Audi Quattro A2 (Gr.B)
Lighten up, slim down
The rallye Quattro A2 was a direct development of the Quattro A1, but homologated to fit the new version of Group B regulations. That held a turbo factor at 1.4, pushing for a reduction of the displacement to 2133 cc. Motorentechnik Lehmann built an engine with a shorter stroke and a wider bore than class criteria, giving it 2110 cc and a FIA-displacement of 2954 cc. Most A2s used both the K26 and K27 turbos as the A1s did, but a new manifold and K27 turbo setup was used on the very last cars.
Overall, the A2 had finally became a rather agile, lightweight (for a Quattro!) rally car, thanks to the chassis perfection built at Matter & Obermoser. At the most, I know of a purpose-built hill climb A2, weighing in at a mere 920 kg only!
Engine: inline 5, alu block, alu head, 10V.
Capacity: 2110 cc by bore 79,5 mm x 85 mm stroke
Power: 360 hp / 7000 rpms
Torque: 450 Nm / 4000 rpms
Kevlar fenders, while bonnet, hatch, doors and side windows were made of plastic. Noticeable by two vents in rear fenders, and wider fenders
allowing up to 11″ wheels. First used at Corsica 1984 and last in RAC 1984.
0 – 100 km/h in approx 4.5 seconds, when gearing is set to top speed at 185 km/h – same as Quattro A1.
Although all A2s had the 10 valved alu-engines, there is also rumored there was one car featuring the new 20V engine later found in the rallye Sport Quattro. I have never gotten around to seeing any evidence of it, but it is highly plausible some rallye Quattro A1 or A2 would run as a R&D platform for the Sport Quattro.