(I searched for this and didn't see it anywhere.)
If you're having trouble qualifying first (due to certain opponents), or having trouble getting 1st in a particular race, do this:
During qualifying, once you pull out of the pits, stop. Wait for that specific car. The fastest car has always been the first, second, or third car to blast by me coming out of the pits. Once you see that car, gun it. Stay behind him. Before the practice lap is over, SABOTAGE that car's qualifying lap by bumping
him from behind when he slows down for a sharp turn. That will knock him all the way to the back of the pack once you qualify first. 
~~~~~~~~~~~~~~~
Yes, yes, I know. Not very realistic or even very strategical, but the only time I've used this so far, is in the GTWC. I was in the Minolta Toyota race car, and there was another Minolta Toyota race car that would always qualify second. A couple races, he beat me (though not enough times for me to lose the series).
*shrug* Poor sportsmanship at its finest.
If you're having trouble qualifying first (due to certain opponents), or having trouble getting 1st in a particular race, do this:
During qualifying, once you pull out of the pits, stop. Wait for that specific car. The fastest car has always been the first, second, or third car to blast by me coming out of the pits. Once you see that car, gun it. Stay behind him. Before the practice lap is over, SABOTAGE that car's qualifying lap by bumping
~~~~~~~~~~~~~~~
Yes, yes, I know. Not very realistic or even very strategical, but the only time I've used this so far, is in the GTWC. I was in the Minolta Toyota race car, and there was another Minolta Toyota race car that would always qualify second. A couple races, he beat me (though not enough times for me to lose the series).
*shrug* Poor sportsmanship at its finest.