In September 1957 the 1100 was updated again as a 1958 model, most notably with a completely redesigned rear end, and took on the new type code 103 D. It premiered at the Paris Motor Show in October, together with the new 1200 Granluce.
The latter was an elegant saloon, developed from the 1100 designing a more modern bodyshell and enlarging the engine to 1.2 litres, and replaced the 1100 TV.
Therefore, the 1100 range was left temporarily without an upmarket variant, and consisted of just two models: saloon and estate, both sporting contrasting colour roofs as standard.
The saloon's new tail was longer and carried tailfins.
Boot space had increased, and the rear window had also been enlarged.
On the other hand, the estate's sheetmetal was unchanged; body-colour buttresses were added to fit the new tail lights to the 1954-vintage body.

Almost all of the exterior trim was new, including door handles and turn signal repeaters.
Exterior distinguishing features of the 1958 model were a new grille made of thin vertical bars crossed by four horizontal ones, with a Millecento (1100 spelled out in Italian) script on its centre, and "stepped" chrome spears on the sides.

From a mechanical standpoint the main improvement were the uprated brakes, with self-centering brake shoes and wider drums, transversely instead of longitudinally finned.
Engine output went up from 40 to 43 PS CUNA (32 kW) (48 PS SAE) at 4,800 rpm, thanks to a larger carburettor, a new aluminium cylinder head, and a water-cooled inlet manifold with an individual duct per each cylinder.
Top speed rose accordingly to 125 km/h (78 mph).
In September 1957 the 1100 was updated again as a 1958 model, most notably with a completely redesigned rear end, and took on the new type code 103 D. It premiered at the Paris Motor Show in October, together with the new 1200 Granluce. The latter was an elegant saloon, developed from the 1100 designing a more modern bodyshell and enlarging the engine to 1.2 litres, and replaced the 1100 TV. Therefore, the 1100 range was left temporarily without an upmarket variant, and consisted of just two models: saloon and estate, both sporting contrasting colour roofs as standard. The saloon's new tail was longer and carried tailfins. Boot space had increased, and the rear window had also been enlarged. On the other hand, the estate's sheetmetal was unchanged; body-colour buttresses were added to fit the new tail lights to the 1954-vintage body.
Almost all of the exterior trim was new, including door handles and turn signal repeaters. Exterior distinguishing features of the 1958 model were a new grille made of thin vertical bars crossed by four horizontal ones, with a Millecento (1100 spelled out in Italian) script on its centre, and "stepped" chrome spears on the sides.
From a mechanical standpoint the main improvement were the uprated brakes, with self-centering brake shoes and wider drums, transversely instead of longitudinally finned. Engine output went up from 40 to 43 PS CUNA (32 kW) (48 PS SAE) at 4,800 rpm, thanks to a larger carburettor, a new aluminium cylinder head, and a water-cooled inlet manifold with an individual duct per each cylinder. Top speed rose accordingly to 125 km/h (78 mph).
Fiat 1100