2003 Mercedes-Benz SL-Class
Body style(s):
2-door hardtop roadster

Trim levels:
SL500
SL55 AMG
MSRP:
$85,990
$113,250

Notes: The new-for-2003 SL-Class was the fifth generation of Mercedes's Sport-Leicht roadster, which began life as the Gullwing in the 1950s. The new R230, while sporty (especially in its powertrain), was not, however, light by any stretch of the imagination. The new roadster was available only with V8 engines for 2003; a V12-powered SL600 debuted for 2004, and the SL350 six-cylinder was not imported at all. The SL500 was the base model, with a 5.0L naturally-aspirated V8. The hyper-aspirated SL55 was the first AMG version of the SL-Class roadster. With massive brakes (with 8-piston calipers in the front) and the supercharger, the SL55 was clearly Mercedes-Benz's performance flagship. Both were driven by a five-speed automatic gearbox coupled to the rear wheels. While manumatic operation was available on both, only the SL55 AMG offered buttons on the steering wheel to control the shifts. A power-operated hardtop was the only roof choice, a class-leading feature. In just 16 seconds, the top-flight Mercedes could switch from closed coupe to open roadster. The new SL-Class had a bevy of other high-tech features. It used brake-by-wire technology, meaning there was no direct linkage between brake pedal and the rotors. An active suspension system used coil and air springs, and obviated the need for an anti-roll bar. An automatic rollbar was also available, and would deploy if sensors indicated that the car was rolling over. A Panorama glass roof was optional. Coefficient of drag: only 0.29 with the top up, and 0.34 with it down. Impressive, indeed. All in all, the new SL-Class represented a superb open-top grand tourer.

Series: 2003-current

DESIGN

Powertrain:
Construction:
Seats:

Engine(s):
longitudinal front-engine, rear-wheel drive
steel unibody
2

5.0L 24-valve sohc SFI V8 [SL500]
Bore x stroke: 97.0x84.0mm
Compression ratio: 10.0 to 1 (91-octane unleaded)
Horsepower (SAE net): 302bhp@5600rpm
Torque (SAE net): 339lb-ft@2700rpm
Transmission: 5-speed manumatic (f.d. ratio 2.82:1)
EPA fuel economy (city/hwy, 1985 test): 15/22mpg
5.4L 24-valve sohc SFI supercharged & intercooled V8 [SL55 AMG]
Bore x stroke: 97.0x92.0mm
Compression ratio: 9.0 to 1 (91-octane unleaded)
Boost pressure: 11.6psi
Horsepower (SAE net): 493bhp@6100rpm
Torque (SAE net): 516lb-ft@2750rpm
Transmission: 5-speed manumatic (final drive ratio 2.82:1)
EPA fuel economy (city/hwy, 1985 test): 14/20mpg

DIMENSIONS

EPA Class:
Wheelbase:
Length:
Width:
Height:
Track, F:
Track, R:
Clearance:
TWO-SEATER
100.8"
178.5"
71.5"
51.1"
61.4"
60.9"
4.5"
Curb weight: 4045lbs.
4411lbs. (SL55)
Interior volume:
Cargo volume:
Fuel tank:
51 cu ft.
8.3-11.2 cu ft. (power top down/up)
21.1 gal.

TECHNICAL

Tires:
Suspension
(f/r):
Brakes (f/r):

Steering:
Active sys.:
Airbags:
255/45-17; 255/40-18f, 285/35-18r (SL55, opt. SL500)
independent: short/long A-arms, coil springs, active pneumatic springs
independent: multilink, coil springs, active pneumatic springs
disc/disc, ABS & brake assist (13.0" vented/11.8" vented)
SL55: disc/disc, ABS & brake assist (14.2" vented/13.0" vented)
rack-and-pinion, variable power-assisted (ratio 16.3:1, 2.6 turns-to-lock)
traction control (std.), stability control (std.), automatic rollover bars (std.)
dual front, dual front side/curtain, driver knee

PERFORMANCE

Acceleration (zero to 60 mph):
Braking (60 to zero mph):
Roadholding (skidpad):
Slalom speed (100' intervals):
Turning circle:
6.1sec., 4.5sec. (SL55)
117ft. (SL500)
0.90g (SL500)
67.6mph (SL500)
36.2ft.


SEE ALSO: none
COMPETITORS: BMW Alpina V8 Roadster, BMW Z8, Jaguar XKR, Lexus SC430, Maserati 4200GT Spyder, Panoz Esperante Porsche 911 Cabriolet

2003 Mercedes-Benz SL500 roadster
Mercedes-Benz SL-Class roadster [photo by Scott Jacobs, courtesy Edmunds.com].

2003 Mercedes-Benz SL55 AMG roadster
Mercedes-Benz SL55 AMG roadster.


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