His LEC CRP1 wasn't extreme in that way as Tyrell 6 wheelers for instance:

Purley's car

Front axle was moved by impact roughly 1 meter backwards!

As someone previously mentioned here, that was the biggest deceleration a driver survived ever - 179.8 G. From 108 mph / 173 km/h to zero in 26" / 66cm.
High res http://upload.wikimedia.org/wikipedia/c ... C_CRP1.jpg