this took me about 45 minutes, but i suck at driving and didnt want to take any chances.
I also did it on a win10 pc, which helps in finding a rival.
setting (basically all off):
Suggested line = OFF
Braking = ABS Off
Steering = Normal
Traction Control and Stability = OFF
Shifting = Manual w/clutch
Damage & Fuel = Fuel and Tires
Rewind = OFF
Friction Assist = OFF
Track: Indianapolis Brickyard USA under Featured Events. The way i did it, didnt take any chances, it took 3 minutes to finish the lap.
Hit Y to select your rival.
the scroll button is small, but you can drag it down. the first tim i did it, i went all the way down. there are a couple of users who had really long times. i selected the last one. the second and after times i did it, i just scrolled past my name and selected users with dirty times.
the"race" never shifted past gear one and easily (non dirty) the lap.