Quote:
Originally Posted by j-c-c
Not sure I completely agree with that. Are we focusing on the body squatting or the tire compressing?
The tire squat is significantly from weight transfer and the windup observed in the wrinkling/compression of the sidewall, both require movement in order to occur, and the rotation of the driven rear tire satisfies for me that "movement", regardless of when the front tire moves.
Not sure how the .400 light or rollout are pertinent here.
It should also be noted the body when seen rising due to suspension design under acceleration is pushing against tire adding tire load and compressing the tire further. The sidewall reaction/height is a useful indicator of this result.
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The way drag racing lights work and rollout is important because both allow the car to store energy before the clocks are started. The car has activated it's throttle and the transmission is engaged and things like the tire squat and suspension shift happens all while the front tire is still blocking the beam and the clocks haven't started to time the run.
Technically the car could sit there for 20 seconds and still run a 10 sec 1/4 mile pass as the time displayed is based on when the car leaves the beam. They can't win a race that way because the reaction time does count in the end. The first car across the finish line wins unless it fouled somehow. You see often, the 2 times flash up on the boards and the slower time has the win light on, because they won with a quicker reaction. The thing is the way the yellow, then green works is you can anticipate the green and dump the clutch or Trans brake before the green. You want everything to already be going and the tire to just exit the beam exactly as the light turns green not after.