BoP Lab / Classes / FC
FC pace at every track
Lap times across years say as much about the weather as the class. % of the field is each class's best lap as a share of the field's on the same day (every class that ran that day but the ones shown, each scaled by its usual pace against SM and averaged, with each shown class's own track character taken out, so one figure reads the same across years and tracks), so the conditions drop out: 100% is level, less is quicker, and a move in it is the class getting faster or slower against the field.
Closest to the field: FC 80.6% of the field Simon Sikes, Indianapolis Motor Speedway Runoffs 2021 race
| Event | FC | |||||
|---|---|---|---|---|---|---|
| Qual best | Race best | Trap | % of the field | |||
| Road America Runoffs 20262026-09-28 | 2:10.686Brandon Dixon · fastest of 10 · top 5 within 4.0s-0.573s (-0.44%) | 2:11.389Brandon Dixon · fastest of 10 · top 5 within 2.7s-1.435s (-1.08%) | 143.3Dean Kiriluk-1.8 mph (-1.2%) | 82.7%qual 82.4% | ||
2 rule changes (FC: 2)1 weight · 1 othershow | ||||||
| Road America Runoffs 20252025-09-29 | 2:11.259Brandon Dixon · fastest of 10 · top 5 within 2.7s-0.367s (-0.28%) | 2:12.824Brandon Dixon · fastest of 9 · top 5 within 2.3s+1.290s (+0.98%) | 145.1Brandon Dixon+0.9 mph (+0.6%) | 83.3%qual 83.0% | ||
2 rule changes (FC: 2)1 tyres & wheels · 1 weightshow | ||||||
| Road America Runoffs 20242024-10-01 | 2:11.626Timothy Minor · fastest of 10 · top 5 within 1.3s-1.018s (-0.77%) | 2:11.534Michael Varacins · fastest of 9 · top 5 within 1.8s-2.074s (-1.55%) | 144.2Michael Varacins+1.8 mph (+1.2%) | 83.1%qual 83.6% | ||
2 rule changes (FC: 2)2 weightshow | ||||||
| Virginia International Raceway Runoffs 20232023-09-23 | 1:50.281Nolan Allaer · fastest of 11 · top 5 within 2.3s+0.386s (+0.35%) | 1:51.169Nolan Allaer · fastest of 11 · top 5 within 2.5s-16.690s (-13.05%) | 143.5Robert Allaer+2.3 mph (+1.7%) | 82.7%qual 82.8% | ||
3 rule changes (FC: 3)1 engine · 1 tyres & wheels · 1 weightshow | ||||||
| Virginia International Raceway Runoffs 20222022-09-24 | 1:49.895Nolan Allaer · fastest of 12 · top 5 within 1.5s-1.305s (-1.17%) | 2:07.859Nolan Allaer · fastest of 13 · top 5 within 3.8s+15.685s (+13.98%) | 141.2Tim Minor-0.6 mph (-0.4%) | 86.0%qual 82.9% | ||
5 rule changes (FC: 5)3 engine · 1 tyres & wheels · 1 wordingshow | ||||||
| Indianapolis Motor Speedway Runoffs 20212021-09-25 | 1:36.787Trent Walko · fastest of 31 · top 5 within 1.7s+0.451s (+0.47%) | 1:36.980Simon Sikes · fastest of 31 · top 5 within 2.0s+0.090s (+0.09%) | 141.6Tim Minor | 80.6%qual 83.1% | ||
1 rule change (FC: 1)1 weightshow
| ||||||
| Road America Runoffs 20202020-10-02 | 2:12.644Robert Allaer · fastest of 13 · top 5 within 2.1s | 2:13.608Robert Allaer · fastest of 11 · top 5 within 1.2s | 142.4Robert Allaer | 83.3%qual 83.6% | ||
| Virginia International Raceway Runoffs 20192019-10-05 | 1:51.200Robert Allaer · fastest of 10 · top 5 within 3.1s | 1:52.174Robert Allaer · fastest of 9 · top 5 within 2.7s | 141.8Robert Allaer | 82.4%qual 83.8% | ||
2 rule changes (FC: 2)2 weightshow | ||||||
| Sonoma Raceway Runoffs 20182018-10-10 | 1:32.571Timothy de Silva · fastest of 16 · top 5 within 1.8s | 1:34.053Mitch Egner · fastest of 12 · top 5 within 1.6s | 133.1Robert Armington | 81.4%qual 83.3% | ||
| No rule changes on record between these events | ||||||
| Indianapolis Motor Speedway Runoffs 20172017-09-25 | 1:36.336Austin McCusker · fastest of 14 · top 5 within 2.3s | 1:36.890Tim Minor · fastest of 14 · top 5 within 3.8s | 82.4%qual 82.6% | |||
| No rule changes on record between these events | ||||||
| Mid-Ohio Sports Car Course Runoffs 20162016-09-19 | 1:21.962John LaRue · fastest of 7 · top 5 within 2.6s | 1:22.049Nigel Saurino · fastest of 7 · top 5 within 3.0s | 81.7%qual 82.7% | |||
| No rule changes on record between these events | ||||||
| Daytona International Speedway Runoffs 20152015-09-21 | 1:54.477Yufeng Luo · fastest of 11 · top 5 within 2.5s | 1:55.135Yufeng Luo · fastest of 10 · top 5 within 2.1s | 83.2%qual 83.5% | |||
By track
| Track | Events | Typical % of the field | Best | Latest |
|---|---|---|---|---|
| Road America | 4 | 83.1% | 82.7%Runoffs 2026 | 82.7%Runoffs 2026 |
| Virginia International Raceway | 3 | 82.7% | 82.4%Runoffs 2019 | 82.7%Runoffs 2023 |
| Indianapolis Motor Speedway | 2 | 80.6% | 80.6%Runoffs 2021 | 80.6%Runoffs 2021 |
| Daytona International Speedway | 1 | 83.2% | 83.2%Runoffs 2015 | 83.2%Runoffs 2015 |
| Mid-Ohio Sports Car Course | 1 | 81.7% | 81.7%Runoffs 2016 | 81.7%Runoffs 2016 |
| Sonoma Raceway | 1 | 81.4% | 81.4%Runoffs 2018 | 81.4%Runoffs 2018 |
About this data
Every event the class ran, at any track, oldest to newest on the chart and newest first in the table. Each point is the class's best lap as a share of the field's best on the same day (every class that ran that day but the ones shown, each scaled by its usual pace against SM and averaged, with each shown class's own track character taken out, so one figure reads the same across years and tracks): the weather and the day cancel out, so one figure compares across years where lap times cannot, and across tracks too, since the class's own character at each track is taken out. A track with only one or two events on record is corrected less, since there is less to go on. A best from fewer than three cars is greyed. The rule changes that took effect between two events are folded between their rows.