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BoP Lab / Classes / SPU

SPU vs ITA vs SSM vs TTA 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)
ASB-SpecEPF600FAFCFE2FFFPFVFXGT1GT2GTXHPvsITA×PP2SMSMXSPU×SRF3vsSSM×STLSTUT1T2T3T4vsTTA×Show 174 inactive classes
Reference · what % is measured against
Tracks · untick to narrow

Closest to the field: SPU 100.0% of SPU Rick Gough, Pacific Raceways Northwest Pacific Grand Prix 2026 race · ITA 98.1% of SPU Donald Squirek, Michelin Raceway Road Atlanta SARRC 2020 qualifying

1:402:002:203 rule changes between Majors @ Pacific Raceway and SARRC 20203 ▾12 rule changes between SARRC 2020 and Palm Tree Winter 202612 ▾1 rule change between Palm Tree Winter 2026 and Majors Apr 20261 ▾SPU race best at SARRC 2020: 1:43.713 (Ricky Sanders)SPU race best at Northwest Pacific Grand Prix 2026: 1:34.122 (Rick Gough)SPU qualifying best at SARRC 2020: 1:47.450 (Randy Hutchings)ITA race best at SARRC 2020: 1:46.072 (Donald Squirek)ITA race best at Majors Apr 2026: 2:11.606 (Abmed Shmara)ITA race best at Southeast 2026: 1:51.273 (Steffen Clark)ITA race best at Southeast SARRC 2026: 1:27.922 (Roger Heaton)ITA qualifying best at Majors Apr 2016: 1:30.560 (Don Wiseman)ITA qualifying best at SARRC 2020: 1:45.443 (Donald Squirek)SSM race best at Majors Apr 2016: 1:29.237 (Kevin Kopp)SSM race best at Majors Apr 2026: 2:16.441 (James Powell)SSM qualifying best at Majors Apr 2016: 1:31.569 (Alan Olson)TTA race best at Majors @ Pacific Raceway: 1:46.900 (Darren Glaser)TTA qualifying best at Majors @ Pacific Raceway: 1:45.779 (Darren Glaser)Hallett Motor Racing Circuit · Majors Apr 2016Majors Apr2016Summit Point Raceway · Majors Apr 2016Majors Apr2016Pacific Raceways · Majors @ Pacific RacewayMajors @ Pacific Raceway2016Michelin Raceway Road Atlanta · SARRC 2020SARRC2020Homestead-Miami Speedway · Palm Tree Winter 2026Palm Tree Winter2026Thunderhill Raceway Park · Majors Apr 2026Majors Apr2026Carolina Motorsports Park · Southeast 2026Southeast2026Pacific Raceways · Northwest Pacific Grand Prix 2026Northwest Pacific Grand Prix2026Roebling Road · Southeast SARRC 2026Southeast SARRC2026
SPUITASSMTTAsolid race · dashed qualifying · slower is lower
98%99%100%101%102%3 rule changes between Majors @ Pacific Raceway and SARRC 20203 ▾12 rule changes between SARRC 2020 and Palm Tree Winter 202612 ▾1 rule change between Palm Tree Winter 2026 and Majors Apr 20261 ▾SPU race best at SARRC 2020: 100.0% of SPU's (Ricky Sanders)SPU race best at Northwest Pacific Grand Prix 2026: 100.0% of SPU's (Rick Gough)SPU qualifying best at SARRC 2020: 100.0% of SPU's (Randy Hutchings)ITA race best at SARRC 2020: 102.3% of SPU's (Donald Squirek)ITA qualifying best at SARRC 2020: 98.1% of SPU's (Donald Squirek)Hallett Motor Racing Circuit · Majors Apr 2016Majors Apr2016Summit Point Raceway · Majors Apr 2016Majors Apr2016Pacific Raceways · Majors @ Pacific RacewayMajors @ Pacific Raceway2016Michelin Raceway Road Atlanta · SARRC 2020SARRC2020Homestead-Miami Speedway · Palm Tree Winter 2026Palm Tree Winter2026Thunderhill Raceway Park · Majors Apr 2026Majors Apr2026Carolina Motorsports Park · Southeast 2026Southeast2026Pacific Raceways · Northwest Pacific Grand Prix 2026Northwest Pacific Grand Prix2026Roebling Road · Southeast SARRC 2026Southeast SARRC2026
SPUITASSMTTAsolid 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
EventSPUITASSMTTA
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 
Roebling Road Southeast SARRC 2026results only2026-06-271:27.922Roger Heaton · only car
No rule changes on record between these events
Pacific Raceways Northwest Pacific Grand Prix 2026results only2026-05-231:34.122Rick Gough · fastest of 3 · top 3 within 8.4s
No rule changes on record between these events
Carolina Motorsports Park Southeast 2026results only2026-05-231:51.273Steffen Clark · fastest of 2
No rule changes on record between these events
Thunderhill Raceway Park Majors Apr 2026results only2026-04-252:11.606Abmed Shmara · fastest of 8 · top 5 within 1.4s2:16.441James Powell · fastest of 2
1 rule change (ITA: 1)1 inductionshowhide
  • ITA E&O: Turbo Cars in IT #39691induction
Homestead-Miami Speedway Palm Tree Winter 2026results only2026-01-02
12 rule changes (ITA: 12)7 cars added · 1 engine · 1 weight · 1 wording · 2 othershowhide
  • ITA Change 90-93 Miata Diff Housing Upgrade Wording in Notes #38965wording
  • ITA Allow NA Miata to Upgrade to NB Miata Rear Suspension Uprights #38478other
  • ITA 1998-2002 Honda Accord 2.3L #38075cars added
  • ITA 90-93 Miatas to use 94-97 Differential Allowance In #35989other
  • ITA Battery Change #35854weight
  • ITA Request to Classify Chevrolet Beretta #35163cars added
  • ITA Spec LIne Error #33130cars added
  • ITA Request for Porsche 924S Reclassification to ITA #32441cars added
  • ITA Request to Move 83-88 Porsche 944 to ITA #30376cars added
  • ITA Request 2nd Generation Camry to ITB #30007cars added
  • ITA Request to clarify ITA Civic Si 92-95 #28868engine
  • ITA Request to classify a 2003 Honda Accord #28898cars added
Michelin Raceway Road Atlanta SARRC 20202020-07-251:47.450Randy Hutchings · only car1:43.713Ricky Sanders · fastest of 2119.9Ricky Sanders1:45.443Donald Squirek · fastest of 3 · top 3 within 7.5s1:46.072Donald Squirek · fastest of 3 · top 3 within 6.9s110.4Donald Squirek+2.359squal -2.007s102.3%qual 98.1%
3 rule changes (ITA: 3)1 induction · 1 tyres & wheels · 1 weightshowhide
  • ITA Cleanup 4.f Traction control #28609tyres & wheels
  • ITA Request clarification 1999 Ford Escort ZX2 S?R #26966weight -45 lbs
  • ITA Request clarification on 9.1.3 D1.A.2 #26237induction
Pacific Raceways Majors @ Pacific Raceway2016-05-281:45.779Darren Glaser · only car1:46.900Darren Glaser · 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
No rule changes on record between these events
Hallett Motor Racing Circuit Majors Apr 20162016-04-091:30.560Don Wiseman · only car

By track

TrackEvents Typical % of SPU Best Latest 
Pacific Raceways2100.0%1 of 2 with SPU100.0%Northwest Pacific Grand Prix 2026100.0%Northwest Pacific Grand Prix 2026
Carolina Motorsports Park10 of 1 with SPU
Hallett Motor Racing Circuit10 of 1 with SPU
Homestead-Miami Speedway10 of 1 with SPU
Michelin Raceway Road Atlanta1100.0%100.0%SARRC 2020100.0%SARRC 2020
Roebling Road10 of 1 with SPU
Summit Point Raceway10 of 1 with SPU
Thunderhill Raceway Park10 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.