The BMW E24 series was produced during the 1976 and 1989 model years and was the first 6 Series coupe made by this automaker (http://en.wikipedia.org/wiki/BMW_6_Series_(E24)). BMW Motorsports introduced the M635 CSi in Europe in 1983. It was essentially an E24 powered by the M88 engine from the M1 and produced about 282 hp. Most of the cars were equipped with special 415 mm diameter wheels requiring Michelin TRX tires. A catalyzed, lower compression ratio version of the car with the S38 engine, producing 260 hp, was introduced in the US in 1987. 4,088 M635 CSi cars were built between 1983 and 1988 with 1,767 US M6 built.
An interesting read is the original May 1985 Road and Track Magazine article about the 1985 BMW M635 CSi, “The classic business suit bulges with more muscle” (http://www.roadandtrack.com/car-videos/performance-tests/1985-bmw-m635i-review-flashback). To quote from this Road and Track article “…… In short, the H&B M635 CSi is the BMW coupe that enthusiasts have been wanting for nearly nine years. When the 630CSi first arrived, we missed the agility of the preceding 3.0CS; now this bigger, tougher car has the power and handling to cope with any situation. It strongly impressed every member of the staff including those of less competitive bent. After all, it can go slowly very well, too. Just not very often ……”
Please find below some shots of the Schumann Motorsport BMW M635 CSi (http://www.schumann-motorsport.de/young-timer/young-timer/635) at the ADAC 24h Classic. Hope you like the photos.
Schumann Motorsport BMW M635 CSi decelerating down the hill at Brunnchen during qualifying in the rain. Was amazing how the dark and wet conditions emphasized the headlights of the car, looking like “laser beams” cutting through the darkness. Shot from bottom of the spectator area near the stairs on the outside of the track (Canon 5D Mark III, Canon 300mm f2.8L IS II with 1.4x extender III, 420mm, f/4.5, 1/1000, ISO 500)
Schumann Motorsport BMW M635 CSi braking as it goes into a corner at Hohe Acht during race day. Taken from outside of the track from the spectator elevated stand so could shoot over the catch fencing (Canon 5D Mark III, Canon 300mm f2.8L IS II, f/3.2, 1/1000, ISO 100)