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BMW 850CSi
08/1992 - 11/1996, V12 (S70), 5.6l displacement, 380 hp, number: 1510
As expected, the 850CSi makes no exception in having several names. In this case, the term M8 is mentionned on and on again. And it's correct. The 850CSi is a real M-car. It does not only have an M-bred engine (type S70, the S indicates M-origin) but has been manufactured by BMW M as well, according to the VIN which starts with WBS (BMW Motorsport) instead of WBA (BMW AG). This is mentionned in the papers as well. But although the papers say that the correct model name is BMW M8, the car has been enhanced only moderately by the M-Division, compared to the real M8, which remained a prototype only.
Here are the papers of a BMW 850CSi:

Only 1510 units of the BMW 850CSi were built from August 1992 until october 1996. Because of stricter emission guidelines from January 1997 on, the production of the 850CSi ceased as further development, because of the few cars sold, would have been too expensive. So it has the same destiny as the Aston Martin V8 Vantage. By the end of 1996, all dealers still having a CSi, were instructed to license them - and if it was for one day only - because with the new guidelines it would have been impossible to do.
Specification Extras that were 'standard' in every 850CSi
Euro USA
× × Engine S70B56
× × 6-speed manual (automatic not as an option)
× × Final drive ratio 2.93:1
×
Final drive oil cooler
×
Engine oil cooler
× × Stiffer suspension (No electronic damping control available)
× × Chassis lowered 15mm
× × Servotronic, motorsport specific
× × Limited slip differential
× × Automatic Stability Control + Traction (ASC+T)
× × Aluminium wheels with brake ventilation
×
Active rear axle kinematics, motorsport specific
× × Electric steering wheel adjustment
×
Stronger brakes
× × Upgraded front and rear spoiler
×
M-design door mirror
× × Dashboard with red pointers and different looks
× × 850CSi-badge
× × Folding rear seat backs and ski bag
×
M-Interieur (Bicolor)
× × Leather seats
× 'BMW Motorsport' written on doorhandles
× × ///M emblem embossed in lower door frame
The hydraulic four-wheel-steering
Maybe what makes the 850CSi most special was the Active Rear-Axle Kinematics system which was standard on all Euro CSis. It's abbreviation (AHK) is the abbreviation of the german expression for it (Aktive Hinterachs-Kinematik). While normal passively steering rear axles allow the wheels to be slightly turned by the forces acting on them when cornering, the hydraulics of the AHK turns in the rear wheels before those forces build up. The AHK is therefore a real for-wheel-steering system!
From a speed of about 60 kph (37 mph, BMW doesn't disclose the correct numbers) and up, a computer controlled hydraulic system steers the rear wheels depending on the turn angle of the front wheels. All four wheels then turn into the same direction, minimize weight shifts (the CSi weighing almost two tons even beats Turbo-Porsches in lane change maneouvers) and even allow steering adjustment in a curve to an extent that would inevitably cause you to crash in any other car. According to various sources the maximum angle the rear wheels turn is between 1.5 and 2.5 degrees (again, BMW doesn't tell).
With the introduction of the CSi the Active Rear-Axle Kinematic was also on the option list for the normal 8 series. But the additional amount of money you had to pay was 6400 Euros (DEM 12500), so a non-CSi with AHK will belong to the rarest things on this planet.
Here you will find detailed technical data.
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Tegu seega 850CSi-ga ikkagi.