Street Specification Suspension

In the Carrera RS and Carrera Cup USA Porsche changes essentially every component of the standard Carrera 2 suspension.  Firmer Shock absorbers and stiffer progressive rate springs are added at all four corners that are considerably firmer that that of the RS America or normal Carrera 2.  Spring rates go from 169 pounds per inch to 247 pounds per inch in the front and in the rear from the 263 pounds per inch of the RS America to 440 pounds per inch.  These springs lower  overall ride height to approximately 40 mm lower than a European Carrera 2 and 50 mm (~2”) lower than a USA Carrera 2. Alignment is set with one degree more negative camber front and rear.

 The front stabilizer is 2mm larger diameter than the RS America, and 4 mm larger than a normal Carrera 2 and is 5 position adjustable to tune handling to driver preference.  Camber change in the front suspension during cornering, is reduced by harder suspension bushings  used in the lower control arms pivots as well as  the upper spring strut mount which is a ball joint design.  To reduce weight, steel front hubs are replaced with aluminum hubs.  Front suspension uprights are from the Turbo.  

 At the rear suspension, the stabilizer bar is also adjustable in 3 positions but 2 mm smaller in diameter.  Spacers and harder rubber are added to the control mount (outer suspension bushing) to eliminate rear wheel toe in on trailing throttle during cornering, the so called: "Weissach Axle” effect.  The rear control arm adjustment plates are modified and are different left and right and have harder rubber. They can  be flipped side to side, allowing more negative camber for racing applications.  The rear upper shock mount is also changed to a ball joint design, similar to that used at the front.  

The street USA Carrera Cup has monoball mounts front (right) and rear (left) replacing rubber mounts of normal Carrera

Front and rear suspension of the USA Carrera Cup street version is same as that of the European Carrera RS, note the monoball mounts, Bilstein struts and Bilstein rear shocks.Spring rates are 250 lbs per inch front and approximately 450 lbs per inch rear

Details of internal parts rear monoball mount

Details of internal parts front monoball mount