The hatchback generally has more luggage space thanks to a larger trunk door opening and the ability to convert the rear of the passenger compartment into luggage space. Sedans tend to be quieter than hatchbacks, due to a more isolated rear area.
Gearbox:
Automatic
Automatic
Engine:
1.8 Petrol
1.8 Petrol
Performance
Power:
122 HP
150 HP
Torque:
167 NM
210 NM
Acceleration 0-100 km/h:
n/a seconds
9.2 seconds
Opel Signum engine produces 28 HP less power than Audi A4, whereas torque is 43 NM less than Audi A4.
Fuel consumption
Fuel consumption (l/100km):
no data
8.2
Fuel tank capacity:
60 litres
70 litres
Dimensions
Length:
4.64 m
4.55 m
Width:
1.80 m
1.77 m
Height:
1.47 m
1.43 m
Opel Signum is larger. Opel Signum is 9 cm longer than the Audi A4, 3 cm wider, while the height of Opel Signum is 4 cm higher.
Trunk capacity:
no data
445 litres
Trunk max capacity: with rear seats folded down
1410 litres
no data
Turning diameter:
11.2 meters
11.1 meters
The turning circle of the Opel Signum is 0.1 metres more than that of the Audi A4.
Audi A4 has fewer problems. According to annual technical inspection data Opel Signum has serious deffects in 55 percent more cases than Audi A4, so Audi A4 quality is probably significantly better
