HP at Mid-Ohio Sports Car Course

2019-03-01 HP Do Something About the Toyota Yaris In H Production

#25834 from Ron Bartell · Rule change · TB 19-03 (2019-03 Fastrack)

In HP, Toyota Yaris (06-11), Toyota Yaris Sedan (07-12), Toyota Yaris (12-18), add weight to
the spec line as follows:
“1970 2100
*2019 2153
**2069 2205”

2019-03-01 HP Request to Allow 2011+ Fiesta to Change Bolt Pattern on Wheels

#25929 from david mead · Rule change · TB 19-03 (2019-03 Fastrack)

In HP, Ford Fiesta (11-15), add to the notes and correct the years in the spec line as follows:
“Mazda front hub D651-33-06 and rear hub D651-26-15XE allowed.”
“(11-15 16)” first page of the spec line
“(12-13 11-16)” second page of the spec line

2019-04-01 HP 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 HP 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:

2019-08-01 HP 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 HP 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 HP 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 HP 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 HP 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 HP 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 HP Request to Correct Track of 1988-91 Honda Civic

#27487 from Blake Meredith · Rule change · TB 19-12 (2019-12 Fastrack)

In FP, correct track specifications as follows:
Honda Civic 1.5 (88-91) (Level 1)
"59.8 61.3 / 60.0 61.7"
Honda Civic EX (90-91) (Level 2)
"61.4 61.3 / 61.7"
Honda Civic Si (88-91) (Level 2)
"61.3 / 61.7"
Honda Civic Si (88-91) (Level 1)

2019-12-01 HP 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 HP Update years for the Mazda2, Honda Fit, & Mini

#27782 from SCCA Staff · Rule change · TB 20-01 (2020-01 Fastrack)

In HP, Mazda2 (07-11), make change as follows:
(07-11) (11-14)"
In HP, Honda Fit (2015), make change as follows:
(2015) (15-19)"
In HP, Mini Cooper (07-11), make change as follows:
(07-11) (07-13)"

2020-01-01 HP Allow Dry Sump, Limited Prep Porsche 914

#27814 from Greg Amy · Rule change · TB 20-01 (2020-01 Fastrack)

In HP, Porsche 914-4 (1.8L), add to notes as follows:
"A 2-stage dry sump is allowed, but it must be cam-driven only and mounted in the same location as the
OEM oil pump."

2020-01-01 HP Please Allow Alternate Rear Axle Housing for RWD Toyota Corolla

#27854 from Mike Ogren · Rule change · TB 20-01 (2020-01 Fastrack)

In HP, Toyota Corolla (71-74), add to notes as follows:
"Rear axle housing from the 84-87 Corolla is permitted."

2020-01-01 HP 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"

2020-01-01 HP HP VW Rabbit Convertible 1.6L #1922 and 32mm chokes

#27917 from Jack Banha · Rule change · TB 20-01 (2020-01 Fastrack)

In HP, Volkswagen Rabbit 1588 (includes Cabriolet / convertible), change weight as follows:
"1785 * 1830 ** 1874 1735 * 1778 ** 1822"
In HP, Volkswagen Scirocco 1588, change weight as follows:
"1785 * 1830 ** 1874 1735 * 1778 ** 1822"

2020-02-01 HP 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 HP Letter #27917

#28085 from Jack Banha · Rule change · TB 20-03 (2020-03 Fastrack)

In HP, Volkswagen Rabbit 1588 (includes Cabriolet /convertible), spec lines, change Carburetor. No &
Type as follows:
"(1) 40 DCN, DCNF w/ 32mm choke(s), or fuel injection. 32mm choke(s) req'd. (2) auto type side draft(s)
w/ 32mm chokes at 90lbs penalty."
In HP, Volkswagen Rabbit 1588 (includes Cabriolet /convertible), spec lines change Notes, as follows:
"Compression ratio limited to 11.5:1, Valve lift limited to .450”. (2) auto type side draft carburetors with
32mm chokes permitted at weights of 1875/* 1922/** 1969. Mk2 VW front spindles, hubs and bearings
are permitted."

2020-03-01 HP Request to Classify 2007 - 2013 Mini Cooper Convertible

#28111 from G. Brian Metcalf · Rule change · TB 20-03 (2020-03 Fastrack)

In HP, Mini Cooper (02-06), changes as follows:
"(includes convertible)"
In HP, Mini Cooper (07-13), changes as follows:
"(includes convertible)"
In HP, Mini Cooper (05-08), delete the spec as follows:
"Mini Cooper Convertible (05-08)"

2020-03-01 HP Allow HP Datsun 510 Under Level 2 to Utilize Datsun Z Brakes

#28121 from James Bell · Rule change · TB 20-03 (2020-03 Fastrack)

In HP, Nissan/Datsun PL510, make changes to the spec line as follows:
Brakes:
"Factory Spec @ all 4 wheels. (F) 9.1 Disc (R) 9.0 Drum"
Brakes Alt:
"Nissan/Datsun 240Z/260Z/280Z front rotors and calipers and rear aluminum drums are permitted."
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

2020-03-01 HP 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 HP Request Ford Fiesta Weight Adjustment

#28337 from Brian Frank · Rule change · TB 20-03 (2020-03 Fastrack)

In HP, Ford Fiesta (78-80), changes weight as follows:
"1775 1725
* 1819 1768
** 1864 1811"

2020-04-01 HP 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 HP 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 HP 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 HP 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 HP 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.

2020-07-01 HP Request Dual Carbs for 1.8 VW GTI Mk1

#28922 from Tim Linerud · Rule change · TB 20-07 (2020-08 Fastrack)

Thank you for your letter, but this request is not recommended at this time. The vehicle in question is
proven to be competitive as classed, it never came from the factory with a carburetor, and the stock fuel
injection components are not difficult or expensive to obtain, so there is no justifiable reason to add this
allowance to this vehicle's spec line.

2020-08-01 HP 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 HP 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 HP 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 HP 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 HP 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 HP 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 HP 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 HP Request to Classify 2012-2015 MINI Cooper Coupe in HP

#30167 from G. Brian Metcalf · Rule change · TB 21-04 (2021-04 Fastrack)

In HP Spec Lines, Mini Cooper (07-13) (includes 09-15 convertible), change as follows:
"Mini Cooper (07-13) (includes 09-15 convertible and 12-15 Coupe)"

Applies to Mini Cooper on this page: Robert Bax, Frank Schwartz, David Oliveira

2021-04-01 HP Request clarification on VW 1.8 Rabbit GTI Spec Line

#30368 from Andrew Benagh · Rule change · TB 21-04 (2021-04 Fastrack)

In HP Spec Lines, Volkswagen Rabbit GTI 1780 (83-84), add to Notes as follows:
"Mk2 VW front spindles, hubs and bearings are permitted."

Applies to Volkswagen Gti on this page: Scott Hileman

Applies to Volkswagen Rabbit on this page: Vincent LaManna

2021-05-01 HP Volvo 142 spec line complete.

#29479 from Mike Ogren · Rule change · TB 21-05 (2021-05 Fastrack)

In HP Spec Lines, delete the existing Volvo 142/142E P-1800 Engine spec line entirely, and classify Volvo 142/142E:

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

2021-05-01 HP Request to Classify 93-98 Volkswagen Golf to HP

#29790 from David Boles · Rule change · TB 21-05 (2021-05 Fastrack)

In HP Spec Lines, classify Volkswagen Golf III / Jetta III (93-98):

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

2021-05-01 HP Appeal of Request to Move Porsche 924 to HP

#30132 from Hayes Lewis · Rule change · TB 21-05 (2021-05 Fastrack)

In HP Spec Lines, classify Porsche 924 (76-84):

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

2021-05-01 HP 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 HP 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)"

2021-06-01 HP 924 Brakes- and Thank You.

#30614 from Hayes Lewis · Rule change · TB 21-06 (2021-06 Fastrack)

In HP Spec Line Porsche 924 (76-84), change Brakes Std. as follows:
"Solid Vented Disc"

2021-06-01 HP 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"

2021-06-01 HP Correct Induction Error on new HP Mazda 626 Spec Line

#30702 from Production Committee · Rule change · TB 21-06 (2021-06 Fastrack)

In HP Spec Line, Mazda 626 (84-87), change Carb. No. & Type as follows:
"(2) Auto-type sidedraft w/32mm choke(s) on I.R. manifold, of Carburation or fuel injection."

2021-07-01 HP 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."

2021-07-01 HP Request to classify ITC Plymouth Arrow

#30588 from Steve Steeb · Rule change · TB 21-07 (2021-07 Fastrack)

In HP Spec Lines, classify Plymouth Arrow, as follows:

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

2021-07-01 HP Reclassification of the 1984/85 BMW 318i from FP to HP

#30661 from David Vestrand · Rule change · TB 21-07 (2021-07 Fastrack)

In HP Spec Lines, classify BMW 318i/is E30 (84-85), as follows:

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

2021-07-01 HP 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 HP 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 HP 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 HP 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 HP 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 HP 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 HP 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 HP 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 HP Weight Adjustment To Fiat X1/9 Spec Lines, H-Production

#31653 from Matthew Brannon · Rule change · TB 22-01 (2022-01 Fastrack)

In HP Spec Lines, make the following changes to Weight:
Fiat X-1/9 & Bertone 1500 (Level 2): "1840 1790 *1886 1835 **1932 1880"
Fiat X-1/9 1300 (Level 2): "1695 1650 *1737 1691 **1780 1733"
Fiat X-1/9 1300 (Level 1): "2115 2060"
Fiat X-1/9 1500 (Level 1/2): "2000 1950"

2022-01-01 HP 1500 Midget

#31665 from Jerry Oleson · Rule change · TB 22-01 (2022-01 Fastrack)

In HP, classify Austin-Healey Sprite Mk I, II, III, IV MG Midget (ALL) as follows:

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

2022-01-01 HP 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)."

2022-01-01 HP Request weight requirement for 1500 MG Midget

#31802 from Louis Rainer · Rule change · TB 22-01 (2022-01 Fastrack)

In HP, classify Austin-Healey Sprite Mk I, II, III, IV MG Midget (ALL) as follows:

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

2022-02-01 HP 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 HP Incorrect Valve Size Changes in Jan 2022 GCR for FIAT X1/9

#31990 from Matthew Brannon · Rule change · TB 22-02 (2022-02 Fastrack)

In HP Spec Lines, change Valve Specs as follows:
Fiat X-1/9 & Bertone 1500 - Level 2:
"(I) 35.5/(1.40) 36.3/(1.43)
(E) 33.0/(1.30) 33.3/(1.31)"
Fiat X-1/9 1300 - Level 2:
"(I) 35.5/(1.40) 36.3/(1.43)
(E) 31.2/(1.23)"
Fiat X-1/9 1300 - Level 1:

2022-03-01 HP Weight Change for Competition Adjustment

#31182 from Jason Stine · Rule change · TB 22-01 (2022-01 Fastrack)

Effective 3/1/2022 In HP Spec Lines, Triumph Spitfire 1500, make changes to Weight as follows:
"1560 1605
*1599 1645
**1638 1685"

2022-03-01 HP 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 HP 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 HP 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 HP 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 HP 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."

2022-04-01 HP Classify VW New Beetle in HP.

#32241 from Brian Metcalf · Rule change · TB 22-04 (2022-04 Fastrack)

In HP Spec Lines, classify Volkswagen New Beetle (98-05) as follows:

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

2022-05-01 HP 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."

2022-05-01 HP 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 HP 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 HP 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 HP 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 HP 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 HP 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 HP MGB HP Weight Break and/or Hybrid 1/2 Prep in HP

#33127 from Neil Verity · Rule change · TB 23-01 (2023-01 Fastrack)

In HP Spec Lines, MGB & MGB-GT, change Weight as follows:
"2050 2000
*2101 2050
**2153 2100"
In HP Spec Lines, create new spec line as follows:

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

2023-01-01 HP Datsun 510 Help

#33568 from Brian Downey · Rule change · TB 23-01 (2023-01 Fastrack)

In HP Spec Line, Nissan/Datsun PL510, change Weight changes:
"1960 1910
* 2009 1958
** 2058 2006"

2023-01-01 HP 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."

2023-06-01 HP Request to Classify Sonic and Fiesta in HP

#34264 from Greg Amy · Rule change · TB 23-06 (2023-05 Fastrack)

In HP, adjust model years of the "Ford Fiesta (11-16)" spec line as follows:
"Ford Fiesta (11-16 9)"
In FP, adjust model years of the "Chevrolet Sonic (12-16)" spec line as follows:
"Chevrolet Sonic (12-16 9)"

2023-07-01 HP ITC to FP?

#34286 from David Snow · Rule change · TB 23-06 (2023-07 Fastrack)

In HP Spec Lines, Volkswagen Rabbit Cabriolet 1780, delete in its entirely:
In HP, Spec Lines, Volkswagen Rabbit, change Title as follows:
“Volkswagen Rabbit 1588 (includes Cabriolet / convertible)”
“Volkswagen Rabbit 1715 (81-84) (excl. conv.)”
“Volkswagen Rabbit GTI 1780 (83-84)”

Applies to Volkswagen Rabbit on this page: Vincent LaManna

2023-07-01 HP 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 HP Larger chokes

#34681 from Brian Downey · Rule change · TB 23-09 (2023-09 Fastrack)

In HP Spec Line, Nissan/Datsun PL510, change Carburetor. No. & Type as follows:
"(1) 40 DCN, DCNF w/ 32 4mm choke(s), . or (1) 36mm DCNVH. (2) auto type side draft(s) w/ 32 4mm choke(s) on I.R. manifold @
90lbs penalty."

2023-12-01 HP 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 HP FP and HP Toyota Corolla

#35030 from Keith Church · Rule change · TB 23-12 (2023-12 Fastrack)

In FP Spec Lines, Toyota Corolla 2TC (71-74), change weight as follows:
"1853 1810"
In HP Spec Lines, Toyota Corolla (71-74), change weight as follows:
“1960 1910
* 2009 1958
** 2058 2006”

2023-12-01 HP Weight Reduction for Mazda 626

#35031 from David Reiter · Rule change · TB 23-12 (2023-12 Fastrack)

In HP Spec Lines, Mazda 626 (84-87), change weight as follows:
"2300 2200
*2358 2255
**2415 2310"

2023-12-01 HP 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"

2023-12-01 HP Request to Adjust Weight of 1988-1991 CRX/Civic

#35115 from Enrik Benazic · Rule change · TB 23-12 (2023-09 Fastrack)

In HP Spec Lines, Honda CRX 1.5 (88-91), change weight as follows:
"2245 2175
*2301 2229
**2357 2284"

2024-01-01 HP 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"

2024-01-01 HP Parity in HP

#35138 from Kendall Jones · Rule change · TB 24-01 (2024-01 Fastrack)

In HP Spec Line, Austin-Healey Sprite Mk I, II, III, IV / MG Midget Mk I, II, III, IV & 1500, Prep Level 1/2, change Notes section as
follows:
"Compression ratio limited to 11 12.0:1"

2024-01-01 HP Spitfire classification

#35224 from Michael Walz · Rule change · TB 24-01 (2024-01 Fastrack)

In HP spec line, Triumph Spitfire 1500, make the following change to the Valves column:
"(I) 36.65.5/(1.440)"

2024-01-01 HP 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"

2024-01-01 HP 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."

2024-01-01 HP 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 HP Front Header/Nose Panel Alternate Material For 84-87 CRX

#35301 from Darryl Saylor · Rule change · TB 24-01 (2024-01 Fastrack)

In HP Spec Lines, Honda CRX/Si (84-87), in Notes, make the following change:
"Compression ratio limited to 11.0:1, Valve lift limited to .390”. The front header/nose body panel can be replaced by a
replica which may be constructed of an alternate material provided its appearance remains stock."

2024-01-01 HP 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 HP 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.

2024-01-01 HP Review Classification of HP Mazda 2

#35318 from Production Committee · Rule change · TB 24-01 (2024-01 Fastrack)

In HP spec line, Mazda 2 (11-14), make the following weight changes:
"1920 1995
*1968 2045
**2016 2095"

Applies to Mazda 2 on this page: Jesse Prather

2024-02-01 HP 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 HP 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

2024-05-01 HP Replace plastic panels

#35875 from Darryl Saylor · Rule change · TB 24-05 (2024-05 Fastrack)

In HP spec line "Honda CRX/Si (84-87)", make the following change to the Notes section:
"The plastic OE front header/nose body panel, lower rocker side-skirt, and lower door cap panel can be replaced by a
replica, which may be constructed of an alternate material, provided its appearance remains stock."

2024-06-01 HP 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 HP 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 HP 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 HP 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 HP 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 HP Request for Classification of 1989-1994 Suzuki Swift GT 16V Twin

#36858 from Jorge Fabian · Rule change · TB 24-11 (2024-11 Fastrack)

In HP Spec Lines, Classify Suzuki Swift GT (89-94) as follows:

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

2024-12-01 HP MINI Cooper Spec Line Correction - Rear Brake Rotor Diameter

#37176 from Robert Bax · Rule change · TB 24-12 (2024-12 Fastrack)

In HP Spec Lines, Mini Cooper (02-06), change Brakes Std.mm/(in.) as follows:
"(F) 276/(10.9) Vented Disc (R) 239/(9.4) 259/(10.2) Solid Disc"

Applies to Mini Cooper on this page: Robert Bax, Frank Schwartz, David Oliveira

2025-01-01 HP 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"

2025-01-01 HP Request to Update 1988-1991 Civic to Match 1988-1991 CRX

#37444 from ENRIK BENAZIC · Rule change · TB 25-01 (2025-01 Fastrack)

In HP SPEC LINES, Honda Civic 1.5 (88-91), change Weight as follows:
"2245 2175
*2301 2229
**2357 2284"

2025-02-21 HP 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 HP 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 HP 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 HP HP Class Adjustments

#37459 from Production Committee · Rule change · TB 25-01 (2025-01 Fastrack)

In HP SPEC LINES, change Weight as follows:
Mazda 2 (11-14)
"(Effective 3/1/2025) 1995 2045
*2045 2096
**2095 2147"
Volkswagen Golf (GTI, GT, GL) (85-92)
"(Effective 3/1/2025) 2100 2150
*2153 2204

2025-03-01 HP 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 HP 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"

2025-03-01 HP MINI Cooper (07-13) Spec Line Correction: Errors and Omissions

#37560 from Robert Bax · Rule change · TB 25-03 (2025-03 Fastrack)

In HP Spec Lines, Mini Cooper (07-13) (includes 09-15 convertible and 12-15 Coupe), change as follows:
Engine Type:
"4 Cyl
SOHC DOHC"
Notes:
"Compression ratio limited to 11.0:1, Valve lift limited to .450”.390"."

Applies to Mini Cooper on this page: Robert Bax, Frank Schwartz, David Oliveira

2025-04-01 HP 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 HP 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 HP 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 HP 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 HP 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 HP 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 HP 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 HP 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 HP 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 HP 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 HP 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 HP 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 HP 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 HP 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 HP 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 HP 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 HP Request to Re-Classsify Datsun SPL-311 to HP from FP

#39116 from Robert Heatwole · Rule change · TB 25-12 (2025-12 Fastrack)

In HP Spec Lines, classify Nissan/Datsun SPL 311 as follows:

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

2025-12-01 HP 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 HP 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"

2025-12-01 HP Alternative BOP Request for 84-87 Honda CRX/Civic

#39223 from Bill Lamkin · Rule change · TB 25-12 (2025-12 Fastrack)

In HP Spec Lines, change Wheels as follows:
Honda Civic: "13 x 6 7"
Honda Civic DX (92-95): "13 x 6 7"
Honda Civic/Si (84-87): "13 x 6 7"
Honda Civic 1.5 (88-91): "13 x 6 7"
Honda CRX/Si (84-87): "13 x 6 7"
Honda CRX 1.5(88-91): "13 x 67"

2026-01-01 HP E/O: Improve Consistency of the Spec Lines

#39500 from Robert Bax · Rule change · TB 26-01 (2026-01 Fastrack)

In HP Spec Line, Toyota MR-2 1.6L (85-89), change Comp. Ratio as follows:
"11.0:1"

2026-01-01 HP Request to Reclassify BMW 2002 Into H Production

#39567 from Jonathan Kinberg · Rule change · TB 26-01 (2026-01 Fastrack)

In HP Spec Lines, classify BMW 2002, as follows:

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

2026-02-01 HP Triumph Spitfire 1296cc Compression Ratio Increase to 12:1

#39589 from Neil Verity · Rule change · TB 26-02 (2026-02 Fastrack)

In HP Spec Lines, make the following spec line changes:
Triumph Spitfire:
Carburetion
"Valves: (I) 33.0/(1.30) (E) 29.7/(1.17)
Comp. ratio 11.0 12.0:1, Valve lift .450”
Trans. Speeds: 4"
Triumph Spitfire Mk. III & IV 1500:
Carburetion

2026-03-01 HP Clarification On Oil Cooler Ducting

#39604 from Chuck Allard · Rule change · TB 26-03 (2026-03 Fastrack)

In GCR, Section 9.1.5.E.6.g.4, add the following:
"On mid and rear engine cars, a single inlet hole may be cut in the front bodywork and a single outlet hole may be cut in the front
trunk floor or a wheel well, for the sole purpose of ducting air to a single engine oil cooler. The size of these holes may be no
larger than the area of the oil cooler itself."

2026-03-01 HP Honda Fit 2015-19 Error in Engine Classification

#39853 from Jose Fabian · Rule change · TB 26-03 (2026-03 Fastrack)

In HP Spec Lines, Honda Fit (15-19), change Engine Type Mat’l Block/Head as follows:
"4 Cyl. SOHC DOHC"

2026-05-01 HP 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)"

2026-05-01 HP 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)"

2026-05-01 HP Request to Classify BMW E21 320i

#40110 from Doug DeRonne · Rule change · TB 26-05 (2026-05 Fastrack)

In HP Spec Lines, classify BMW 320i/is (E21) (80-83) as follows:

2026-05-01 HP BMW 318is 84-85 engine displacement correction

#40116 from Production Committee · Rule change · TB 26-05 (2026-05 Fastrack)

In HP Spec Lines, BMW 318i/is E30 (84-85), change Displacement Bore x Stroke mm/ (in.) as follows:
"1797 1767 89.0 x 71.0 (3.50x2.80)"