Trick is:
start "dancing" at lower speeds - below 250 kph or even lower.
slide sideways and hit the wall at under, say, 100 kph.
check out the position of the skid marks below
release brakes timely so your speed in dash's speedometer (and wheels' spin, and official speed) will be close to 0-50 kph upon hitting the wall.
Get stuck, and you will see that during gameplay
get stuck, wait car disappear and reappear somewhere close by...
wait the car get released and quit to see your speed in the dash during replay (you need to play with ffw/rwd buttons to catch a glance at the "top speed" )
964; 952... tell us what you got!!