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Bracket racing is a form of drag racing that allows for a handicap between predicted elapsed time of the two cars over a standard distance, typically within the three standard distances (1/8 mile, 1,000 foot, or 1/4 mile) of drag racing.
The effect of the bracket racing rules is to place a premium on consistency of performance of the driver and car rather than on raw speed, which in turn makes victory much less dependent on large infusions of money, and more dependent on mechanical and driving skill, such as reaction times, shifting abilities, and ability to control the car. Therefore, bracket racing (using the aforementioned handicapping system) is popular with casual weekend racers. Some will even drive their vehicles to the track, race them, and then simply drive them home.
This format allows for a wide variety of cars racing against each other. While traditional drag racing separates cars into a wide variety of classes based on power and weight, bracket racing classes can be simpler, and can accommodate any vehicle with basic technical/safety inspection. Race events organized in this way are sometimes called "run-what-ya-brung".
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.
When a car leaves the starting line, a timer is started for that car. The difference between when the green light comes on and when the car actually leaves the starting line is called the reaction time. If a driver leaves before the light turns green, he/she is automatically red-lighted and disqualified for that round unless the opponent commits a more serious violation (crossing a track boundary line, timing block, or touching the barrier). The first car to redlight loses, meaning, the slower car, which will be leaving the line first, has the disadvantage of being dead in the water if he red lights, even if his faster opponent redlights by a larger margin.
Sometimes, people incorrectly refer "reaction time" to the unrelated 60 foot takeoff time. The reaction time is merely an indication of how fast a driver reacted compared to when the green light came on. The 60 foot takeoff time is an indicator of how fast the vehicle started moving at the beginning of the race, regardless of the driver’s reaction time. If the driver launched the car with too much power for the available traction, he will have wheelspin and correspondingly will have a longer time to cross the 60 foot barrier if he were to drive with more finesse.
Breaking out is when a racer manages to cross the finish line in less time than the one he dialed-in beforehand.
- If only one car "breaks out", it is disqualified and the other one wins by default.
- If both cars break out, the one closer to the dial-in time wins.
- A foul start, crossing the boundary line or wall, or failure to be at post-race inspection override any breaking out violations.
- Not all bracket racing classes have breaking out (NHRA Competition Eliminator).
- Based on a driver's competition licence or a chassis certification, an absolute limit may be imposed. A car going faster than the absolute limit may be automatically disqualified.
|Race||Dial-in||Race Time||Reaction Time||Outcome||Reason|
|Driver A||16.0||15.8||0.086||Broke Out||Racer A broke out.|
|Driver B||15.6||15.9||0.219||WINS||Did not red light, nor broke out.|
|Driver C||16.1||16.0||0.280||Broke Out (WINS)||Racer C is closer to the dial-in time. (0.1 seconds)|
|Driver D||15.5||15.2||0.005||Broke Out||Racer D broke out with a wider margin (0.3 seconds), so he loses.|
|Driver E||14.9||14.9||-0.020||Red Light||Red light overrides any break out violations.|
|Driver F||15.8||15.7||0.205||Broke Out (WINS)||Break outs are irrelevant once Driver E triggered the red light violation unless Driver F crosses any boundary line, fails to present his car for inspection after the run, or in some classes, breaks out with a time faster than the absolute limit for that class (such as Junior Dragster, which has age-set limits, or chassis and licence certifications in other classes). Red lights overturn break outs, but boundary line violations overturn red light fouls. Absolute break out violations overturn all.|
|Driver G||15.8||15.4||-0.005||Broke Out and
Red Light (WINS)
|Opponent crossing boundary line overturns both a foul start and breakout.|
|Driver H||14.5||DQ-CL||0.200||Boundary Line||Crossing the boundary line is an automatic disqualification and is worse than a red light or breakout.|
|Driver G||12.5||12.50||-0.005||Red Light||Both cars committed a red light foul, only this lane is tagged under the 2016 TruStart programming, as the reaction time was worse.|
|Driver H||13.2||13.21||-0.002||WINS||Though the vehicle left first and would be tagged with a red light, under 2016 TruStart programming, the green light is shown to the driver at first. As the opponent's -.005 for the later start is worse than a -.002 reaction time, the red light is subsequently shown to that lane only.|
This eliminates any advantage from bending the rules by putting a slow dial-in time on the windshield to get a head start. However, some racers will purposely dial a slower time and then let off of the throttle or use their brakes near the end of the track in an attempt to use strategy to win the race rather than relying on the car to run the dial in.
Bracket Racing Strategy
Bracket racing boils down mainly into one thing; putting up the best "package". The best package is technically the winner in every drag race.
A "package" is : package = drivers reaction time + deviation from the dial-in.
Driver A has a reaction time of .025 and his car runs 9.653 on a 9.64 dial in. His package = .025 + (9.653-9.64) = .038
Driver B has a reaction time of .005 and his car runs 10.684 on a 10.66 dial in. His package = .005 + (10.684-10.66) = .029
In this scenario driver B wins despite his car running further off the number. But we can deduce even more than just that he won; we can see that he won by a (.038 - .029) = .009 finish margin which is about 22 inches at about 140 mph.
The formula used to calculate the margin of victory is :
17.6 * finish margin * behind vehicle mph = finish margin in inches
Professional(and some amateur) Bracket Racing has evolved over the years into a drivers sport. It used to consist of trying to get a good reaction time then hoping the car ran near the number. Drivers would avoid breaking out like the plague, dialing their car's .01 faster than it had ever gone before.
Now it has turned into a chess match between two drivers, guessing each other's next move. The race starts in the staging lane where you get ready to race, where you decide what dial in to put on your car. This is arguably the most important part of a bracket race : making sure you can "run the number". In other words, make sure you can go as fast as your dial in says you can. Everyone has a different strategy, but any strategy has its flaws and can be beaten; that why the best strategy is one that includes many different strategies and cannot be predicted.
Red Light and other fouls
If a car leaves the starting line before the green light comes on, a foul is recorded (a red-light start), and that car is provisionally disqualified. Traditionally, only the first car to foul start is shown the red light; an automatic green light is shown in the other lane at the appropriate time. Starting in 2016 in selected races, a new programming function will initially show a green light to the first car, even if the driver committed a foul start. Once the second driver leaves, only the driver whose reaction time was worse, provided the reaction time is negative (meaning a foul start), will have their lane subsequently show a red light (left lane -.021 and right lane -.020, red light on the left lane only). Another form of foul is to cross the dividing line between the two lanes, or the line at the edge of the racing surface, both of which negates a red light foul. A foul is worse than a break out; one car can break out but if the other car fouls, the car that breaks out advances to the next round. If both cars foul, the lesser of the violations is the winner; a break-out is the least serious violation, then a red light, crossing the boundary line at the edge of the surface, crossing the dividing line between the lanes, leaving before the tree is started, and then absolute breakout (if a car goes faster than its legal certification limit, and the driver is not certified to be in a faster car, such as a Top Dragster driver going 5.99 seconds in a chassis not certified as a Top Alcohol Dragster and the driver's competition licence is not a Top Alcohol licence or a car certified for 7.50 to 8.99 goes 7.49 seconds, and the driver's licence is only certified for cars slower than 7.50 seconds; in Jr Dragster, for example, an eight-year old driver goes faster than the age limit of 11.50 in the eighth mile).
Both cars are disqualified in double fouls if both competitors cross either boundary line (edge of surface or dividing lane between lanes). Only one car is disqualified if both competitors commit different fouls of the other type. Both drivers are disqualified if they leave before the tree is started, but if video evidence can show which of the two drivers left first, only the first driver is disqualified. In a double disqualification in the final on boundary lines, only the first driver to cross the boundary line will be tagged.