A rough guide to the difference in lap times on the 'average' circuit.
LMP1 is the base time.
F1 + 10-15
Champcar + 5-8
IRL +3-4
GP2
LMP1
F3000 -2-4
JGTC -5-7
DTM -6-8
GT1 -7-9
F3 -7-9
WTCC -18-20
Now you realise why F1 is moving to V8s and cutting downforce by 50% in 2008.
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