4.24v. II (cat.) - 1991 to 1993
In 1991 the entire Biturbo range was subject to a restyling, which brought new headlights, bumpers, rearview mirrors and a thinner grille, all under the supervision of the famous designer Marcello Gandini. Launched only a few months earlier, the 4.24v. was already sold with the new seven-spoke alloys and rear spoiler, but was now further improved by these latest modifications.
Simultaneously, the catalytic exhaust system was adopted to meet new homologation requirements, with a subsequent increase in weight and slight decrease in power. However, performances remained very much in line with the first series model. This second version was produced in 490 units until 1993, bringing total production of the 4.24v. to 874.
Technical data
| 0-60 mph | 0 to 100 km/h in 6.3 sec. (with cat.) |
| Bodywork | four-door saloon seating five |
| Bore and stroke | 82x63 mm |
| Brakes | discs all round (ventilated front discs with floating calipers), ATE dual circuit, servo-assisted, additional drums on rear wheels for emergency and parking |
| Brakes front | |
| Brakes rear | |
| Chassis | monocoque steel construction |
| Compression ratio | 7.6:1 |
| Cooling system | water-cooled, centrifugal pump |
| Displacements (unitary) | |
| Dry weight | 3,110 lbs (1,410 kg) |
| Engine | 90° V6, light alloy block and head with Nigusil-based aluminum cylinder liners |
| Engine weight | |
| First race | |
| Front Tyres | |
| Front suspension | MacPherson struts, dual-rate telescopic dampers, coil springs, anti-roll bar, 4-position electronic adaptive damping |
| Front track | 57.40 in. (1458 mm) |
| Fuel & lubricant | |
| Fuel feed | two IHI water-cooled turbos, two air-to-air intercoolers, constant overboost |
| Fuel tank | 17.58 Imp. gal. (80 litres) |
| Gear ratios | |
| Height | 54.25 in. (1,378 mm) |
| Ignition | electronic ignition and injection |
| Kerb weight | |
| Length | 173.62 in. (4,410 mm) |
| Length-Width-Height | |
| Lubrication | full-flow filter lubrication |
| Maximum power | 240 bhp at 6,000 rpm (with cat.) |
| Maximum torque | 34 kgm (246.4 lbs/ft) at 3,000 rpm (with cat.) |
| Model | 4.24v. II (cat.) |
| One mile | 0 to 1000m. in 26.4 sec. (with cat.) |
| Production dates | 1991-1993 |
| Production start | 1991 |
| Quarter mile | |
| Rear Tyres | |
| Rear suspension | semi-trailing rear arms mounted on a rear subframe, coil springs, dual-rate pressurised telescopic dampers, 4-position electronic adaptive damping |
| Rear track | 57.48 in. (1460 mm) |
| Reduction | |
| Steering | hydraulic power-assisted rack and pinion |
| Timing gear | four valves per cylinder (two intake, two exhaust), twin overhead camshafts per cylinder bank |
| Top speed | over 140 mph (225 km/h) |
| Total displacement | 1,996 cc |
| Transmission | 5-speed ZF + reverse, rear-wheel drive, Ranger differential |
| Tyres | fr/rear 205/50 ZR 16 |
| Weight distribution | |
| Wheelbase | 102.36 in. (2,600 mm) |
| Wheels | alloy, 7" J x 16" |
| Width | 68.11 in. (1,730 mm) |