TC limits wheel spin and SC limits lateral movement (the violent R/L turn that leaves you looking straight the retaining wall). Remember when you are at the track, only alter one thing at a time. If you change tire pressure, launch RPM and the way you dump the clutch, you will never know which one of the variables is helping or hurting you. Practice makes perfect, and its fun! Do your research before going to the track and take notes on each pass to include: DA, tire pressure, and launch rpm at a minimum if you want to max you times. When fine tuning launch RPM remember these simple rules: Bog right after launch means you need to launch at a higher RPM. Keep upping your launch RPM by 300-500 until bog goes away. There will be a fine line between no bog and wheel spin. To keep in line with the original purpose of the thread, 13.1 at 108 w/ 2.1 60' bone stock and 12.72 at 112 w/ 1.83 60' on MT DR's.