Go to the pits, escape from the game and go to accelerate time. This should
now finish the grand prix in pole position. It might be that you have to do
this on the last lap.

Slip into the pits after your first lap and then simultaneously hold down
the keys that make up the word "PALIR" and press the fire button. Not only
will you be unable to crash but the game will not react as though you have
pressed 'F4'.

Race a non-championship race and keep driving untill the last lap. Then
enter the pits and drive to your pit-crew. Wait for the message "Race
over". This way you will always win the race.