The worst times I have had were with launch preload and the traction control off. The tires start to spin uncontrollably and the computer shifts to second killing my entire pass.
With preload and no traction control: 2.53 at the 60 feet mark
No preload and Traction control on: 2.19 at the 60 feet mark
Remember, the lower this numbers, the better the traction.
The reason is that the computer doesnt let the turbo boost over 5 PSI in stock mode. With the boost controller in place the turbo will go to the set pressure point. And launching with 13 PSI at the line will definitely spin the tires. With no preload it launches nicely with the boost jumping to 13 PSI in less than a second into the pass sticking you to the seat!!! <img src=icon_smile_big.gif border=0 align=middle>
Ian