1989 Lancia Delta Integrale

The Lancia HF Integrale incorporated some of the features of the Delta HF 4WD into a road car. The engine was an 8-valve 2 L fuel injected 4-cylinder, with balancing shafts. The HF version featured new valves, valve seats and water pump, larger water and oil radiators, more powerful cooling fan and bigger air cleaner. A larger capacity Garrett T3 turbocharger with improved air flow and bigger inter-cooler, revised settings for the electronic injection/ignition control unit and a knock sensor, boost power output to 185bhp (DIN) (136kW) at 5300rpm and maximum torque of 31m·kgf (304N·m, 224lbf·ft) at 3500rpm.

The HF Integrale had permanent 4-wheel drive, a front transversely mounted engine and five-speed gearbox. An epicyclic centre differential normally splits the torque 56 per cent to the front axle, 44 per cent to the rear. A Ferguson viscous coupling balanced the torque split between front and rear axles depending on road conditions and tyre grip. The Torsen rear differential further divides the torque delivered to each rear wheel according to grip available. A shorter final drive ratio (3.111 instead of 2.944 on the HF 4WD) matched the larger 6.5x15 wheels to give 24mph/1000rpm (39km/h per 1000rpm) in fifth gear.

Braking and suspension were uprated to 284mm (11.2in) ventilated front discs, a larger brake master cylinder and servo, as well as revised front springs, dampers, and front struts.