GT6 | Lancia DELTA S4 Rally Car 1985 Top Speed 323 km/h | Chamonix Main snow race | PS3

The Delta S4, introduced in autumn of 1985, was the ultimate Group B machine. At first glance it appears to be a Lancia Delta, but the inside of this machine was nothing like the production car, and more like an "F1 road car."

The steel-pipe space frame chassis is mounted with body panels made of lightweight materials such as carbon and Kevlar. The weight of the road version is 960kg, which is unnaturally light weight for a 4WD machine.

Behind the driver's seat is the DOHC 16 valve inline 4 engine mounted in a mid-ship layout, which was highly tuned by Abarth. While the displacement is merely 1,759 cc, it is combined with a supercharger and turbocharger. For this reason it can furnish unhesitating power from low to high rpm, and with its boost pressure set to 2.5Bar, the maximum output is 449 HP and maximum torque exceeds 332.7 ft-lb. This astounding power is transmitted to the full-time 4WD system through a 5-speed manual transmission.

Right after its debut, the Delta S4 dominated 1st and 2nd place in the 1985 RAC Rally, and also showed its overwhelming power with a victory at Monte Carlo in 1986. However, the increased speeds due to the high power engines made the WRC an extremely risky sport, and there was a series of deaths caused by accidents involving spectators, breakdowns and crashes.

As a result, the FIA made a decision to hold the WRC in Group A after 1987. The Delta S4 lost its right to participate, and after only 200 road spec models and 20 Evoluzione competition models were made, its production was ceased.