The following is a reproduction of the official FIA regulations, a copy of which can be found here
(Note: Appendix X of Appendix K on page 166 specifically refers to eligible cars under the title “Thoroughbred Grand Prix Cars”)
The General Prescriptions applicable to all FIA Championships must be observed unless otherwise stated hereafter, as must the prescriptions of Appendix K to the International Sporting Code.
1. General Provisions
An Thoroughbred Grand Prix Car is a single seat, Formula One racing car of period classification ‘GR’, ‘HR’, or ‘IR’.
(‘GR’ – Single seat racing cars of the period from 1/1/1966 to 31/12/1971)
(‘HR’ – Single seat racing cars of the period from 1/1/1972 to 31/12/1976)
(‘IR’ – Single seat racing cars of the period from 1/1/1977 to 31/12/1982 and 3-litre F1 between 1/1/1977 to 31/12/1985)
Cars must conform to FIA Formula One regulations, which were in effect during the year of manufacture of the car, or its participation in international competition. The car must have been entered and successfully scrutineered at an International Formula One event, between 1/1/1966 and 31/12/1985, and for which period evidence exists.
Prototype Formula One cars manufactured in the period (1/1/1966 to 31/12/1985) by a Grand Prix Team and conforming to the FIA Formula One regulations in effect during the year of manufacture, may also be accepted, providing evidence can be produced to show it was used by the Grand Prix team as a test or development car in period and verify its origin, original specification and history.
Cars built for or used only in Formula 3000 events are not eligible. Cars with 1500cc turbo charged, 3500cc normally aspirated or gas turbine engines are acceptable for parades and demonstrations only. Thoroughbred Grand Prix Cars must comply with the relevant sections of the Appendix K Regulations.
Where the construction of the vehicle makes it practical to do so, all drivers must wear an FIA Approved Head Restraint (HANS type device).
2. Chassis
The chassis must conform to the design and construction of the original. Additional material may be added to repair composite chassis but professional inspection techniques must be employed for any such chassis and certification of such inspections must be affixed to the FIA Historic Technical Passport. No other alteration may be made to the chassis, and all safety requirements for the period of the car’s participation in International Competition Series (hereafter “International Life”) must be present.
3. Front and Rear Suspension
The suspension must conform to the manufacturer’s specification or a system for which period evidence exists. Springs must be single and of constant rate unless period evidence is produced to show the use of variable rate or double springs. Gas filled or remote reservoir shock absorbers are prohibited on all vehicles competing in this Championship. Cars originally fitted with active suspension systems may be converted back to non-active system used in period on that model.
4. Engine
The engine fitted must be of the same make and model and type fitted conforming to a manufacturer’s specification or for which period evidence exists. The engine categories are as follows:
i) Normally aspirated engines not exceeding 3000cc
ii) Turbo-charged engines not exceeding 1500cc (FOR PARADES AND DEMONSTRATIONS ONLY)
iii) Normally aspirated engines not exceeding 3500cc (FOR PARADES AND DEMONSTRATIONS ONLY)
iv) Gas turbines engines (FOR PARADES AND DEMONSTRATIONS ONLY)
Engines which were less than the upper capacity limit in period may not be enlarged beyond the swept volume employed in the car’s international life.
In order to participate in races a Thoroughbred Grand Prix Car may only be powered by a normally aspirated engine, not exceeding 3000cc. Engines must be of a type identical to that originally fitted to the car during its participation in international competition and for which period evidence exists (for example, Cosworth DFV, Ferrari flat and V12, Alfa Romeo V8, BRM V12, etc., ). Cars originally fitted with Cosworth DFV (longstroke) may use Cosworth DFV ss (shortstroke) however only cars that were originally fitted with the Cosworth DFY, and for which period evidence exists, may use a Cosworth DFY engine.
The FIA Historic Technical Passport for the cars in ii), iii) and iv) above must be endorsed on the front page “FOR PARADES AND DEMONSTRATIONS ONLY”.
(NB: The use of titanium for any engine components except valve caps is prohibited unless there is period evidence to support its use)
5. Ignition
The ignition system must be of a type used during the cars International life. An electronic rev-limiting device may be fitted to any car. The use of electronic engine management systems on DFV/DFY engines is prohibited.
6. Instrumentation
Electronic instrumentation may be fitted but any data acquisition of that instrumentation, must be limited to the following functions, engine RPM, engine oil pressure, engine oil temperature, engine water temperature and fuel pressure. Wheel speed sensors may be used during private testing only and must be removed from the car for the duration of the TGP Event including untimed free practice.
7. Lubrication
The position of oil coolers may be changed but must not alter the silhouette of the car. A catch tank of 3000cc capacity must be fitted.
8. Fuel system
Fuel tanks must comply with the safety standards specified in Article 253.14 of Appendix J. Whenever a competitor uses a safety fuel tank, it must come from a manufacturer approved by the FIA. In order to obtain agreement from the FIA, a manufacturer must provide proof of the quality and consistency of its products and their compliance with the FIA approved specifications. Safety tank manufacturers recognised by the FiA must undertake to deliver to their customers tanks complying with the norms approved. To this end, each tank delivered shall be marked with the name of the manufacturer, the date of manufacture and the series number. The FIA reserves the right to approve any other set of technical specifications after studying the dossier submitted by the manufacturer concerned. (Technical specifications of FT3-1999, FT3.5 or FT5 tanks are available on request from the FIA Secretariat.)
All cars of period GR, HR and IR using a standard tank or tanks must fill them with safety foam in conformity with American Military Specification MIL-B-83054. Cars may use reduced capacity fuel tanks providing the tank is manufactured by an FIA Approved manufacturer and the design and methodology of the tank is approved by the manufacturer. Reduced capacity tanks must fit into the volume which housed the original tank and any void around the tank must be completely filled with foam to the above specification.
After approximately five years, the ageing of safety tanks can result in a considerable reduction in the strength characteristics of the material. No bladder shall be used for more than five years after the date of manufacture unless it is inspected and re-certified by the manufacturer for a period of up to two additional years.
On no account should a bladder be used for more than seven years after its’ date of manufacture.
9. Gear Box
Cars originally fitted with semi-automatic transmissions may be converted to a manual gearbox. Gearboxes must be of the same type and specification as those used during the vehicle’s competition history.
10. Final Drive
The final drive including the differential must conform to the manufacturer’s specification for that type of car and be of a type for which period evidence exists.
11. Brakes
Only cars which are used for parades and demonstrations may use carbon-carbon brakes. Cars originally fitted with carbon-carbon brakes may be converted to steel discs with contemporary calipers and conventional pads.
12. Wheels
Wheels must be of the original diameter used during the car’s International life. Rim widths must not be increased but may be decreased in order to accommodate available tyres. Wheels must comply with the condition testing regulations in Appendix K 2004.
13. Tyres
The nominated control tyre for Thoroughbred Grand Prix Cars is the Avon A11 compound cross ply tyre and only these may be used. For wet weather use only Avon race tyres of standard wet weather pattern may be used. Not more than one set of slick tyres (4/6 tyres) may be introduced to the Championship at each event. Category G cars may use Dunlop treaded tyres using CR65 tread pattern.
The use of any tyre warming device, or the application of any artificial compound which may affect the hysterisis of the tyre tread, is strictly forbidden.
14. Body
The car’s bodywork must be of a design used on that car during its active International life. The bodywork must display livery used on the car during its active International life( subject only to the laws of the country in which the event is to be held). Fire extinguisher systems of a type used during the cars International life must be fitted and be operable. Fire extinguisher systems may be supplemented to the standards of Appendix J, Art. 274.14.1.
15. Aerodynamic Aids
Aerodynamic devices may only be fitted to the car if the car used such devices during its International life. The devices used must conform in design, positioning and dimensions to those used during the car’s International life.
No Aerodynamic device which was fitted to unsprung parts of the car and/or was adjustable from the cockpit is permitted.
Cars which originally ran with aerodynamic devices may be run without.
Cars that originally ran fixed aerodynamic skirts in period (during 1981 and 1982) may retain the original skirt fixing and design philosophy. However, the skirt must be modified to maintain the mandatory 40mm minimum static ground clearance. Rubbing strips are not permitted.
Any car showing signs consistent with continuous contact with the ground will, at the discretion of the FIA Technical Delegate, be reported to the Stewards of the Meeting.
Any device fitted to the car to lower its ground clearance whilst in motion must be disabled.
16. Lighting
All cars must have a red light in working order throughout the event which is of a model approved by the FIA (see Technical List no. 19), faces rearwards at 90 degrees to the car’s centre line, is clearly visible from the rear, is not mounted more than 100mm from the car’s centre line, is at a height of no less than 350mm, is no less than 450mm behind the rear wheel centre line and can be switched on by the driver when seated normally in the car. Where LED lights are used, at least 90% of the elements must be operational.
17. Dimensions, wheelbase, track and weight
The wheelbase must not vary by more than 1.1% (maximum 1”/25.4mm) from a dimension for which period evidence exists. The track must not be superior to a dimension for which period evidence exists.
The weight of the car, when weighed without fuel, but with oil shall not be less than the minimum weight specified for the car in the Technical Regulations for the FIA Formula One World Championship for the year in which the car originally competed as shown in Section 18.
When a car has been selected for weighing, nothing, other than fuel, can be removed from the car and no liquid, solid or gaseous substance may be added.
At all times during the event the static height of all suspended parts of the car must be no less than 40mm.
18. Table of Dimensions
Please click the link below to the Official FIA Regulations for details of dimensions.
View the Official FIA regulations here
(Note: Appendix X of Appendix K on page 166 specifically refers to eligible cars under the title “Thoroughbred Grand Prix Cars”)
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