The numbers that decide a run
Drag racing runs on a handful of numbers that are rarely explained properly: how thin the air is, what a time is worth once you account for it, and what actually counts as quick. These are the plain-language versions — no spec-sheet worship, no mysticism.
What is density altitude?
The one number that explains why the same car runs different times on different days — and why a sea-level track can read 3,000 ft on a hot afternoon.
Same-air correction
How two runs from different days, seasons and altitudes get compared honestly — and what correction genuinely cannot do.
What is a good quarter mile time?
Rough tiers from race car to daily, why trap speed tells you something ET does not, and why classes exist at all.
What is a good 60-130 time?
Real published figures by car, and why a roll pull measures power far more honestly than a 0-60 does.
Measuring horsepower from a run
The difference between estimating power from a timeslip and measuring it from an acceleration curve — including where the uncertainty really sits.
Start here if you're new
Read density altitude first — almost everything else depends on it. Then same-air correction, which is what turns a pile of runs made in different weather into something you can actually compare. After that, the "what is a good time" pages will make a lot more sense.
If you would rather just get a number, the calculators do the arithmetic for you.
Or measure your own car. AsyncRacing records a real pass with your phone, corrects it to standard air, and races that number against other real cars.
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