Note: I am aware a lot of readers will familiarize with this car as the bementioned S1 Evo 2, S1 E2 or S1E2. This is that car, but I comply with the understanding this is the actual way Audi named their car to begin with, rather than the highly FIA influenced Evo convention.

Audi Sport Quattro S1 at the 1985 IAA, Frankfurt

Not all the drivers were pleased by the shortened Sport Quattro as a heritant to the A2, especially Walter Röhrl. In many situations the predecessor did better than the new car, so Audi had to evolve the rallye Sport Quattro. The result is the winged Audi rallye Sport Quattro S1. The big setup of wings in front and rear ment better traction.

First used in Argentina 1985, and last in Portugal in 1986, these cars present the wildest version of the rallye Quattros. Chassiswise they are marked independently from the Sport Quattro series. Only 20 cars were built, whereas the last car was used in regular S1 costume in 1986 at the Pikes Peak event, and in a more extreme version in 1987 at the same event.

Engine: inline 5, alu-block, alu-head, 20V.
Capacity: 2110cc by bore 79,5mm x 85mm stroke
Compression-ratio: 7:1
Power: 476hp / 7500 rpms
Torque: 480Nm / 5500 rpms

These engines were built to do 8500 rpms, and features 2.2 BAR from their K29/K27 turbos. Different drivetrains were tested, standard with 6 speed gearbox with hydraulic operated clutch, but also the 952 sourced Porsche Doppel Kupplung (PDK) semiautomatic gearbox.

Topspeed at approx 220km/h and 0-100km/h done in 3.1 seconds.
Length/height/width 4240/1860/1343mm.

Audi Quattro S1 ‘Pikes Peak’

After the cancellation of Group B in 1986, Audi searched for another arena to display it’s Quattro cars. The Pikes Peak hillclimb in Colorado was found the most suitable one.

Michele Mouton raced to victory in 1984 & 1985 in a rallye Sport Quattro, followed by Bobby Unser in 1986 in S1 no. 20, and last Walter Röhrl in the evolution S1 in 1987, setting a new course-record at 10:47.85. The basis of the car was the S1, but it featured more aerodynamic tweaks in the shape of additional spoilers and an air duct in the roof, supporting the setup of an engine benched to 598 hp/590 Nm.

Pikes Peak S1 as few knows it, in regular S1 guise driven by Bobby Unser in ’86