BoP Lab / Classes / PX
PX vs FX pace at every track
| Event | PX | FX | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Qual best | Race best | Trap | Qual best | Race best | Trap | vs PX | |||
| Virginia International Raceway Runoffs 20222022-09-24 | 1:51.480Trevor A Russell · fastest of 5 · top 5 within 9.7s | 2:08.711Dimitrios Tsesmetzis · fastest of 4 · top 4 within 6.8s | 137.2Trevor A Russell | ||||||
9 rule changes (FX: 9)3 tyres & wheels · 2 cars added · 1 engine · 1 induction · 1 weight · 1 wording · Pro Formula F2000 tube frame transmission cut to 4 forward gears; sequential carries 25 lb. weight penalty. · FX Formula Mazda minimum weight set to 1270 lb. · FX Formula Mazda drops four-port Renesis engine option; weight minimum now per notes. · Formula Renault 2.0 (10-17) now requires 45mm Flat Plate Intake Restrictor; fairings before or after prohibited. · USF2000 Tube Frame adds Performance Electronics PE3-8400 ECU as alternative to Pectel T2. · Formula Mazda FX rule reference updated to current specifications document; tire marking no longer required. · FX Formula 4 tire choice unrestricted; must provide FIA certification rules upon request. · FX USF2000 Tube Frame front tyre changes from Hoosier radial 20.5 x 7.0 x 13 to any Hoosier 20.5 x 7.0 x 13. · FX Formula Renault 2.0 (00-09) and (10-17) tire choice unrestricted; no other component alterations except repairs.show
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| Indianapolis Motor Speedway Runoffs 20212021-09-25 | 1:38.596Vaughn Glace · fastest of 15 · top 5 within 4.1s | 1:38.833Vaughn Glace · fastest of 15 · top 5 within 4.3s | 138.6Vaughn Glace | ||||||
5 rule changes (FX: 5)2 cars added · 1 tyres & wheels · 1 wording · 1 other · FX USF2000 Tube Frame gains Hoosier radial tyre option, FC-compliant shocks, Wilwood brakes, and Bosch spark plugs. · FX USF2000 Tube Frame now allows any Hoosier radial tire 20.5×7.0×13 front, 22.5×8.0×13 rear. · Formula Renault 2.0 / Fran-Am 2000 added to FX class at 1250 lbs with 8-inch front, 10-inch rear wheels, sealed engine. · FX adds 2010–2017 Formula Renault 2.0, must comply with Table 1 notes. · FX FormulaSPEED FS2.0 now references online specifications instead of requiring World Speed Inc. documentation by April 2020.show
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| Road America Runoffs 20202020-10-02 | 2:16.968Jacob Loomis · fastest of 12 · top 5 within 2.7s | 2:17.553Jacob Loomis · fastest of 11 · top 5 within 3.5s | 139.3Brad Drew | ||||||
6 earlier rule changes on record, in force before Runoffs 2020 (from 2020)4 cars added · 2 wording · Formula Ireland / Formula FX added to FX class, must comply with Table 1 notes. · Formula Ireland/Formula FX cars pending specification submission for possible FX table addition. · Ex-Pro Formula Super Vee added to FX with 1600cc VW engine, 1190 lb minimum weight, 6-inch front and 8-inch rear wheels. · FormulaSPEED with 2.0L Mazda MZR engine, 8in front/10in rear wheels, adjustable dual rear planes, 1350 lbs moves from FA to FX. · FX Formula Mazda no longer requires tire marking; must comply with December 2019 GCR rules. · Pro Formula F 2000 and USF2000 Tube Frame engine and car rules simplified; FC rules and FRP MAZDA MZR F2000 specs now apply directly.show
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By track
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 the reference class'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.