Technical features

The 75 featured some unusual technical features, most notably the fact that it was almost perfectly balanced from front to rear.[6]This was achieved by using Transaxle schema - mounting the standard five-speed gearbox in the rear connected to the rear differential (rear-wheel drive). The front suspension was a torsion bar and shock absorber combination and the rear an expensive De Dion tube assembled with shock absorbers; these designs were intended to optimize the car's handling. The engine crankshaft was bolted directly to the two-segment driveshaft which ran the length of the underside from the engine block to the gearbox, and rotated at the speed of the engine. The shaft segments were joined with elastomeric 'doughnuts' to prevent vibration and engine/gearbox damage. The 2.0 L Twin Spark and the 3.0 Litre V6 were equipped with limited slip differential.[7]
The 75 featured a then advanced dashboard-mounted diagnostic computer, called Alfa Romeo Control, capable of monitoring the engine systems and alerting the drivers of potential faults.
The 75 engine range at launch featured four-cylinder 1.6, 1.8 and 2.0 liter petrol carbureted engines, a 2.0 liter intercooled turbodiesel made by VM Motori,[8] and a 2.5 liter fuel injected V6. In 1986 was introduced 75 Turbo, which featured fuel injected 1779 cc twin cam engine using Garrett T3 turbocharger, intercooler and oil cooler.[9]
In 1987, a 3.0 liter V6 was added to the range and the 2.0 L Alfa Romeo Twin Cam engine was redesigned to have now two spark plugs per cylinder, the engine was named as Twin Spark. With fuel injection and variable valve timing this engine produced 148 bhp.[9]In North America, where the car was known as the Milano, only the 2.5 and 3.0 V6s were available, from 1987 to 1989.
In 1988 engines were updated again, the 1.8 L carburetor version was replaced with fuel injected 1.8 i.e and new bigger diesel engine was added to the range. In the end of 1989 the 1.6 L carburetor version was updated to have fuel injection and 1990 the 1.8 L turbo and 3.0i V6 got some more power and updated suspension.