From rennlist.com re launch control from one of the posters there:
Launch Control (racing start function):
Stress on components increases significantly when driving off at maximum
acceleration in comparison with driving off "normally". In addition, there is a high
temperature burden on the components in the clutches. To protect the components
in this case, this function is disabled for a distance of 1.5 miles (2,5 km)
after a racing start. During the 1.5 miles (2,5 km) drive, the clutches are cooled
with the maximum cooling volume flow.
http://forums.rennlist.com/rennforums/997-forum/521538-my-10-seconds-or-less-of-exhiliration-with-launch-control.html
(see post #12)
That doesn't sound right; implies that you cannot re-engage (get back into) launch control mode, unless having driven 1.5 miles, after having been in 'Launch control' mode- i.e. not as demo'd at Silverstone??
(Or maybe it was cold when we did it, and it's a clutch temperature limitation that decides whether the mode can be engaged- is this temperature monitored in any way?)
Andy L-T