1: Make sure you have the best tires allowed equiped.
2: Make sure you reduced the weight and added race suspension.
3: Use a driver who is Blue or Green not Orange.
4: During the Daytona race keep telling him to pace up and overtake until he gets to the front and when his bar starts to drop do not let it go into the blue area. Keep it a little above center with pace up or maintain pace instructions.
5: Edit also if he starts loosing it in the corners tell him to pace down a bit, and be careful how fast you pace him on Laguna Seca or he will be smoking the tires in the corners.