While the reaction time does not matter when you're test and tuning, I like to see how low I can get my reaction times.

The way I launch my Legacy is that when I see the last yellow pop up, I immediately start slipping the clutch and when I feel the car starts moving then lift my foot as fast as possible while being WOT. It takes practice so you can feel exactly at what RPM the car likes to be launched at. I don't use launch control either since my turbo doesnt take long to spool. With this launching technique, my R/T is always under .200, with my best being a .015.

I always suggest slipping the clutch a little to get the car moving as these AWD cars will bog when the track is prepped right or they will spin if the track isn't when you side step the clutch, especially when you are launching in boost.