The Audi Sport Quattro was manufactured february 1984 until january 1986. It’s engine was the infamous “KW” 2133 ccm (79.3 x 86.4 mm), Audi’s first 4-valve engine, performing a healthy 306 hp / 350 Nm, built on an aluminium block and head, 8.1:1 compression-ratio, K27 turbo.
The fierce competition in Group B in the mid-80s forced Audi to improve their rallycars. The result was the Sport Quattro, a 320mm shortened urquattro, more suitable for the twisty bends. The Audi inline 5 lies far in front of the Quattro vehicles, which gives the car understeer-characteristics. To improve this matter, Audi shortened the original Quattro by 320mm from the B-pillar and rearwards.
Other changes was the use of a more upright windscreen (like the typ 81 Audi 80 2-door version) to avoid reflections, a ventilated bonnet and a one-piece grille in black surrounding the headlamps. All chassis parts were built especially for the Sport, most of them in lightweight materials. The exception are the steel doors taken from the beforementioned Audi 80. Hatch was in glassfibre, while the remaining was by GRP composite.
The official number of Sport Quattros built are orignally 214, but some were finished out of spare chassis parts released in 1988. It is the Quattro car that introduced the 20V engine, while the engine block is more or less the same aluminium basis as found on the rallye Quattro A2. These are said to be prone to cracking, so it is not unusual to find a Sport Quattro featuring the more standard cast-iron block with a comment it was changed by the dealership. If this is an actual problem, or just a way for Audi Sport to get hold of more aluminium blocks, is uncertain – but a genuine block swap should feature a cast iron block with KW markings or simply still being blank. Nevertheless, the Sport Quattro is a real driver’s car, i.e. right hand sidemirrors were optinal as it stole 2 km/h of the car’s topspeed. Other options were competition Ronal wheels.
In street version the Sport Quattro delivers 306 hp by 6000 rpms. 0-100km/h is done in 4.9 seconds, and topspeed is around 250 km/h.
All Sport Quattros features the setup of regular production, that is the following code: WAU ZZZ 85 ZEA 905***,
128 cars Tornadorot, 48 cars Alpineweiss, 21 cars Copenhagenblau and 15 was Malachite grün. Additional 2 cars was given the special black metallic, as it was Ferdinand Piech’s favourite color (IN-NJ 99 and IN-NY 88). The one he kept for himself also features additional, exclusive black details.
All cars had left hand drive to accomodate FIA’s homologation demands of over 200 cars produced. Of the 214 cars was 164 sold to customers, 19 stayed inhouse and 22 dedicated for Audi Sport, 5 as parts cars and the remaining 6 stayed at Audi AG.
Engine: inline 5, alu-block, alu-head, 20V.
Capacity: 2133 ccm by bore 79,3 mm x 86,4 mm stroke
Power: 306 hp / 6000 rpms
Torque: 350 Nm / 3700 rpms
I am not familiar with the circumstances, but these images appeared on the internet some years back, revealing the Sport Quattro has been a rather interesting test bench and/or mule for different setups. In these two photos, it i apparent the Sport features a. the highly special 25V engine, and b. doing so with a biturbo setup of two K26 turbos.