Car comparison

Mercedes-Benz SLK (R171) · Facelift 2008 AMG SLK 55 V8vsAUDI TT RS Roadster (8J) 2.5 TFSI

Compare specs, acceleration, fuel consumption, dimensions, practicality, and estimated running costs side by side.

New comparison

Mercedes-Benz SLK (R171) · Facelift 2008

AMG SLK 55 V8

360 hp5439 ccGasolineRWDAutomaticNaturally aspiratedRoadster2008-2011
VS

AUDI TT RS Roadster (8J)

2.5 TFSI

340 hp2480 ccGasolineAWDManualTurbochargedRoadster2009-2010

Comparison overview

Use the estimates as comparison hints and verify exact figures before making decisions.

Best choices

AUDI TT RS Roadster (8J) 2.5 TFSI

  • Quickest 0-100 km/h
    4.7 s
  • Lowest combined fuel consumption
    9.5 L/100 km
    24.8 mpg US
    29.7 mpg UK
  • Lowest city consumption
    13.3 L/100 km
    17.7 mpg US
    21.2 mpg UK
  • Lowest highway consumption
    7.2 L/100 km
    32.7 mpg US
    39.2 mpg UK
  • Best estimated range
    632 km
    392 mi
  • Largest trunk
    250 L
  • Best economy score
    81/100
  • Best practicality score
    30/100

Mercedes-Benz SLK (R171) Facelift 2008 AMG SLK 55 V8

  • Fastest top speed
    270 km/h
    168 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    360 hp
    268 kW
  • Highest torque
    510 Nm
    376 lb-ft
  • Lightest
    1,500 kg
    3,307 lb
  • Best power-to-weight
    240 hp/t
    179 kW/t
    4.2 kg/hp
  • Best overall score
    59/100
  • Best performance score
    73/100

Specification comparison

Specification comparison
ModelMercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8AUDITT RS Roadster (8J)2.5 TFSI
Power
360hp268kW
340hp254kW
Torque
510Nm376lb-ft
450Nm332lb-ft
Curb weight
1,500kg3,307lb
1,510kg3,329lb
Gross weight
1,850kg4,079lb
1,830kg4,034lb
Top speed
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
Calculated
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
61.9s99% target: 267 km/h / 166 mph
Calculated
61.0s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
4.9s
4.7s
0-200 km/h
16.0s
Calculated
16.6s
Calculated
0-60 mph
4.7s
Calculated
4.5s
Calculated
Fuel consumption
12L/100 km19.6mpg US23.5mpg UK
9.5L/100 km24.8mpg US29.7mpg UK
Fuel consumption city
17.7L/100 km13.3mpg US16.0mpg UK
13.3L/100 km17.7mpg US21.2mpg UK
Fuel consumption highway
8.8L/100 km26.7mpg US32.1mpg UK
7.2L/100 km32.7mpg US39.2mpg UK
Quarter mile
12.9s
Calculated
12.8s
Calculated
Power-to-weight
240hp/t179kW/t109hp/1000 lb
Calculated
225hp/t168kW/t102hp/1000 lb
Calculated
Torque-to-weight
340Nm/t227lb-ft/ton
Calculated
298Nm/t199lb-ft/ton
Calculated
Estimated range
583km362mi
Calculated
632km392mi
Calculated
Displacement
5,439cc332cu in
2,480cc151cu in
Length
4,103mm162in
4,198mm165in
Width
1,788mm70in
1,842mm73in
Height
1,271mm50in
1,348mm53in
Wheelbase
2,430mm96in
2,468mm97in
Front track
1,524mm60in
1,555mm61in
Rear track
1,549mm61in
1,546mm61in
Trunk volume
208L
250L
Doors
2
2
Seats
2
2
Fuel tank
70L
60L
CO2 emissions-
221g/km

Performance charts

Use the estimates as comparison hints and verify exact figures before making decisions.

Dyno simulation

Estimated stock-style power and torque curves by engine speed.

Mercedes-Benz SLK (R171) Facelift 2008 AMG SLK 55 V8AUDI TT RS Roadster (8J) 2.5 TFSIPowerTorque
  • Mercedes-Benz SLK (R171) Facelift 2008 AMG SLK 55 V8: Power / Torque
  • AUDI TT RS Roadster (8J) 2.5 TFSI: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V85,750 rpm4,000 rpm6,000 rpm
AUDITT RS Roadster (8J)2.5 TFSI5,400-6,500 rpm1,600-6,500 rpm6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricMercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8AUDITT RS Roadster (8J)2.5 TFSI
Acceleration checkpoints
0-60 mph
0-97 km/h
4.7 s
4.5 s
0-100 km/h
0-62 mph
4.9 s
4.7 s
0-200 km/h
0-124 mph
16.0 s
16.6 s
Top speed
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
Limited
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Likely limited
Drag race simulation
60 ft
18 m
2.2 s
2.1 s
330 ft
101 m
5.7 s
5.6 s
1/8 mile
201 m
8.5 s
8.4 s
1000 ft
305 m
10.9 s
10.8 s
1/4 mile
402 m
12.9 s
12.8 s
Trap speed
1/4 mile
402 m
181 km/h
113 mph
179 km/h
112 mph

Power comparison

Bar comparison chart for Power. Higher is better · hp / kW

Chart data table
VehicleValue
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8
360 hp
268 kW
AUDITT RS Roadster (8J)2.5 TFSI
340 hp
254 kW

Mercedes-Benz SLK (R171) Facelift 2008 AMG SLK 55 V8 has 20 hp more than AUDI TT RS Roadster (8J) 2.5 TFSI.

The biggest power difference is between AUDI TT RS Roadster (8J) 2.5 TFSI and Mercedes-Benz SLK (R171) Facelift 2008 AMG SLK 55 V8: 20 hp (15 kW).

Torque comparison

Bar comparison chart for Torque. Higher is better · Nm / lb-ft

Chart data table
VehicleValue
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8
510 Nm
376 lb-ft
AUDITT RS Roadster (8J)2.5 TFSI
450 Nm
332 lb-ft

Curb weight comparison

Bar comparison chart for Curb weight. Lower is better · kg / lb

Chart data table
VehicleValue
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8
1,500 kg
3,307 lb
AUDITT RS Roadster (8J)2.5 TFSI
1,510 kg
3,329 lb

Top speed without limiter comparison

Bar comparison chart for Top speed without limiter. Higher is better · km/h / mph

Chart data table
VehicleValue
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
AUDITT RS Roadster (8J)2.5 TFSI
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph

0-100 km/h comparison

Bar comparison chart for 0-100 km/h. Lower is better · seconds

Chart data table
VehicleValue
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V84.9 s
AUDITT RS Roadster (8J)2.5 TFSI4.7 s

Although Mercedes-Benz SLK (R171) Facelift 2008 AMG SLK 55 V8 has more power, AUDI TT RS Roadster (8J) 2.5 TFSI is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between AUDI TT RS Roadster (8J) 2.5 TFSI and Mercedes-Benz SLK (R171) Facelift 2008 AMG SLK 55 V8: 0.2 s.

Fuel consumption comparison

Bar comparison chart for Fuel consumption. Lower is better · L/100 km / mpg US / mpg UK

Chart data table
VehicleValue
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8
12.0 L/100 km
19.6 mpg US
23.5 mpg UK
AUDITT RS Roadster (8J)2.5 TFSI
9.5 L/100 km
24.8 mpg US
29.7 mpg UK

The biggest fuel consumption difference is between AUDI TT RS Roadster (8J) 2.5 TFSI and Mercedes-Benz SLK (R171) Facelift 2008 AMG SLK 55 V8: 2.5 L/100 km.

Power-to-weight comparison

Bar comparison chart for Power-to-weight. Higher is better · hp/t / kW/t

Chart data table
VehicleValue
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8
240 hp/t
179 kW/t
4.2 kg/hp
AUDITT RS Roadster (8J)2.5 TFSI
225 hp/t
168 kW/t
4.4 kg/hp

Estimated range comparison

Bar comparison chart for Estimated range. Higher is better · km / mi

Chart data table
VehicleValue
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8
583 km
362 mi
AUDITT RS Roadster (8J)2.5 TFSI
632 km
392 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8
360 hp
268 kW
4.9 s
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
AUDITT RS Roadster (8J)2.5 TFSI
340 hp
254 kW
4.7 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph

Most attractive quadrant

Scatter chart with performance score on the X axis and practicality score on the Y axis.

Chart data table
VehiclePerformance scorePracticality score
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8
Power
360 hp
268 kW
0-100 km/h4.9 s
Top speed
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
2 seats
Trunk
208 L
7.3 cu ft
Length
4,103 mm
161.5 in
Height
1,271 mm
50.0 in
AUDITT RS Roadster (8J)2.5 TFSI
Power
340 hp
254 kW
0-100 km/h4.7 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
2 seats
Trunk
250 L
8.8 cu ft
Length
4,198 mm
165.3 in
Height
1,348 mm
53.1 in

Performance vs fuel economy

Cars closer to the top-right corner combine stronger performance with better fuel economy scores.

Performance vs fuel economy data table
VehiclePerformance scoreFuel economy score
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8
Power
360 hp
268 kW
0-100 km/h4.9 s
Top speed
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
12.0 L/100 km
19.6 mpg US
23.5 mpg UK
AUDITT RS Roadster (8J)2.5 TFSI
Power
340 hp
254 kW
0-100 km/h4.7 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
9.5 L/100 km
24.8 mpg US
29.7 mpg UK

AUDI TT RS Roadster (8J) 2.5 TFSI is closest to the top-right balance target for performance and fuel economy.

Acceleration vs fuel consumption

Cars closer to the lower-left corner offer a better mix of quick acceleration and low fuel consumption.

Acceleration vs fuel consumption data table
VehicleFuel consumption, L/100 km0-100 km/h, s
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8
12.0 L/100 km
19.6 mpg US
23.5 mpg UK
4.9 s
AUDITT RS Roadster (8J)2.5 TFSI
9.5 L/100 km
24.8 mpg US
29.7 mpg UK
4.7 s

Power-to-weight vs fuel consumption

The shaded area favors higher power-to-weight with lower combined fuel consumption.

Power-to-weight vs fuel consumption data table
VehiclePower-to-weight, hp/tFuel consumption, L/100 km
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8
240 hp/t
179 kW/t
4.2 kg/hp
12.0 L/100 km
19.6 mpg US
23.5 mpg UK
AUDITT RS Roadster (8J)2.5 TFSI
225 hp/t
168 kW/t
4.4 kg/hp
9.5 L/100 km
24.8 mpg US
29.7 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleMercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8AUDITT RS Roadster (8J)2.5 TFSI
Power
360 hp
268 kW
340 hp
254 kW
Torque
510 Nm
376 lb-ft
450 Nm
332 lb-ft
Acceleration
4.9 s
4.7 s
Top speed
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
1,500 kg
3,307 lb
1,510 kg
3,329 lb
Fuel consumption
12.0 L/100 km
19.6 mpg US
23.5 mpg UK
9.5 L/100 km
24.8 mpg US
29.7 mpg UK
Practicality
Doors/seats
2 doors
2 seats
Trunk
208 L
7.3 cu ft
Length
4,103 mm
161.5 in
Height
1,271 mm
50.0 in
Doors/seats
2 doors
2 seats
Trunk
250 L
8.8 cu ft
Length
4,198 mm
165.3 in
Height
1,348 mm
53.1 in
Range score
583 km
362 mi
632 km
392 mi
CO2 score
-
221 g/km
Trunk score
208 L
7.3 cu ft
250 L
8.8 cu ft
Power-to-weight score
240 hp/t
179 kW/t
4.2 kg/hp
225 hp/t
168 kW/t
4.4 kg/hp
Overall
Fixed score
Fixed score

Fuel cost and annual usage

Estimate running costs from combined consumption, your annual distance, and the fuel price in your local currency.

Enter the fuel price in your local currency, for example €/L, $/gal, £/L or any other local currency.

LC = Local Currency

Fuel cost and annual usage
VehicleMercedes-Benz SLK (R171) Facelift 2008 AMG SLK 55 V8AUDI TT RS Roadster (8J) 2.5 TFSI
Consumption12 L/100 km19.6 mpg US23.5 mpg UK9.5 L/100 km24.8 mpg US29.7 mpg UK
Cost / 100 km21.00 LC100 km16.63 LC100 km
Cost / 100 mi33.80 LC100 mi26.76 LC100 mi
Annual fuel used1,800 L476 US gal396 UK gal1,425 L376 US gal313 UK gal
Annual fuel cost3,150 LC/year2,494 LC/year

Head-to-head comparisons

Mercedes-Benz SLK (R171) Facelift 2008 AMG SLK 55 V8

  • Has 20 hp more
  • Has 60 Nm more
  • Is 10 kg lighter
  • Has 10 km/h (6 mph) higher top speed
  • Has 15 hp/t better power-to-weight

Pros

  • Highest top speed
  • Most powerful
  • Highest torque
  • Lightest
  • Best power-to-weight ratio

Cons

  • Slowest 0-100 km/h
  • Highest combined fuel consumption
  • Smallest trunk

AUDI TT RS Roadster (8J) 2.5 TFSI

  • Is 0.2 s quicker from 0-100 km/h
  • Uses 2.5 L/100 km less fuel
  • Has 48 km (30 mi) more estimated range
  • Has 42 L more trunk volume

Pros

  • Quickest 0-100 km/h in this comparison
  • Lowest combined fuel consumption
  • Best estimated range
  • Largest trunk

Cons

  • Lowest power
  • Heaviest
  • Lowest top speed

Choose cars to compare

Brand
Model
Generation
Engine or modification
Mercedes-Benz SLK (R171) AMG SLK 55 V8
AUDI TT RS Roadster (8J) 2.5 TFSI
Compare selected cars
2 vehicles selected

Popular comparisons

AMG SLK 55 V8
AMG SLK 55 V8
VS
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8vsMercedes-BenzSLK (R171)AMG SLK 55 V8
2.5 TFSI
2.5 TFSI
VS
AUDITT RS Roadster (8J)2.5 TFSIvsAUDITT RS Roadster (8J)Facelift 20102.5 TFSI
AMG SLK 55 V8
AMG SLK 32 V6
VS
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8vsMercedes-BenzSLK (R170)Facelift 2000AMG SLK 32 V6
2.5 TFSI
2.0 TFSI
VS
AUDITT RS Roadster (8J)2.5 TFSIvsAUDITTS Roadster (8J)2.0 TFSI
AMG SLK 55 V8
SLK 350 V6
VS
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8vsMercedes-BenzSLK (R172)SLK 350 V6
2.5 TFSI
2.0 TFSI
VS
AUDITT RS Roadster (8J)2.5 TFSIvsAUDITTS Roadster (8S)2.0 TFSI
AMG SLK 55 V8
SLK 230 Kompressor
VS
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8vsMercedes-BenzSLK (R170)SLK 230 Kompressor
2.5 TFSI
2.0 TFSI
VS
AUDITT RS Roadster (8J)2.5 TFSIvsAUDITTS Roadster (8J)Facelift 20102.0 TFSI
AMG SLK 55 V8
SL 400 V6
VS
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8vsMercedes-BenzSL (R231)Facelift 2016SL 400 V6
2.5 TFSI
3.2i V6 24V
VS
AUDITT RS Roadster (8J)2.5 TFSIvsAUDITT Roadster (8J)3.2i V6 24V
AMG SLK 55 V8
SL 600 V12
VS
Mercedes-BenzSLK (R171)Facelift 2008AMG SLK 55 V8vsMercedes-BenzSL (R230)Facelift 2008SL 600 V12
2.5 TFSI
2.5 TFSI
VS
AUDITT RS Roadster (8J)2.5 TFSIvsAUDITT RS Coupe (8J)2.5 TFSI
Mercedes-Benz SLK (R171) · Facelift 2008 AMG SLK 55 V8 vs AUDI TT RS Roadster (8J) 2.5 TFSI - car comparison - FastVsFaster