try dropping your susp.settings to there minimum, push your Auto setting to the max and the final ratio all the way to the left (to the lowest number possible), move down force on the front to the minimum and the rear to the max
sometimes the gear ratios may need playing with, depends on preferance
the best cars to do this with are the MR cars eg GT1-race car, R390 race car etc...and also the escudo
hope this helps
cheers
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