Here is what you will typically find under the hood of most of the pro's cars, depending on motor manufactuer, track size, track conditions, and of course personal preferance--
2WD Car- Turn range> 10-16 Strand range> x2-x4 Most often used- 12x2
2WD Truck- Turn range> 9-12 Strand range> x1-x2 Most often used- 10x2
4WD Car- Turn range> 8-11 Strand range> x1-x3 Most often used- 10x2
Remember, depending on your skill, you may want a lesser wind. 90% of the time when someone is having trouble staying clean, a slower motor will fix the problem.