resistant components great durability, you have the possiblity to adjust the dampers to your own requirements in rebound (16 clicks) are good reasons to buy KW coilovers Variant 2 "inox-line".
More comfort or more sportiness - you decide!
As with all KW coilovers our engineers develop vehicle specific damper settings which undergo comprehensive test cycles in the Nürburgring Nordschleife and on our KW 7-post driving dynamic centre. With a KW coilover kit the driving experience is more dynamic and direct. Because of the rebound adjustablility with our KW Variant 2 coilovers you can have more influence in handling and comfort of the car. With 16 precise click you can adjust the KW dampers (firmer or more comfortable) without affecting the bottom vlave of the compression damping.
Depending on vehicle type, the rebound valves of the KW twin-tube dampers have to be adjusted at the upper end of the piston rod with an integrated adjustment wheel or the twist-adjuster which is part of the delivery content. By increasing the rebound force via the adjustment wheel, the body movements are reduced. Your car will stay in line and you will have more stability at increased corner speed. If you change for example the wheel / tire combination (approved by the car manufacturer) to larger wheels, then with a KW coilover Variant 2 you will be able to adjust the car's handling and the new wheels perfectly to each other.
KW Quality - Your satisfaction is our motivation
At our headquarters in Fichtenberg each KW coilover Variant 2 "inox-line" kit is subject to extensive stress tests during production to meet the high standards of our KW quality management. Every single damper and suspension kit is tested thoroughly. Of course, we give as a German manufacturer a 2-year warranty on our more than 4600 applications suspension solutions, which exceed OEM quality. The warranty will increase up to 5 years when the kit has been installed at one of our KW specialist dealers.
KW coilover struts are 100% rust-free and have an unlimited life time under all weather conditions. All parts are designed for long term use. After a salt spray test the KW coilover struts were free of oxidation. Even after years the height adjustment will not be affected.
You have 16 clicks of adjustments with a KW coilover Variant 2 "inox-line". The rebound adjustment changes the driving dynamics if the change the complete wheel set or install a set of winter tires. You can adjust the damping characteristics of the weather-resistant KW coilover 2 "inox-line" to be firmer or more comfortable, according to your own needs. The suspension is suitable for all competitive drivers who want more than just continous lowering for their driving pleasure.
Rebound damping on front axle Rebound damping on rear axle
The vibration of the wheels, axles and chassis are reduced with the use of a "shock absorber". Therefore it would be technically correct to call the "shock absorber" a "vibration dampener". When driving over irregularities, the acting shock is absorbed by
Vibration arises from the spring wanting to give up its stored energy through a sequence of repetitive movement.
These movements are transmitted via the piston rod to the shock absorber. Here, the kinetic energy is converted to heat by hydraulic resistance in the shock absorber valve. The vibrations are reduced to an inaudible minimum.
An intact shock absorber offer:
KW's adjustable dampening technology is offered for a wide selection of applications and vehicle class categories.
How a KW twin-tube shock absorber functions
When the chassis moves while driving, the oil which is lightly pressurized will be displaced by the immersion of the piston rod within the damper. The oil flows into the outer tube through the bottom valve (compression valve) which controls the flow speed
The dampers of a suspension kit converts the kinetic energy of the suspension movement into heat energy and passes it into the environment. While driving a curve in the road, the KW coilover kit functions within the vehicle providing rebound and compression
Rebound adjustment by an allen key Rebound adjustment by attachable Rebound adjustment by integrated adjustment knob, when space allows adjustment wheel
Oil flow during "hard" rebound stroke Bypass orifice with closed adjuster position. Digressive damping characteristic and the maximum achievable rebound damping. Damping is determined by the setup specific preload of the valve spring at the piston. The result: A firm but not a hard rebound stroke adjustment avoids rolling- and pitching motions.
Oil flow during "soft" rebound stroke Bypass orifice with open adjuster position. Progressive damping characteristic and the minimum possible rebound damping is achieved. The bypass oil volume (black arrows) is not available anymore for the spring preloaded valve at the piston and the damping The result: A lower rebound damping increases the driving comfort. Graphic representation of the relation from damper speed (m/s) to damping force (N) when adjusting the rebound damping.
12-way adjustable compression damping with a denounced click feature
The KW Variant 3 and KW Clubsport coilovers are the ideal system for performance orientated driving enthusiasts who value an a wide range of dampening adjustment for their vehicles.
The adjustable independent rebound and compression damping provides an extensive range of damper tuning. This provides the enthusiast to directly effect the turn-in characteristics, tracking stability, trip grip and handling at the vehicle's limits.
The patented KW valve technology for independent rebound and compression damping allows the user to customize their KW damper setup.
Our modular sealing system exceeds OEM standards. It can be opened easily and allows customized adjustments of the valve technology or rod / piston stroke by an aluminium nut
KW-Edelstahl-Federbein
A KW coilover with its 100 percent corrosion resistant stainless steel strut housings can be height adjusted at all times. With KW dirt resistant trapezoid thread and durable composite height adjuster collar adjustment is possible after many years of driving pleasure.
The polyamid composite collar:
In contrast to anodized adjustable spring seats made of aluminum, KW use a durable polyamid composite collar with a stainless steel insert. So even with the influence from dirt particles, such as brake dust or sand grains, the polyamide composite collar will not be damaged.
Lowering to your demand and high quality components for a long life
Unlike traditional standard- and sports suspension solutions, KW coilovers have an adjustable spring seat. This allows lowering via a trapezoid thread.
Another difference to the conventional series strut is the longer suspension travel, this is achieved by using shortened coilover strut housings.
Therefore even at maximum lowering the remaining spring travel is not affected.
Continuous lowering
The lowering of a KW coilover kit has to be adjusted at the front axle directly at tje 100 percent corrosion-resistant KW stainless steel strut after the McPherson method of construction while the kit is installed. Through the dirt-resistant trapezoid thread and the long life polyamid collar, the adjustment is easy to make, even after years.
With the adjustment technology used by KW that works even under spring preload. Depending on the vehicle type, the level control of the lowering at the rear axle occurs either directly at the strut after McPherson method of construction (for example Subaru Impreza); or via the KW rear axle height adjustment which is made of polyamid, at the spring retainer. Also here, the lowering can be adjusted via the coilover spring perche quick and easy when the kit is installed.
KW dampers and KW springs
A coordinated unit for a sporty driving experience. High-quality components, a vehicle-specific damper manufacturing and damper setup as well as many years of experience in development of suspension kits for the international motor sport is what the KW damper technology characterizes.
The KW coilovers for road vehicles are built after the successful twin-tube damping principle which is also often used for active regulation series suspensions. At twin-tube dampers, the piston housing (inner tube, also called rebound housing) and the differential housing (outer tube) are put together.
Spring perch
The KW spring perch is a completely underrated component. It not only holds the helper spring and main spring at the right position, but it also minimizes the vibration noise of the springs. Depending on the vehicle type and application, KW manufactures the spring perch of high quality aluminum alloy or a polyamide composite material. Whether made of aluminum or the composite material which is also rust resistant, the spring perch which is painted in the typical KW purple is very light weight.
Helper spring
The so-called helper spring is made of high quality chrome silicon steel in flat wire design. It keeps the main spring above the polyamide spring perch under tension, no matter what level of lowering. As soon as the weight of the vehicle presses on the helper spring, all windings are pressed together - the spring "goes on block".
Polyamide intermediate ring
The intermediate rings made of a light poyamide composite material used by KW not only hold the springs, but also minimize the vibration noise of the springs. Furthermore they isolate the rolling noices of the body.
Bump stop with integrated dust protection system
The dust cover prevents water and dirt particles reaching the piston rod seal package. Depending on the manufacturer, the dust cover is made of elastomer plastic and also serves as a passive suspension element.
High strength main spring
The high-strength spring made of chrome-silicon steel is vehicle specific adjusted in the respective suspension damper in its spring rate for long life it is multicoated. It is also called the main spring at coilovers. With brands such as KW, the spring "sits" after years just minimally.
Suspension spring
Not only the damper or vibration shock absorber of a KW coilover kit affects the springing behaviour but also the KW spring does. The resulting kinetic energy is stored by the spring during compression and converted into heat energy from the damper.
The spring rate tells the amount of force (N) that has to act to the spring, so that it immerses by a millimeter. Simply explained: the higher the spring rate, the stiffer the spring, and the more force must act on the spring to compress it
Linear spring rate
If a suspension spring is winded linear, the force increases in direct proportion to the compression travel. A spring rate of 70 Newton (N)/mm means that 70 N must act on the spring to compress it by one millimeter.
Progressive spring rate
At a progressive spring rate, the suspension spring consits of differently strong spring windings. When a force acts, the weak windings give up at first and then the stronger spring windings. The same effect can also be achieved by the use of two springs placed on top of each other.
Composite collar for height adjustment
KW uses a threaded ring made of a resistant polyamide composite material with a stainless steel insert. Even if dirt particles such as brake dust or sand grains hit the polyamide collar will not be damaged. If anodized aluminum spring perchs are used after repeated lowering adjustment friction of any contamination may cause microcracks on the anodized surface. If the unprotected aluminum threaded ring directly touches the steel or stainless-steel strut thread oxidation will occur. In the worst case, height adjustmant will now not be possible anymore. With the durable KW coilovers in inox-line and the used polyamide collar, this is not the case.
Stainless steel "inox-line" strut housing with integrated shock absorber
The strut housing of KW coilovers are made of high quality stainless steel and are an investment for the entire life of the car. At all weather conditions, the stainless steel KW coilovers are 100 percent corrosion resistant and have an unlimited life.
The functioning of lowering via the dirt-resistant trapezoid thread and the composite collar is designed for long use. During a salt spray test, there was no oxidation of the KW coilover struts. So even after years, the lowering is not
KW damping technology in detail
Function of KW twin-tube dampers
When a car deflects when driving, the oil which is lightly under pressure, will be displaced by the immersion of the piston rod. It flows into the outer tube through the bottom valve (compression valve) which controls the flow speed. During rebound, the oil flows from the outer tube back into the inner tube. In addition to the channels in the bottom valve, the oil also has to flow through the rebound valve located at the piston rod, to get into the piston housing.
The damper of a suspension kit converts the kinetic energy of the suspension spring into heat energy and passes it into the environment. When driving a curve, the KW coilover kit works in the curve inside of the vehicle in rebound and in the curve outside in compression damping.
What does the rebound have influence on?
The rebound damping directly affects the operating speed of the piston rod rebound springing and the expansion rate of the suspension spring. So it also determines how fast the suspension spring is expanded back in their original position. At the KW coilovers Variant 2 and 3, the driver can adjust the rebound via 16 precise clicks. So the diameter of the rebound valves will be opened for a softer driving behaviour and closed for a tighter setup. With the adjustable rebound of the KW coilovers, the vehicle handling and comfort can be influenced.
What does the compression damping affect?
At the KW coilovers Variant 3 it is also possible to adjust the basic setup of the bottom valve via the compression adjustment in twelve precise clicks. With the compression damping, the speed of the piston rod during immersion is controlled. It has a direct impact on the body movements and the steering behaviour. When the compression valves are opened, the compression damping will be reduced and the vehicle immerses faster when steering. When the compression damping is incresed, the piston rod immerses slower and the vehicle acts more stable when steering. The steering behaviour gets more precise, the stronger the compression damping is adjusted.
How resistant to rust are the KW coilovers "inox line"? We hear from KW satisfied customers daily. But we wanted to know it more precisely and therefore we worked together with the Fachhochschule (University of Applied Sciences) Esslingen. The chemists and engineers of the FH tested the KW coilover struts made of stainless steel. So in total nine coilover struts from six different manufacturers went through a quality check.
Unlimited individuality for performance & comfort.
Damping forces can be adjustment separately in rebound & compression.
Our engineers have developed a sporty yet harmonious basic setup, as with any KW coilover kit. To be able to guarantee the perfect suspension setup we test on our KW 7-post rig, as well as extensive driving tests on country roads, motorways and even on the Nürburgring Nordschleife. For years, the KW coilover kit Variant 3 "inox-line" is one of the top aftermarket products and is a benchmark for coilovers. It convinces sports car drivers, tuner, large-and small series manufacturer such as Alpina, MTM, Manthey, Oettinger and many more leading companies in the international automotive industry with its damping characteristics, quality finish and durability.
Advanced technology from motor sport
With the KW coilovers Variant 3 "inox-line" you will get much more than just a sporty lowering and excellent driving behaviour on all roads. It is based on our long experience as a suspension manufacturer and supplier for international motor sport, such as the touring car series ADAC GT Masters, FIA GT1, FIA GT3, International GT Open, WTC, VLN and the legendary ADAC Zurich 24h-race Nürburgring.
Similar to our racing coilovers from the KW Competition program, the KW coilovers Variant 3 "inox-line" can be adjusted independently in compression and rebound damping. This individual adjustment possibility is much appreciated by sports car manufacturers, tuners and drivers worldwide.
The perfect suspension setup for more driving pleasure
If you have already made your first performance modifications to your vehicle our KW coilovers Variant 3 will compliment your upgrades. The patented KW-valve technology for separate adjustment of rebound and compression damping allows you to individually setup your suspension.The adjustable KW bottom valve adjusts the low-speed range of the compression level in twelve clicks.
You don’t need any adjusting tools because of the patented compression adjuster at the lower end of the stainless steel housing. The adjustable compression damping with its twelve exact clicks allows you to manually influence body roll, without having to change the spring rate which optimally matches the rebound.
With the individually adjustable rebound setup of the KW coilover Variant 3 "inox-line", you can directly influence the handling and comfort with its precise click adjustment. Depending on the vehicle type, the rebound valves of the KW twin-tube dampers on the upper end of the piston rod will be adjusted via an integrated adjustment wheel or a twist-adjustment wheel which is included in the delivery content.
By increasing the rebound force via the adjustment wheel body movements are reduced. You will have more stability during high speed cornering. If you change for example the wheel / tire combination (approved by the car manufacturer) to larger wheels, then with a KW coilover Variant 3 "inox-line" you will be able to adjust the car's handling perfectly.
High quality, individual and durable
The KW coilover Variant 3 "inox-line" kit and every single damper are subject to extensive quality tests during production to meet the high standards of our KW quality management. This is the only way we can meet our expectations to give up to five years warranty on our KW coilover Variant 3 "inox-line" when installed at one of our KW specialist dealer. KW coilover struts made of stainless steel are 100% rust-free and an unlimited life time.
Therefore the operation of the continuous lowering via the dirt-resistant KW trapezoid thread and the KW composite collar is also not affected after years. By the individual lowering with its continuous adjustment range, you can emphasize the sportiness of your vehicle visually. A feature that is very popular in the performance-oriented tuning scene.
The KW coilover kit Variant 3 "inox-line" is the perfect accessory for performance-oriented drivers and tuning enthusiasts who put a great demand on their suspension. The separately rebound and compression damping adjustable dampers with their "well-thought-through" click adjustment allow a perfect setup. So it is easy to influence the steering behaviour, directional stability, tire grip and handling characteristics when driving on the limit.
Rebound damping on front axle Rebound damping on rear axle
Damper Basics - The function of a shock absorber
The vibration of the wheels, axles and chassis are reduced with the use of a "shock absorber". Therefore it would be technically correct to call the "shock absorber" a "vibration dampener". When driving over irregularities, the acting shock is absorbed by
Vibration arises from the spring wanting to give up its stored energy through a sequence of repetitive movement.
These movements are transmitted via the piston rod to the shock absorber. Here, the kinetic energy is converted to heat by hydraulic resistance in the shock absorber valve. The vibrations are reduced to an inaudible minimum.
An intact shock absorber offer:
KW's adjustable dampening technology is offered for a wide selection of applications and vehicle class categories.
How a KW twin-tube shock absorber functions
When the chassis moves while driving, the oil which is lightly pressurized will be displaced by the immersion of the piston rod within the damper. The oil flows into the outer tube through the bottom valve (compression valve) which controls the flow speed
The dampers of a suspension kit converts the kinetic energy of the suspension movement into heat energy and passes it into the environment. While driving a curve in the road, the KW coilover kit functions within the vehicle providing rebound and compression
Rebound adjustment by an allen key Rebound adjustment by attachable Rebound adjustment by integrated adjustment knob, when space allows adjustment wheel
Oil flow during "hard" rebound stroke Bypass orifice with closed adjuster position. Digressive damping characteristic and the maximum achievable rebound damping. Damping is determined by the setup specific preload of the valve spring at the piston. The result: A firm but not a hard rebound stroke adjustment avoids rolling- and pitching motions.
Oil flow during "soft" rebound stroke Bypass orifice with open adjuster position. Progressive damping characteristic and the minimum possible rebound damping is achieved. The bypass oil volume (black arrows) is not available anymore for the spring preloaded valve at the piston and the damping The result: A lower rebound damping increases the driving comfort. Graphic representation of the relation from damper speed (m/s) to damping force (N) when adjusting the rebound damping.
12-way adjustable compression damping with a denounced click feature
The KW Variant 3 and KW Clubsport coilovers are the ideal system for performance orientated driving enthusiasts who value an a wide range of dampening adjustment for their vehicles.
The adjustable independent rebound and compression damping provides an extensive range of damper tuning. This provides the enthusiast to directly effect the turn-in characteristics, tracking stability, trip grip and handling at the vehicle's limits.
The patented KW valve technology for independent rebound and compression damping allows the user to customize their KW damper setup.
Our modular sealing system exceeds OEM standards. It can be opened easily and allows customized adjustments of the valve technology or rod / piston stroke by an aluminium nut
KW-Edelstahl-Federbein
A KW coilover with its 100 percent corrosion resistant stainless steel strut housings can be height adjusted at all times. With KW dirt resistant trapezoid thread and durable composite height adjuster collar adjustment is possible after many years of driving pleasure.
The polyamid composite collar:
In contrast to anodized adjustable spring seats made of aluminum, KW use a durable polyamid composite collar with a stainless steel insert. So even with the influence from dirt particles, such as brake dust or sand grains, the polyamide composite collar will not be damaged.
Lowering to your demand and high quality components for a long life
Unlike traditional standard- and sports suspension solutions, KW coilovers have an adjustable spring seat. This allows lowering via a trapezoid thread.
Another difference to the conventional series strut is the longer suspension travel, this is achieved by using shortened coilover strut housings.
Therefore even at maximum lowering the remaining spring travel is not affected.
Continuous lowering
The lowering of a KW coilover kit has to be adjusted at the front axle directly at tje 100 percent corrosion-resistant KW stainless steel strut after the McPherson method of construction while the kit is installed. Through the dirt-resistant trapezoid thread and the long life polyamid collar, the adjustment is easy to make, even after years.
With the adjustment technology used by KW that works even under spring preload. Depending on the vehicle type, the level control of the lowering at the rear axle occurs either directly at the strut after McPherson method of construction (for example Subaru Impreza); or via the KW rear axle height adjustment which is made of polyamid, at the spring retainer. Also here, the lowering can be adjusted via the coilover spring perche quick and easy when the kit is installed.
KW dampers and KW springs
A coordinated unit for a sporty driving experience. High-quality components, a vehicle-specific damper manufacturing and damper setup as well as many years of experience in development of suspension kits for the international motor sport is what the KW damper technology characterizes.
The KW coilovers for road vehicles are built after the successful twin-tube damping principle which is also often used for active regulation series suspensions. At twin-tube dampers, the piston housing (inner tube, also called rebound housing) and the differential housing (outer tube) are put together.
Spring perch
The KW spring perch is a completely underrated component. It not only holds the helper spring and main spring at the right position, but it also minimizes the vibration noise of the springs. Depending on the vehicle type and application, KW manufactures the spring perch of high quality aluminum alloy or a polyamide composite material. Whether made of aluminum or the composite material which is also rust resistant, the spring perch which is painted in the typical KW purple is very light weight.
Helper spring
The so-called helper spring is made of high quality chrome silicon steel in flat wire design. It keeps the main spring above the polyamide spring perch under tension, no matter what level of lowering. As soon as the weight of the vehicle presses on the helper spring, all windings are pressed together - the spring "goes on block".
Polyamide intermediate ring
The intermediate rings made of a light poyamide composite material used by KW not only hold the springs, but also minimize the vibration noise of the springs. Furthermore they isolate the rolling noices of the body.
Bump stop with integrated dust protection system
The dust cover prevents water and dirt particles reaching the piston rod seal package. Depending on the manufacturer, the dust cover is made of elastomer plastic and also serves as a passive suspension element.
High strength main spring
The high-strength spring made of chrome-silicon steel is vehicle specific adjusted in the respective suspension damper in its spring rate for long life it is multicoated. It is also called the main spring at coilovers. With brands such as KW, the spring "sits" after years just minimally.
Suspension spring
Not only the damper or vibration shock absorber of a KW coilover kit affects the springing behaviour but also the KW spring does. The resulting kinetic energy is stored by the spring during compression and converted into heat energy from the damper.
The spring rate tells the amount of force (N) that has to act to the spring, so that it immerses by a millimeter. Simply explained: the higher the spring rate, the stiffer the spring, and the more force must act on the spring to compress it
Linear spring rate
If a suspension spring is winded linear, the force increases in direct proportion to the compression travel. A spring rate of 70 Newton (N)/mm means that 70 N must act on the spring to compress it by one millimeter.
Progressive spring rate
At a progressive spring rate, the suspension spring consits of differently strong spring windings. When a force acts, the weak windings give up at first and then the stronger spring windings. The same effect can also be achieved by the use of two springs placed on top of each other.
Composite collar for height adjustment
KW uses a threaded ring made of a resistant polyamide composite material with a stainless steel insert. Even if dirt particles such as brake dust or sand grains hit the polyamide collar will not be damaged. If anodized aluminum spring perchs are used after repeated lowering adjustment friction of any contamination may cause microcracks on the anodized surface. If the unprotected aluminum threaded ring directly touches the steel or stainless-steel strut thread oxidation will occur. In the worst case, height adjustmant will now not be possible anymore. With the durable KW coilovers in inox-line and the used polyamide collar, this is not the case.
Stainless steel "inox-line" strut housing with integrated shock absorber
The strut housing of KW coilovers are made of high quality stainless steel and are an investment for the entire life of the car. At all weather conditions, the stainless steel KW coilovers are 100 percent corrosion resistant and have an unlimited life.
The functioning of lowering via the dirt-resistant trapezoid thread and the composite collar is designed for long use. During a salt spray test, there was no oxidation of the KW coilover struts. So even after years, the lowering is not
KW damping technology in detail
Function of KW twin-tube dampers
When a car deflects when driving, the oil which is lightly under pressure, will be displaced by the immersion of the piston rod. It flows into the outer tube through the bottom valve (compression valve) which controls the flow speed. During rebound, the oil flows from the outer tube back into the inner tube. In addition to the channels in the bottom valve, the oil also has to flow through the rebound valve located at the piston rod, to get into the piston housing.
The damper of a suspension kit converts the kinetic energy of the suspension spring into heat energy and passes it into the environment. When driving a curve, the KW coilover kit works in the curve inside of the vehicle in rebound and in the curve outside in compression damping.
What does the rebound have influence on?
The rebound damping directly affects the operating speed of the piston rod rebound springing and the expansion rate of the suspension spring. So it also determines how fast the suspension spring is expanded back in their original position. At the KW coilovers Variant 2 and 3, the driver can adjust the rebound via 16 precise clicks. So the diameter of the rebound valves will be opened for a softer driving behaviour and closed for a tighter setup. With the adjustable rebound of the KW coilovers, the vehicle handling and comfort can be influenced.
What does the compression damping affect?
At the KW coilovers Variant 3 it is also possible to adjust the basic setup of the bottom valve via the compression adjustment in twelve precise clicks. With the compression damping, the speed of the piston rod during immersion is controlled. It has a direct impact on the body movements and the steering behaviour. When the compression valves are opened, the compression damping will be reduced and the vehicle immerses faster when steering. When the compression damping is incresed, the piston rod immerses slower and the vehicle acts more stable when steering. The steering behaviour gets more precise, the stronger the compression damping is adjusted.
How resistant to rust are the KW coilovers "inox line"? We hear from KW satisfied customers daily. But we wanted to know it more precisely and therefore we worked together with the Fachhochschule (University of Applied Sciences) Esslingen. The chemists and engineers of the FH tested the KW coilover struts made of stainless steel. So in total nine coilover struts from six different manufacturers went through a quality check.
Racing technology State of the art. Seperated adjustment for rebound & compression damping
Low- and Highspeed.
With the KW coilovers Variant 4, we combining leading racing technology with a clear plus in everyday practicality for top-class super sports cars, sports cars and performance sedans such as the Audi R8 (42), Audi RS6 (C7), BMW M5 (F10), Lamborghini Aventador LP 750-4 SV, Dodge Charger SRT Hellcat and Co. This allows an independent adjustment of the rebound damping as well as the low-speed and high-speed compression damping. KW provides the Variant 4 with a vehicle-specific comfort setting and the adjustable dampers can be set intuitively with the integrated adjustment wheel at the damper quickly to a performance setup, if required.
Developed exclusively for super sports cars
The KW coilover kit Variant 4 is manufactured depending on the vehicle-specific requirements in versions for McPherson suspension struts, spring struts for double cross-link or multi-link axles as well as push-rod wheel suspensions made of aluminum or stainless steel. The KW coilover kit Variant 4 is manufactured depending on the vehicle-specific requirements in versions for McPherson suspension struts, spring struts for double cross-link or multi-link axles as well as push-rod wheel suspensions made of aluminum or stainless steel. The Variant 4 is developed exclusively for super sports cars, sports cars and performance sedans and is already available for vehicles such as the Audi R8 (42), Audi RS6 (C7), BMW M5 (F10), Lamborghini Aventador LP 750-4 SV or Dodge Charger SRT Hellcat.
With 16 exact clicks, the rebound adjustment wheel allows to adjust the rebound damping forces for a tighter handling or more comfort.
For an even more individual driving behavior, the 3-way high-performance dampers can be adjusted independently of the rebound, also in the low-speed and high-speed compression damping, separately at the reservoir with six clicks in low-speed compression and 14 clicks in high-speed compression damping.
Review in the press
The engineers at BMW’s M division focussed their attentions on the chassis and weight reduction. The Stock springs and dampers have therefore been replaced by three-way adjustable coilovers, with 16 clicks for rebound, 14 clicks in high speed compression and six in low speed compression. On top of that there’s a 15mm window of adjustment for the ride height. … We first tried the GTS at Catalunya circuit, Spain, in BMW’s recommended track setting before driving it in the UK in the road setup. On circuit the M4 GTS is every bit as focussed and uncompromising as you’d hope it to be. Whereas the standard car can feel quite short of body control, particularly at the rear axle, the GTS corners flatly and feels superbly locked down with none of the unsettling vertical motions that characterise the base model. Its front axle responds instantaneously to steering inputs – incidentally the steering feels much more direct and communicative here than it does in the standard car – and it holds a line with real resilience and barely a trace of understeer. With more power and torque to distribute the rear axle is still easily overwhelmed, but, on track at least, the car is actually very fluid and languid in the way it moves from neutrality into oversteer – rather than being spikey and difficult to control. … the chassis upgrades give the GTS much of the precision and immediacy of a competition car. It feels a world apart from the standard M4. On the road you need to tread carefully around the Cup 2 tyres when they haven’t got heat in them but it is a truly thrilling machine. The road settings for the suspension don’t turn the GTS into a cosseting cruiser, but they soften things sufficiently to let it cope well with B-road bumps and although you’ll still find it distracted by cambers, you’re not left fighting the car. Perhaps more remarkably, it’s sufficiently habitable that you wouldn’t mind doing a decent motorway journey to reach a trackday, even if it was as far away as the Nurburgring.
Suspension is by KW Automotive and is manually adjustable through 15mm for ride height and myriad settings of high- and low-speed bump and rebound damping. The forged aluminium control arms are shared with the standard M4, but there are new rigid mountings and ball joints throughout the suspension and steering systems. BMW’s standard tyre is a Michelin Pilot Sport Cup 2 of 285 section on the driven rear axle. It only took seven laps of the Circuit de Catalunya to establish that this is a very special car. Not quite compelling enough to trade in your GT3 RS for, perhaps, but almost that good, in all sorts of ways: grip level, cornering balance, adjustability, handling precision, control feedback and ultimate driver reward. It’s very close to the Porsche for out-and-out lapping pace, too, and from where the current M4 started out, that’s quite some achievement.