Defining bracket racing.
https://en.wikipedia.org/wiki/Bracket_racing
This is from Wikipedia.
Dial-in[edit]
Each car chooses a dial-in time before the race, predicting the elapsed time the driver estimates it will take his or her car to cross the finish line. This is usually displayed on one or more windows so the starter can adjust the "christmas tree" starting lights accordingly. The slower car in the race is given the green light before the faster car by a margin of the difference between their two dial-in times.
In principle, if both drivers have equal reaction times and their cars run exactly their posted dial-ins, both cars should cross the finish line at precisely the same time. In reality, this is an extremely rare occurrence. Measuring devices both at the start and at the end of the track post times down to 1/100000 of a second (0.00001s precision), which makes tied races almost impossible.
Some forms of bracket racing (NHRA Competition Eliminator, NHRA Stock groups) have cars classified by type, and the dial-in time is based on the type of car that is entered.
Jeff