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BoP Lab / Classes / SPU

SPU vs B-spec vs SRF 3 vs SMSE 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: remove one to add another)
1DASB SpecvsB-spec×B-SpecBSBSpcBSpecC6CFCFCCTACTBCTCCTDEPEPxF5F6F500F1000FAFBFCFEFE 2FE2FFFMFPFRIFVFXGT-1GT-2GT-XGT1GT2GT3GT3UGTAGTLGTXHPIT7ITAITBITCITEITE-OITRITSPP1P2PXS7SMSM vsSMSE×SMSE-TSMXSPU×SRFvsSRF 3×SRF3SSMSTLSTUSUNT1T2T3T4TTAUnknownHide inactive classes
Reference · what % is measured against
Tracks · untick to narrow

Closest to the field: SMSE 99.8% of SPU Frederick Baker, Michelin Raceway Road Atlanta SARRC 2020 qualifying

1:451:501:552:002:05SPU race best at SARRC 2020: 1:43.713 (Ricky Sanders)SPU qualifying best at SARRC 2020: 1:47.450 (Randy Hutchings)SRF 3 qualifying best at Majors May 2016: 2:06.800 (Scott Rettich)SMSE race best at SARRC 2020: 1:48.433 (Frederick Baker)SMSE qualifying best at SARRC 2020: 1:47.184 (Frederick Baker)Pittsburgh International Race Complex · Majors May 2016Majors May2016Michelin Raceway Road Atlanta · SARRC 2020SARRC2020
SPUB-specSRF 3SMSEsolid race · dashed qualifying · slower is lower
100%101%102%103%104%105%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)SMSE race best at SARRC 2020: 104.6% of SPU's (Frederick Baker)SMSE qualifying best at SARRC 2020: 99.8% of SPU's (Frederick Baker)Pittsburgh International Race Complex · Majors May 2016Majors May2016Michelin Raceway Road Atlanta · SARRC 2020SARRC2020
SPUB-specSRF 3SMSEsolid 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
EventSPUB-specSRF 3SMSE
Qual best Race best Trap Qual best Race best Trap vs SPU % of SPU 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 Sanders1:47.184Frederick Baker · fastest of 4 · top 4 within 4.9s1:48.433Frederick Baker · fastest of 4 · top 4 within 6.3s107.4Ken Steagall+4.720squal -0.266s104.6%qual 99.8%
No rule changes on record between these events
Pittsburgh International Race Complex Majors May 20162016-05-142:06.800Scott Rettich · fastest of 13 · top 5 within 4.5s

By track

TrackEvents Typical % of SPU Best Latest 
Michelin Raceway Road Atlanta1100.0%100.0%SARRC 2020100.0%SARRC 2020
Pittsburgh International Race Complex10 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.