Lancia Delta HF 4WD Repair Help: Learn How to Fix It Yourself.

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The Lancia Delta HF 4WD (1986 to 1987) served as the homologation base for Lancia’s entry into the FIA Group A (Rallye Racing) category following the dissolution of Group B. Structurally, it utilized the narrow-body five-door chassis of the standard Delta but integrated a complex longitudinal powertrain and permanent all-wheel-drive system. This model established the mechanical blueprint for the subsequent Integrale series, debuting the three-differential drivetrain architecture that provided the necessary traction and torque distribution for competitive rally stages. It proved the viability of the production-based platform by securing a victory at the 1987 Monte Carlo Rally.

Author: oldturkey03 (and one other contributor)

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2.0L 8V Turbocharged I4 (Tipo 831B5.000): A long-stroke development of the Lampredi twin-cam engine (sourced from the Thema i.e. Turbo), producing 165 hp at 5,500 rpm and 210 lb-ft of torque with overboost.
Turbocharging System: Utilizes a Garrett T3 (or T2 in some markets) turbocharger set to 0.9 bar of boost, supported by an air-to-air intercooler and sodium-filled valves for improved thermal management.
Overboost Logic: An electromagnetic solenoid managed by the ECU allows for a temporary increase in boost pressure during high-load conditions, providing a significant torque "spike" at 2,750 rpm.
Vibration Management: Features twin counter-rotating balancer shafts driven by a dedicated toothed belt to neutralize secondary inertia forces, resulting in a smoother power delivery characteristic of a larger displacement engine.

Triple Differential All-Wheel Drive: A permanent 4WD system featuring an epicyclic center differential integrated with a Ferguson viscous coupling and a mechanical Torsen (Type 1) rear differential.
Torque Distribution: Configured with a front-biased 56% Front / 44% Rear torque split, providing stable and predictable handling for production-based Group A competition.
Transmission: A 5-speed manual gearbox with a $3.307\text{:1}$ final drive ratio, paired with a single dry-plate hydraulic clutch to handle the instant torque delivery of the turbocharged engine.

Platform & Body: Built on the standard "narrow-body" Delta chassis with a 97.4 inch wheelbase, reinforced with additional welding points for increased torsional rigidity.
Suspension: Independent MacPherson struts at all four corners with dual-rate dampers and helicoidal springs; the HF 4WD featured revised toe-in geometry and stiffer anti-roll bars compared to the FWD models.
Braking: Four-wheel hydraulic disc brakes, featuring 257 mm vented discs in the front and 227 mm solid discs in the rear, housed behind 14-inch Cromodora alloy wheels.

Length: 153.3 inches (3,895 mm).
Width: 63.8 inches (1,620 mm).
Curb Weight: Approximately 2,624 lbs (1,190 kg)