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      10-28-2009, 10:24 AM   #1
Jason
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Thumbs up E60 M5 CSL built by BMW for 5-series 25th anniversary

A one-off lightweight E60 M5 CSL was unveiled today at BMW's Nurburgring based prototype workshop. This car was built to commemorate the 5-series 25th anniversary. Albert Biermann, BMW M division's head of development summarized the car as "the M5 CSL we never built" (though we would have loved to see it earlier and available to the public). Source: Autocar via bimmerfile

Mechanical changes include a heavily tuned version of the M5's 5.0L V10 motor. The V10 motor has been enlarged with a longer stroke result in a total volume of 5.5L, which is the largest displacement ever featured in an official M car. The engine also now features a carbon fiber manifold, increased capacity air box and secondary oil cooler. To feed the enhanced engine, the front bumper features an extra air duct (where license plate normally attaches) to take in more air. The transmission was swapped out for the current M3's 7 speed DCT.

According to Autocar, official power and torque figures have not been released but Biermann hints the output peaks at “around 580bhp and close to 400lb ft”. That’s up from 407bhp and 348lb ft with the standard M5. No performance claims have been made for the powered-up-and-pared-down M5, but Biermann says it is “comfortably faster the standard M5’s 4.1sec 0-100km/h”.

As part of the car's weight savings diet (which shaves approximately 50kg off the standard M5's 1830kg weight), the roof is now carbon fiber, which lowers the car's center of gravity for increased handling. The interior has been stripped down for carbon fiber backed race seats up front and the rear seats were removed.

In terms of its suspension the new M5 remains close to the standard specification. “We’ve altered the mapping of the variable dampers but the geometry remains the same,” says Biermann.

As confirmed to Autocar, the new one-off M5 it has already lapped the Nurburgring in the hands of long-time BMW race driver, Claudia Huertgen, in under eight minutes, making it some 20sec faster around the legendary German circuit than the standard M5.

“It’s a lot gutsier than the standard M5,” says Huertgen, who this year drove the new Alpina M6 GT3 race car in the FIA sportscar championship. “You can sense the added drive out of corners. There’s more bottom end shove. I’m pulling over 180mph under the bridge at the Doettinger Hohe [the fastest point of the track]."

As desirable as this car may be to all of us however, this car remains a one-off and there are no plans for production.



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