There are alot of factors on this also, consistent lap times and trying to hit the same line everytime. Try soaking the belts in WD40 overnight to help loosen them up I did this and it helped alot. I practically run my side belt as loose as I can . I am runnning this car right now box stock with the factory setup and love it alot, biggest issue I have had is finding proper gearing for my 17.5 motor and the way that I drive I am going to start at 4.0 FDR.