XR8 Sprint vs Clubsport LSA drag race video

[Mercury Bullet]

Originally Posted by 2242100

Keep in mind that at the Dragstrips with their timing systems, some cars can get up to 15-16 inches of rollout before the timing gear knows that the car has started moving, so that commonly means a better time.
I used my Racelogic GPS based Performance Box (the same model that Motor has been using) when I ran my stock (untuned) FG XR6 T Auto at WSID. The Performance Box times are listed below followed by the Dragstrip measured times for each run (note too that the GPS unit was shown to very accurate when I compared it's times from 60 feet to the end of the run where there was no rollout to distort the times).

The US military change the accuracy of the GPS system on a minute by minute basis.
They are never accurate, unless you're in the military or high-end commercial aviation.
Accurate GPS cannot be bought off the street.

It might be accurate one minute, the next minute it could be out by 50 metres.
It can also depend on how many satellites you can see at any one time.