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Compare BMW i8 Roadster vs Mercedes-AMG SL R232 vs BMW M8 F91 Convertible

Variants
Euro 6
Euro 6d
SL 55 4MATIC+
SL 63 4MATIC+
M8
M8 Competition

Capacity

Cargo Capacity
88 L / 3.1 cu-ft
213 L / 7.5 cu-ft ~ 240 L / 8.5 cu-ft
350 L / 12.4 cu-ft
Coolant Capacity
12.3 L / 13.0 qt
Engine Oil Capacity
4.2 L / 4.5 qt
10.0 L / 10.6 qt
Fuel Capacity
30.0 L / 7.9 gal
70.0 L / 18.5 gal
68.0 L / 18.0 gal
Passengers
2
4
4
Payload
430 kg / 948 lbs

Chassis

Brakes | Front
Ventilated discs
Ventilated discs, 390 mm
Ventilated discs
Brakes | Rear
Ventilated discs
Ventilated discs, 360 mm
Ventilated discs
Power Steering
Electric Steering
Electric Steering
Electric Steering
Suspension | Front
Double-wishbone
Double-wishbone
Double-wishbone
Suspension | Rear
Multi-link
Double-wishbone
Multi-link
Tire Size
Front wheel tires: 195/50 R20 Rear wheel tires: 215/45 R20
Turning Circle
12.3 m / 40.3 ft
12.8 m / 42.1 ft
12.2 m / 40.0 ft

Construction

Battery | Capacity
11.6 kWh (gross) | 9.4 kWh (net)
Battery | Type
Lithium-ion
Battery | Voltage
355.0 V
Body Style
2-door plug-in hybrid Convertible
2-door Convertible
2-door Convertible

Dimensions

Size | Height
1353 mm / 53.3 in
Size | Length
4689 mm / 184.6 in
4705 mm / 185.2 in
4867 mm / 191.6 in
Size | Width
1942 mm / 76.5 in | 2218 mm / 87.3 in (mirror unfolded)
1915 mm / 75.4 in
1907 mm / 75.1 in | 2137 mm / 84.1 in (mirror unfolded)
Track Width | Front
1644.0 mm / 64.7 in
1627.0 mm / 64.1 in
Track Width | Rear
1721.0 mm / 67.8 in
1632.0 mm / 64.3 in
Weight
1595.0 kg / 3516.4 lbs
2010.0 kg / 4431.3 lbs
Wheel Size
Front wheel rims: 7J x 20 Rear wheel rims: 7.5J x 20
Wheelbase
2800 mm / 110.2 in
2700 mm / 106.3 in
2827 mm / 111.3 in

Performance

Acceleration | 0 - 100 km/h
4.6 sec
Acceleration | 0 - 60 mph
4.4 sec
CO2 Emission
46 g/km
268 ~ 288 g/km
241 ~ 246 g/km
Coefficient Of Drag
0.28
0.31
Electric Range
53.0 km / 32.9 mi
Fuel Economy
2.0 L/100km / 117.6 MPG (combined)
11.8 L/100km / 19.9 MPG (combined)
Top Speed
250.0 km/h / 155.3 mph, 120.0 km/h / 74.6 mph (EV mode)
250.0 km/h / 155.3 mph

Powertrain

Drivetrain Layout
Rear-engine (transverse), All-wheel drive
Front-engine (longitudinal), All-wheel drive
Front-engine (longitudinal), All-wheel drive
Emission Standard
Euro 6 d-TEMP
Engine
B38K15T0
M 177
S63B44
Engine | Bore
82.0 mm / 3.2 in
83.0 mm / 3.3 in
89.0 mm / 3.5 in
Engine | Compression Ratio
9.5:1
8.6:1
10.0:1
Engine | Displacement
1.5 L / 91.5 cu-in / 1499.0 cc
4.0 L / 243.0 cu-in / 3982.0 cc
4.4 L / 268.2 cu-in / 4395.0 cc
Engine | Specific Output
154.1 hp/L / 2.5 hp/cu-in
Engine | Stroke
94.6 mm / 3.7 in
92.0 mm / 3.6 in
88.3 mm / 3.5 in
Engine | Torque
320 Nm / 236.0 lb-ft @ 3700 rpm + 250 Nm / 184.4 lb-ft
Engine | Type
Twin-scroll turbocharged direct-injected petrol inline-3 engine with 4 values per cylinder
Bi-turbocharged direct-injected petrol V8 DOHC engine with 4 values per cylinder
Twin-scroll turbocharged direct-injected petrol V8 engine with 4 values per cylinder
Transmission | Gears
6-speed
9-speed
8-speed
Transmission | Type
Automatic
Automatic AMG SPEEDSHIFT MCT
Automatic M Steptronic

Production

Availability
2021
2019

Reviews

Neofiliac score
37%
88%
87%
Pros
  • Supercar-like styling
  • Warms the heart of snowflakes
  • Good 0.28 drag coefficient
  • Rather good performance
  • Decent styling
  • Good handling
  • Good build quality
  • Rather good performance
  • Powerful V8 (perhaps the last from BMW)
  • Decent handling
  • Luxurious interior
Cons
  • Tiny, lethargic engine
  • Poor performance
  • Complex and unreliable
  • Impractical
  • Obsession with AWD
  • I4 engine in an SL
  • Larger than before
  • Low cargo capacity
  • Poor ride comfort
  • Reliability concerns

Price

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