EP at Mid-Ohio Sports Car Course

2019-03-01 EP Request for Competition Adjustment for 2nd Generation RX7

#25935 from Tony Jimerson · Rule change · TB 19-03 (2019-03 Fastrack)

In EP, Mazda RX-7(12A/13B)(79-85), change the weights as follows:

A specification table follows in the original; it is not shown here.

2019-04-01 EP Rollcenter Correction Clarification

#25873 from Bill Lamkin · Rule change · TB 19-04 (2019-04 Fastrack)

Note from CRB: 9.1.5.E.5.b.2 in “Suspension and Steering Level 2: Suspension Components”
states that “Suspension control arms, bushings, bearings, and ball joints are unrestricted.”
However, allowance to ream out ANY tapered hole from a stock ball joint does not exist, unless
being done to a specifically unrestricted component, like a suspension control arm. This is not
the intent to restrict in that manner, and should be clarified:
In GCR section 9.1.5.E.5.b.2, add wording as follows:
“Suspension bushings, bearings, and ball joints are unrestricted. Tapered holes can be drilled
or reamed, to allow a bolt to be used in place of a ball joint.”

2019-04-01 EP Hardtops

#26476 from Production Committee · Rule change · TB 19-04 (2019-04 Fastrack)

In GCR section 9.1.5.E.9.a.12, remove wording as follows:
“Open cars must remove convertible soft tops, and attaching bracketry and fasteners. Open
cars retaining the stock windshield may retain the stock removable hardtop if attached to
the car by positive fasteners. 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.”
In EP, remove wording from spec line notes as follows:

2019-05-01 EP Allow Firewall Modification for Fitment of 13B into RX8

#26726 from Production Committee · Rule change · TB 19-05 (2019-05 Fastrack)

In EP, Mazda RX-8 (04-11) (alternate), add to notes as follows:
“Firewall may be modified as necessary for fitment of 13B into stock chassis engine mount
location. Firewall must be sealed in the area of the modification.”

2019-08-01 EP Request Miata Eligibility - 2003

#27121 from Gary Rose · Rule change · TB 19-08 (2019-08 Fastrack)

In EP, GCR section 9.1.5., Mazda MX-5/Miata, make changes as follows:
"(99-02 05)"

2019-08-31 EP Request bodywork for Austin Healey Bugeye Sprite MK1

#27106 from Gary Johnson · Rule change · TB 19-09 (2019-09 Fastrack)

In FP, Austin-Healey Sprite Mk I, II, III, IV / MG Midget Mk I, II, III, IV, & 1500, add to the notes as follows:
"Sprite Mk I only may replace exterior rear body work, aft of the cockpit and rearmost door opening, with
stock appearing components of an alternate material."
In HP, Austin-Healey Sprite Mk I, II, III, IV / MG Midget Mk I, II, III, IV, Prep 1, 948cc, add to the notes as
follows:
"Sprite Mk I only may replace exterior rear body work, aft of the cockpit and rearmost door opening, with
stock appearing components of an alternate material."
In HP, Austin-Healey Sprite Mk I, II, III, IV / MG Midget Mk I, II, III, IV, & 1500, Prep 1/2, 1275cc, add to

2019-08-31 EP Request to classify the GMX5 2019

#27263 from SCCA Staff · Rule change · TB 19-09 (2019-09 Fastrack)

In EP, Mazda MX-5 Global Cup, change the year as follows:
"(16-18 19)"

2019-08-31 EP level one susp. component rule

#27270 from Production Committee · Rule change · TB 19-09 (2019-09 Fastrack)

In Production, GCR section 9.1.5.E.4.e., change wording as follows:
"Suspension Spindles, hubs, bushings, bearings, and ball joints are unrestricted."

2019-08-31 EP Clarification of Carb Rules - Prep 1

#27300 from Production Committee · Rule change · TB 19-09 (2019-09 Fastrack)

In Production, GCR section 9.1.5.E.1.b., make changes as follows:
9.1.5.E.1.b – Drive Train Level 1, Induction System
“1. 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 of carburetors must not be changed from
stock, unless otherwise specified by the vehicles spec line. All single carbureted cars may fit a permitted
optional carburetor. On cars w Where the use of one (1) 40 DCN, DCNF, IDF carburetor is required
specified, a permitted optional carburetor may be substituted. Permitted optional carburetors are: can fit

A specification table follows in the original; it is not shown here.

2019-08-31 EP Clarification of Carb Rules - Prep 2

#27301 from Production Committee · Rule change · TB 19-09 (2019-09 Fastrack)

In Production GCR section 9.1.5.E.2.b.1., make changes as follows:
9.1.5.E.2.b.1., – Drive Train Level 2, Induction System
“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 of carburetors must not be changed from stock, unless
otherwise specified by the vehicles spec line. 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:

A specification table follows in the original; it is not shown here.

2019-12-01 EP Re-organize Prep2 Cylinder Head Rules for Clarity & Consistency

#27661 from Production Committee · Rule change · TB 19-12 (2019-12 Fastrack)

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

2020-01-01 EP Request to List Mazda Miata Throttle Body Size

#27907 from STEVE SARGIS · Rule change · TB 20-01 (2020-01 Fastrack)

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"

2020-02-01 EP Request for Help for Datsun 1200

#27934 from Ian Sullivan · Rule change · TB 20-02 (2020-02 Fastrack)

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."

2020-03-01 EP Request to Review Horsepower Parity

#27662 from Kevin Koelemeyer · Rule change · TB 20-03 (2020-03 Fastrack)

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:

2020-03-01 EP E36 (92-95) Brakes Errors and Omissions

#28058 from Charles Baader · Rule change · TB 20-03 (2020-03 Fastrack)

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"

2020-03-01 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."

2020-03-01 EP Add Throttle Body Size these EP BMW Spec Lines

#28422 from Production Committee · Rule change · TB 20-03 (2020-03 Fastrack)

In EP, Fuel Injected Equipped Throttle Body Inside diameter, make changes as follows:
Add "64" as maximum inside diameter and delete any other wording.

2020-04-01 EP Caterham 7 Spec Line

#28498 from Omer Norton · Rule change · TB 20-04 (2020-04 Fastrack)

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.

2020-05-01 EP Request to Classify 1990-1994 Mazda Protege

#28381 from Nick Leone · Rule change · TB 20-05 (2019-05 Fastrack)

In FP, Classify the 90-94 Mazda Protege as follows:

A specification table follows in the original; it is not shown here.

2020-05-01 EP Error in Mini Cooper Spec Line

#28713 from Frank Schwartz · Rule change · TB 20-05 (2019-05 Fastrack)

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)"

2020-06-01 EP BMW Cylinder Head Casting and Part Numbers

#28708 from Bill Lamkin · Rule change · TB 20-06 (2020-06 Fastrack)

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"

2020-07-01 EP Request to Classify Porsche 911 2.0L

#28456 from Richard Spritz · Rule change · TB 20-07 (2020-07 Fastrack)

In EP, classify the Porsche 911 S (67-68) as follows:

A specification table follows in the original; it is not shown here.

2020-08-01 EP EP BMW Z3 Rule Clarification

#28998 from Sam Moore · Rule change · TB 20-08 (2020-08 Fastrack)

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).

2020-10-01 EP 84-87 Toyota Corolla HP Wheel Diameter Allowance Proposal E&O

#29458 from Brian Harmer · Rule change · TB 20-10 (2020-10 Fastrack)

In HP, Spec Lines, Toyota Corolla (84-87), change Wheels as follows:
"13 15 x 7"

2020-12-01 EP Mk2 VW Consistency and Cleanup of FP and HP Spec Lines

#29195 from Christopher Schaafsma · Rule change · TB 20-12 (2020-12 Fastrack)

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

2020-12-01 EP Correct Wording for Level 1 and Level 2 Induction Systems

#29406 from Ron Bartell · Rule change · TB 20-12 (2020-12 Fastrack)

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

2020-12-01 EP Weight Reduction for Datsun Roadster

#29409 from Samuel Neave · Rule change · TB 20-12 (2020-12 Fastrack)

In EP Spec Line, Nissan/Datsun SRL 311U Roadster, change Weight as follows:
"2000 1925"

2020-12-01 EP EP TR8 Adjustment

#29512 from Jeffrey Young · Rule change · TB 20-12 (2020-12 Fastrack)

In EP Spec Lines, Triumph TR8 (78-81), change weight as follows:
"2600 2500"

2021-01-01 EP Alternate Front Brake Rotors and Calipers for EP AH 3000

#29893 from Rich Walke · Rule change · TB 21-01 (2021-01 Fastrack)

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)"

2021-04-01 EP Please Classify Mazda3 in FP

#30165 from John MacGowan · Rule change · TB 21-04 (2021-04 Fastrack)

In EP, classify Mazda 3 S (04-08) as follows:

A specification table follows in the original; it is not shown here.

2021-05-01 EP Change Classification of 84-87 Mazda 626 from FP to HP

#30350 from David Reiter · Rule change · TB 21-05 (2021-05 Fastrack)

In HP Spec Lines, classify Mazda 626 (84-87):

A specification table follows in the original; it is not shown here.

2021-05-01 EP Fiat X1/9 brake rotors

#30423 from Daniel Snow · Rule change · TB 21-05 (2021-05 Fastrack)

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)"

2021-05-01 EP NC MX-5 year range correction E&O

#30503 from Josh Smith · Rule change · TB 21-05 (2021-05 Fastrack)

In EP Spec Lines, Mazda MX-5 (06-14) change as follows:
"(06-14 5)"

Applies to Mazda MX-5 on this page: Nathan Nicholson, Chris Haldeman, Cam Ebben, Vaughn Mishko

2021-06-01 EP Clarify Application of Percentage Based Weight Penalties

#30669 from Production Committee · Rule change · TB 21-06 (2021-06 Fastrack)

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"

2021-07-01 EP Lotus/Caterham 7 America Request

#30392 from Larry Svaton · Rule change · TB 21-07 (2021-07 Fastrack)

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 on this page: Larry Svaton

2021-07-01 EP Reclassify Daimler SP 250

#30721 from William Jarrell · Rule change · TB 21-07 (2021-07 Fastrack)

In EP Spec Lines, classify Daimler SP 250, as follows:

A specification table follows in the original; it is not shown here.

2021-08-01 EP Request to Allow F22c Engine for 2000-2003 Honda S2000

#30548 from Michael Unger · Rule change · TB 21-08 (2021-08 Fastrack)

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.

2021-08-01 EP Request a review of the S14 240SX in EP.

#30873 from Brett Whisenant · Rule change · TB 21-08 (2021-08 Fastrack)

In EP Spec Lines, Nissan 240-SX S13/S14 (91-98), change as follows:
Weight (lbs):
"2600 2400
*2665 2460
**2730 2520"
Notes: "Comp. Ratio limited to 10.5:1 12.0:1. Valve lift limited to .450 500”."

2021-10-01 EP E&O; MR2 Track

#31120 from Greg Amy · Rule change · TB 21-10 (2021-10 Fastrack)

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."

2021-12-01 EP 944S2 Restrictor

#31396 from KEVIN Patterson · Rule change · TB 21-12 (2021-12 Fastrack)

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."

2021-12-01 EP Classing Clarification for 1986 Toyota Corolla FX16

#31527 from Brian Heffron · Rule change · TB 21-12 (2021-12 Fastrack)

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.

2022-01-01 EP Porsche 968 Engine Questions

#31478 from Hayes Flynn · Rule change · TB 22-01 (2022-01 Fastrack)

In EP Spec Lines, Porsche 968 (92-95), change Intake Valve size as follows:
"(I) 37 39.0/(1.46 54)"

2022-01-01 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)

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."

2022-01-01 EP BMW Z3 2.5L Spec Line

#31724 from William Etherington · Rule change · TB 22-01 (2022-01 Fastrack)

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 on this page: Jon Brakke

2022-02-01 EP Throttle Body and Idle Air

#31800 from David Boles · Rule change · TB 22-02 (2022-02 Fastrack)

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

2022-02-01 EP Porsche 968 Engine Questions

#31831 from Hayes Flynn · Rule change · TB 22-02 (2022-02 Fastrack)

In EP spec line "Porsche 968 (92-95)", add to Notes:
"Dry sump is allowed."

2022-02-01 EP Request weight reduction for 1979-1985 Mazda RX-7

#31833 from RON OLSEN · Rule change · TB 22-02 (2022-02 Fastrack)

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: Jason Albright, Danny Padden, Steve Gaetjens

2022-03-01 EP 1999 3.8L Ford Mustang to EP?

#31635 from Chris Dercole · Rule change · TB 22-03 (2022-03 Fastrack)

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.

2022-03-01 EP EP Adjustments

#31858 from Production Committee · Rule change · TB 22-01 (2022-01 Fastrack)

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.

2022-03-01 EP Improved Touring Tires

#32064 from Greg Amy · Rule change · TB 22-03 (2022-03 Fastrack)

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."

2022-04-01 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."

2022-04-01 EP Request Idle control valve clarification

#32178 from Joe Camilleri · Rule change · TB 22-04 (2022-04 Fastrack)

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."

2022-05-01 EP EP MX-5 Global Cup Car

#32218 from Production Committee · Rule change · TB 22-03 (2022-03 Fastrack)

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: Nathan Nicholson, Chris Haldeman, Cam Ebben, Vaughn Mishko

2022-05-01 EP Please Class BMW 128i in EP

#32370 from Mark Uhlmann · Rule change · TB 22-05 (2022-04 Fastrack)

In EP Spec Lines, classify the BMW 128i (08-13) as follows:

A specification table follows in the original; it is not shown here.

2022-05-01 EP Inconsistency in Body Work Descriptions

#32396 from Production Committee · Rule change · TB 22-05 (2022-04 Fastrack)

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."

2022-06-01 EP Subaru BRZ Model Years

#32500 from Steve Gaetjens · Rule change · TB 22-06 (2022-06 Fastrack)

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)"

2022-09-01 EP Request to classify VW New Beetle 2.5L in EP

#32725 from G. Metcalf · Rule change · TB 22-09 (2022-09 Fastrack)

In EP Spec Lines, classify Volkswagen New Beetle (06-11) as follows:

A specification table follows in the original; it is not shown here.

2022-09-01 EP Request Rotary Injection on Dual Y manifold

#32775 from James Lindenthal · Rule change · TB 22-09 (2022-09 Fastrack)

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."

2022-09-01 EP Request for Corrado Stroke & Displacement Correction

#32985 from Douglas Hedges · Rule change · TB 22-09 (2022-09 Fastrack)

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"

2023-01-01 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: Jason Albright, Danny Padden, Steve Gaetjens

2023-01-01 EP Request alternate carburetors for EP 280z

#33405 from Joe Harlan · Rule change · TB 23-01 (2023-01 Fastrack)

In EP Spec Lines, Nissan 280Z, change Carburetor. No. & Type as follows:
"(2) Hitachi-SU (1bbl) 46mm throttle bores, or fF uel injection."

2023-01-01 EP Fuel Injection 12a Mazda RX3

#33434 from Aaron Downey · Rule change · TB 23-01 (2023-01 Fastrack)

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/

Applies to Mazda RX-7 on this page: Jason Albright, Danny Padden, Steve Gaetjens

2023-01-01 EP Mazda RX3 - Weight Reduction

#33436 from Aaron Downey · Rule change · TB 23-01 (2023-01 Fastrack)

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"

2023-01-01 EP Request TR8 Dry Sump Allowance

#33460 from Jeff Young · Rule change · TB 23-01 (2023-01 Fastrack)

In EP Spec Lines, Triumph TR8 (78-81), add to Notes as follows:
"Dry sump is allowed."

2023-01-01 EP Review Limited Prep Port Matching Rules

#33600 from Production Committee · Rule change · TB 23-01 (2023-01 Fastrack)

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."

2023-01-01 EP 280ZX Classification Request

#33611 from Bill Coffey · Rule change · TB 23-01 (2023-01 Fastrack)

In EP Spec Lines, add a spec line as follows:

A specification table follows in the original; it is not shown here.

2023-04-01 EP Investigate Parity of Z3

#33343 from Tim Schreyer · Rule change · TB 23-01 (2023-01 Fastrack)

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."

2023-06-01 EP 914-6 Valve Size Correction

#34185 from Kip VanSteenburg · Rule change · TB 23-06 (2023-05 Fastrack)

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)"

2023-07-01 EP Correct Intake Valve Size on 1500cc Midget/Spitfire

#34419 from Production Committee · Rule change · TB 23-06 (2023-05 Fastrack)

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)"

2023-09-01 EP Hub Note Clean Up In EP TR8 Spec Line

#34649 from Jeff young · Rule change · TB 23-09 (2023-09 Fastrack)

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."

2023-09-01 EP Triumph GT6 Adjustments

#34662 from ANTHONY PARKER · Rule change · TB 23-09 (2023-09 Fastrack)

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

2023-09-01 EP Triumph GT6 Adjustments: Brakes

#34663 from ANTHONY PARKER · Rule change · TB 23-09 (2023-09 Fastrack)

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

2023-12-01 EP Porsche 944/924S Rule Change Request

#35002 from Adam Achepohl · Rule change · TB 23-12 (2023-12 Fastrack)

In EP Spec Lines, delete the Porsche 944/924S 2.5L (2V) (83-88) spec line entirely, and create a new spec line for Porsche
944/924S 2.5L(2V) 2.7L(2V) (83-89) as follows:

A specification table follows in the original; it is not shown here.

2023-12-01 EP Triumph GT6 Adjustments

#35054 from ANTHONY PARKER · Rule change · TB 23-12 (2023-12 Fastrack)

In EP Spec Lines, Triumph GT6, change weight as follows:
"1830 1800"

Applies to Triumph GT6+ on this page: Anthony Parker

2024-01-01 EP Request to Review Z3 2.5 Spec Line

#35073 from Tim Schreyer · Rule change · TB 24-01 (2024-01 Fastrack)

In EP spec line, BMW Z3 2.5L, change weight as follows:
"2450 2500
*2511 2563
**2573 2625"

Applies to BMW Z3 on this page: Jon Brakke

2024-01-01 EP Miata Alternate Head

#35253 from Don Tucker · Rule change · TB 24-01 (2024-01 Fastrack)

In EP Spec Lines, Mazda MX-5 /Miata 1.8L (90-97), change weight as follows:
"2200 2150"
Mazda MX-5 /Miata (94-97)
"2035 2000
*2086 2050
**2137 2100"

Applies to Mazda MX-5 on this page: Nathan Nicholson, Chris Haldeman, Cam Ebben, Vaughn Mishko

Applies to Mazda Miata on this page: Don Tucker

2024-01-01 EP Triumph GT6 Adjustments

#35255 from Anthony Parker · Rule change · TB 24-01 (2024-01 Fastrack)

In EP spec line, Triumph GT6, make the following change in the Notes section:
"Two (2) 1.75” auto-type carburetors @ 1970 40 lbs. Three (3) Weber 40 DCOE on IR manifold with 28mm chokes @ 1990
lbs. Laycock overdrive, May use 5 speed gearbox w/o overdrive. Three (3) Weber 40mm DCOE w/28mm venturi on individual
runner manifold @ 2020 lb."

Applies to Triumph GT6+ on this page: Anthony Parker

2024-01-01 EP Honda S2000 throttle body

#35272 from Aaron Johnson · Rule change · TB 24-01 (2024-01 Fastrack)

In EP spec line, Honda S2000, make the following changes to its spec line:
Fuel Injected Equipped Throttle Body Inside Diameter: "62 64"
Notes: "Comp. Ratio limited to 12.0:1. Valve lift limited to .500”. An adaptor plate can be used to mount the 62mm throttle body
from '00-05 to the '06-09 intake manifold. The adaptor plate can be no more than 1.25" thick, and its bore must not exceed the
"Fuel Injected Equipped Throttle Body Inside Diameter" maximum spec of 64mm."

2024-01-01 EP Correction within Triumph TR8 Spec Line

#35315 from Production Committee · Rule change · TB 24-01 (2024-01 Fastrack)

In EP spec line, Triumph TR8 (78-81), move the "Dry sump allowed" wording to the appropriate location as follows:
Carburetor. No. & Type: “Zenith Stromberg carbs or fuel injection. Dry sump is allowed.”
Notes: “Comp. Ratio limited to 12.0:1, Valve lift limited to .500”. Dry sump is allowed.”

2024-01-01 EP Correction to EP 924S/944 Spec Line

#35317 from Production Committee · Rule change · TB 24-01 (2024-01 Fastrack)

In EP spec line, Porsche 944/924S 2.5L (2V) / 2.7L (2V) (83-89), change Weight as follows:

A specification table follows in the original; it is not shown here.

2024-02-01 EP Update 1988-1991 Civic to Match 1988-1991 CRX

#35399 from Enrik Benazic · Rule change · TB 24-02 (2024-01 Fastrack)

In HP, make the following weight change:
Honda Civic 1.5 (88-91)
“2245 2175
*2301 2229
**2357 2284”

2024-03-01 EP GCR Correction - Redundant HP Spec Lines

#35623 from Production Committee · Rule change · TB 24-03 (2024-03 Fastrack)

In HP Spec Lines, delete the following redundant spec lines in their entirety:
Spec line #10 - VW Rabbit Cabriolet 1780
Spec line #3 - VW Scirocco 1588
Spec line #4 - VW Scirocco 1780 (8-valve) (83-88)
Spec line #5 - VW Scirocco 1588

2024-06-01 EP NIssan 300ZX Z31 to EP

#35830 from Murphy Nichols · Rule change · TB 24-06 (2024-06 Fastrack)

In EP Spec Lines, classify Nissan 300ZX (84-89), as follows:

A specification table follows in the original; it is not shown here.

2024-06-01 EP RX7 1993 and Up Request In EP Spec Lines, classify

#36031 from Edward Zabinski · Rule change · TB 24-06 (2024-06 Fastrack)

Mazda RX-7 (92-97) as follows:

A specification table follows in the original; it is not shown here.

2024-06-01 EP Clean-up Multiple EP RX-8 Spec Lines In EP

#36156 from Production Committee · Rule change · TB 24-06 (2024-06 Fastrack)

Spec Lines, make the following changes to the two Mazda RX-8 spec lines.
Remove spec line entirely:
Mazda RX-8 (04-11)
Remove the wording "alternate":
Mazda RX-8 (04-11)(alternate)
Spec Mazda (SM/SMX) None.

2024-08-01 EP Errant entry in HP production line item

#36231 from Angus Crome · Rule change · TB 24-08 (2024-08 Fastrack)

In HP Spec Lines, change Track (F/R)mm/(in.) as follows:
Volkswagen Golf (GTI, GT, GL) (85-92): "2 1537/1529 (60.5/60.2)"
Volkswagen Jetta (GLI, GL) (85-92): "2 1537/1529 (60.5/60.2)"

2024-11-01 EP 1275 HP Spridget Level 2 Only

#36518 from Darryl Saylor · Rule change · TB 24-09 (2024-09 Fastrack)

In HP Spec Lines, Austin-Healey Sprite MkI, II, III, IV MG Midget (ALL) - Level 2 - 1275cc, change Notes as follows:
"(Effective 11/1/2024) Compression ratio limited to 11 12.0:1"
In HP Spec Lines, Austin-Healey Sprite MkI, II, III, IV MG Midget (ALL) - Level 2 - 1098cc, change Notes as follows:
"(Effective 11/1/2024) Compression ratio limited to 11 12.0:1"

2024-11-01 EP NA Miata Track Width Correction

#36902 from Production Committee · Rule change · TB 24-11 (2024-11 Fastrack)

In EP Spec Lines, Track (F/R) mm/(in.), change as follows:
Mazda MX-5 /Miata 1.6L (-1993) - "1478/1491 (58.2/58.7) 1516/1534 (59.7/60.4)"
Mazda MX-5 /Miata 1.8L (90-97) - "1483/1509 (58.4/59.4) 1516/1534 (59.7/60.4)"
Mazda MX-5 /Miata (94-97) - "1483/1509 (58.4/59.4) 1516/1534 (59.7/60.4)"

2024-12-01 EP Triumph GT6 Adjustments

#37112 from Anthony Parker · Rule change · TB 24-12 (2024-12 Fastrack)

In EP Spec Lines, make the following changes in the "Triumph GT6" spec line:
Carburetor No. & Type: (2): "1.5” 1.75" Auto-type carburetor(s)"
Notes: "Two (2) 1.75” auto-type carburetors @ 1940 lbs. Three (3) Weber 40 DCOE on IR manifold with 28mm chokes @ 1990
lbs. Laycock overdrive, May use 5 speed gearbox w/o overdrive."

2025-01-01 EP Request to Reduce Weight of BMW 325i/is E30 (84-91) Spec Line

#37119 from Tim Schreyer · Rule change · TB 25-01 (2025-01 Fastrack)

In EP SPEC LINES, BMW 325i/is (E30) (84-91), change Weight as follows:
"2200 2150
*2255 2204
**2310 2258"

2025-02-21 EP Effective date for Jan 2025 GCR updates

#37654 from Doug Piner · Rule change · TB 25-02 (2025-02 Fastrack)

In EP Spec Lines, add to Notes as follows:
BMW Z3 2.5LL "(Effective 2/21/2025) 52mm Flat Plate Intake Restrictor is required."
BMW Z3 2.8L (97-00): "(Effective 2/21/2025) 55mm Flat Plate Intake Restrictor is required."
BMW 328i/is E36 (96-99): "(Effective 2/21/2025) 58mm Flat Plate Intake Restrictor is required."
BMW 328i/ci E46 (01-06): "(Effective 2/21/2025) 58mm Flat Plate Intake Restrictor is required."
BMW 325i/is E46 (01-06): "(Effective 2/21/2025) 56mm Flat Plate Intake Restrictor is required."
BMW 325i/is E-36 (92-95): "(Effective 2/21/2025) 56mm Flat Plate Intake Restrictor is required."
BMW 325is M-Technic (1994): "(Effective 2/21/2025) 56mm Flat Plate Intake Restrictor is required."

2025-03-01 EP Request Competition Adjustment to BMW Z3 2.5L

#37120 from Tim Schreyer · Rule change · TB 25-01 (2025-01 Fastrack)

In EP Spec Lines, change Notes as follows:
BMW Z3 2.5LL "(Effective 3/1/2025) 56mm 52mm Flat Plate Intake Restrictor is required."
BMW Z3 2.8L (97-00): "(Effective 3/1/2025) 59mm 55mm Flat Plate Intake Restrictor is required."
BMW 328i/is E36 (96-99): "(Effective 3/1/2025) 62mm 58mm Flat Plate Intake Restrictor is required."
BMW 328i/ci E46 (01-06): "(Effective 3/1/2025) 62mm 58mm Flat Plate Intake Restrictor is required."
BMW 325i/is E46 (01-06): "(Effective 3/1/2025) 60mm 56mm Flat Plate Intake Restrictor is required."
BMW 325i/is E-36 (92-95): "(Effective 3/1/2025) 60mm 56mm Flat Plate Intake Restrictor is required."
BMW 325is M-Technic (1994): "(Effective 3/1/2025) 60mm 56mm Flat Plate Intake Restrictor is required."

2025-03-01 EP Interpretation of Production Rules on Mirrors

#37235 from Lawrence Slivinski · Rule change · TB 25-03 (2025-03 Fastrack)

In GCR, add new rule as Section 9.1.5.E.10.f:
"Any interior or exterior mirror(s) that meets rule 9.3.36 may be used."

2025-03-01 EP Weight Reduction for Honda S2000

#37466 from Michael Unger · Rule change · TB 25-03 (2025-03 Fastrack)

In EP, Spec Lines make the following weight changes:

A specification table follows in the original; it is not shown here.

2025-03-01 EP Mazda 1999 Miata 1.8L

#37488 from Joe Carr · Rule change · TB 25-03 (2025-03 Fastrack)

In EP Spec Lines, make the following weight change:
Mazda MX-5 /Miata (99-05):
"2150 2100
*2204 2153
**2258 2205"

2025-04-01 EP Request for Classification of Chevrolet Spark

#37755 from Kristian Smith · Rule change · TB 25-04 (2025-04 Fastrack)

In HP Spec Lines, classify the Chevrolet Spark (16-22):

A specification table follows in the original; it is not shown here.

2025-04-01 EP Request to Lower Ford Festiva Minimum Weight to 1600 LBS

#37939 from Doug DeRonne · Rule change · TB 25-04 (2025-04 Fastrack)

In HP Spec Lines "Ford Festiva (88-93)" change as follows:
Weight:
"1700 1600
*1743 1640
**1785 1680"
Notes:
"Compression ratio limited to 10.5 11.0:1. Valve lift limited to .450”."

2025-06-01 EP Base Weight Adjustment for H-Production X1/9 Spec Lines

#38255 from Matthew Brannon · Rule change · TB 25-06 (2025-06 Fastrack)

In HP Spec Lines, change Weight as follows:
Fiat X-1/9 & Bertone1500: “1790 1740 *1835 1784 **1880 1827”
Fiat X-1/9 1300: “1650 1600 *1691 1640 **1733 1680”
Fiat X-1/9 1300: “2060 2010”
Fiat X-1/9 1500: “1950 1900”

2025-07-01 EP BMW Z4 update

#38490 from Bryce McGuire · Rule change · TB 25-07 (2025-07 Fastrack)

In EP Spec Lines, BMW Z4 (03-05), add to Notes the following:
“52mm Flat Plate Intake Restrictor.”

2025-07-01 EP EP Fiat 124 Spider Competition Adjustment Request

#38498 from John Baucom · Rule change · TB 25-07 (2025-07 Fastrack)

In EP Spec Lines, Fiat 124 Sport Spider 1600 & 124 Spider 2000, change as follows:
Weight: "2050 2000"
Carburetor No. & Type: "(2) Weber 40 IDF-40IFI, (2) Solex C40P116, 34 36mm choke(s) req’d, (2) Weber 45DCOE w/ 34 36 mm
choke(s) on I.R. manifold or fuel injection."

2025-10-01 EP HP Plymouth Arrow spec omission

#38995 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)

In HP Spec Lines, Plymouth Arrow (76-80), add the following wording to Trans. Speeds(max):
"4 or 5"

2025-10-01 EP Add Wheel Diameter to Appendix G

#39008 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)

In Appendix G.2.3, change as follows:
"Rim width and diameter are is absolute maximums."

2025-10-01 EP Add TB ID tolerance to general Prod rules

#39009 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)

In GCR, Section 9.1.5.E., change as follows:
9.1.5.E.1.b.4: "The inside dimensions of the throttle body casting/housing (as measured at the throttle butterfly) must remain
stock (tolerance of +/-.25mm), but the throttle body can otherwise be ported and polished."
9.1.5.E.2.b.4: "The inside dimensions of the throttle body casting/housing and all dimensions of the throttle butterfly must
remain stock (tolerance of +/-.25mm)."

2025-11-01 EP Please Lower Weight of 280Z

#38871 from Matthew Miller · Rule change · TB 25-09 (2025-09 Fastrack)

In EP Spec Lines, Nissan 280Z, change Weight (lbs) as follows:
"(Effective 11/1/2025) 2560 2400
*2624 2460
**2688 2520"

2025-11-01 EP Miata Weight Adjustment Follow Up

#38949 from Don Tucker · Rule change · TB 25-10 (2025-10 Fastrack)

In EP Spec Lines, Mazda MX-5 / Miata 1.8L (90-97), Effective 11/1/2025 make the following weight change:
"2150 2125"

2025-11-01 EP Weight Break for 1098 Midget / Sprite

#38970 from Kendall Jones · Rule change · TB 25-10 (2025-10 Fastrack)

In HP Spec Lines, Austin-Healey Sprite/Midget 1098cc, Effective 11/1/2025make the following weight change:
"1630 1550"

2025-11-01 EP HP Volvo 142 spec omission

#38994 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)

In HP Spec Lines, Volvo 142/142E P-1800 Engine, Effective 11/1/2025 add the following wording to Notes:
"Comp. Ratio limited to 12.0:1. Valve lift limited to .425”."

2025-11-01 EP HP Mini DOHC 1.6

#38996 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)

In HP Spec Lines, Mini Cooper (07-13) (includes 09-15 convertible and 12-15 Coupe), Effective 11/1/2025 make the following
changes to the Notes:
"Compression ratio limited to 11.0:1, Valve lift limited to .450”.390"."

2025-11-01 EP Add to Rabbit description

#39019 from Production Committee · Rule change · TB 25-11 (2025-11 Fastrack)

In FP Spec Lines, make the following spec line correction:
"Volkswagen Rabbit (Includes Convertible Cabriolet)"
In HP Spec Lines, make the following spec line correction:
"Volkswagen Rabbit 1588 (Includes Cabriolet)"
"Volkswagen Rabbit 1715 (Includes Cabriolet)"
"Volkswagen Rabbit 1780 (Includes Cabriolet)"

2025-11-01 EP Clean-up 9.1.5.E.7e

#39025 from Production Committee · Rule change · TB 25-11 (2025-11 Fastrack)

In GCR, Section 9.1.5.E.7., change as follows:
"e. Cars fitted with rear drum brakes, can convert to rear disc brakes without penalty. Note that the “Brakes Std.” and “Brakes
Alt.” listings on a vehicle’s spec line do not prohibit a car that was fitted with rear drum brakes stock, from converting to rear
disc brakes under this rule. When converting from rear drum brakes to rear disc brakes:
1. Rear brake rotors must be solid and can be no larger in diameter than the largest permitted front brake rotor, as defined on
the vehicle’s spec line.
2. Rear calipers and mounting brackets are unrestricted but must be made of a ferrous or aluminum material. The standard and
alternate brake listings on a vehicle’s specification line, does not prohibit a car that was fitted with rear drum brakes as stock

2025-11-01 EP Add TB size to Ford Mustang (94-98) Spec Line

#39130 from Production Committee · Rule change · TB 25-11 (2025-11 Fastrack)

In EP Spec Lines, Ford Mustang (94-98) add the following to the Fuel Injected Equipped Throttle Body Inside Diameter column:
"60"

2025-12-01 EP TR2 Notes E&O

#39180 from Anthony Parker · Rule change · TB 25-12 (2025-12 Fastrack)

In EP Spec Lines, Triumph TR2, 3, 3A, 4, 4A, TR4, TR4A, IRS, make the following change to the Notes:
"Front apron assembly may be made of alternate material. Three (3) Weber 40 DCOE on IR manifold with 28mm chokes @ 1990
lbs. Laycock overdrive, may use 5 speed gearbox without overdrive."

2025-12-01 EP Balance of Power

#39187 from Jim Simaras · Rule change · TB 25-12 (2025-12 Fastrack)

In EP Spec Lines, make the following changes to Restrictors:
BMW Z3 2.5L: "52mm 50mm Flat Plate Intake Restrictor"
BMW Z3 2.8L (97-00): "55mm 53mm Flat Plate Intake Restrictor"
BMW 328i/is E36 (96-99): "58mm 55mm Flat Plate Intake Restrictor"
BMW 328i/ci E46 (01-06): "58mm 55mm Flat Plate Intake Restrictor"
BMW 325i/is (E46) (01-06): "56mm 53mm Flat Plate Intake Restrictor"
BMW 325is M-Technic (1994): "56mm 53mm Flat Plate Intake Restrictor"
BMW 325i/is E-36 (92-95): "56mm 53mm Flat Plate Intake Restrictor"

2026-01-01 EP Request to Update E30 BMW Throttle Body Diameter Verbiage

#39363 from Tim Schreyer · Rule change · TB 26-01 (2026-01 Fastrack)

In EP Spec Line BMW 325i/is E30 (84-91), change Drivetrain Notes as follows:
"Fuel Injection, TB: 60mm"

2026-05-01 EP Miata track width - errors and omissions

#39976 from Production Committee · Rule change · TB 26-05 (2026-05 Fastrack)

In EP Spec Lines, Mazda MX-5 / Miata (94-97), change Track (F/R) mm/(in.) as follows:
Track (F/R) mm/(in.): "1483/1509 (58.4/59.4) 1516/1534(59.7/60.4)"

Applies to Mazda MX-5 on this page: Nathan Nicholson, Chris Haldeman, Cam Ebben, Vaughn Mishko

Applies to Mazda Miata on this page: Don Tucker

2026-05-01 EP Triumph GT6 Spec Change.

#40098 from Anthony Parker · Rule change · TB 26-05 (2026-05 Fastrack)

In EP Spec Lines, Triumph GT6, change the "Drivetrain Notes" as follows:
"(2) auto-type w/44 45mm choke(s)"

Applies to Triumph GT6+ on this page: Anthony Parker