2004 Jaguar XK-RS Concept
CHICAGO, Illinois, February 5, 2004 – The most powerful road-going Jaguar convertible ever – the 550 horsepower XK-RS concept car – was unleashed at the 2004 Chicago Auto Show today.
Developed by Michigan-based Rocketsports Racing in cooperation with Jaguar North America, the XK-RS concept demonstrates how Jaguar’s luxury GT road car can be transformed into a thundering 200-mph supercar. Engineers at Rocketsports’ Lansing, Michigan workshop took the already-potent Jaguar AJ-V8 Trans-Am race engine and increased its displacement by stroking it out from 4.5 liters to 5.0 liters.
To ensure drivability, the engineers reinstalled an Eaton supercharger to deliver an estimated 550 bhp and 500 lb. ft. of torque, giving the car the power to accelerate from standstill to 60 mph in under four seconds, and take it to a top speed of 200 mph.
To make the car more involving for the sports car enthusiast, the standard six-speed ZF automatic transmission was replaced with a five-speed manual transaxle. Re-positioning the driveline weight to the rear of the car also results in a perfect 50:50 weight balance for improved handling.
Rocketsports also used the team’s considerable expertise in high-speed aerodynamics with its Jaguar XKR Trans-Am race cars, modifying the production XKR’s body to ensure ground-hugging stability at very high speeds. Special underbody air tunnels running the length of the car were created, along with deeper front and rear spoilers, wider wheel arches and aero-style sill sections. When tested in the wind tunnel, the changes are expected to result in a 100 percent increase in aerodynamic downforce at top speed compared to the standard car.
The production XKR’s suspension was also modified to ensure supercar handling. The changes include the addition of coil-over high-performance Penske shocks. To give the concept the kind of stopping power that matches its anticipated grip, R-Performance Brembo calipers with drilled rotors (13-inch front/12-inch rear) were added.
And no 200 mph supercar would be complete without a dramatic wheel and tire combination. The XK-RS comes fitted with three-piece wheels – center-lock ‘Machiavelli Gotti’ – 20-inch x 10-inch at the front, 20-inch x 11-inch at the rear – shod with high-performance Michelin Pilot tires.
Inside, the XK-RS features body-hugging Johnson Controls Leap seats clad in black leather with medium grey inserts.
The XK-RS is Rocketsports’ second Jaguar project car. In 2002, Rocketsports created the purposeful -Racing Concept- version of Jaguar’s all-wheel drive X-TYPE. The dramatic-looking concept race car was developed to test the potential of Jaguar’s X-TYPE as a project car for the enthusiast market.
In Detail
| engine | Supercharged Jaguar AJ-V8 Trans-Am |
| position | Front Longitudinal |
| aspiration | Supercharged |
| valvetrain | Custom Rocketsports Valve Train |
| fuel feed | Bosch Fuel Injection |
| displacement | 5000 cc / 305.1 in³ |
| power | 410.1 kw / 550 bhp |
| specific output | 110.0 bhp per litre |
| bhp/weight | 379.05 bhp per tonne |
| torque | 677.91 nm / 500 ft lbs |
| body / frame | Unit Steel; Based on 2004 Jaguar XKR Convertible |
| driven wheels | RWD |
| front tires | Michelin Pilot 285 x 20 |
| rear tires | Michelin Pilot 325 x 20 |
| front brakes | Drilled Rotors w/R-Performance Brembo Calipers |
| f brake size | x 330 mm / x 13.0 in |
| rear brakes | Drilled Rotors w/R-Performance Brembo Calipers |
| r brake size | x 305 mm / x 12 in |
| front wheels | F 50.8 x 25.4 cm / 20 x 10 in |
| rear wheels | R 50.8 x 27.9 cm / 20 x 11 in |
| f suspension | Wishbones w/Coil-over Penske Shocks |
| r suspension | Wishbones w/Coil-over Penske Shocks |
| curb weight | 1451 kg / 3199 lbs |
| transmission | Sequential 5-Speed Transaxle |
| gear ratios | :1 |
| top speed | ~321.9 kph / 200.0 mph |
| 0 – 60 mph | ~3.9 seconds |
