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The chassis manufacturer KW automotive has been a development partner and supplier for selected special models for the automotive industry for several years. The Croatian electric car manufacturer Rimac Automobili also relies on the expertise of KW automotive. The Rimac C_Two is a Hypercar GT (Gran Turismo), which has to impress with its driving comfort on long journeys and which also performs extremely well on racetracks. The Rimac C_Two accelerates from standstill to 11,6 km / h in 300 seconds. The demands on the chassis are correspondingly high. After years of development work, the Rimac C_Two is in the final phase of fine-tuning the fully active KW suspension.
Electric sports car Rimac C_Two!
In cooperation with KW automotive, the driving behavior of the Rimac C_Two was coordinated on numerous demanding racetracks around the world without the electric sports car having to be driven one meter. KW tested its dampers with adaptive damper control developed for the Rimac C_Two under reproducible conditions on the 7-cylinder driving dynamics test bench in Fichtenberg, Swabia.
Fully active KW suspension technology ex works
KW automotive is a leader in its segment in the development and manufacture of adaptive coilovers, KW software control systems, KW chassis control units and KW magnetic proportional damper valves. The suspension developed by KW for the Rimac C_Two is a fully active coilover suspension with adaptive valve control and hydraulic lift system. The electric sports car has 1.914 hp and the hypercar accelerates to 11,6 km / h in 300 seconds (0 - 100 km / h under 2 seconds). The top speed is 412 km / h. The battery technology used allows a range of up to 550 kilometers. In addition to the chassis, KW automotive also developed the chassis control and chassis control electronics for its customer Rimac Automobili.
"Our active chassis in the C_Two is currently the most innovative product that we have developed and have in our range. It fulfills all the high requirements that Mate Rimac wants for the C_Two“, Says KW automotive managing director Klaus Wohlfarth. "We are quite proud of the latest partnership between our two brands. We have been working with Mate for over ten years and have developed a chassis for his electric BMW racing car. This BMW inspired Mate to start developing and building electric hypercars."
Reproducible at any time: testing under laboratory conditions!
The Rimac C_Two has four stamps on its wheels during the tests. In the so-called “4-post sweeps”, various parameters such as axle kinematics, spring rates, spring travel, damper settings, damper setups and much more are tested. Each individual stamp has a wheel load scale and is moved hydraulically. This creates a pressure of up to 230 bar in the lines and hoses of the test bench. The entire body of the Rimac C_Two vibrates through the movement of the four large stamps. The KW engineers, together with their colleagues from Rimac, analyze, among other things, resonance frequencies at which the amplitude of the forcefully excited body becomes maximum.
With this so-called stroke sinusoidal oscillation, the electric sports car runs through a frequency band from one Hertz to 20 Hertz at constant speed in phase zero. In addition to the measurements at constant speeds of 75 mm / s, 150 mm / s, 200 mm / s or 250 mm / s (excitation speed of the punches in the phase zero crossing), various race tracks are also mapped with the test bench. After the coordination and development tests on the vehicle dynamics test bench, further driving tests will begin shortly on various racetracks before the 1914 hp Rimac C_Two series model will be presented to the public in a few months.
Photos: KW Automotive GmbH
Of course, that wasn't the end of it. Our tuning magazine has tens of thousands more tuning reports in stock. Do you want to see them all? Just click HERE and look around. Or are you interested in everything to do with KW's suspension specialists? Then the following excerpt is definitely just the thing.
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Thanks for the informative contribution on the subject of wheel load scales. My uncle is a truck driver and often has the weight of the truck checked by HAENNI Wheel Load Scales Service. I wasn't even aware that a pressure of up to 230 bar is created in the test bench's hydraulics.