Well...here's my two cents worth:
Use some sim tires. They're the slickest of the tires, so they'll be able to keep sliding relatively easily.
Try not to countersteer too much. When I straighten out of a turn too early, I can usually tell it was because I countersteered too much too early. So, try just using the gas/brake to avoid spinning out while using as little countersteer as possible.
You also need to enter the turn with plenty of speed. The turn's long, and you're losing momentum the whole time that you're drifting. So, you need to start out with plenty at the beginning.
Lastly, a new drift car may be in order. Different cars cater to different styles. Some people like the light little cars, others like the big heavy ones. Try out both and see how they feel in short and long corners.
If all else fails, you may want to try out a little more hp. This can help you get through the turn a bit easier, but it can make the car really uncontrollable. When on sims, I'd say to never go too far above 400 hp.
Finally.....practice more
. Track selection may be an influence here, and I'd suggest Midfield for big turns, cause it's short and has 3 big turns.
Ooh, ooh.....almost forgot.....settings! (fun, eh?) Lift the rear end a bit higher than the front. Tighten up the rear springs and stabilizer, flatten out the rear camber, and do the opposite to the front end. Most people say to dial in more LSD, but I still can't see how that stuff works....
btw.....have fun
