Sectors are not comparable across all of these events. Sector times and the theoretical lap use Runoffs 2022, Runoffs 2023 only. Runoffs 2019 (sectors cut at different points) counts towards whole-lap times and trap speed only.
One lap is left out as timing errors (far too short to be a lap of this track). The rest of those sessions, sectors included, is used.
One row per driver and car (a driver who changed cars has a row for each). Each cell is that driver's best in that car across the selected events, with the session it was set in. Best 5-lap stint is the mean of the driver's quickest five consecutive race laps, and consistency is how far their median race lap sat behind their best in that race (small is a driver who does it every lap); both come from the race with the best stint. The fastest in each column is purple, and a car whose best lap is more than 115% of the fastest in its class is greyed (marked ">115%" beside the driver) and left out of the colour scale. Click a column to sort, a row to highlight it.
Theoretical lap is the sum of the best sectors, whichever laps they came from, and never slower than the best lap (where a car's fastest laps were recorded without sector times, its best lap is used). The 115% mark is about the car's best lap only: a car whose best lap is within 115% of the fastest in its class is never marked. Greyed sectors with no theoretical lap mean the sector times on file do not add up to a believable lap. Letters refer to the events above; Q is qualifying, R a race.
Sectors
S1 NT SF → Bridge 1.03 mi
S2 Bridge → ST SF 0.90 mi
S3 ST SF → NT SF 1.35 mi
SPd In → Out 0.02 mi
Sectors are numbered in lap order from start/finish, whatever each event's timing called them; the loop names are SCCA timing's.
By car
Car
Class
Drivers
Lap
Qual
Race
Trap
S1
S2
S3
BMW Z3 2.5L
EP
6
2:00.987Jesse Prather
2:00.987Jesse Prather
2:01.631Jesse Prather
144.9Jesse Prather
43.847Jesse Prather
32.453Jesse Prather
45.944Jesse Prather
BMW Z3 2.5L
EP
3
2:00.987Jesse Prather
2:00.987Jesse Prather
2:01.631Jesse Prather
144.9Jesse Prather
43.847Jesse Prather
32.453Jesse Prather
45.944Jesse Prather
BMW Z3 2.5L (1999)
EP
3
2:04.050Greg Ira
2:04.784Jon Brakke
2:04.050Greg Ira
144.6Greg Ira
44.077Jon Brakke
32.834Greg Ira
46.615Jon Brakke
Porsche 944 S2
EP
1
2:02.001Kip Van Steenburg
2:02.001Kip Van Steenburg
2:02.373Kip Van Steenburg
147.5Kip Van Steenburg
Mazda RX-7
EP
11
2:02.492John Hainsworth
2:02.935John Hainsworth
2:02.492John Hainsworth
140.4John Hainsworth
44.097John Hainsworth
32.568John Hainsworth
46.677John Hainsworth
Mazda RX-7 (1990)
EP
1
2:02.492John Hainsworth
2:02.935John Hainsworth
2:02.492John Hainsworth
140.4John Hainsworth
44.097John Hainsworth
32.568John Hainsworth
46.677John Hainsworth
Mazda RX-7 (1987)
EP
1
2:07.912Steve Rose
2:09.033Steve Rose
2:07.912Steve Rose
136.9Steve Rose
45.843Steve Rose
34.538Steve Rose
48.476Steve Rose
Mazda RX-7 (1982)
EP
1
2:10.118Austin Bradshaw
2:10.118Austin Bradshaw
131.5Austin Bradshaw
45.865Austin Bradshaw
34.971Austin Bradshaw
49.078Austin Bradshaw
Mazda RX-7
EP
4
2:11.091James Lindenthal
2:11.091James Lindenthal
2:11.912Charles Vaccaro
132.2Charles Vaccaro
46.185James Lindenthal
34.670James Lindenthal
49.342James Lindenthal
Mazda RX-7 (1988)
EP
1
2:14.067Michael Cooke
2:14.067Michael Cooke
2:18.980Michael Cooke
125.4Michael Cooke
46.844Michael Cooke
35.348Michael Cooke
51.213Michael Cooke
Mazda RX-7 (1986)
EP
1
2:14.234Sean Saggese
2:14.234Sean Saggese
130.5Sean Saggese
46.705Sean Saggese
35.447Sean Saggese
50.706Sean Saggese
Mazda RX-7 (1989)
EP
1
2:18.812John Bell
2:18.812John Bell
124.7John Bell
48.666John Bell
37.853John Bell
52.000John Bell
Mazda RX-7 (1984)
EP
1
2:42.770Yuri Collazos
2:42.770Yuri Collazos
2:55.543Yuri Collazos
106.9Yuri Collazos
1:01.897Yuri Collazos
47.018Yuri Collazos
1:03.362Yuri Collazos
Mazda Miata
EP
6
2:02.786Matt Reynolds
2:02.786Matt Reynolds
2:03.049Matt Reynolds
138.2Rick Kavitski
45.603Joe Carr
34.398Joe Carr
49.056Joe Carr
Mazda Miata
EP
4
2:02.786Matt Reynolds
2:02.786Matt Reynolds
2:03.049Matt Reynolds
138.2Rick Kavitski
45.603Joe Carr
34.398Joe Carr
49.056Joe Carr
Mazda Miata (1995)
EP
1
2:10.492Don Tucker
2:10.492Don Tucker
2:11.559Don Tucker
132.0Don Tucker
45.952Don Tucker
34.407Don Tucker
49.365Don Tucker
Mazda Miata (1993)
EP
1
2:15.094Mark Weber
2:15.094Mark Weber
2:18.808Mark Weber
126.2Mark Weber
47.156Mark Weber
36.365Mark Weber
50.613Mark Weber
Caterham 7 America
EP
2
2:02.850Peter Norton
2:04.223Peter Norton
2:02.850Peter Norton
133.9Miner Wilcox
Nissan 260Z
EP
1
2:03.132Greg Ira
2:03.200Greg Ira
2:03.132Greg Ira
144.6Greg Ira
Lotus Caterham 7 America
EP
1
2:04.201Peter Norton
2:05.502Peter Norton
2:04.201Peter Norton
134.6Peter Norton
44.153Peter Norton
32.709Peter Norton
47.113Peter Norton
Mazda RX-3
EP
2
2:05.018Aaron Downey
2:05.018Aaron Downey
2:05.493Aaron Downey
140.1Aaron Downey
BMW 325i/is (E30)
EP
1
2:05.089Tim Schreyer
2:05.089Tim Schreyer
2:33.677Tim Schreyer
135.1Tim Schreyer
44.279Tim Schreyer
33.423Tim Schreyer
47.165Tim Schreyer
Mazda MX-5
EP
2
2:05.250Joe Moser
2:05.250Joe Moser
2:05.320Joe Moser
139.2Joe Moser
46.879Steve Shelton_Jr
35.293Steve Shelton_Jr
50.217Steve Shelton_Jr
BMW Z3 2.8L
EP
2
2:08.547James Rogerson
2:08.547James Rogerson
2:12.066James Rogerson
136.9James Rogerson
48.121Mark Bradley
37.555Mark Bradley
52.103Mark Bradley
BMW Z3 2.8L
EP
1
2:08.547James Rogerson
2:08.547James Rogerson
2:12.066James Rogerson
136.9James Rogerson
BMW Z3 2.8L (1998)
EP
1
2:17.779Mark Bradley
2:17.779Mark Bradley
128.2Mark Bradley
48.121Mark Bradley
37.555Mark Bradley
52.103Mark Bradley
Triumph TR8
EP
1
2:08.975Jeff Young
2:08.975Jeff Young
2:09.963Jeff Young
137.2Jeff Young
46.652Jeff Young
34.700Jeff Young
48.679Jeff Young
Nissan 240Z
EP
2
2:10.174Heikki Silegren
2:10.304Heikki Silegren
2:10.174Heikki Silegren
139.6Heikki Silegren
46.143Heikki Silegren
34.978Heikki Silegren
48.988Heikki Silegren
Honda Civic Si
EP
1
2:11.210Greg Amy
2:11.210Greg Amy
2:17.957Greg Amy
131.8Greg Amy
49.582Greg Amy
37.342Greg Amy
51.033Greg Amy
Mazda RX-8
EP
2
2:11.898Steve Smyczek
2:11.980Steve Smyczek
2:11.898Steve Smyczek
131.4Steve Smyczek
47.828Steve Eckerich
36.474Steve Eckerich
51.172Steve Eckerich
Mazda RX-8
EP
1
2:11.898Steve Smyczek
2:11.980Steve Smyczek
2:11.898Steve Smyczek
131.4Steve Smyczek
Mazda RX-8 (2004)
EP
1
2:15.883Steve Eckerich
2:15.883Steve Eckerich
128.4Steve Eckerich
47.828Steve Eckerich
36.474Steve Eckerich
51.172Steve Eckerich
Nissan 240SX S13
EP
1
2:13.581Dan Rolfe
2:13.581Dan Rolfe
129.9Dan Rolfe
BMW 325i/is (E36)
EP
1
2:14.306Matthew Fritz
2:14.306Matthew Fritz
129.3Matthew Fritz
47.205Matthew Fritz
35.685Matthew Fritz
50.995Matthew Fritz
Acura Integra Type-R
EP
1
2:14.713Anthony Black
2:14.713Anthony Black
2:19.179Anthony Black
121.9Anthony Black
Triumph TR6
EP
1
2:15.654Sam Halkias
2:15.654Sam Halkias
2:45.702Sam Halkias
129.0Sam Halkias
47.467Sam Halkias
37.304Sam Halkias
50.555Sam Halkias
Ford Mustang
EP
1
2:15.873Ron Earp
2:15.873Ron Earp
126.7Ron Earp
47.969Ron Earp
36.641Ron Earp
50.932Ron Earp
Triumph GT6
EP
1
2:16.992Anthony Parker
2:16.992Anthony Parker
119.3Anthony Parker
48.136Anthony Parker
36.752Anthony Parker
52.104Anthony Parker
BMW 325i/is
EP
1
2:17.360David Spillman
2:17.360David Spillman
137.0David Spillman
51.331David Spillman
36.651David Spillman
49.378David Spillman
Triumph TR4
EP
1
2:41.505Dwight K Cooke JR
2:41.505Dwight K Cooke JR
91.7Dwight K Cooke JR
The best any driver of each car managed across the selected events, with who set it. Spellings and model years of the same car are grouped; click a row marked ▸ to see each version. Grouping is worked out from the names, so tell us if two cars are wrongly merged or split.
Rule changes between these events
Runoffs 2019 → Runoffs 2022 2019-10-05 to 2022-09-24
EP Re-organize Prep2 Cylinder Head Rules for Clarity & Consistency
#27661 from Production Committee · Rule change · TB 19-12 (2019-12 Fastrack)
neutralEP, FP, HP cylinder head rules reorganized for clarity; no performance change.
In Production, GCR section 9.1.5.E.2.e, delete section and replace as follows: e. The Cylinder Head can only be modified: 1. To install an alternate camshaft, and/or adjustable cam gears. 2. To port match on the port mating surface to a depth of no more than one inch. 3. To facilitate the installation of permitted alternate components, provided the modification serves no other function. 4. To achieve the maximum specified compression ratio by the machining of the deck surface. 5. To completely plug the holes resulting from the removal of EGR valves and air nozzles. The plugs must
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serve no other purpose. 6. To completely plug the stock fuel injection ports in the cylinder head, if the stock fuel injection is removed and carburetors are utilized. The plugs must serve no other purpose. 7. To utilize O-rings to replace or supplement a cylinder head gasket. 8. To fit valve seats. Valve seats are unrestricted. Valve seat angles are unrestricted. The valve seat insert can be no taller than one half inch. "e. Cylinder Head 1. The cylinder head may be modified to allow installation of permitted alternate components, provided the modification serves no other purpose. 2. Valve seats and valve seat angles are unrestricted. The valve seat may be no taller that one half inch. 3. The cylinder head deck surface may be machined to achieve the specified compression ratio and to allow the installation of o-rings to replace or supplement the cylinder head gasket. 4. Holes resulting from the removal of EGR valves, air nozzles and fuel injectors (if the stock fuel injection system is removed and carburetors substituted) may be plugged, provided the plugs serve no other purpose. 5. Cylinder head ports may be matched to the intake manifold to a depth of no more than 1 inch from the port mating surface."
EP Request to List Mazda Miata Throttle Body Size
#27907 from STEVE SARGIS · Rule change · TB 20-01 (2020-01 Fastrack)
neutralFP and EP Mazda Miata models standardized to 55mm throttle body diameter; brake spec clarified.
In FP, Mazda Miata 1.6L (90-97), make changes as follows: Brakes Std.: "Factory spec @ all 4 wheels (F) 235 x 18 Vented Disc (R) 231 x 9 Solid Disc" Throttle body Diameter: "stock throttle body I.D. 55mm" In EP, Mazda MX-5/Miata 1.6L (-1993), make changes as follows: Brakes Std.: "(F) 235 (9.3) x 18 Vented Disc (R) 231 (9.1) x 9 Solid Disc"
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Throttle body Diameter: "stock throttle body I.D. 55mm" In EP, Mazda MX-5/Miata 1.8L (90-97), make changes as follows: Brakes Std.: "(F) 235 ( 9.3) x 18 Vented Disc (R) 231 (9.1) x 9 Solid Disc" Throttle body Diameter: "stock throttle body I.D. 55mm" In EP, Mazda MX-5/Miata (94-97), make changes as follows: Brakes Std.: "(F) 235 x 18 Vented Disc (R) 231 x 9 Solid Disc" Throttle body Diameter: "stock throttle body I.D. 55mm" In EP, Mazda MX-5/Miata (99-03), make changes as follows: Brakes Std.: "(F) 235 (9.3) x 18 Vented Disc (R) 231 (9.1) x 9 Solid Disc" Throttle body Diameter: "stock throttle body I.D. 55mm"
EP Request for Help for Datsun 1200
#27934 from Ian Sullivan · Rule change · TB 20-02 (2020-02 Fastrack)
fasterHP Datsun 1200 carburetor choke size increases from 26mm to 30mm.
In HP Spec Lines, Nissan/Datsun 1200, make changes as follows in Carburetor No. & Type: "(1) 40 DCN, DCNF, IDF, 26mm choke(s) req’d. w/ 30mm choke(s), (2) auto type side draft w/ 30mm choke(s) on I.R. manifold."
EP Request to Review Horsepower Parity
#27662 from Kevin Koelemeyer · Rule change · TB 20-03 (2020-03 Fastrack)
slowerEP BMW Z3 2.5L compression ratio capped 12.0:1, valve lift .500, 59mm restrictor required; Z3 2.8L same limits added; 944S2 compression 12.0:1, valve lift .500, 56mm restrictor required.
In EP, BMW Z3 2.5L, change notes as follows: "Comp. Ratio limited to 12.0:1, Valve lift limited to .500”. To replace stock drive-by-wire throttle body, alternate throttle body from BMW 92-95 325i (part #13541748105) with Turner Motorsports adapter plate (part #TEN9990850) is permitted. 59mm Flat Plate Intake Restrictor is required with both stock or alternate throttle body. Alternate throttle body from BMW 92-95 325i part number 13541748105 permitted only with Turner Motorsports adapter plate part number TEN9990850 to replace drive-by- wire throttle body." In EP, BMW Z3 2.8L (97-00), add to the notes as follows:
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"Comp. Ratio limited to 12.0:1, Valve lift limited to .500”. 59mm Flat Plate Intake Restrictor is required." In EP, Porsche 944S2 (89-91), add to the spec line as follows: Fuel Injected Equipped Throttle Body Inside Diameter - "60mm" stock "Comp. Ratio limited to 12.0:1, Valve lift limited to .500”, Dry sump is allowed. 56mm Flat Plate Intake Restrictor is required. Can use the stock fuel tank if stock rear bumper and bumper support structure retained."
EP E36 (92-95) Brakes Errors and Omissions
#28058 from Charles Baader · Rule change · TB 20-03 (2020-03 Fastrack)
fasterEP BMW 325is M-Technic loses 100–105 lbs across three weight configurations, to 2550–2678.
In EP, BMW 325is M-Technic (1994), change as follows: Weight: "2650 2550 *2716 2614 **2783 2678" Brakes Std. "(F) (12.4 x 1.1) 286 vented"
EP Request to allow 40 DCOE carb for the Datsun 510
#28195 from James Bell · Rule change · TB 20-03 (2020-03 Fastrack)
In HP, Nissan/Datsun PL510, make changes to the spec line as follows: Carburetor No & Type: "(1) 40 DCN or, DCNF w/ 32mm choke(s),. 32mm choke(s) req'd, or (1) 36mm DCNVH. (2) auto type side draft(s) w/ 32mm choke(s) on I.R. manifold @ 90lbs penalty." Notes: "Compression ratio limited to 12.0:1, Valve lift limited to .450”. (2) auto type side drafts w/ 32mm choke(s) on I.R. manifold allowed @ 2050 (*2101 **2153). Nissan/Datsun 240Z/260Z/280Z front rotors and calipers and rear aluminum drums are permitted."
EP Add Throttle Body Size these EP BMW Spec Lines
#28422 from Production Committee · Rule change · TB 20-03 (2020-03 Fastrack)
slowerEP BMW fuel injected throttle body maximum inside diameter set to 64mm.
In EP, Fuel Injected Equipped Throttle Body Inside diameter, make changes as follows: Add "64" as maximum inside diameter and delete any other wording.
neutralEP Caterham 7 Spec Line removes redundant suspension note, clarifies engine prep limits and comp ratio to 10.0:1.
In EP, modify the "Notes" section of the "Lotus/Caterham 7 America" spec line as follows: "Level 2 suspension preparation. Engine is limited to IT preparation except modifications permitted in sections 9.1.5.E.2.e., 9.1.5.E.2.f, and 9.1.5.E.2.h. and f. Comp. Ratio limited to 10.0: 1, Valve lift limited to .380”." Note that the "Level 2 suspension preparation" limitation is already mandated by the fact that this is a "Prep Level 2" classified vehicle. Removal of that wording from the "Notes" section is purely due to redundancy, and not to change the allowed preparation.
EP Request to Classify 1990-1994 Mazda Protege
#28381 from Nick Leone · Rule change · TB 20-05 (2019-05 Fastrack)
neutral1990-1994 Mazda Protege classified in FP Pre at 2150–2258 lbs with 1839cc DOHC engine, fuel injection.
In FP, Classify the 90-94 Mazda Protege as follows:
A specification table follows in the original; it is not shown here.
EP Error in Mini Cooper Spec Line
#28713 from Frank Schwartz · Rule change · TB 20-05 (2019-05 Fastrack)
neutralHP Mini Cooper model year ranges for convertibles revised: 02-06 now includes 05-08, 07-13 now includes 09-15.
In HP Spec Lines, change as follows: "Mini Cooper (includes convertible) (02-06) (includes 05-08 convertible)" In HP Spec Lines, change as follows: "Mini Cooper (includes convertible) (07-13) (includes 09-15 convertible)"
EP BMW Cylinder Head Casting and Part Numbers
#28708 from Bill Lamkin · Rule change · TB 20-06 (2020-06 Fastrack)
slowerEP BMW 2.8L, 328i E36/E46, and 325i E36 blocks now iron only; 325i E46 aluminum only.
In EP, correct the following spec lines as shown: BMW Z3 2.5L, add to "Notes" section: "Cylinder head casting number 1738400 permitted with use of the allowed iron block (casting number 1748933-C)." BMW Z3 2.8L (97-00), modify "Block Mat'l" section: "Alum or Iron" BMW 328i/is E36 (96-99), modify "Block Mat'l" section: "Alum or Iron"
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BMW 328i/ci E46 (01-06), modify "Block Mat'l" section: "Alum or Iron" BMW 325i/is E46 (01-06), modify "Block Mat'l" section: "Alum or Iron" BMW 325i/is E36 (92-95), modify "Block Mat'l" section: "Alum or Iron"
EP Request to Classify Porsche 911 2.0L
#28456 from Richard Spritz · Rule change · TB 20-07 (2020-07 Fastrack)
neutralPorsche 911 S 67-68 classified in EP at three weight levels: 1800, 1845, or 1890 lbs.
In EP, classify the Porsche 911 S (67-68) as follows:
A specification table follows in the original; it is not shown here.
EP EP BMW Z3 Rule Clarification
#28998 from Sam Moore · Rule change · TB 20-08 (2020-08 Fastrack)
neutralEP BMW Z3 2.5L iron block casting 1738566-C designation removed, wording clarification only.
In EP, BMW Z3 2.5L, make changes to the spec line as follows: "Cylinder head casting number 1738400 permitted with use of the allowed iron block (casting number 1748933 or 1738566-C).
EP 84-87 Toyota Corolla HP Wheel Diameter Allowance Proposal E&O
#29458 from Brian Harmer · Rule change · TB 20-10 (2020-10 Fastrack)
fasterHP 84-87 Toyota Corolla wheel diameter increases from 13 to 15 inches.
In HP, Spec Lines, Toyota Corolla (84-87), change Wheels as follows: "13 15 x 7"
EP Mk2 VW Consistency and Cleanup of FP and HP Spec Lines
#29195 from Christopher Schaafsma · Rule change · TB 20-12 (2020-12 Fastrack)
fasterFP Volkswagen Golf and Jetta 1.8 lose 50 lbs each, to 1900. HP Jetta GLI engine code removed.
In Production, Spec Lines, Change as follows: In FP: "Volkswagen Golf 1.8 (GTI, GT, GL) (85-92)" Weight: "1950 1900" In FP: "Volkswagen Jetta
EP Correct Wording for Level 1 and Level 2 Induction Systems
#29406 from Ron Bartell · Rule change · TB 20-12 (2020-12 Fastrack)
neutralEP, FP, HP Level 1 and Level 2 induction systems: clarified carburetor and fuel injection rules, jets/needles/rods unrestricted in Level 2.
In Production, GCR section 9.1.5.E.1.b.1, make changes as follows: "All inducted air must pass through the venturi(s) of the car’s carburetor(s). Any carburetor(s) with restricted venturi(s) must retain such venturi(s) in the original location within the carburetor. The throttle plate, shaft location, and bore diameter (as measured at the throttle plate) shall remain as specified. Carburetor jets, jet needles, metering rods and needle valves are unrestricted. Choke mechanisms, plates, rods, and actuating cables, wires, or hoses can be removed. The number and type of carburetors must not be changed from stock, unless otherwise specified by the vehicles spec line. In all other regards, standard and approved optional carburetor(s) are unrestricted. All single carbureted cars may fit a permitted optional carburetor. Where the use of one (1) 40 DCN, DCNF, IDF carburetor is
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specified, a permitted optional carburetor may be substituted. Permitted optional carburetors are:" In GCR section 9.1.5.E.1.b.4, make changes as follows: "Fuel injection: All inducted air must pass through the throttle body and be subject to control by the throttle butterfly. The stock throttle body casting/housing must be retained. The inside dimensions of the throttle body casting/housing (as measured at the throttle butterfly) and all dimensions of the throttle butterfly must remain stock, but . T the throttle body can otherwise be ported and polished. The dimensions of the throttle butterfly must remain stock. The throttle butterfly shaft shall not be relocated. The outside diameter of the portion of the throttle butterfly shaft located in the throttle body bore must be no smaller than stock. The contour of the interface between the throttle butterfly shaft and the butterfly must remain stock. The throttle butterfly and any throttle butterfly to shaft screws/bolts can be attached to the throttle butterfly shaft by any means including welding or brazing. Holes or slots can be created in the throttle butterfly for purposes of idle adjustment only. The number of injectors must remain stock. The mounting position and the injection point must be stock. Electronic fuel injection may be substituted for the stock type of fuel injection. In all other respects the fuel injection system is unrestricted." In GCR section 9.1.5.E.2.b.1, make changes as follows: "All inducted air must pass through the venturi(s) of the car’s carburetor(s). Carburetor jets, jet needles, metering rods and needle valves are unrestricted. Choke mechanisms, plates, rods, and actuating cables, wires, or hoses can be removed. The number and type of carburetors must not be changed from stock, unless otherwise specified by the vehicles spec line. In all other regards, standard and approved optional carburetor(s) must not be modified. All single carbureted cars may fit a permitted optional carburetor. Where the use of one (1) 40 DCN, DCNF, IDF carburetor is specified, a permitted optional carburetor may be substituted. Permitted optional carburetors are:"
EP Weight Reduction for Datsun Roadster
#29409 from Samuel Neave · Rule change · TB 20-12 (2020-12 Fastrack)
fasterEP Datsun SRL 311U Roadster minimum weight reduced to 1925 lbs from 2000 lbs.
In EP Spec Line, Nissan/Datsun SRL 311U Roadster, change Weight as follows: "2000 1925"
EP EP TR8 Adjustment
#29512 from Jeffrey Young · Rule change · TB 20-12 (2020-12 Fastrack)
fasterEP Triumph TR8 78-81 weight reduced from 2600 to 2500 lbs.
In EP Spec Lines, Triumph TR8 (78-81), change weight as follows: "2600 2500"
Applies to Triumph TR8 on this page: Jeff Young
EP Alternate Front Brake Rotors and Calipers for EP AH 3000
neutralEP Austin-Healey 3000 Mk. I, II, III now allows TR-6 front calipers and discs as alternate.
In EP, Spec Lines, Austin-Healey 3000 Mk. I, II, III, add to Brakes Alt.: mm/(in.) as follows: "Rear Disc: #H82462 Front calipers & discs from TR-6 (std. or alt)"
EP Please Classify Mazda3 in FP
#30165 from John MacGowan · Rule change · TB 21-04 (2021-04 Fastrack)
neutralMazda 3 S 04-08 classified in EP at 2350 lbs minimum, 2.26L DOHC, 12.0:1 compression, .500" valve lift limit.
In EP, classify Mazda 3 S (04-08) as follows:
A specification table follows in the original; it is not shown here.
EP Change Classification of 84-87 Mazda 626 from FP to HP
#30350 from David Reiter · Rule change · TB 21-05 (2021-05 Fastrack)
neutral84-87 Mazda 626 reclassified from FP to HP with 2300–2415 lbs weight, 1998cc SOHC, dual 32mm carbs.
In HP Spec Lines, classify Mazda 626 (84-87):
A specification table follows in the original; it is not shown here.
EP Fiat X1/9 brake rotors
#30423 from Daniel Snow · Rule change · TB 21-05 (2021-05 Fastrack)
neutralFP Fiat X1/9 brake rotors change to 257 (10.1) x 12 (.407) solid disc.
In FP Spec Line, Fiat X-1/9 & Bertone 1300, change Brakes Alt. as follows: "(F&R) 257 (10.0 1) x 12 (.40 7) Solid Disc (Lancia/Fiat)" In FP Spec Line, Fiat X-1/9 & Bertone, change Brakes Alt. as follows: "(F&R) Lancia 257 (9.875 10.1) x 12 (.40 7) Solid Disc (Lancia/Fiat)"
EP NC MX-5 year range correction E&O
#30503 from Josh Smith · Rule change · TB 21-05 (2021-05 Fastrack)
neutralEP Mazda MX-5 year range corrected from 06-14 to 06-15.
In EP Spec Lines, Mazda MX-5 (06-14) change as follows: "(06-14 5)"
Applies to Mazda MX-5 on this page: Joe Moser, Steve Shelton_Jr
EP Clarify Application of Percentage Based Weight Penalties
#30669 from Production Committee · Rule change · TB 21-06 (2021-06 Fastrack)
slowerEP, FP, HP clarifies percentage weight penalties sum first, then apply to base weight, rounding to nearest pound.
In GCR, Section 9.1.5.C. add as follows: "5. For percentage-based weight penalties, all applicable percentage values shall be summed first, and then applied to the vehicle’s minimum specified base weight, as listed in the PCS. The minimum vehicle weight shall be rounded to the nearest pound. For example, a car with a 1950lbs minimum specified base weight, that’s running a non-stock gear-engagement transmission and non-stock brake rotors and/or calipers, would calculate its minimum weight as follows: 5% transmission penalty + 2% brakes penalty = 7% total penalty 7% total penalty * 1950 lbs base weight = 2086.5 lbs 2086.5 lbs rounded to nearest pound = 2087 lbs minimum weight"
EP Lotus/Caterham 7 America Request
#30392 from Larry Svaton · Rule change · TB 21-07 (2021-07 Fastrack)
unclearEP Lotus/Caterham 7 America carburetor changed from IT fuel injection prep to fuel injection.
In EP Spec Lines, Lotus / Caterham 7 America, change as follows: Carburetor No. & Type: "IT fuel injection prep Fuel injection" Notes: "Engine is limited to IT preparation except modifications permitted in sections 9.1.5.E.2.e, 9.1.5.E.2.f, and 9.1.5.E.2.h."
Applies to Lotus Caterham 7 America on this page: Peter Norton
EP Reclassify Daimler SP 250
#30721 from William Jarrell · Rule change · TB 21-07 (2021-07 Fastrack)
neutralDaimler SP 250 classified in EP at 2165 lbs with 2548 cc OHV 8-cylinder engine.
In EP Spec Lines, classify Daimler SP 250, as follows:
A specification table follows in the original; it is not shown here.
EP Request to Allow F22c Engine for 2000-2003 Honda S2000
#30548 from Michael Unger · Rule change · TB 21-08 (2021-08 Fastrack)
unclearHonda S2000 (00-03) reclassified as EP Prep with F22c engine option: 1997cc or 2157cc, weight 2450–2636 lbs depending on displacement.
In EP Spec Lines, delete Honda S2000 (00-03) and Honda S2000 (04-09) in their entirety. In EP Spec Lines, classify Honda S2000 as follows:
A specification table follows in the original; it is not shown here.
neutralHP Toyota MR-2 1.6L (85-89) track corrected to 15.47 inches front and rear.
In the HP "Toyota MR-2 1.6L (85-89)" spec line, please correct the Track column as follows: "1532 47 / 1532 47" In GCR, Section 9.1.5.C.4, please change as follows: "Track specifications will be set at 103% of the car’s stock track, plus 2.5 inches."
EP 944S2 Restrictor
#31396 from KEVIN Patterson · Rule change · TB 21-12 (2021-12 Fastrack)
slowerEP Porsche 944S2 89-91 requires 56mm flat plate intake restrictor; comp ratio max 12.0:1, valve lift max 0.500".
In EP Spec Lines, Porsche 944S2 (89-91), change Notes as follows: "Comp. Ratio limited to 12.0:1, Valve lift limited to .500”, Dry sump is allowed. 56mm Flat Plate Intake Restrictor is required. In order to facilitate the installation of the FPR, additional spacers/plates may be added to convert the mating area of the throttle body and the intake manifold into a flat surface. These pieces must maintain the stock 60mm throttle body bore, the FPR must be a separate piece that can be independently removed and measured, and the total thickness of all pieces (including the FPR) cannot add up to more than 1” in thickness. Can use the stock fuel tank if stock rear bumper and bumper support structure retained."
EP Classing Clarification for 1986 Toyota Corolla FX16
#31527 from Brian Heffron · Rule change · TB 21-12 (2021-12 Fastrack)
neutralHP Corolla GTS RWD (84-87) added at 2300 lbs; HP Corolla FX16 FWD (87-88) added at 2260 lbs; old Corolla (84-87) removed.
In HP Spec Lines, delete the Toyota Corolla (84-87) Spec Line in its entirety. In HP Spec Lines, classify the Toyota Corolla GTS (RWD) (84-87):
A specification table follows in the original; it is not shown here.
EP Porsche 968 Engine Questions
#31478 from Hayes Flynn · Rule change · TB 22-01 (2022-01 Fastrack)
fasterEP Porsche 968 intake valve size increased from 37 to 39.0 mm.
In EP Spec Lines, Porsche 968 (92-95), change Intake Valve size as follows: "(I) 37 39.0/(1.46 54)"
EP PCS E. 2. n. 4. Add Axle Shaft to Allow FWD the Same Freedom
#31592 from Chris Schaafsma · Rule change · TB 22-01 (2022-01 Fastrack)
neutralEP, FP, HP front-wheel-drive cars may alter body and suspension to install alternate transmission, transaxle, and axle shaft.
In Production, GCR sections 9.1.5.E.1.n.4. and 9.1.5.E.2.n.4. change as follows: "For rear wheel drive cars, the transmission tunnel and tunnel cover can be altered to allow the installation of an alternate transmission and/or driveshaft. For front wheel drive cars, the body, unibody, frame, suspension crossmembers/subframes and their components may be altered to the extent required to allow the installation of an alternate transmission, transaxle and/or driveshaft axle shaft."
EP BMW Z3 2.5L Spec Line
#31724 from William Etherington · Rule change · TB 22-01 (2022-01 Fastrack)
neutralEP BMW Z3 2.5L allows alternate throttle body from 92-95 325i with Turner adapter; head casting 1738400 permitted with specific blocks.
In EP Spec Lines, BMW Z3 2.5L, change Notes as follows: "Comp. Ratio Limited to 12.0:1, Valve lift limited to .500”. To replace stock drive-by-wire throttle body, a Alternate throttle body from BMW 92-95 325i (part #13541748105) is permitted only with Turner Motorsports adapter plate (part #TEN9990850) is permitted. Cylinder head casting number 1738400 permitted with use of the allowed iron block (casting number 1748933 or 1738566)."
Applies to BMW Z3 2.5L on this page: Jesse Prather, Kevin Leigh, Darryl Pritchett, Greg Ira, Jon Brakke, Doug Piner
Applies to BMW Z3 2.8L on this page: James Rogerson, Mark Bradley
EP Throttle Body and Idle Air
#31800 from David Boles · Rule change · TB 22-02 (2022-02 Fastrack)
neutralEP, FP, HP classes allow stock/original idle control devices unmodified or completely removed with openings blocked.
In GCR, Section 9.1.5.E.1.b.1., change as follows: “All inducted air must pass through the venturi(s) of the car’s carburetor(s), except that which passes through a stock/original idle control device.“ In GCR, Section 9.1.5.E.1.b.4., change as follows: “Fuel injection: All inducted air must pass through the throttle body and be subject to control by the throttle butterfly), except that which passes through a stock/original idle control device.“ In GCR, Section 9.1.5.E.1.b., add the following: ”9. Stock/original idle control devices can be utilized in their original, unmodified location and condition, or completely removed
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and any resulting openings blocked off. “ In GCR, Section 9.1.5.E.2.b.1., change as follows: “All inducted air must pass through the venturi(s) of the cars carburetor(s), except that which passes through a stock/original idle control device. “ In GCR, Section 9.1.5.E.2.b.4., change as follows: “Fuel Injection: All inducted air must pass through the throttle body and be subject to control by the throttle butterfly), except that which passes through a stock/original idle control device. “ In GCR, Section 9.1.5.E.2.b., add the following: “9. Stock/original idle control devices can be utilized in their original, unmodified location and condition, or completely removed and any resulting openings blocked off. “
EP Porsche 968 Engine Questions
#31831 from Hayes Flynn · Rule change · TB 22-02 (2022-02 Fastrack)
neutralEP Porsche 968 (92-95) now allows dry sump.
In EP spec line "Porsche 968 (92-95)", add to Notes: "Dry sump is allowed."
EP Request weight reduction for 1979-1985 Mazda RX-7
#31833 from RON OLSEN · Rule change · TB 22-02 (2022-02 Fastrack)
fasterEP 1979-1985 Mazda RX-7 12A and 13B weight reduced by 50-53 lbs across all configurations.
In EP Spec Lines, Mazda RX-7 (12A/13B) (79-85), change Weight as follows:
A specification table follows in the original; it is not shown here.
Applies to Mazda RX-7 on this page: Austin Bradshaw, James Lindenthal, Charles Vaccaro, Donald Walsh, Anthony Parker, Yuri Collazos
EP 1999 3.8L Ford Mustang to EP?
#31635 from Chris Dercole · Rule change · TB 22-03 (2022-03 Fastrack)
fasterFord Mustang 99-03 classified to EP at 2700/2768/2835 lbs; 94-98 Mustang weight reduced to 2550/2614/2678 lbs.
In EP Spec Lines, Ford Mustang (94-98), change weight as follows: "2700 2550 *2768 2614 **2835 2678" In EP Spec Lines, classify Ford Mustang (99-03) as follows:
A specification table follows in the original; it is not shown here.
Applies to Ford Mustang on this page: Ron Earp
EP EP Adjustments
#31858 from Production Committee · Rule change · TB 22-01 (2022-01 Fastrack)
slowerEP BMW Z3 2.5L intake restrictor reduced from 59mm to 58mm flat plate.
Effective 3/1/2022 In EP, make changes to BMW spec lines as follows: BMW Z3 2.5L - 59 58mm Flat Plate Intake Restrictor is required with both stock or alternate throttle body. BMW 328i/is E36 (96-99) - 62mm Flat Plate Intake Restrictor is required. BMW 328i/ci E46 (01-06) - 62mm Flat Plate Intake Restrictor is required. BMW 325i/is E46 (01-06) - 60mm Flat Plate Intake Restrictor is required. BMW 325i/is E36 (92-95) - 60mm Flat Plate Intake Restrictor is required. BMW 325is M-Technic (1994) - 60mm Flat Plate Intake Restrictor is required.
neutralEP, FP, HP Improved Touring cars may use any DOT-approved tire per section 9.3.45 in Production class.
In Production, GCR Section 9.1.5.B.5, change as follows: "Any Improved Touring car meeting all the requirements of ITCS 9.1.3 may compete in the Production class in which the same make, model and engine displacement car is classified. For Improved Touring cars competing in Production, the level of preparation and modifications will be as determined by ITCS 9.1.3 and not by PCS 9.1.5, however any DOT approved tire as defined by 9.3.45 is allowed."
EP Mazda RX8 with 13b Rotary
#32170 from John Warren · Rule change · TB 22-04 (2022-04 Fastrack)
In EP Spec Lines, Mazda RX-8 (04-11) (alternate), make the following changes to Carburetor. No. & Type: "Renesis: Fuel Injection. 13B: d (1) Auto-type 2 bbl carb w/ 42mm choke(s) on a “dual-y” manifold, (1) 2 bbl fuel injected throttle body w/ 42mm choke(s) on a “dual-y” manifold, or stock 13B fuel injection."
Applies to Mazda RX-8 on this page: Steve Smyczek, Steve Eckerich
EP Request Idle control valve clarification
#32178 from Joe Camilleri · Rule change · TB 22-04 (2022-04 Fastrack)
neutralEP and FP Production clarifies idle control valve rules: stock devices allowed original, removed with blocked ports, or mechanical replaced with electronic stock type.
In Production, GCR Section 9.1.5.E.1.b.9, add the following: "Stock/original idle control devices can be utilized in their original, unmodified location and condition, or completely removed and any resulting openings blocked off. A mechanical stock/original idle control device can be replaced with an electronic stock/original type of idle control device, with the original mechanical idle ports in the throttle body blocked off." In Production, GCR Section 9.1.5.E.2.b.9, add the following: "Stock/original idle control devices can be utilized in their original, unmodified location and condition, or completely removed and any resulting openings blocked off. A mechanical stock/original idle control device can be replaced with an electronic stock/original type of idle control device, with the original mechanical idle ports in the throttle body blocked off."
EP EP MX-5 Global Cup Car
#32218 from Production Committee · Rule change · TB 22-03 (2022-03 Fastrack)
slowerEP Mazda MX-5 Global Cup 16-22 minimum weight set to 2400 lbs; sequential gearbox allowed with +150 lbs penalty.
Effective 05/01/2022 In EP Spec Lines, Mazda MX-5 Global Cup (16-22), change as follows: Weight (lbs): "see notes 2400" Notes: "Car preparation is limited to what is permitted by the MX-5 Global Cup rules, and the car must meet all MX-5 Global Cup rules except as otherwise indicated within this spec line. Competitors must have the current MX-5 Global Cup rules in their possession and present them upon request. Sequential gearbox is allowed with +150lbs."
Applies to Mazda MX-5 on this page: Joe Moser, Steve Shelton_Jr
EP Please Class BMW 128i in EP
#32370 from Mark Uhlmann · Rule change · TB 22-05 (2022-04 Fastrack)
neutralBMW 128i (08-13) classified in EP at 2700 lbs minimum with stock throttle body, 11.0:1 compression ratio, 0.400 in. valve lift limits.
In EP Spec Lines, classify the BMW 128i (08-13) as follows:
A specification table follows in the original; it is not shown here.
EP Inconsistency in Body Work Descriptions
#32396 from Production Committee · Rule change · TB 22-05 (2022-04 Fastrack)
fasterEP/FP/HP open cars may now use carbon fiber hardtops if they retain OEM appearance in all exterior profiles.
In Production Category Specifications, GCR Section 9.1.5.E.9.a.12 change as follows: "Open cars must remove convertible soft tops and all attaching bracketry and hardware. If the stock windshield is retained, OEM and aftermarket hardtops are allowed. Aftermarket hardtops must retain OEM appearance in all exterior profiles, and carbon fiber construction is not allowed. Any hardtop must be attached by positive fasteners."
EP Subaru BRZ Model Years
#32500 from Steve Gaetjens · Rule change · TB 22-06 (2022-06 Fastrack)
neutralEP Subaru BRZ and Toyota 86/Scion FR-S model year ranges updated to 13-20.
In EP Spec Lines, Subaru BRZ (2013), change title changes: "Subaru BRZ (13 - 20)" In EP Spec Lines, Toyota Scion FR-S (2013), change title changes: "Toyota 86 / Scion FR-S (13 - 20)"
EP Request to classify VW New Beetle 2.5L in EP
#32725 from G. Metcalf · Rule change · TB 22-09 (2022-09 Fastrack)
neutralVW New Beetle 2.5L 5-cyl added to EP at 2400–2520 lbs, 2480 cc, fuel injection, comp ratio 12.0:1 max, valve lift 0.500" max.
In EP Spec Lines, classify Volkswagen New Beetle (06-11) as follows:
A specification table follows in the original; it is not shown here.
EP Request Rotary Injection on Dual Y manifold
#32775 from James Lindenthal · Rule change · TB 22-09 (2022-09 Fastrack)
unclearEP Mazda RX-7 12A/13B gains fuel injection option on dual-y manifold with 42mm choke(s).
Effective November 1, 2022, in EP Spec Lines, change Carburetor. No. & Type as follows: Mazda RX-7 (12A/13B) (79-85): "12A: (1) Nikki 4 bbl carburetor w/ primary choke(s) bored to match secondary choke(s) on a stock manifold or (1) Auto-type 2 bbl w/42mm choke(s) on a “dual-y” manifold. 13B: (1) Auto-type 2 bbl w/ 42mm choke(s) on a “dual-y” manifold, (1) 2 bbl fuel injected throttle body w/ 42mm choke(s) on a “dual-y” manifold, or stock 13B fuel injection." Mazda RX-7 (13B) (86-91): "(1) Auto-type 2 bbl w/ 42mm choke(s) on a “dual-y” manifold, (1) 2 bbl fuel injected throttle body w/ 42mm choke(s) on a “dual- y” manifold, or stock 13B fuel injection."
EP Request for Corrado Stroke & Displacement Correction
#32985 from Douglas Hedges · Rule change · TB 22-09 (2022-09 Fastrack)
neutralEP VW Corrado 92-95 stroke corrected to 90.3 mm, displacement to 2792 cc.
In EP Spec Line, VW Corrado (92-95), change as follows: Bore x Stroke mm/(in.): "81.0 x 90.4 3 (3.19 x 3.56)" Displ. cc/(ci) (nominal): "278 92"
Runoffs 2022 → Runoffs 2023 2022-09-24 to 2023-09-23
EP Revise 79-85 RX7 Brake Spec Line Allowance
#33293 from David Mead · Rule change · TB 23-01 (2023-01 Fastrack)
In EP Spec Line, Mazda RX-7 (12A/13B) (79-85), change Notes as follows: "Level 1 dry sump, intake manifold porting permitted. Alternate multi-piece hub and rotor allowed provided they are of the same dimensions as original and weigh a minimum of 10.2 lbs. 13B (only): Any 13B rotor housing and any non-turbo 6-port side and/or intermediate housing permitted. Use of differential from 94-97 Mazda MX-5/ Miata permitted."
Applies to Mazda RX-7 on this page: Austin Bradshaw, James Lindenthal, Charles Vaccaro, Donald Walsh, Anthony Parker, Yuri Collazos
EP Request alternate carburetors for EP 280z
#33405 from Joe Harlan · Rule change · TB 23-01 (2023-01 Fastrack)
neutralEP Mazda RX-2, RX-3, RX-4, and 12A RX-7 now allow 2 bbl fuel injected throttle body w/ 42mm chokes on dual-y manifold.
In EP Spec Lines, Mazda RX-2, change Carburetor. No. & Type as follows: "(1) Nikki 4 bbl carburetor w/ primary choke(s) bored to match secondary choke(s) on a stock manifold, or (1) Auto-type 2 bbl w/ 42mm choke(s) on a “dual-y” manifold”, or (1) 2 bbl fuel injected throttle body w/42mm choke(s) on a “dual-y” manifold." In EP Spec Lines, Mazda RX-3 & 3SP (72-78), change Carburetor. No. & Type as follows: "(1) Nikki 4 bbl carburetor w/ primary choke(s) bored to match secondary choke(s) on a stock manifold, or (1) Auto-type 2 bbl w/ 42mm choke(s) on a “dual-y” manifold”, or (1) 2 bbl fuel injected throttle body w/42mm choke(s) on a “dual-y” manifold." In EP Spec Lines, Mazda RX-4 (74-78), change Carburetor. No. & Type as follows: "(1) Nikki 4 bbl carburetor w/ primary choke(s) bored to match secondary choke(s) on a stock manifold, or (1) Auto-type 2 bbl w/
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42mm choke(s) on a “dual-y” manifold” In EP Spec Lines, Mazda RX-7 (12A/13B) (79-85), change Carburetor. No. & Type as follows: "12: (1) Nikki 4 bbl carburetor w/ primary choke(s) bored to match secondary choke(s) on a stock manifold, or (1) Auto-type 2 bbl w/ 42mm choke(s) on a “dual-y” manifold”, or (1) 2 bbl fuel injected throttle body w/42mm choke(s) on a “dual-y” manifold. 13B: (1) Auto-type 2 bbl w/ 42mmchoke(s) on a “dual-y” manifold, (1) 2 bbl fuel injected throttle body w/42mm choke(s) on a “dual-y” manifold, or stock 13B fuel injection."
Applies to Mazda RX-3 on this page: Aaron Downey, Don Girven
Applies to Mazda RX-7 on this page: Austin Bradshaw, James Lindenthal, Charles Vaccaro, Donald Walsh, Anthony Parker, Yuri Collazos
fasterEP Mazda RX-2, RX-3, RX-3SP, and RX-4 minimum weights reduced 50–52 lbs across all spec lines.
In EP Spec Lines, Mazda RX-2, change Weight as follows: "1950 1900 *1999 1948 **2048 1995" In EP Spec Lines, Mazda RX-3 & 3SP (72-78), change Weight as follows: "1950 1900 *1999 1948 **2048 1995"
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In EP Spec Lines, Mazda RX-4 (74-78), change Weight as follows: "2100 2050 *2153 2101 **2205 2153"
Applies to Mazda RX-3 on this page: Aaron Downey, Don Girven
EP Request TR8 Dry Sump Allowance
#33460 from Jeff Young · Rule change · TB 23-01 (2023-01 Fastrack)
fasterEP Triumph TR8 78-81 now allowed to run dry sump.
In EP Spec Lines, Triumph TR8 (78-81), add to Notes as follows: "Dry sump is allowed."
Applies to Triumph TR8 on this page: Jeff Young
EP Review Limited Prep Port Matching Rules
#33600 from Production Committee · Rule change · TB 23-01 (2023-01 Fastrack)
neutralEP, FP, HP cylinder head ports limited to 1 inch maximum depth matching from mating surface.
In Production Category Specifications, GCR section 9.1.5.E.2.e.5., change as follows: "Cylinder head ports may be matched to the intake and exhaust manifolds to a depth of no more than 1 inch from the port mating surface."
EP 280ZX Classification Request
#33611 from Bill Coffey · Rule change · TB 23-01 (2023-01 Fastrack)
A specification table follows in the original; it is not shown here.
EP Investigate Parity of Z3
#33343 from Tim Schreyer · Rule change · TB 23-01 (2023-01 Fastrack)
slowerEP BMW Z3 2.5L intake restrictor reduced from 58mm to 56mm flat plate.
Effective 4/1/2023 In EP Spec Line BMW Z3 2.5L, change Notes as follows: "58 56mm Flat Plate Intake Restrictor is required with both stock or alternate throttle body."
fasterEP Porsche 914-6 2.0L intake valves increase to 2.0 mm, exhaust valves corrected to 38.0 mm.
In EP Spec Lines, Porsche 914 - 6 2.0L, change Valves IN & EX mm/(in.) as follows: "(I) 41.9 2.0/(1.65) (E) 38.1 0/(1.50)"
EP Correct Intake Valve Size on 1500cc Midget/Spitfire
#34419 from Production Committee · Rule change · TB 23-06 (2023-05 Fastrack)
neutralFP and HP Sprite, Midget, and Spitfire 1500 intake valve size corrected to 36.6/(1.44).
In FP Spec Lines, Austin-Healey Sprite Mk. I, II,III, IV MG Midget Mk I,II, III, IV & 1500, change Intake Valve Size as follows: "(I) 36.65.3/(1.44)" In FP Spec Lines, Triumph Spitfire Mk. IV & 1500, change Intake Valve Size as follows: "(I) 36.65.5/(1.440)" In HP Spec Lines, Triumph Spitfire 1500, change Intake Valve Size as follows: "(I) 36.65.5/(1.440)" In HP Spec Lines, Triumph Spitfire Mk. III & IV 1500, change Intake Valve Size as follows: "(I) 36.65.5/(1.440)"
EP Hub Note Clean Up In EP TR8 Spec Line
#34649 from Jeff young · Rule change · TB 23-09 (2023-09 Fastrack)
neutralEP Triumph TR8 78-81 removes alternate front hub allowance note; stock hubs now required.
In the EP Spec Lines, Triumph TR8 (78-81), remove the following wording from Notes: "Alternate front hubs are allowed provided they are of the same external dimensions as stock and weigh no less than the stock hubs."
EP Triumph GT6 Adjustments
#34662 from ANTHONY PARKER · Rule change · TB 23-09 (2023-09 Fastrack)
unclearEP Triumph GT6 carburetors change from SU or Stromberg to 1.5" Auto-type.
In EP Spec Lines, Triumph GT6, change Carburetor. No. & Type as follows: "(2) 1.5” SU or Stromberg Auto-type carburetor(s)"
Applies to Triumph GT6 on this page: Anthony Parker
EP Triumph GT6 Adjustments: Brakes
#34663 from ANTHONY PARKER · Rule change · TB 23-09 (2023-09 Fastrack)
neutralEP Triumph GT6 brakes may now use TR-6 standard or alternate calipers and discs.
In EP Spec Lines, Triumph GT6, add the following to Brakes Alt.: mm/(in.): "(F) Calipers & discs from TR-6 (std. or alt)"
Applies to Triumph GT6 on this page: Anthony Parker
What the rules allowed changed as listed; this does not say what any particular car ran.