Car comparison

BMW Z4 (G29) 20ivsAUDI TT Roadster (8S) 1.8 TFSI

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

New comparison

BMW Z4 (G29)

20i

197 hp1998 ccGasolineRWDAutomaticTurbochargedRoadster2018-2022
VS

AUDI TT Roadster (8S)

1.8 TFSI

180 hp1798 ccGasolineFWDAutomaticTurbochargedRoadster2015-2018

Comparison overview

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

Best choices

BMW Z4 (G29) 20i

  • Quickest 0-100 km/h
    6.6 s
  • Fastest top speed
    240 km/h
    149 mph
  • Most powerful
    197 hp
    147 kW
  • Highest torque
    320 Nm
    236 lb-ft
  • Best power-to-weight
    138 hp/t
    103 kW/t
    7.3 kg/hp
  • Lowest combined fuel consumption
    6.0 L/100 km
    39.2 mpg US
    47.1 mpg UK
  • Lowest city consumption
    7.2 L/100 km
    32.7 mpg US
    39.2 mpg UK
  • Lowest highway consumption
    5.2 L/100 km
    45.2 mpg US
    54.3 mpg UK
  • Best estimated range
    867 km
    539 mi
  • Largest trunk
    281 L
  • Best overall score
    48/100
  • Best performance score
    55/100
  • Best economy score
    91/100
  • Best practicality score
    32/100

Specification comparison

Specification comparison
ModelBMWZ4 (G29)20iAUDITT Roadster (8S)1.8 TFSI
Power
197hp147kW
180hp134kW
Torque
320Nm236lb-ft
250Nm184lb-ft
Curb weight
1,430kg3,153lb
1,320kg2,910lb
Gross weight
1,740kg3,836lb
1,640kg3,616lb
Top speed
240 km/h
149 mph
237 km/h
147 mph
To 99% top speed
77.9s99% target: 238 km/h / 148 mph
Calculated
87.8s99% target: 235 km/h / 146 mph
Calculated
0-100 km/h
6.6s
7.3s
0-200 km/h
26.3s
Calculated
30.4s
Calculated
0-60 mph
6.3s
Calculated
6.9s
Calculated
Fuel consumption
6L/100 km39.2mpg US47.1mpg UK
6L/100 km39.2mpg US47.1mpg UK
Fuel consumption city
7.2L/100 km32.7mpg US39.2mpg UK
7.3L/100 km32.2mpg US38.7mpg UK
Fuel consumption highway
5.2L/100 km45.2mpg US54.3mpg UK
5.2L/100 km45.2mpg US54.3mpg UK
Quarter mile
14.6s
Calculated
15.2s
Calculated
Power-to-weight
138hp/t103kW/t62hp/1000 lb
Calculated
136hp/t102kW/t62hp/1000 lb
Calculated
Torque-to-weight
224Nm/t150lb-ft/ton
Calculated
189Nm/t127lb-ft/ton
Calculated
Estimated range
867km539mi
Calculated
833km518mi
Calculated
Displacement
1,998cc122cu in
1,798cc110cu in
Length
4,324mm170in
4,177mm164in
Width
1,864mm73in
1,832mm72in
Height
1,304mm51in
1,355mm53in
Wheelbase
2,470mm97in
2,505mm99in
Front track
1,609mm63in
1,572mm62in
Rear track
1,616mm64in
1,552mm61in
Ground clearance
117mm5in
-
Trunk volume
281L
280L
Doors
2
2
Seats
2
2
Fuel tank
52L
50L
CO2 emissions-
136g/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.

BMW Z4 (G29) 20iAUDI TT Roadster (8S) 1.8 TFSIPowerTorque
  • BMW Z4 (G29) 20i: Power / Torque
  • AUDI TT Roadster (8S) 1.8 TFSI: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMWZ4 (G29)20i4,500-6,500 rpm1,450-4,200 rpm6,750 rpm
AUDITT Roadster (8S)1.8 TFSI5,100-6,200 rpm1,250-5,000 rpm6,450 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMWZ4 (G29)20iAUDITT Roadster (8S)1.8 TFSI
Acceleration checkpoints
0-60 mph
0-97 km/h
6.3 s
6.9 s
0-100 km/h
0-62 mph
6.6 s
7.3 s
0-200 km/h
0-124 mph
26.3 s
30.4 s
Top speed
240 km/h
149 mph
237 km/h
147 mph
Drag race simulation
60 ft
18 m
2.4 s
2.5 s
330 ft
101 m
6.4 s
6.6 s
1/8 mile
201 m
9.6 s
10.0 s
1000 ft
305 m
12.3 s
12.8 s
1/4 mile
402 m
14.6 s
15.2 s
Trap speed
1/4 mile
402 m
158 km/h
98 mph
152 km/h
95 mph

Power comparison

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

Chart data table
VehicleValue
BMWZ4 (G29)20i
197 hp
147 kW
AUDITT Roadster (8S)1.8 TFSI
180 hp
134 kW

BMW Z4 (G29) 20i has 17 hp more than AUDI TT Roadster (8S) 1.8 TFSI.

The biggest power difference is between AUDI TT Roadster (8S) 1.8 TFSI and BMW Z4 (G29) 20i: 17 hp (13 kW).

Torque comparison

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

Chart data table
VehicleValue
BMWZ4 (G29)20i
320 Nm
236 lb-ft
AUDITT Roadster (8S)1.8 TFSI
250 Nm
184 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMWZ4 (G29)20i
1,430 kg
3,153 lb
AUDITT Roadster (8S)1.8 TFSI
1,320 kg
2,910 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
BMWZ4 (G29)20i
240 km/h
149 mph
AUDITT Roadster (8S)1.8 TFSI
237 km/h
147 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
BMWZ4 (G29)20i6.6 s
AUDITT Roadster (8S)1.8 TFSI7.3 s

The biggest 0-100 km/h difference is between BMW Z4 (G29) 20i and AUDI TT Roadster (8S) 1.8 TFSI: 0.7 s.

Fuel consumption comparison

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

Chart data table
VehicleValue
BMWZ4 (G29)20i
6.0 L/100 km
39.2 mpg US
47.1 mpg UK
AUDITT Roadster (8S)1.8 TFSI
6.0 L/100 km
39.2 mpg US
47.1 mpg UK

Power-to-weight comparison

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

Chart data table
VehicleValue
BMWZ4 (G29)20i
138 hp/t
103 kW/t
7.3 kg/hp
AUDITT Roadster (8S)1.8 TFSI
136 hp/t
102 kW/t
7.3 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMWZ4 (G29)20i
867 km
539 mi
AUDITT Roadster (8S)1.8 TFSI
833 km
518 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMWZ4 (G29)20i
197 hp
147 kW
6.6 s
240 km/h
149 mph
AUDITT Roadster (8S)1.8 TFSI
180 hp
134 kW
7.3 s
237 km/h
147 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
BMWZ4 (G29)20i
Power
197 hp
147 kW
0-100 km/h6.6 s
Top speed
240 km/h
149 mph
Doors/seats
2 doors
2 seats
Trunk
281 L
9.9 cu ft
Length
4,324 mm
170.2 in
Height
1,304 mm
51.3 in
AUDITT Roadster (8S)1.8 TFSI
Power
180 hp
134 kW
0-100 km/h7.3 s
Top speed
237 km/h
147 mph
Doors/seats
2 doors
2 seats
Trunk
280 L
9.9 cu ft
Length
4,177 mm
164.4 in
Height
1,355 mm
53.3 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
BMWZ4 (G29)20i
Power
197 hp
147 kW
0-100 km/h6.6 s
Top speed
240 km/h
149 mph
6.0 L/100 km
39.2 mpg US
47.1 mpg UK
AUDITT Roadster (8S)1.8 TFSI
Power
180 hp
134 kW
0-100 km/h7.3 s
Top speed
237 km/h
147 mph
6.0 L/100 km
39.2 mpg US
47.1 mpg UK

BMW Z4 (G29) 20i 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
BMWZ4 (G29)20i
6.0 L/100 km
39.2 mpg US
47.1 mpg UK
6.6 s
AUDITT Roadster (8S)1.8 TFSI
6.0 L/100 km
39.2 mpg US
47.1 mpg UK
7.3 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
BMWZ4 (G29)20i
138 hp/t
103 kW/t
7.3 kg/hp
6.0 L/100 km
39.2 mpg US
47.1 mpg UK
AUDITT Roadster (8S)1.8 TFSI
136 hp/t
102 kW/t
7.3 kg/hp
6.0 L/100 km
39.2 mpg US
47.1 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMWZ4 (G29)20iAUDITT Roadster (8S)1.8 TFSI
Power
197 hp
147 kW
180 hp
134 kW
Torque
320 Nm
236 lb-ft
250 Nm
184 lb-ft
Acceleration
6.6 s
7.3 s
Top speed
240 km/h
149 mph
237 km/h
147 mph
Lightness
1,430 kg
3,153 lb
1,320 kg
2,910 lb
Fuel consumption
6.0 L/100 km
39.2 mpg US
47.1 mpg UK
6.0 L/100 km
39.2 mpg US
47.1 mpg UK
Practicality
Doors/seats
2 doors
2 seats
Trunk
281 L
9.9 cu ft
Length
4,324 mm
170.2 in
Height
1,304 mm
51.3 in
Doors/seats
2 doors
2 seats
Trunk
280 L
9.9 cu ft
Length
4,177 mm
164.4 in
Height
1,355 mm
53.3 in
Range score
867 km
539 mi
833 km
518 mi
CO2 score
-
136 g/km
Trunk score
281 L
9.9 cu ft
280 L
9.9 cu ft
Power-to-weight score
138 hp/t
103 kW/t
7.3 kg/hp
136 hp/t
102 kW/t
7.3 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
VehicleBMW Z4 (G29) 20iAUDI TT Roadster (8S) 1.8 TFSI
Consumption6 L/100 km39.2 mpg US47.1 mpg UK6 L/100 km39.2 mpg US47.1 mpg UK
Cost / 100 km10.50 LC100 km10.50 LC100 km
Cost / 100 mi16.90 LC100 mi16.90 LC100 mi
Annual fuel used900 L238 US gal198 UK gal900 L238 US gal198 UK gal
Annual fuel cost1,575 LC/year1,575 LC/year

Head-to-head comparisons

BMW Z4 (G29) 20i

  • Has 17 hp more
  • Has 70 Nm more
  • Is 0.7 s quicker from 0-100 km/h
  • Has 3 km/h (2 mph) higher top speed
  • Has 1 hp/t better power-to-weight
  • Has 33 km (21 mi) more estimated range
  • Has 1 L more trunk volume

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Most powerful
  • Highest torque
  • Lowest combined fuel consumption
  • Best power-to-weight ratio
  • Best estimated range
  • Largest trunk

Cons

  • Heaviest

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW Z4 (G29) 20i
AUDI TT Roadster (8S) 1.8 TFSI
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