Scene 4 of Season 3 episode 7 (Well-Aged Scotch)
I found that the constantly tapping X (handbrake) on the straights method wouldn't work for me in this car, so instead i tried to keep full power and take the corners wide for long drifts.
Try to keep as much speed as you can, take the corners wide and aim for at least 100m drifts per corner.
(As McLustig suggested you shouldn't hold X to drift but simply tap X quickly and repeatedly while you go round the turn, this will hold the drift longer for more points).
(You might be able to get this achievement on the next scene of drifting but you need 1000m for gold so might as well try to get an extra 50m for the achievement)