What does all this mean for us non-racing, but interested parties?
If you're still interested, bracket racing is a type of drag racing that allows wildly disparate cars (both performance and cost wise) to compete on equal footing. The goal is to eliminate everything except the reaction time, consistency, and skill of the driver (and mechanic/tuner) from determining the outcome.
To achieve this, each driver initially completes several timing runs down the track, in order to establish a baseline E.T. (elapsed time) for the car. This baseline needs to reflect the best performance of the car/driver, because if you surpass this during race conditions, you "break out", and automatically lose.
Imagine your "bracket" is 11.0 to 11.03 seconds, and mine is 9.0 to 9.03. My time is much quicker, so a "flag drop" start would be to your detriment (aka....you didn't bring enough motor!).
In bracket racing, a computer controlling the start lights figures precisely (based on our bracket baselines) how much of a head start to give you, so that we arrive at the finish line simultaneously.
This diminishes the advantage of high cubic dollar performance, and renders racing back to a contest of skill and consistency.
Amateur racers, running everything from daily driver commuting cars (with a little added safety equipment) to street racers to full wood competition cars, can have a great weekend of intensely competitive racing, on the cheap.
The better reaction time, at the start line, and control of the car (staying in the racing groove, that is the sticky part of the track) will win.......
As long as you don't do everything perfectly, better than you've ever done it before, and break out!
Oh, and
@12BitSlab had a license from NHRA (National Hot Rod Association, the largest sanctioning body in drag racing) to drive a vehicle with an E.T. as low as 9 seconds in the 1/4 mile. Probably running 180~200mph as it crossed the finish line.
In NHRA you have to recertify/upgrade your license with every full second decrease in E.T. (10 to 9, to 8, to 7...etc) as well as when you step up in car classification, based on fuel used (gasser to alcohol to nitromethane). That is to be read as fast, to faster, to " Holy God, please let it end!!!"


He also held an IRL (Indy Racing League) certification, allowing him to compete in open wheeled cars, I'm guessing probably sprint cars on asphalt, or modifieds on dirt tracks.
Hope this helped.
Kentucky has a long history of racing down backroads with mason jars. The contents of those jars can also make a hot fuel for a vehicle.
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Georgia does, as well!
This was the roots of NASCAR.
Cash strapped "runners" (clandestine moonshine deliverymen) started using their hopped up mules to compete on improvised tracks, for wagers and glory!
IIRC, Richard Pryor starred in a 70's movie, "Greased Lightning" which did a credible job of depicting the story of Wendell Scott, the first black NASCAR driver, and his introduction to the sport in the post-WWII-era.