A TSI track timing system mesures two speeds at the inlet and outlet if you want to call it that at the end of thje 1/4 mile (notice the 100 feet of stripes at the end of most and then it averages them out. The G tech only measures exit speed. That is why it is always higher. But the 1.4 times are usually fairly accurate.

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1999 Civic SI, Boosted and built, 12.67@112.

Gone but not forgotten.....
1998 Eagle Talon ESI, built and boosted 14.2@98
1992 Eagle Talon TSI AWD12.91@104
1992 Honda Hatch swapped and sprayed14.0@108