BoP Lab / Hallett Motor Racing Circuit
GTX vs SM vs F6 pace at Hallett Motor Racing Circuit
Quickest here: GTX 1:14.200 Eric Presbrey, AVRG Green Country Grand Prix 2026 race · SM 1:22.202 Matt Stretch, AVRG Green Country Grand Prix 2024 qualifying · F6 1:22.533 Jason Martin, AVRG Green Country Grand Prix 2024 qualifying
| Event | GTX | SM | F6 | ||||||||||||
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| Qual best | Race best | Trap | Qual best | Race best | Trap | vs GTX | % of GTX | Qual best | Race best | Trap | vs GTX | % of GTX | |||
| AVRG Green Country Grand Prix 2026 AVRGGR262026-04-25 | 1:15.997Eric Presbrey · fastest of 2-10.336s (-11.97%) | 1:14.200Eric Presbrey · fastest of 2-12.002s (-13.92%) | 130.9Eric Presbrey+19.0 mph (+16.9%) | 1:27.076John Salerno · fastest of 22 · top 5 within 0.6s+0.435s (+0.50%) | 1:26.998John Salerno · fastest of 22 · top 5 within 0.3s-0.518s (-0.59%) | 94.9Will Robinson+0.3 mph (+0.3%) | +12.798squal +11.079s | 117.2%qual 114.6% | 1:25.542Timothy Friest · fastest of 2+3.009s (+3.65%) | 1:24.693Timothy Friest · fastest of 2+1.170s (+1.40%) | 100.2Carl Maier-10.0 mph (-9.1%) | +10.493squal +9.545s | 114.1%qual 112.6% | ||
9 rule changes (GTX: 5, SM: 4)4 cars added · 1 engine · 4 wording · GTX adds Ferrari 296 GT3 with restrictor and weight, effective 2026-04-01. · SM and SMX part number 0000-10-6900 replaced with 0000-06-5016-KT. · GT3U class removed from GCR; GT3U cars now run in STU with 3.0" main frame and 2" front spoiler minimum ride height. · GTX Misc Table 4 adds RCR T70 Coupe with 2200 lbs minimum weight, no restrictor specified. · GTX Ligier LMP3 now allows any normally aspirated LS Chevrolet engine. · SMX drivers must submit data acquisition files on time or face suspension and $250 fine. · SMX penalty language clarified: level 1 and 3 infractions may carry $1,000 fine; level 2 and 4 may carry $500 fine. · GTX Porsche GT2 RS Clubsport classified with factory specifications required at all race events. · SM cars limited to one set of Hoosier SM 7.5 P205/50/ZR17 per Super Tour event weekend for dry sessions.show
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| AVRG Green Country Grand Prix 2025 AVRGGR252025-04-26 | 1:26.333Michael Young · only car+6.009s (+7.48%) | 1:26.202Michael Young · only car+6.569s (+8.25%) | 112.0Michael Young-10.3 mph (-8.4%) | 1:26.641Vinnie Meskelis · fastest of 15 · top 5 within 0.7s+4.439s (+5.40%) | 1:27.516Vinnie Meskelis · fastest of 15 · top 5 within 0.6s-0.312s (-0.36%) | 94.6Matt Stretch-10.6 mph (-10.1%) | +1.314squal +0.308s | 101.5%qual 100.4% | |||||||
7 rule changes (GTX: 2, SM: 5)1 weight · 6 wording · TA2 rear wing height rule clarified: OEM aerodynamic devices exempt from peak-of-roof requirement. · SMX allows OE instrument cluster relocation for aftermarket dash mounting, with wiring re-routed only; alternate gauges now permitted. · SMX Spec MX-5 camera requirement wording changed; non-functioning recorder now grounds for penalty or disqualification. · SMX Spec MX-5 must run latest AIM Data Logger Spec MX-5 ECU Protocol; wording clarification for technical compliance. · SMX Mazda Miata OE versus OEM definitions clarified in GCR Section 9.1.7.1. · SM and SMX shifter bushing rules clarified: alternate bushing at shift lever bottom now allowed. · GT2-ST Acura NSX minimum weight raised to 3000 lbs, restrictor increased to 45mm TIR.show
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| AVRG Green Country Grand Prix 2024 AVRGGR242024-04-20 | 1:20.324Michael Staab · fastest of 2 | 1:19.633Michael Staab · fastest of 2 | 122.3Michael Staab | 1:22.202Matt Stretch · fastest of 24 · top 5 within 5.6s | 1:27.828Logan Stretch · fastest of 23 · top 5 within 0.7s | 105.2Matt Stretch | +8.195squal +1.878s | 110.3%qual 102.3% | 1:22.533Jason Martin · fastest of 2 | 1:23.523Jason Martin · fastest of 2 | 110.2Jason Martin | +3.890squal +2.209s | 104.9%qual 102.8% | ||
45 earlier rule changes on record, in force before AVRG Green Country Grand Prix 2024 (from 2019)20 cars added · 3 induction · 1 aero · 1 engine · 1 suspension & brakes · 1 weight · 18 wording · GT1, GT2, GT3, GTL, GTX rear spoiler maximum surface area limit of 295.0 square inches removed. · GT1/GT2/GT3/GTL/GTX Direct Injection now permitted if OE, using only OE pump, hoses, injectors. · GT2/3 Nissan, Mazda, Mitsubishi 4G93, QR25DE/DD, QE25DE/DD Direct Injection now permitted per 9.1.2.F.7.5.E. · GTX adds KTM X-Bow classification with restrictor and weight specifications effective 2024-01-01. · GTL spec lines moved to contiguous position with GT2 and GT3; GTA category and spec lines renumbered and moved behind GTL. · GTX Ligier LMP3 3.7L NA classified at 2203 lbs with 22 mm restrictor. · GTX Ligier JSP4 newly classified as GTX Misc with restrictor and weight specified. · Fields Cardinal V8 classified in GT1 with Ford V8 engine, 4.9L displacement, 2100 lbs minimum weight. · SM Mazda MX-5 Miata 01-05 weight increases to 2450 lbs, or 2465 with alternate bore. · GT2 TA2 and GTA throttle body part numbers updated to GM 90mm electronic #12570790 or Edelbrock 90mm mechanical #33869 or #3870. · GT taillights may now be original style or a panel graphic with functioning red LED brake lamps; wording change only. · Porsche 992 GT3 Cup Car newly classified in GTX. · GTX Wolf GB08 F1 Ford 52XS V8 added to classification at 1725 lbs minimum weight. · C7 Corvette Grand Sport classified in GTX Misc at 3200 lbs with option to remove displacement on demand valve train. · GTX eligible prototypes expanded: IMSA GTP years changed to 1981-1993, five prototype categories added. · SM Majors must run authorized Penske shock and mount; Regional competitors' requirement eligibility clarified. · GTX McLaren 720s GT3 newly classified at 3000 lbs with 3000 mm restrictor. · GTX-FIA GT3 removes all intake restrictor requirements for fifteen car models; McLaren name corrected. · GT3 Fun Cup Beetle EVO3 classified with 1984 cc sealed SOHC engine, 2060 lbs minimum weight. · GTX SRO-GT4 Porsche 718 Club Sport MR GT4 classified, unrestricted, 2900 lbs minimum weight. · GTA part numbers updated: 0-80541-1 to 0-80541-2 in two sections and 6010 to 6014X in TA2 Appendix. · Grullon GT with 2.0L K20 moved from GTX to GT2-ST, minimum weight 2350 lbs, unrestricted. · GTX Grullon GT added, unrestricted, 2350 lbs, factory spec required. · SM adds procedures for testing obsolete part replacements and BOP updates in sanctioned events with CRB approval. · SM aftermarket radiators must mount in original location, maintain core plane, require no body modifications, block openings, keep one OEM fan in stock location; 1990-1997 cars may install upper radiator seal NA75-50-OK7A. · GT1, GT2, GT3, GTL, GTX now permit turbocharging/supercharging if listed on spec line. · GTX Chevrolet Camaro ZL1 LT4 with factory supercharger classified at 3400 lbs minimum weight. · GTX adds KTM X-Bow GT4, turbocharged 2.5L Audi TFSI I5, 2000 lbs minimum weight. · SM rear brake calipers may use single bracket under upper retaining bolt to prevent pin failure. · TA2 Gurney flap wording clarified: terminology standardized to 'Gurney flap', height limits and thickness specifications remain 0.50 inch / 0.625 inch or 0.375 inch / 0.0625 inch depending on configuration. · STO rear wing wording clarified: 'wicker' changed to 'Gurney flap' in maximum chord and mounting height rules. · GT classes clarify Gurney flap wording, replacing wickerbill/tab terminology with flap; specifications unchanged. · GTX tube frame cars must weigh 2780 pounds; stock car bodies now permitted. · GTX adds Lotus Evora GTS with 3.5L 2GR-FE engine, no restrictor, 2950 lbs minimum weight. · GT1, GT2, GT3, GTL, GTX may omit windshield clips if factory glass is bonded per original specifications. · Factory Five Type 65 Coupe R with Ford 302/351 or 5.0/5.2L NA added to GTX-MISC at 2600 lbs. · GTX tube frame cars gain fuel injection with 90mm maximum throttle body size. · Ligier JS2 R classified in GTX, no performance parameters specified in filing. · GT1 and GT2/GT3/LITE ride height requirements removed from GCR sections 9.1.2.D.5.a.1 and 9.1.2.F.7.b. · GTX replaces all FIA GT4 references with SRO GT4. · SM fuel pump and filter must be Mazda or OEM Equivalent part. · SM 1999-2000 model year cars may use replacement Mazda ECU and injector harnesses, unmodified. · SM electrical rules reorganized and clarified; alternator external regulation now prohibited except via OEM ECU/kill switch. · SM removes tire tread protrusion beyond fender opening requirement from GCR 9.1.7.C.5. · GTX FIA GT3: Audi R8 40mm restrictor 2900 lbs, BMW Z4 70mm 2800 lbs, Ferrari 488 35mm restrictor 3025 lbs classified.show
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Best is the class's fastest lap in that event's qualifying or race sessions, with the driver who set it, how many cars set a time that session and how close the top five were; a best from fewer than three cars is greyed. With two or more classes, "vs" is the gap of each class's best to the first class's at the same event. "% of GTX" is the class's best as a share of GTX's best at the same event (100% is level, less is quicker): weather and track condition move every class together, so this compares across years where the raw times do not. It still breaks when GTX's own field changes or one session was wet and another dry. Newest event first. The coloured figure under each value is the change from the previous event that has one (green is quicker, red slower). Whole laps only, so events with different sector layouts still compare. Weather and track condition are not accounted for.