Well, it may depend on your driving too. NASCAR's are very throttle sensitive. You may have to adjust your LSD as well. When your in the center of the corner, start rolling on the throttle lightly, as you start to straighten the wheel, roll into the throttle more. If you can, without losing time and speed, adjust your line to where you in a way diamond the corner. That way, in the center of the corner, you can be on the throttle a lot more and have the wheel straighter, therefore giving you more speed up off the corner.
Hope this helps!