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BoP Lab / Classes / TTA

TTA vs ITR pace at every track

Lap times across years say as much about the weather as the class. % of TTA is each class's best lap as a share of TTA'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+F600+FA+FC+FE2+FF+FP+FV+FX+GT1+GT2+GTX+HP+vsITR×P+P2+SM+SMX+SRF3+STL+STU+T1+T2+T3+T4+TTA×Show 176 inactive classes
Reference · what % is measured against
Tracks · untick to narrow
1:101:201:301:401:5017 rule changes between Majors @ Pacific Raceway and Palm Tree Winter 202617 ▾1 rule change between Palm Tree Winter 2026 and Southeast SARRC 20261 ▾TTA race best at Majors @ Pacific Raceway: 1:46.900 (Darren Glaser)TTA qualifying best at Majors @ Pacific Raceway: 1:45.779 (Darren Glaser)ITR race best at Majors May 2016: 1:13.673 (Robert G Wright)ITR race best at Southeast SARRC 2026: 1:23.091 (Matthew Fritz)ITR qualifying best at Majors May 2016: 1:12.883 (Robert G. Wright)Circuit of St. Louis (formerly Gateway Motorsports · Majors May 2016Majors May2016Pacific Raceways · Majors @ Pacific RacewayMajors @ Pacific Raceway2016Homestead-Miami Speedway · Palm Tree Winter 2026Palm Tree Winter2026Roebling Road · Southeast SARRC 2026Southeast SARRC2026
TTAITRsolid race · dashed qualifying · slower is lower
100%17 rule changes between Majors @ Pacific Raceway and Palm Tree Winter 202617 ▾1 rule change between Palm Tree Winter 2026 and Southeast SARRC 20261 ▾TTA race best at Majors @ Pacific Raceway: 100.0% of TTA's (Darren Glaser)TTA qualifying best at Majors @ Pacific Raceway: 100.0% of TTA's (Darren Glaser)Circuit of St. Louis (formerly Gateway Motorsports · Majors May 2016Majors May2016Pacific Raceways · Majors @ Pacific RacewayMajors @ Pacific Raceway2016Homestead-Miami Speedway · Palm Tree Winter 2026Palm Tree Winter2026Roebling Road · Southeast SARRC 2026Southeast SARRC2026
TTAITRsolid race · dashed qualifying · each class's best lap as a share of TTA's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventTTAITR
Qual best Race best Trap Qual best Race best Trap vs TTA % of TTA 
Roebling Road Southeast SARRC 2026results only2026-06-271:23.091Matthew Fritz · fastest of 3 · top 3 within 1.3s
1 rule change (ITR: 1)1 inductionshowhide
  • ITR E&O: Turbo Cars in IT #39691induction
Homestead-Miami Speedway Palm Tree Winter 2026results only2026-01-02
17 rule changes (ITR: 17)6 cars added · 6 weight · 3 induction · 1 tyres & wheels · 1 othershowhide
  • ITR Correct Response to Letter 38971 in October Tech Bulletin #39105weight
  • ITR NASA Spec3 to ITR #38971weight
  • ITR Combine RX8 Spec Lines in ITR #37383other
  • ITR Battery Change #35854weight
  • ITR Request to classify BMW 325XIT #33889cars added
  • ITR car classification #35263cars added
  • ITR ADJUST WEIGHTS ON ITR CARS #35334weight -122 lbs
  • ITR TIR for Turbo cars in TIR #33856induction
  • ITR Request to classify 93 Talon TSI AWD #31727cars added
  • ITR Class Turbo Cars #29774induction
  • ITR Request to classify a 2003 Honda Accord #28898cars added
  • 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
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
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 TTA Best Latest 
Circuit of St. Louis (formerly Gateway Motorsports10 of 1 with TTA
Homestead-Miami Speedway10 of 1 with TTA
Pacific Raceways1100.0%100.0%Majors @ Pacific Raceway100.0%Majors @ Pacific Raceway
Roebling Road10 of 1 with TTA
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 TTA'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.