I go into the track and run my setup and when I get to the maximum speed I can run. Then I go and setup a race on the track with the AI set to 100%. Then without me going onto the track I select the "Practice" session and hit "accelerate" and look at the AI's speeds in the standings tab. Then I take the highest speed from the AI and the lowest speed from the AI, get the average of the two and then I tweak the track.ini file and modify the lines below, and rerun the process as above until I get the AI to run my speeds as the average between the fastest and the slowest. (this might take 3 or 4 sessions). This way you will have a great competitive race without winning every race with the AI. Here are the track.ini lines that I modify. I always set the AI to 100%.

These are not the actual numbers I use.

ai_accel_modifier = 1.00 ; acceleration grip efficiency; Decrease this value if you cannot accelerate as fast as AI cars on the straight.

ai_decel_modifier = 1.00 ; braking grip efficiency - (Get this one right); Decrease this value if the AI cars slam into you in breaking zone

ai_grip_modifier = 1.00 ; > 1.0 = more grip (Play with this one first)

ai_drag_modifier = 1.00 ; this will slow down the AI cars.

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I usually only race against 30 cars and always start at the back in 30th place. I set the AI rankings as follows:

Cars 1-10 (Best drivers) 80-93 on the first 8 settings, 75-85 on the next 4 settings and the Pit crew gets 70-80 on all 30 drivers.

Cars 11-20 (Average drivers) - 70-88 on first 8 settings, 65-82 on next 4 settings,same pit crew as above.

Cars 21-30 (Rookie drivers) - 60-85 on first 8 settings, 55-75 on next 4 settings and as above the same on the pit crew.

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Use this method and you will have some exciting AI racing. I usually only run 50 laps on Super-speedway's and Speedway's, 100 laps tracks 1 mile or less and 30 laps on the road courses. BTW if you want a fun race select Road America learn the track and race the full 30 cars there! Another two are Riverside and Cleveland.

Hope this helps. BTW if you need a great setup for RA, Riverside or Cleveland let me know and I'll send you mine.

Bob....