Looking Back: Semi‑Active KW Suspension Technology in the RUF SCR

RUF SCR (2018) equipped with KW suspension in front of the RUF Automobile showroom
We also develop suspension systems for selected sports cars from RUF Automobile

Nearly 100 years of experience, passion, engineering expertise, and a deep love for the automobile within a family‑owned company and officially recognized as an automobile manufacturer for more than 40 years. Can it get any better?

RUF Automobile has been a successful low-volume automobile manufacturer for decades
RUF Automobile has been a successful low-volume automobile manufacturer for decades

Yes, it can. Because in the heart of Bavaria, they don’t build just any cars, they build sports cars. Handcrafted. By a small team of around 60 employees, all of whom put their heart and soul into what they do.

The best part is that not a single model is a no‑compromise race car or an over‑engineered horsepower machine. They are masterpieces. A RUF, quite simply. From the very beginning.

Unfiltered driving enjoyment, pure and simply overwhelming

At its core, a RUF is the quintessence of a classic Porsche 911, refined to the highest level of perfection. RUF has been doing this for quite some time. Back in the 1980s, RUF modified Porsche production bodyshells, put them on a strict lightweight diet using aluminum, and with vehicles such as the legendary RUF CTR “Yellowbird,” also known as the Group C Turbo RUF, rose to the pinnacle of the sports car world.

This is still the case today and in selected models such as the RUF CTR Anniversary, RUF CTR3 Evo, and RUF Tribute feature suspension technology from Fichtenberg.

At first glance, the RUF with its KW suspension looks timeless and elegant, much like a Porsche 911 from the 964 generation
What am I? A 964?

For the newly reissued RUF SCR presented here, we once again worked closely with the RUF development department. Because the RUF SCR is also a wolf in sheep’s clothing. At first glance, it appears timeless and elegant, reminiscent of a Porsche 911 from the 964 series. But that is where the similarities end. The SCR is wider, lower, shorter, lighter and much more besides.

4.0 liters of displacement, no turbocharger. The RUF six‑cylinder engine is a masterpiece
At just 5,760 rpm, the naturally aspirated boxer engine already delivers a peak torque of 470 Nm

So what is the absolute highlight of the SCR? In truth, every single component and it all starts with the engine. Mounted in the rear is a newly developed RUF flat‑six engine with individual throttle bodies and intake manifold fuel injection.

The current RUF SCR reaches a top speed of 320 km/h
The current RUF SCR reaches a top speed of 320 km/h

The six‑cylinder engine has a displacement of 4.0 liters, revs all the way up to 8,270 rpm, and delivers 510 hp (375 kW) to a ZF six‑speed manual transmission. From a standstill, the SCR accelerates to 100 km/h in just 3.4 seconds. After 11.9 seconds, it breaks through the 200 km/h barrier. All of this without a turbocharger and with a beautifully wide powerband that pulls strongly throughout the entire rev range, delivering its maximum torque of 470 Nm at 5,760 rpm. Outstanding.

The RUF SCR accelerates from 0 to 100 km/h in 3.4 seconds
0–100 km/h in 3.4 seconds—any questions?

The top speed of 320 km/h is, in our view, not a highlight but simply a factual figure. Because the SCR is not really at home on the Autobahn or on race tracks. Its territory lies on mountain passes or touring through the beautiful Bavarian Alpine foothills—but not only there.

Lightweight construction is technically prioritized above all else

Lightweight perfection the carbon monocoque of the current RUF SCR weighs just 80 kg.
Lightweight perfection—the carbon monocoque weighs only 80 kg

The reason the RUF SCR delivers so much driving enjoyment on any road and in any situation is not only the engine, but also its low overall weight. The SCR is essentially based on an 80‑kg carbon monocoque combined with an integrated lightweight steel safety cage.

In addition, the entire body structure including fenders, roof, side panels, and more is made from lightweight carbon fiber. Lightweight construction clearly takes top priority in the reissued RUF SCR, which is why the front and rear crash frame structures are also made from high‑strength lightweight steel.

The RUF SCR features pushrod suspension on both axles
Thanks to the pushrod suspension design, the dampers are mounted much closer to the vehicle center

The lightweight concept of the 1,250‑kilogram RUF SCR is further emphasized by its suspension design featuring double wishbones and pushrod actuation. Instead of MacPherson struts, the KW dampers and KW springs are mounted significantly more centrally in the vehicle, closer to the carbon monocoque and therefore closer to the vehicle’s center of gravity. A slender compression rod, the so‑called pushrod, transfers the vertical wheel movement via a rocker directly to the respective damper.

The RUF SCR uses pushrod suspension at the front axle and, as shown here, at the rear axle

The double wishbones are responsible exclusively for wheel control. This significantly reduces unsprung mass, allowing wheels, tires, brake discs, and wheel carriers to be lighter and to follow the road surface more precisely. To keep unsprung masses as low as possible, the SCR is equipped with a ceramic brake system. Lightweight 19‑inch center‑lock wheels further support the overall concept.

Controlled perfection in every situation

We also rely on the solid‑piston principle for selected KW DDC dampers
The DDC suspension system for the current RUF SCR also features solid‑piston dampers

The dampers are built according to our solid‑piston principle, which we also use in KW suspension systems such as KW V5, KW V5 Clubsport, KW V5 Racing, KW V6 Racing dampers, as well as selected KW DDC coilover kits.

Generic diagram illustrating the networked functionality of the KW DDC coilover suspension kit
Here is a generic diagram showing how our networked semi‑active suspension kit operates within a vehicle

For the RUF SCR, we developed semi‑active dampers equipped with two independently controlled electromagnetic proportional valves for compression and rebound. Using four wheel acceleration sensors, three body acceleration sensors, and our suspension control unit, vertical wheel acceleration, body movement, roll, pitch, steering angle, and vehicle speed are evaluated up to 1,000 times per second. In real time, the suspension control unit regulates the valves, adjusting damping forces within twelve milliseconds.

RUF SCR on a country road equipped with KW suspension
The RUF SCR is constantly eager for corners

Within the limits of physics, the dampers compensate for road irregularities in a sporty yet harmonious manner, improving traction, enhancing road holding, and supporting the characteristic RUF handling. Every steering input is translated directly, and the RUF SCR is eager to turn into corners. Everything is perfectly matched, and in theory, the SCR could even be used to commute to the office or driven daily in all weather conditions.

The RUF SCR features a hydraulic lift system at the front axle that increases ground clearance by up to 45 mm at the push of a button
At the front axle, our semi‑active suspension developed for RUF Automobile is additionally equipped with hydraulic lift cylinders

One detail that perfectly highlights everyday usability is our KW HLS Evolution system. The dampers are fitted with two hydraulic lift cylinders that raise the front end by up to 45 mm at the press of a button. Speed bumps or steep garage entrances are no longer an obstacle. Purism, yes—but without scratches on the carbon underbody.

Inside the current RUF SCR, all interior elements are trimmed in the finest materials such as leather
Interior finished with the finest materials

Although the RUF SCR is a beautifully purist driving machine, the cabin is far from being as spartan as a race car. All interior elements are upholstered in high‑quality leather or velour, creating a calm and refined atmosphere.

Of course, the sport bucket seats are not as comfortable as your grandfather’s armchair—but that is not what RUF drivers are looking for. They want to drive. Unfiltered. That is why there are no electronic driver assistance systems such as lane‑keeping assist or speed‑limit warnings. The only real safety net is ABS—and voluntary self‑control.

Photos Ruf Automobile, KW

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