BoP Lab / Classes / F6
F6 vs FB vs SRF vs SM pace at every track
Lap times across years say as much about the weather as the class. % of F6 is each class's best lap as a share of F6's on the same day, 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: F6 100.0% of F6 Calvin Stewart, Virginia International Raceway Runoffs 2023 race · SM 114.7% of F6 Julian DaCosta, Virginia International Raceway Runoffs 2023 race
| Event | F6 | FB | SRF | SM | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Qual best | Race best | Trap | Qual best | Race best | Trap | vs F6 | % of F6 | Qual best | Race best | Trap | vs F6 | % of F6 | Qual best | Race best | Trap | vs F6 | % of F6 | |||
| Road America Runoffs 20262026-09-28 | 2:18.489Calvin Stewart · fastest of 13 · top 5 within 4.2s-0.617s (-0.44%) | 2:20.255James Weida · fastest of 13 · top 5 within 2.0s+1.415s (+1.02%) | 143.0Calvin Stewart-4.5 mph (-3.1%) | 2:42.173Brett Kowalski · fastest of 34 · top 5 within 0.3s-0.938s (-0.58%) | 2:42.725Francisco Barroso · fastest of 35 · top 5 within 0.2s-1.705s (-1.04%) | 119.6Wyatt Couch+0.3 mph (+0.3%) | +22.470squal +23.684s | 116.0%qual 117.1% | ||||||||||||
| Road America Runoffs 20252025-09-29 | 2:43.111Bobby Gossett · fastest of 32 · top 5 within 0.3s+2.005s (+1.24%) | 2:44.430Kyle Greenhill · fastest of 28 · top 5 within 0.3s+2.944s (+1.82%) | 119.3Francisco Barroso-0.6 mph (-0.5%) | |||||||||||||||||
| Road America Runoffs 20242024-10-01 | 2:19.106Calvin Stewart · fastest of 22 · top 5 within 1.3s | 2:18.840James Weida · fastest of 22 · top 5 within 1.0s | 147.6Calvin Stewart | 2:41.106Ethan Goulart · fastest of 49 · top 5 within 0.5s-1.103s (-0.68%) | 2:41.486Brett Kowalski · fastest of 43 · top 5 within 0.3s-2.262s (-1.38%) | 119.9Alex Bertagnoli-1.4 mph (-1.2%) | +22.646squal +22.000s | 116.3%qual 115.8% | ||||||||||||
14 rule changes (SRF: 10, SM: 4)4 suspension & brakes · 3 tyres & wheels · 1 engine · 1 weight · 2 wording · 3 othershow
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| Virginia International Raceway Runoffs 20232023-09-23 | 1:57.437Calvin Stewart · fastest of 9 · top 5 within 4.7s | 1:58.816Calvin Stewart · fastest of 9 · top 5 within 3.6s | 144.0Calvin Stewart | 2:14.986Danny Steyn · fastest of 52 · top 5 within 0.1s+0.322s (+0.24%) | 2:16.229Julian DaCosta · fastest of 46 · top 5 within 0.3s-2.878s (-2.07%) | 120.3Jim Drago+1.1 mph (+0.9%) | +17.413squal +17.549s | 114.7%qual 114.9% | ||||||||||||
| Virginia International Raceway Runoffs 20222022-09-24 | 2:14.664Danny Steyn · fastest of 60 · top 5 within 0.2s+0.112s (+0.08%) | 2:19.107Travis Wiley · fastest of 58 · top 5 within 0.9s+2.648s (+1.94%) | 119.2Jonathan Neudorf-0.6 mph (-0.5%) | |||||||||||||||||
| Indianapolis Motor Speedway Runoffs 20212021-09-25 | 1:57.695Brian Henderson · fastest of 90 · top 5 within 0.5s-0.611s (-0.52%) | 1:58.837Brian Henderson · fastest of 88 · top 5 within 0.3s-0.263s (-0.22%) | 119.8Kyle Greenhill | |||||||||||||||||
7 rule changes (SRF: 6, SM: 1)2 engine · 1 suspension & brakes · 1 tyres & wheels · 1 weight · 2 othershow
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| Road America Runoffs 20202020-10-02 | 2:42.209Kyle Greenhill · fastest of 77 · top 5 within 0.5s | 2:43.748Preston Pardus · fastest of 75 · top 5 within 1.0s | 121.3Kyle Greenhill | |||||||||||||||||
7 rule changes (SRF: 5, SM: 2)3 suspension & brakes · 1 engine · 1 tyres & wheels · 1 weight · 1 othershow
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| Virginia International Raceway Runoffs 20192019-10-05 | 1:54.469Pete Frost · only car | 1:57.688Pete Frost · only car | 145.9Pete Frost | 2:14.552Todd Buras · fastest of 60 · top 5 within 0.2s | 2:16.459Elivan Goulart · fastest of 56 · top 5 within 0.4s | 119.8Jim Drago | ||||||||||||||
| Sonoma Raceway Runoffs 20182018-10-10 | 1:28.612J R Osborne · fastest of 7 · top 5 within 3.3s | 1:31.189J R Osborne · fastest of 7 · top 5 within 3.7s | 140.5J R Osborne | 1:54.355Ken Sutherland · fastest of 48 · top 5 within 0.7s | 1:55.278Michael Carter · fastest of 48 · top 5 within 0.3s | 102.2Danny Steyn | ||||||||||||||
| No rule changes on record between these events | ||||||||||||||||||||
| Indianapolis Motor Speedway Runoffs 20172017-09-25 | 1:33.746Gary Hickman · fastest of 18 · top 5 within 3.3s | 1:33.702Alex Mayer · fastest of 17 · top 5 within 3.0s | 1:51.573Thomas Kirchman · fastest of 50 · top 5 within 2.8s | 1:53.769Todd Harris · fastest of 45 · top 5 within 0.2s | 1:58.306Chris Haldeman · fastest of 86 · top 5 within 0.5s | 1:59.100Michael Gagliardo · fastest of 83 · top 5 within 0.6s | ||||||||||||||
| No rule changes on record between these events | ||||||||||||||||||||
| Mid-Ohio Sports Car Course Runoffs 20162016-09-19 | 1:19.886Alex Mayer · fastest of 10 · top 5 within 1.5s | 1:21.015Jeremy Hill · fastest of 10 · top 5 within 1.2s | 1:37.344Mike Miserendino · fastest of 27 · top 5 within 0.8s | 1:37.621Todd Harris · fastest of 27 · top 5 within 0.6s | 1:40.514Justin Hille · fastest of 45 · top 5 within 0.3s | 1:40.764Michael Carter · fastest of 44 · top 5 within 0.3s | ||||||||||||||
| No rule changes on record between these events | ||||||||||||||||||||
| Daytona International Speedway Runoffs 20152015-09-21 | 1:50.711J R Osborne · fastest of 20 · top 5 within 1.1s | 1:51.616J R Osborne · fastest of 19 · top 5 within 2.1s | 2:14.306Cliff White · fastest of 39 · top 5 within 1.2s | 2:16.700Cliff White · fastest of 38 · top 5 within 0.5s | 2:18.661Andrew Carbonell · fastest of 62 · top 5 within 0.6s | 2:24.067Todd Lamb · fastest of 59 · top 5 within 0.8s | ||||||||||||||
By track
| Track | Events | Typical % of F6 | Best | Latest |
|---|---|---|---|---|
| Road America | 4 | 100.0%2 of 4 with F6 | 100.0%Runoffs 2024 | 100.0%Runoffs 2026 |
| Virginia International Raceway | 3 | 100.0%1 of 3 with F6 | 100.0%Runoffs 2023 | 100.0%Runoffs 2023 |
| Indianapolis Motor Speedway | 2 | 0 of 2 with F6 | ||
| Daytona International Speedway | 1 | 0 of 1 with F6 | ||
| Mid-Ohio Sports Car Course | 1 | 0 of 1 with F6 | ||
| Sonoma Raceway | 1 | 0 of 1 with F6 |
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 F6's best on the same day: the weather and the day cancel out, so one figure compares across years where lap times cannot; a class that suits one track more than another still reads differently there. It still moves when the yardstick's own balance changes or its field thins, and an event the yardstick did not run has no point. A best from fewer than three cars is greyed. The rule changes that took effect between two events are folded between their rows.