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SPU vs SSM vs ITS pace at every track

Lap times across years say as much about the weather as the class. % of SPU is each class's best lap as a share of SPU'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.

Class · click a class to switch, + to compare alongside (up to 4)
AS+B-Spec+EP+FA+FC+FE2+FF+FP+FV+FX+GT1+GT2+GTX+HP+vsITS×P+P2+SM+SMX+SPU×SRF3+vsSSM×STL+STU+T1+T2+T3+T4+Show 48 inactive classes
Reference · what % is measured against
Tracks · untick to narrow
1:201:301:401:504 rule changes between Majors May 2016 and SARRC 20204 ▾SPU race best at SARRC 2020: 1:43.713 (Ricky Sanders)SPU qualifying best at SARRC 2020: 1:47.450 (Randy Hutchings)SSM race best at Majors Apr 2016: 1:29.237 (Kevin Kopp)SSM qualifying best at Majors Apr 2016: 1:31.569 (Alan Olson)ITS race best at Majors May 2016: 1:15.165 (Greg Hartrum)ITS race best at SARRC 2020: 1:45.740 (Daniel Vallejo)ITS qualifying best at Majors May 2016: 1:15.464 (Greg Hartrum)ITS qualifying best at SARRC 2020: 1:45.279 (Daniel Vallejo)Summit Point Raceway · Majors Apr 2016Majors Apr2016Circuit of St. Louis (formerly Gateway Motorsports · Majors May 2016Majors May2016Michelin Raceway Road Atlanta · SARRC 2020SARRC2020
SPUSSMITSsolid race · dashed qualifying · slower is lower
98%99%100%101%102%4 rule changes between Majors May 2016 and SARRC 20204 ▾SPU race best at SARRC 2020: 100.0% of SPU's (Ricky Sanders)SPU qualifying best at SARRC 2020: 100.0% of SPU's (Randy Hutchings)ITS race best at SARRC 2020: 102.0% of SPU's (Daniel Vallejo)ITS qualifying best at SARRC 2020: 98.0% of SPU's (Daniel Vallejo)Summit Point Raceway · Majors Apr 2016Majors Apr2016Circuit of St. Louis (formerly Gateway Motorsports · Majors May 2016Majors May2016Michelin Raceway Road Atlanta · SARRC 2020SARRC2020
SPUSSMITSsolid race · dashed qualifying · each class's best lap as a share of SPU's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventSPUSSMITS
Qual best Race best Trap Qual best Race best Trap vs SPU % of SPU Qual best Race best Trap vs SPU % of SPU 
Michelin Raceway Road Atlanta SARRC 20202020-07-251:47.450Randy Hutchings · only car1:43.713Ricky Sanders · fastest of 2119.9Ricky Sanders1:45.279Daniel Vallejo · fastest of 21:45.740Daniel Vallejo · fastest of 2115.1Daniel Vallejo+2.027squal -2.171s102.0%qual 98.0%
4 rule changes (ITS: 4)1 induction · 1 tyres & wheels · 1 weight · 1 othershowhide
  • ITS Cleanup 4.f Traction control #28609tyres & wheels
  • ITS Request OEM hardtops for IT #28272other
  • ITS Request clarification 1999 Ford Escort ZX2 S?R #26966weight -45 lbs
  • ITS Request clarification on 9.1.3 D1.A.2 #26237induction
Circuit of St. Louis (formerly Gateway Motorsports Majors May 20162016-05-141:15.464Greg Hartrum · only car1:15.165Greg Hartrum · only car
No rule changes on record between these events
Summit Point Raceway Majors Apr 20162016-04-291:31.569Alan Olson · fastest of 26 · top 5 within 1.9s1:29.237Kevin Kopp · fastest of 27 · top 5 within 0.3s

By track

TrackEvents Typical % of SPU Best Latest 
Circuit of St. Louis (formerly Gateway Motorsports10 of 1 with SPU
Michelin Raceway Road Atlanta1100.0%100.0%SARRC 2020100.0%SARRC 2020
Summit Point Raceway10 of 1 with SPU
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 SPU'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.