If you have suitable input or information, please post and I´ll update the list (and if anybody allready has such a list, then:
Changes to the Le Mans track and how they affected track times:
Year KM Changes Effect on lap time
1923 1 17,262
1929- 2 16,340
1932- 3 13,492
1950 - new "non-skid" pavement
1956- 4 13,461 modified pit straight and Dunlop curve (Dunlop-curve faster) (if anything, faster?)
1968- 5 13,469 new Ford chicane before pits +9-12s claimed by drivers
1972- 6 13,640 new bendy sections past White House, +one more chicane at Ford (+c17s +/-, from comparing times) other suggestions?
1979- 7 13,626 Tetre Rouge corner re-profiled (faster, but more complex) (slightly faster?)
1986- 8 13,528 Mulsanne corner altered (slightly faster?)
1987- 9 13,535 Dunlop chicanes (new chicane before Dunlop bridge) (+c4s +/-, from comparing times) other suggestions?
1988- - M Straight resurfaced, much smoother, less bumpy =higher max speeds slightly faster
1990- 10 13,600 Mulsanne chicanes, new slower pit entrance (+c14s +/-, from comparing times) other suggestions?
1997- 11 13,605 Dunlop chicane layout slightly altered (reprofiled) (stated to be slightly slower)
2001- - lower "Mercedes hump"
2002- 12 13,650 New bends between Dunlop bridge and the Esses (must be slower)
2007- 13 13,629 Dunlop chicane tightened estimated to raise lap times by 1,5s
Someone behind the Olympia Charger webpage computed that cars were slowed by 7,9% (prototypes) and 7,7% (GT cars) from 1972 track to 2002 track.
Someone calculated that 2006 cars on the 1956-68 track would have done a 2,43 best lap, and run 66-6700km during 24 hours.
I´ve gleaned at the Le Mans Classic 2008 lap times, a speculative source as car state and driver temperament makes a big difference. Most 1949-67 cars are more than 1 minute slower (anything from 30s to 1m34s) than originally, heavier cars being most affected.
(Sorry, the spaces disappeared when posted, making a mess of the post. Hope you can see the meaning behind it...)
Edited by XJ13, 07 May 2010 - 20:22.