Rollout of TAFC

Hi,

I am trying to set up my port a tree to use for a TAFC. Car goes .920 to .940 in the 60ft and weighs 2265. Our lights are normally .020 or better (often -.01ish too) when just going on the amber. Im pretty sure that the cars not going in deep, as the 60ft times are still good. Also, is there a way of telling how deep the car is in stage? Like some kind of formula to relate 60ft time to how many inches in stage?

Any help is greatly appreciated.

 

How deep.............

Stick your head out the window!!!!!!!