1983 Audi Sport Quattro prototype

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 forced Audi to improve their rallycars for something more agile around the bends. The Audi inline 5 lies far in front of the Quattro vehicles, which gives the car understeer-characteristics, so to improve this matter, Audi shortened the original Quattro by 320mm from the B-pillar and rearwards. The result was the Sport Quattro.

Sport Quattro KW
A very early introduction of DOHC in Quattro

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.

Short prototypes
Shortening prototype, with an A1 and Sport Quattro in foreground

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 and fully electronical engine management, while the engine block is more or less the same aluminium basis as found on the rallye Quattro A1. 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 was an actual problem, or just a way for Audi Sport to get hold of more aluminium units to campaign, is uncertain – but a genuine block swap should feature a cast iron block with transferred ‘KW’ markings or simply still being blank if done by a dealership. Nevertheless, the Sport Quattro is a real driver’s car, where it superseed the Quattro also on technical setup. I.e. right hand sidemirrors were optional as it stole 2 km/h of the car’s top speed, another option were competition Ronal wheels. The suspension is height adjustable coilovers, and the handbrake is run on a separate set of calipers, to allow tail wiggling cornering.

Sport Quattro interior
Analogue instruments to 300 km/h and additional gauges

In street version the Sport Quattro delivers 306 hp by 6000 rpms. 0-100 km/h is done in 4.9 seconds, and top speed is around 250 km/h. It is a quite laggy setup, made to enable the massive K27 hybrids in competition.

All Sport Quattros features the setup of regular production, that is the following code: WAUZZZ85ZEA905***, and also a Baur build number for the extensive lightweight panel job. Official numbers states 128 cars Tornadorot, 48 cars Alpineweiss, 21 cars Copenhagen blau 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), so most of these seen are repainted. The one Piëch kept for himself also features additional, exclusive black details. I was so lucky to get a ride in it, and it truly is a remarkable Quattro.

Piëch's Sport Quattro
Limited of the limited – one of the two black Sport Quattros

All cars had left hand drive to accomodate FIA’s homologation demands of over 200 cars produced. Of the 214 cars were 164 sold to customers, 19 stayed inhouse and 22 dedicated for Audi Sport, 5 as spare parts cars, and the remaining 6 stayed with Audi AG.

Engine: inline 5, alu-block, alu-head, 20V.
Capacity: 2133 ccm by bore 79,3 mm x 86,4 mm stroke
Compression-ratio: 8.1:1
Power: 306 hp / 6000 rpms
Torque: 350 Nm / 3700 rpms

Sport Quattro Biturbo
Sport Quattro prototype…
Sport Quattro Biturbo
…running K26 biturbo

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 is apparent the Sport features a highly special 25V engine, and by doing so with a biturbo setup of two K26 turbos.

Sport Quattro
Alpineweiss beauty with motorsport wheels