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BoP Lab / Classes / SPU

SPU vs ITR 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.

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Reference · what % is measured against
Tracks · untick to narrow
1:101:201:301:401:506 rule changes between Majors May 2016 and SARRC 20206 ▾SPU race best at SARRC 2020: 1:43.713 (Ricky Sanders)SPU qualifying best at SARRC 2020: 1:47.450 (Randy Hutchings)ITR race best at Majors May 2016: 1:13.673 (Robert G Wright)ITR qualifying best at Majors May 2016: 1:12.883 (Robert G. Wright)Circuit of St. Louis (formerly Gateway Motorsports · Majors May 2016Majors May2016Michelin Raceway Road Atlanta · SARRC 2020SARRC2020
SPUITRsolid race · dashed qualifying · slower is lower
100%6 rule changes between Majors May 2016 and SARRC 20206 ▾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)Circuit of St. Louis (formerly Gateway Motorsports · Majors May 2016Majors May2016Michelin Raceway Road Atlanta · SARRC 2020SARRC2020
SPUITRsolid 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
EventSPUITR
Qual best Race best Trap 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 Sanders
6 rule changes (ITR: 6)2 cars added · 2 weight · 1 induction · 1 tyres & wheelsshowhide
  • ITR Cleanup 4.f Traction control #28609tyres & wheels
  • ITR Request to Classify 2008-2013 BMW 128i #26724cars added
  • ITR Request clarification 1999 Ford Escort ZX2 S?R #26966weight -45 lbs
  • ITR Please Classify the '13-'14 Subaru BRZ/ Scion FRS in IT #27242cars added
  • ITR Request Reduction of Minimum weight for 2000-2003 Honda S2000 #26096weight +20 lbs
  • ITR Request clarification on 9.1.3 D1.A.2 #26237induction
Circuit of St. Louis (formerly Gateway Motorsports Majors May 20162016-05-141:12.883Robert G. Wright · only car1:13.673Robert G Wright · only car

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
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.