Quattro S1by Cale Funderburk
ABOUT THE ART
Audi used the lenient homologation requirements to create a new rally car. All they needed for homologation was a production run of just 200 cars. There was a distinct difference though in Audi's approach as the Roland Gumpert led engineers used the existing 'urQuattro' design as a basis. The likes of Peugeot and Lancia went one step further by developing their Group B racers from the ground up around custom-built spaceframe chassis.
The all-aluminium five cylinder in-line engine was also a development of the existing design. It displaced just over 2.1 liter to slot into the three-liter class (for turbocharged engines a 1.4 equivalency factor was used). In competition trim, the turbocharged engine produced at least 350 bhp. As mentioned earlier the entire engine was mounted ahead of the front axle. Although this was not the most obvious location for the engine, it make installing the Quattro all-wheel drive system considerably easier.