An NHRA timing slip is a record of how a run unfolded: reaction time (RT), elapsed-time intervals, finish-line elapsed time (ET), speed, lane and result. Read it in that order, and keep two rules in mind: RT is the driver’s response to the starting signal, while ET is the vehicle’s time from leaving the staging beams to the finish; and every figure is meaningful only when you know the finish distance and class.
The layout and abbreviations can vary by track, but the timing concepts below are the standard NHRA definitions. A local slip with an unfamiliar abbreviation should include a legend, or the track’s timing staff can identify it.
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What an NHRA timing slip records
NHRA defines a time slip as the post-run record given to a racer or crew. It normally lists reaction time, interval times, elapsed time and speed, along with lane and run-identifying information printed by that facility. Each lane has its own elapsed-time clock. The clock starts when that vehicle leaves its staging beam and stops when it reaches the finish line.
That independent timing is why you must not treat RT and ET as one number. RT covers the launch response after the green signal; ET covers the vehicle’s measured run after it leaves the staging beams. A car can have a quicker ET but lose the race if its driver reacted later.
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The fields at a glance
| Slip field | What it measures | How to use it | Important qualification |
|---|---|---|---|
| RT or reaction | Time for the front tires to clear the staging beam after the green signal | Evaluate the driver’s launch response and red-light status | It is not included in the vehicle’s ET clock; NHRA’s current perfect reference is .000 |
| 60-foot | Elapsed time to the first 60 feet | Judge the launch portion of a pass | NHRA calls it the most accurate measure of launch; it does not by itself identify the cause of a poor launch |
| 330, 660, 1,000 and 1,320 | Cumulative elapsed time from the starting line to each named marker | Find where a run gained or lost time | These are cumulative readings, not individual segment times |
| ET | Elapsed time from leaving the staging beams to the finish line | Compare the vehicle’s performance over the same distance | An ET is comparable only when finish distance and class context match |
| MPH or speed | Speed measured in a short trap ending at the finish line | Assess late-run speed alongside ET | NHRA’s documented trap is 66 feet; this is not the car’s speed throughout the pass |
| Lane and result | Which lane produced the slip and who was credited with the win or foul | Connect the numbers to the actual race | Category rules and red-light decisions can affect the result |
Read the slip in the right order
- Confirm the run identity. Find the date or run number, class, car or driver identifier, lane and any win, loss or foul notation. Do not compare a qualifying pass with a different class or a different race distance simply because the slip design looks similar.
- Check the finish distance. Determine whether the run ended at 1,320 feet (a quarter-mile) or 1,000 feet. NHRA’s 2023 media guide describes a 1,320-foot racing surface, while Top Fuel and Funny Car are documented at 1,000 feet. Those classes moved from 1,320 to 1,000 feet beginning in 2008, according to NHRA’s 2025 history. A 1,000-foot ET and a 1,320-foot ET are not directly comparable.
- Read RT separately. A positive value generally means the car left after green. NHRA’s current convention calls .000 a perfect reaction time. A negative value, such as -.001, denotes a red-light foul in the documented NHRA convention; it is not an exceptionally good reaction.
- Read the 60-foot number. This is the first launch checkpoint. A slower 60-foot time than another pass by the same car means less time was made in the first 60 feet, but the number alone cannot tell you whether the cause was traction, power delivery, driver technique or another setup factor.
- Read the intermediate intervals as cumulative times. Locate 330, 660 and, where printed, 1,000 and 1,320. Each value is the total elapsed time from the starting line to that marker. It is not the time spent only between the previous marker and this one.
- Read ET with its distance. ET is the vehicle’s elapsed time from leaving the staging beams to the finish line. Lower ET means the vehicle covered that particular measured distance in less time. Never remove or add RT when interpreting the ET field.
- Read MPH as a finish-area measurement. NHRA measures speed over a 66-foot trap ending at the finish line. It represents late-run speed over that short section, not a speed reading at every point and not automatically the highest speed reached during the pass.
- Check the result and lane. In a heads-up race, the vehicle that reaches the finish first wins subject to the category’s rules. A driver can win with the slower ET when a better reaction gets that car to the finish first; NHRA calls that a holeshot win.
Reaction time: the number before the ET clock
Reaction time starts with the green signal and ends when the front tires clear the staging beam. It describes the driver’s response at the start, not the car’s acceleration over the full distance. Because each lane’s ET clock starts when its vehicle leaves the staging beam, the driver’s response is not folded into the printed ET.
NHRA’s present reference for a perfect light is .000. Older slips and explanations may use a .400 reaction-time base; NHRA’s historical account says the base changed from .400 to .000 in 2003. That historical difference matters when you compare old paperwork with current slips.
A positive RT is normally a launch after the green light. A negative RT is used in NHRA’s documented convention to show that the vehicle left before green and incurred a red-light foul. Treat the sign as a race-status issue, not merely as a performance ranking.
Why RT and ET can point in different directions
Suppose two cars run the same distance. Car A records a .050 RT and a 9.20 ET; Car B records a .020 RT and a 9.24 ET. Car A is quicker after its own ET clock starts, but Car B reacted .030 second sooner. In a heads-up finish, that earlier response can put Car B at the stripe first, producing the holeshot win. The example illustrates race order; it does not turn RT into part of Car B’s printed ET.
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60-foot, 330-foot and other interval readings
The 60-foot time is the first checkpoint and the clearest single indicator of how the launch went. NHRA’s glossary describes it as the most accurate measure of the launch from the starting line and the interval most critical to a quick ET. Use it to compare passes by the same car under reasonably similar conditions, not as a stand-alone diagnosis.
NHRA’s 2023 media guide lists standard timing locations at 60, 330, 660, 1,000 and 1,320 feet. The 330-, 660- and 1,000-foot values are cumulative elapsed times, just like the 60-foot value. A 660-foot reading of 6.10 seconds means 6.10 seconds have elapsed from the start to 660 feet; it does not mean the car took 6.10 seconds to travel only the section after 330 feet.
Calculating time through a segment
Subtract the earlier cumulative reading from the later one. For an illustrative 1,320-foot pass, a slip might show the following values:
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|---|---|---|---|
| 60 feet | 1.50 seconds | 1.50 | 1.50 seconds from the start to 60 feet |
| 330 feet | 3.95 seconds | 3.95 − 1.50 | 2.45 seconds from 60 to 330 feet |
| 660 feet | 6.10 seconds | 6.10 − 3.95 | 2.15 seconds from 330 to 660 feet |
| 1,000 feet | 7.85 seconds | 7.85 − 6.10 | 1.75 seconds from 660 to 1,000 feet |
| 1,320 feet | 9.20 seconds | 9.20 − 7.85 | 1.35 seconds from 1,000 to 1,320 feet |
The figures in this table are an arithmetic example, not a typical-performance claim. The useful method is the subtraction: compare each segment with the equivalent segment on another comparable pass to see where the cumulative ET diverged. A slower 60-foot value points to time lost early; a similar 60-foot value with a larger difference by 660 or 1,000 feet points to a later part of the run. The slip alone still cannot identify the mechanical reason.
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ET and the finish line
ET is the vehicle’s elapsed time from the starting line, after it leaves the staging beams, to the finish line. Lower ET means less elapsed time over that run’s measured distance. The finish distance must remain attached to the number: a 9.20-second 1,320-foot pass and a 7.85-second 1,000-foot pass are measurements of different lengths and cannot be ranked as though they were the same event.
ET also depends on the run context. Weather, track condition, vehicle setup and an interrupted or lifted pass can change what the number means. Use the lane, class, distance and run status printed on the slip before drawing a conclusion from a small ET difference.
MPH: what the speed number really means
NHRA’s documented speed measurement covers a 66-foot trap that ends at the finish line. MPH therefore describes the vehicle’s speed over that final trap, not its speed at the launch, at half-track or at every point along the strip. It is also not automatically the car’s maximum speed during the entire run.
Read MPH with ET and the intermediate times. Two passes can have similar ETs but different finish-trap speeds, or similar MPH values with different ETs, because the car may have made time in the launch or earlier intervals. MPH by itself does not prove a particular mechanical fault, gearing problem or power-delivery issue; the available timing figures show where the elapsed-time difference appeared, not why it happened.
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Why race distance and class come first
NHRA’s documented quarter-mile distance is 1,320 feet. In the configuration described by the 2023 media guide, Top Fuel and Funny Car finish at 1,000 feet. NHRA’s 2025 history records that those two classes changed from 1,320 to 1,000 feet beginning in 2008.
That distinction changes every downstream figure: the final interval, ET, MPH trap location and the meaning of a comparison. Before comparing two slips, confirm all of the following:
- Both runs use the same finish distance.
- Both vehicles belong to a comparable class or category.
- The slips are from the same type of run, such as qualifying or eliminations, when that context matters.
- Neither pass is marked as lifted, interrupted, aborted or otherwise outside a normal completed run.
Rules and configurations can change by event or season. For a specific NHRA event, use the current event information and rulebook rather than assuming that every class or facility uses the same finish point.
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A disciplined way to compare two passes
- Normalize the context. Match finish distance, class, lane conditions and run status before looking at the numbers.
- Compare RT. Use it to evaluate the driver’s start response and to identify a possible red-light foul. Do not mix it into ET.
- Compare the 60-foot readings. This shows whether the launch portion was quicker or slower.
- Compare cumulative 330-, 660- and 1,000-foot readings. Find the first checkpoint where one pass separates from the other.
- Compare finish ET. This is the total vehicle time over the shared distance.
- Compare MPH last. Use the 66-foot finish trap as supporting information about late-run speed, not as a replacement for ET or the interval readings.
For each checkpoint, subtract one pass’s cumulative time from the other’s. The first meaningful delta tells you where the time difference appeared. If the difference is already present at 60 feet, it began in the launch portion. If the 60-foot values are close and the gap grows later, the change occurred farther downtrack. Track condition, weather, setup changes and driver decisions can all affect those deltas, so the arithmetic locates the difference without diagnosing its cause.
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When the result and ET seem to disagree
In a heads-up race, the finish order is determined by who reaches the finish first under the category’s rules, not simply by whose printed ET is lower. RT changes how far a car has traveled relative to the green signal before the ET clock begins. That is the basis of a holeshot win: the driver with the better reaction can win despite recording the slower ET.
A negative RT requires separate attention because it indicates a red-light foul in NHRA’s documented convention. A slip can therefore show a very quick ET while the result is lost through the starting-line foul. Always read the result, RT sign and ET together.
What to do when a slip uses unfamiliar abbreviations
NHRA’s core definitions explain RT, 60-foot, interval ETs, finish ET and MPH, but not every local timing-system field. Tracks may print additional run identifiers, status codes or provider-specific abbreviations. Do not infer a meaning from the position of a number alone. Check the slip’s legend, the facility’s published explanation or ask timing staff to identify the field before using it in a comparison.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteAlso check whether a number is cumulative. If a local slip labels a reading only with a distance, determine whether it follows NHRA’s interval convention or represents a segment time. A segment value should not be subtracted again from another segment value; subtraction is for converting cumulative readings into segment times.
A practical checklist
- Identify the lane, class, run and result.
- Write down the finish distance beside every ET.
- Read RT as a starting response, with .000 as NHRA’s current perfect reference.
- Treat a negative RT as a red-light indication in the documented NHRA convention.
- Use 60 feet to assess the launch.
- Keep 330-, 660-, 1,000- and 1,320-foot readings as cumulative values unless the slip says otherwise.
- Subtract adjacent cumulative readings to calculate time through a segment.
- Interpret MPH as the speed over the final 66-foot trap.
- Compare only runs with matching distance and relevant class and run context.
- Use timing staff or the local legend for fields not defined on the slip.
The Bottom Line
Read an NHRA slip from the start outward: verify distance and class, separate RT from ET, use 60-foot and cumulative intervals to locate where time changed, then interpret finish ET and the 66-foot-trap MPH in context. That sequence prevents the most common errors—treating RT as part of ET, comparing 1,000-foot and 1,320-foot runs, or assuming MPH explains the whole pass.
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