9.4.5. ROLL CAGES FOR FORMULA CARS AND SPORTS RACING CARS
All Formula and Sports Racing automobiles are required to have
full roll cages. Cage may be of two designs, low front hoop (top of
steering wheel) or high front hoop (equal to rear hoop) but with no
2 seat Sports Racing cars shall have full cockpit width cages.
frame automobiles shall have both front and rear hoops formed of
tubing per 9.4.5.E.4. On automobiles of full monocoque construction, a
fabricated sheet metal front hoop structure may be approved upon specific application to the SCCA.
Closed cockpit Sports Racing car cages
may be constructed in accordance with 9.4 ROLL CAGES FOR GT AND
PRODUCTION BASED CARS.
All Formula car and Sports Racing car roll cage tubing specifications must meet the current GCR specifications,
A. Main Hoop
The main hoop shall be constructed of tubing per 9.4.5.E.4. The minimum bend radius shall not be less than 3 times the tube
diameter measured from the tube centerline.
The main hoop shall not be less than 2 inches above the driver's helmet, seated normally and restrained by seat belt/shoulder harness. A straight line drawn from the
top of the main hoop to the top of the front hoop shall pass over the
driver's helmet. On Formula cars and single seat Sports Racing cars the
vertical members of the main hoop shall not be less than 15 inches apart
(inside dimension) at their attachment to the chassis. If the hoop does
not go to the belly pan, proper gussets and tube triangulation shall be
used under its attachment.
On monocoque chassis the main hoop shall
be welded to mounting plates not less than .080” thick. It is
important that these plates be attached to the chassis in such a way as to
spread the loads over a wide area. There shall be a plate of equal
thickness on the inside of the monocoque with solid rivets or bolts (5/16”
minimum bolt diameter) through the non-ferrous material.
B. Front Hoop
Low front hoops must be no lower than the top of the steering
wheel. It is recommended the hoop extend to the belly pan. If not, it
shall be attached to the chassis with gussets and triangulation in
order to spread the loads. In automobiles of full height (top of the
steering wheel) monocoque or composite construction, a steel cap plate,
not less than .080” thick must be attached as a rub block.
C. Roll Cage Bracing
1. The main hoop must have 2 forward braces extending from the hoop and attached to the frame, monocoque, or front hoop. Braces must be attached as near as possible to the top of the hoop but must not be more than 6 inches below the top and at an included angle of at least 30 degrees.
If these braces do not extend to the front hoop, an additional brace or gusset (14 gauge - .078” minimum thickness) must be installed between the lower frame rail and the upper frame rail at the point of attachment of the forward hoop brace. If these braces do not extend to the front hoop, an additional brace or gusset must be installed at the point of attachment to the main rear hoop or lower frame rail or other major frame member in such a manner as to reinforce the attachment point to help prevent collapse of the frame rail at the point of attachment. These tubes shall be 1” x .080” minimum and gussets shall be 14 gauge - .078”minimum thickness.
2 seat Sports Racing cars with full width main hoops must incorporate a lateral brace to prevent lateral distortion of the hoop (See figure 12). All bracing on full width cages must be the same diameter and wall thickness as the main hoop.
Formula and single seat Sports Racing cars under 1500 lbs., may use bracing with a minimum dimension of 1.0” diameter
by .080” wall thickness.
attached to monocoque chassis must be welded to plates not less than .080” thick and backed up on the inner side by plates of equal thickness using bolts of Grade 5 or better with 5/16” minimum diameter.
2. The front hoop must have 2 braces near its top extending forward to protect the driver’s legs. It is recommended that this bracing extend to the bulkhead in front of the driver's feet; but in any case it must be integrated into the chassis to provide substantial support for the front hoop. Full width front hoop bracing shall be a minimum dimension of 1.0” diameter by .080” wall thickness tubing. Formula and single seat Sports Racing cars under 1500 lbs., may use tubing with a minimum dimension of 1.0” diameter by .080” wall thickness. When monocoque construction is used as bracing for the front hoop, it must be approved on an individual basis. If a high front hoop is used, it must be similar in shape to the rear hoop and have two horizontal tubes connecting the top of the front hoop to the top of the main hoop. The bracing for the main hoop remains the same.
3. Removable bracing must incorporate connectors of the
doublelug, tapered, or muff-type as shown in figures 14, and 15. The double-lug type must include a doubler, gusset, or capping arrangement so as to avoid distortion or excessive strain caused by welding.
D. Composite Chassis Safety Structures
1. The basic purpose of safety structures is to protect the
This purpose is the primary design consideration.
2. All cars must have at least 2 roll over structures, but the
use of titanium is prohibited.
The first roll over structure must be in front of the steering wheel, not more than 25cm forward of the steering wheel rim, and at least as high as the top of the steering wheel rim. The second roll over structure must not be less than 50cm behind the first. It must be high enough for a line extending from the top of the front structure to the top of the rear
structure to pass over the driver’s helmet when he is seated normally in the car with his helmet on and the seat belt fastened. This second structure behind the seat must be symmetrical about the lengthwise centerline of the car and comply with the following dimensions: The top of the roll bar must be at least 2 inches (5cm) above the driver’s helmet when the driver is seated in a normal driving position. No second roll structure on a composite chassis will be considered unless it contains
a main hoop having a minimum tubing size of 1.375” x .080" wall thickness. Supplemental braces must have a minimum tubing size of 1.00” x .080” wall thickness.
The roll bar must be capable of withstanding the following stress loading applied simultaneously to the top of the roll
bar: 1.5 (X) laterally
5.5 (X) longitudinally in either direction
7.5 (X) vertically
where (X) = the minimum weight of the car.
The induced loads must be carried over into the primary
structure of the chassis. The ability of the roll bar to bear and distribute the load
through the chassis must be demonstrated satisfactorily in test
conditions to the SCCA.
In conjunction with SCCA, manufacturers of cars utilizing carbon fiber composite survival cell
construction will be required to designate repair locations capable of proper evaluation and damage repair. In the event of damage to the chassis, repairs can only be made at these locations. Proper documentation must be made in the vehicle logbook. No car will be allowed to compete after damage without following this procedure.
E. Basic Design Considerations
1. The basic purpose of the roll cage is to protect the driver
if the car turns over, runs into an obstacle such as a guardrail or catch fence, or is struck by another car. It shall be designed to withstand compression forces from the weight of the car coming down on the rollover structure and to take fore/aft and lateral loads resulting from the car skidding along on its rollover structure.
2. No portion of the safety roll cage shall have an aerodynamic effect by creating a vertical thrust.
3. Roll cage or chassis design shall prevent engine intrusion
into the driver compartment.
a. Seamless, or DOM (Drawn Over Mandrel) mild steel tubing (SAE 1010, 1020, 1025) or equivalent, or alloy steel tubing (SAE, 4130) shall be used for all roll cage structures.
Proof of use of alloy steel is the responsibility of the entrant.
b. Minimum tubing sizes for all required roll cage elements (All dimensions in inches):
Vehicle Weight Tubing Size (inches) With Driver (outer diameter x wall thickness)
Up to 1700 lbs. 1.375 x 0.080
1701-2699 lbs. 1.50 x 0.095 or 1.625 x 0.080
Over 2699 lbs. 1.625 x 0.120 or 1.75 x 0.095
c. For purposes of determining tubing sizes, the vehicle weight is as raced without fuel and driver. The minus tolerance for wall thickness should not be less than .010” below the nominal thickness.
d. Either an inspection hole at least 3/16 inch diameter, but no greater than 1/4 inch diameter shall be drilled in a
non-critical area of the front and rear hoop as well as the one of the supplemental braces to facilitate verification of wall
thickness; or alternatively, wall thickness may be determined by non-invasive means and noted in the log book as inspected by such means. Formula Cars and Sports Racing cars with alternate roll structures are not required to have inspection holes, the wall thickness will be indicated on the back of the homologation certificate.
5. One continuous length of tubing shall be used for the main hoop member with smooth continuous bends and no evidence of crimping or wall failure. The radius of bends in the roll
cage hoop (measured at centerline of tubing) shall not be less than 3 times the diameter of the tubing. Whenever possible, the roll cage hoop should start from the floor of the car, and, in the case of tube frame construction, be attached to the chassis tubes by means of gussets or sheet metal webs with support tubes beneath the joints to distribute the loads. It is
recommended that gussets be used.
6. Welding shall conform to American Welding Society D1.1:2002, Structural Welding Code, Steel Chapter 10, Tubular Structures.
Whenever D1.1 refers to “the Engineer” this shall be interpreted to be the owner of the vehicle. Welds shall be continuous around the entire tubular structure. All welds shall be visually inspected and shall be acceptable if the following conditions are satisfied:
a. The weld shall have no cracks.
b. Thorough fusion shall exist between weld metal and base metal.
c. All craters shall be filled to the cross section of the weld.
d. Undercut shall be no more than 0.01 inch deep.
7. Aluminum bronze or silicon bronze welding technique is permitted, but extreme care shall be used in preparation of parts before bronze welding and in the design of the attaching joints.
8. Forward braces and portions of the main hoop subject to contact by the driver's helmet (as seated normally and restrained by seatbelt/shoulder harness) shall be padded with a non-resilient material with a minimum thickness of 1/2 inch. Padding meeting SFI spec 45.1 or FIA 8857-2001 is strongly recommended.
9. Cars may compete with FIA homologated cages provided the cage was built by the manufacturer or a manufacturer-designated shop/team and approved for use.
F. Exceptions for Formula Cars and Sports Racing cars Any roll hoop design which does not comply with the specifications in
9.4.5, will only be considered if it is accompanied by
engineering specifications signed by a registered engineer. No alternate roll hoop will be considered unless it contains a main hoop having a minimum
tubing size of 1.375” x .080” wall thickness. The roll bar must be
capable of withstanding the following stress loading applied simultaneously
to the top of the roll bar: 1.5 (X) laterally, 5.5 (X) longitudinally
in both the fore and aft directions, and 7.5 (X) vertically, where (X) = the
minimum weight of the car.
G. Front Impact Attenuation
1. All formula cars registered or homologated with SCCA as of 1/1/1986 must have a front impact attenuation device meeting at least one of the following criteria:
A. An FIA-approved front impact attenuation structure.
B. A metallic structure, securely attached to the front bulk head, with a minimum cross section of 200 sq cm (31 sq in.), 40 cm (15.75 in.) forward of the clutch and brake pedals (not depressed), constructed of a minimum of 18 gauge 6061-T4 or equivalent aluminum.
C. A non-metallic composite structure, securely attached to the front bulkhead or incorporated into the nose piece, with a minimum cross section of 200 sq cm (31 sq. in.), 40 cm (15.75 in.) forward of the clutch and brake pedals (not depressed), constructed of a minimum of 6 mm stabilized (e.g., honeycomb) material with inner and outer reinforcements of a minimum of 2 5-ounce laminate material (fiberglass, carbon, Kevlar, and so on).
2. Formula Vee and other formula cars using the VW sedan H-beam front suspension must satisfy the requirements of section 9.1.1.C.3.A.10 or use any of the structures listed in 9.4.5.G.1.
3. Formula Mazda cars may use the spec front wing support as a front crush structure, or any of the structures listed in G.1 above.
4. Radiators may be incorporated in impact attenuation structures.
5. Composite impact attenuation structures may incorporate carbon and/or kevlar regardless of any class restrictions on materials.
6. Rear impact attenuation structures are strongly recommended for all formula cars, and may incorporate the materials and/or construction techniques listed above for front impact
7. Pre-1986 formula cars and all Sports Racing cars are strongly urged to use front and rear impact attenuation structures, and may incorporate the materials and/or construction techniques for front impact attenuation structures listed above.
End of the Roll Cage Rules
A.1. ASR Classification
GCR - 613
Racing Category Specifications
A class for
purpose built (i.e., road racing prototype, Can-Am, SR2,
highly modified single or two-seat, closed-wheel, open or closed
racing cars which meet the general regulations of Section 9 of
for Sports Racing Category cars, yet are unique in concept
liberal in specifications so as to provide innovative design latitude.
Homologation is required on all ASR cars, except
1. Former Formula
A (F-5000) cars registered as ASR cars before
conforming to the 1978-1984 Can-Am specifications,
aerodynamic skirts removed, registered as ASR cars
January 1, 2003.
3. ASR cars
registered prior to January 1, 2003 which meet
provisions of 9.1.9.A.1.n. These cars may be updated to
A.1.b-m specifications but they then shall meet all
requirements of Section A.1.b without exception, including homologation.
Exceptions to the
ASR specifications must be requested with the homologation
application and will be listed on the homologation certificate.
construction is unrestricted within the following limitations:
1. Chassis of
non-metallic composite construction shall be proven
FIA specifications for non-metallic composite chassis
being submitted to the SCCA for homologation. Single
sports racers, up to 1300 lbs., shall meet the requirements
FIA article 258A or 275. All sports racers over
shall meet the requirements of FIA article 258A only.
There are no
exceptions. Contact SCCA National Office for a
the relevant FIA specifications/SCCA requirements.
2. Chassis of
metallic tube and/or metallic monocoque construction
manufactured to be consistent with the safety
requirements outlined within these rules and the GCR.
Any engine(s) may
be used within the following limitations:
1. Piston or
rotary internal combustion, gasoline-fueled engines
turbines. Turbo and/or supercharging is permitted.
Fuel system is
unrestricted within the following limitations:
1. Fuel per GCR
Section 9.3 Fuel.
2. Fuel Cell
Vents: Fuel tank air vents shall be located at least
(9.843 inches) to the rear of the cockpit.
is unrestricted within the following limitations:
1. Self Starter:
Cars shall be equipped with on-board self-starter
on-board power supply controlled by the driver while in a
2. Lights –
Brake and Tail per GCR Section 9.3 Lights.
Transmission / Final Drive
final drive system is unrestricted within the following
1. Power shall
not be applied to more than two (2) wheels.
airfoils are unrestricted within the following limitations:
and floor per GCR Section 9.3 Firewall and Floor.
shall provide comfort and safety for driver and a
or for a driver only. All elements of the bodywork
completely and neatly designed and finished, with no
or makeshift elements.
a. The bodywork
as viewed from the side and above shall
mechanical components except that the intake,
and radiators may be exposed. The bodywork
extend over the full width of the tires for at least
(1/3) of their circumference as viewed from the
Ventilation slots are permitted. The tires shall not be
viewed from above, although the rear tires may
as viewed from the rear. Cycle-type fenders
only cover the tire and are not continuous with the
the body) are prohibited. Fenders shall be firmly
to the bodywork with no gap between body and
b. Width – The
maximum width shall not exceed 221cm (87
including all aerodynamic devices. However, no
shall extend more than 10cm (3.9 inches) beyond
tangent to the outer face of the front and rear
with tires. The minimum body width between the
rear wheels shall not extend inwards beyond a
plane connecting the centerlines of the front and
c. Visibility –
Bodywork shall provide visibility for the driver
and to both sides adequate for racing conditions.
Two functional doors, one on each
required and shall be capable of being opened
inside and outside of the car. Doors shall be hinged
leading or top edges only. The driver’s seat shall
of being entered from either side without the
manipulation of any part or panel (except for
removable steering wheel and removable cockpit
The driver’s seat shall be capable of
entered without the removal or manipulation of any
panel (except for a removable steering wheel and
cockpit opening of metallic chassis shall have the
extends over a length of 30cm (11.811 inches)
This minimal rectangular opening may exist
forward of the bracing, and required padding
be considered in these dimensions.
cockpit opening of non-metallic chassis shall be
to meet the FIA homologation requirements
258A or 275 for cars up to 1300 lbs; Article 258A,
cars above 1300 lbs.).
a. The mounting
apparatus of any part having an aerodynamic
(i.e. bodywork, floor, sidepods, wings,
etc.), shall be rigidly secured to the entirely
part of the car (chassis/monocoque), shall have no
freedom in relation to the entirely sprung part of
(chassis/monocoque), and shall remain immobile in
to the chassis/monocoque at all times. This allows
actively adjusted aerodynamic elements (e.g., wings,
b. No Aerodynamic
skirts per GCR Section 9.3 Aerodynamic
Within the preceding restrictions, only wearable
(fiberglass, Kevlar, carbon fiber, high density polyethylene,
polypropylene, Teflon, Lexan, or wood) may be
to the side panels as a rubbing strip. Ceramics,
plastics (e.g., Plexiglas), and other materials which
break-up causing hazardous track conditions are
c. Ground effects
are permitted, but may not be attained by
or bridging the gap between the bodywork and
surface. Any means adopted to circumvent this intention shall automatically be
regarded as a breach of
d. Leading Edges
of Airfoils: The leading edge of any airfoil
the front of the car shall not be sharp. Minimum
0.5cm (0.2 inches).
Exposed glass headlight lenses and bulbs on the front of the
is unrestricted within the following limitations:
1. All cars shall
be equipped with a full suspension system (e.g.,
torsion bars, etc.) front and rear. Rigid mounted
suspensions are prohibited. Monoshock/monospring systems
Unrestricted provided that it is of a safe/secure design and acts upon at
wheels at one end of the vehicle.
tires are unrestricted within the following limitations:
1. Tires shall
have a minimum speed rating of 120 mph or better.
shall be the same size and design (e.g., radial, bias-ply,
the right and left sides of the front axle(s), and same
design (e.g., radial, bias-ply, etc.) for the right and leftsides of the rear
2. Wheels –
Minimum diameter 10”, minimum width 6”. Wheels
identical for the right and left sides of the front axle(s),
identical for the right and left sides of the rear axle(s).
material shall be metal. Cars shall be equipped with a
four (4) wheels. Wire wheels are prohibited.
unrestricted within the following limitations:
1. Cars shall
have a braking system that acts upon all wheels of
vehicle. Chain/belt driven cars may have a single brake
that acts upon the differential, thereby applying braking
the two (2) drive wheels.
2. Cars shall be
equipped with a dual braking system operated by
control. In case of failure or leak at any point in the
effective braking power shall be maintained on at least
1. The minimum
weight of the vehicle as raced, without driver,
750 lbs. Cars of composite (e.g., fiberglass, carbon
Kevlar, etc.) chassis construction shall not exceed a
weight, as raced without driver, of 1500 lbs. Cars
conventional tubular space-frame or metallic monocoque
construction that are in excess of 1800 lbs, as raced
driver, require specific approval by the Club Racing
the Club Racing Technical Manager for homologation
Note: All ASR
cars shall meet all applicable portions of GCR Section 9.
per GCR Section 9.3 Mirrors. Additionally, there shall
least two (2) mirrors, each with a minimum 100cm²
of reflective surface.
2. Towing Eyes
per GCR Section 9.3 Towing Eyes. Additionally,
rollbar is faired-in, the fairing shall have rollbar access
allow for quick retrieval.
3. Side Intrusion
chassis, the area between the upper and lower
tubes from the front roll hoop bulkhead to the rear
bulkhead shall be protected by one of the following
prevent the intrusion of objects into the cockpit.
minimum of either .060” heat-treated aluminum
or equivalent) or eighteen (18) gauge steel,
outside of the main frame tubes.
body – at minimum, consisting of a double
five (5) oz., bi-directional, laminated Kevlar material
incorporated into the body which shall be securely
to the frame.
c. For either
method, the material used for the chassis braces
area shall be at least equivalent to the roll hoop
chassis are covered under the FIA chassis
chassis, there shall be a crushable structure,
attached to the front bulkhead, with a minimum
section of 200 cm² (31 in²), 40cm (15.75”) forward
clutch and brake pedals (not depressed) constructed
minimum of eighteen (18) gauge 6061-T4 or equivalent
Radiators may be incorporated in this structure.
chassis are covered under the FIA chassis homologation.
5. Driver’s Feet
chassis, the frame shall incorporate forward-facing
protect the driver’s legs and feet. The braces shall
from the front roll hoop to the front bulkhead. (The
bulkhead is defined as the furthest forward transverse
the main frame.) The soles of the driver’s feet shall
beyond the front edge of the wheel rims (in normal
i.e., pedals not depressed) and shall remain behind the
bulkhead. The lower main frame rails shall be a minimum
twenty-five (25) centimeters (9.84”) apart (inside dimension)
front bulkhead to the rear roll hoop.
Non-metallic chassis are covered under the FIA chassis homologation.
Registered Prior to January 1, 2003
is prohibited. Cars shall be classified
to engine displacement as follows:
Type Displ. (cc) Induction Weight (lbs)
Rotary Piston 2292
max. Unrestricted 1326
Stock block & cyl.
head 3001-4000 Fuel injection or one Holley 4150 1-11/16 1602
Stock block & cyl.
head 4001-5000 Fuel injection or one Holley 4150 1-11/16 1811
1. Engine, Rotary
a. Changing the
capacity of the working chamber(s) is prohibited.
b. The eccentric
shaft may be replaced with another of the
material, but no changes in eccentricity of
dimensions are permitted.
c. The rotor is
unrestricted providing the number of lobes
rotor housing is allowed only when submitted
manufacturer and recognized by the Club Racing
changes are allowed in the epitrocoidal curve in
e. Rotary engine
cars shall be equipped with a suitable muffler.
END of SCCA ASR Rules.
F600 Fastrack Rules Link, see this pdf
for the Side Pod Illustration.
Not Sure of the rules, they will keep the measurements
Wheelbase: Min - Max 80” 90 inches
Overall Length: Min - Max 110” 120 inches
Maximum 160 inches
Overall Width: Minimum 55 inches
Maximum 60 inches
No Shocks, only Rubber Springs with friction dampers will be allowed and
32mm Intake Inlet Restrictors below the throttle plate, ??? This
makes me not wanting to build a F600 car.
FORMULA 1000 PREPARATION RULES
Formula Formula 1000 is a restricted class. Therefore, all
allowable modifications, changes, or additions are as stated herein. There are
IF IN DOUBT, DON’T. Homologation is required for all cars.
A formula for purpose built, open-wheel, open cockpit racing
cars. F1000 allows converted Formula Continental, Formula 2000, Formula F, and
purpose-built motorcycle-powered tube frame chassis. Re-homologation as an F1000
is required for all converted cars.
A. The chassis shall be of tubular steel construction only.
Composite construction (defined as carbon fiber, Kevlar, honeycomb or fiberglass
in a structural application is prohibited, except as specifically allowed in
these rules. Stress bearing panels are not permitted except as specifically
allowed in these rules. Stress bearing panels are defined as sheet metal affixed
to the frame by welding, bonding, rivets, bolts, or screws which have centers
closer than 150mm.
B. The soles of the driver’s feet shall not extend beyond
the front edge of the wheel rims (in normal position; i.e., pedals not
depressed) and shall remain behind the front bulkhead. The lower mainframe tubes
shall be a minimum of 25cm apart (inside dimension) from the front bulkhead to
the rear roll hoop.
C. The area between the upper and lower mainframe tubes from
the front roll hoop bulkhead to the rear roll hoop bulkhead shall incorporate
one of the following:
1. Panel(s), minimum of either .060 inch heat-treated
aluminum (6061-T6 or equivalent) or eighteen (18) gauge steel, attached outside
of the chassis tubes.
2. Reinforced body - at a minimum, consisting of a double
layer, five (5) oz., bi-directional, laminated Kevlar material incorporated into
the body which shall be securely fastened to the frame. For either method,
fastener centers shall not be closer than 150mm (no stress-bearing panels). The
material used for the chassis braces in this area shall be at least equivalent
to the roll hoop brace material.
D. A stress-bearing floor pan/undertray is permitted between
the front bulkhead and the rear axles. Composite or stabilized materials shall
not be used for stress-bearing panels. The mountings for brake and clutch pedals
and cylinders (front bulkhead), instruments, (front roll hoop bulkhead), and
rear roll hoop bulkhead (behind the driver) may be stress bearing panels, also.
The firewall portion of the rear roll hoop bulkhead (panel) shall extend the
full width of the cockpit. Forward facing air ducts may be installed to deliver
air directly to the engine area. Air duct openings may be located within the
cockpit provided the firewall is extended to prevent flame and debris from
reaching the driver. (Any shape may be used to form the firewall extension.) All
firewall inlets shall prohibit passage of flame and debris.
E. Brackets for mounting components, such as the engine,
transmission, suspension pickups, instruments, clutch and brake components, and
body panels may be ferrous, aluminum alloy, or magnesium alloy, of any shape,
and fastened to the frame in any manner.
F. No engine oil or water tubes are permitted within the
G. It is not permitted to construct any suspension member in
the form of an asymmetrical airfoil or to incorporate a spoiler in the
construction of any suspension member. Symmetrical streamlining of suspension
members is permitted.
H. Front and rear impact attenuation structures are strongly
recommended. Impact attenuation structures shall be securely attached to the
entirely sprung part of the car. Attachment of any front impact attenuation
structure shall not extend more than 50mm to the rear of the front bulkhead.
Impact attenuation structures may be fabricated from metallic and/or composite
H.3. Bodywork and Airfoils
A. See Table 5. (Airfoils are a requirement for this class.)
Forward facing roll bar/roll cage bracing and required
padding will not be considered in the cockpit opening dimensions shown in the
B. The driver’s seat shall be capable of being entered
without the manipulation or removal of any part or panel, except the steering
wheel and/or driver’s head surround structure. The steering wheel and head
surround must be removable by the driver without the use of any tools.
C. Carbon fiber is prohibited in any external panels or any
panels licked by the airstream (e.g., radiator ducting or engine air inlet),
with the exception of impact attenuation structures. Carbon fiber may be used in
internal panels and components (e.g., instrument panel, radio boxes) unless
D. The entrant shall designate a flat rectangular reference
area with minimum dimensions of 30cm by 30cm. This reference area is located on
the lower surface of the car (the surface licked by the air stream) between the
rear of the front tire and the front of the rear tire. The center of the
reference area must be no more than 75mm from the longitudinal centerline of the
vehicle. Between the rear of the front tire and the front of the rear tire, no
point on the lower surface of the car (the surface licked by the air stream)
shall be more than 25mm above the plane determined by
FCS, the reference area designated by the entrant and on a line
perpendicular to that reference plane. No point on the lower surface of the car
may be below the plane determined by the reference surface on a line
perpendicular to that reference plane, except as specifically permitted herein.
Compliance with these requirements shall be accomplished by placing a straight
edge on the reference surface designated by the entrant and verifying that the
requirements are met. A maximum of four (4) rub blocks of maximum dimension 75mm
by 125mm are allowed anywhere on the lower surface of the chassis, and may
extend below the reference plane.
E. A diffuser is permitted behind the front of the rear
tires. The diffuser may be divided internally into multiple sections. The radius
of transitions between the diffuser sides and adjacent horizontal structures may
be up to 25mm. The width of the diffuser, as measured between its sides and
above any radi used transitions, may not exceed 95cm in any lateral section.
Strakes within the diffuser are allowed.
F. Movable aerodynamic devices, including aerodynamic
skirts, are prohibited.
G. The maximum permitted width of the bodywork is 150cm. The
width of the entire lower surface of the car between the rear of the front tires
and the front of the rear tires shall not exceed the maximum width of the
bodywork by more than 50mm and shall not exceed 150cm.
H. The safety roll bar/roll cage and engine air box are not
included in the maximum height restriction (dimension C in Table 5).
A. Motorcycle-based 4-cycle up to 1000cc.
B. Engine internals and compression ratio must remain stock.
The competitor must present, on demand, an original factory manual for the
engine to allow compliance verification.
C. The stock ECU shall be used. The ECU fuel map may be
changed. Devices that modify inputs to the ECU (e.g., Power Commander) may be
used. Stand-alone after market ECUs are not permitted.
D. Turbochargers and superchargers are prohibited.
E. Carburetion and fuel injection are unrestricted.
F. The exhaust system and exhaust manifold are unrestricted,
within SCCA safety regulations.
G. The lubrication system is unrestricted. A dry sump system
is permitted; any oil pan and/or baffling is permitted.
H. Oil coolers are unrestricted.
I. The cooling system is unrestricted. Radiators, if housed
in or incorporating a cowl air-scoop deflector, shall comply with bodywork
J. The stock chain tensioner may be replaced with any
mechanical chain tensioner.
H.5. Inlet Restrictors
The air inlet system is unrestricted at this time. However,
the CRB may require the use of an inlet restrictor at any time by publishing the
requirements in FasTrack.
H.6. Fuel system
The fuel system is unrestricted within the following
A. Any fuel permitted for any class per GCR 9.3 Fuel, may be
used in F1000.
B. Fuel Cell Vents: Fuel tank air vents shall be located at
least 25cm to the rear of the cockpit.
C. Fuel capacity: maximum 10.83 gallons.
H.7. Electrical System
The electrical system is unrestricted within the following
A. Self-starter: Cars shall be equipped with an on-board
and an on-board power supply controlled by the driver while
normal driving position.
H.8. Transmission/Final Drive
A. Rear wheel drive only is permitted.
B. The final drive ratio is unrestricted. Internal
transmission gears shall remain stock.
C. Cars may use sequentially shifted motorcycle
transmissions Reverse gear is not required.
D. All gear changes must be initiated by the driver.
Mechanical gear shifters, direct-acting electric solenoid shifters, air-shifters
and similar devices are permitted. Devices that allow pre-selected gear changes
E. The clutch assembly is unrestricted.
A. All suspension components shall be of steel or ferrous
material, except that hubs, hub adapters, hub carriers, bell cranks, pivot
blocks, bearings and bushings, spring caps, abutment nuts, anti-roll bar links,
shock absorber caps, and nuts may be aluminum alloy or magnesium alloy.
B. Springs: steel only.
C. Shock absorbers: Steel or aluminum alloy body.
D. Control arms and all associated items that attach
directly to the chassis members shall be boxed in or captured to prevent
intrusion into the cockpit.
E. Front A-arms shall be equipped with anti-intrusion bars
to limit intrusion into the cockpit.
A. All pistons in a given caliper must be of the same size.
Calipers must be ferrous or aluminum alloy.
B. Brake rotors are restricted to ferrous material.
H.12. Wheels and Tires
Thirteen (13) inch diameter wheels with a maximum rim width
of ten (10) inches are the only wheel sizes permitted. Material is unrestricted
providing it is metal.
H.13. Minimum weight
Minimum weight is 1000 lbs.
F1000 Dimensions - Table 5
Dimension (Refer to FC drawing) Measurement (cm)
A. Maximum rear overhang from rear wheel axis 80
B. Maximum front overhang from front wheel axis 100
C. Maximum height measured from the ground 90
D. Exhaust height measured from the ground 20-60
E. Maximum height of any aerodynamic device Rim height
H. Maximum width of entire car 185
I. Maximum rear aerofoil width (includes endplates) 95
J. Maximum width of body and lower surface of the car behind
the front wheels 150
K. Maximum front
cockpit bodywork opening
cockpit parallel opening length
cockpit overall opening length
exhaust length from rear wheel axis
5 & 6. Minimum
height is measured with the driver aboard. The safety
bar/roll cage and engine air box are not included in the maximum
restriction (dimension C).
End Of The F1000 Rules
1 3/4" Tube, Sports Racer
This is very close to how the 6 Wheeler
Chassis will look
The Basic Chassis Structure of the 1 3/4" Tube
The Fuel Cell will be in the Truss Area Bulk Head Behind the
Seat. It's the 10 Gallon Fuel Safe # SM110 or FF110.
There will not be a Fuel Cell Aft of the Main Hoop, as this
The Center section will be about 2" longer & is the same exact
The Rear Rims & Tires are any size or width, 1 piece rims
including the 4 on 100 Miata Rear for the Bike Motor chain Drive.
The 4 Front Rims will be 8" max width & 225-45-15 Tires
This is the 1000cc Closed Cockpit
The Closed Cockpit Cars will look somewhat
Above is the First Closed Cockpit, the Side Bars are Now Lower at
the Main Hoop.
Chassis Build Out
Front, Miata Suspension, Axel Center Line can be up to 2" Aft of
the Front Face of the Foot Box Bulk Head and it, shall be a minimum
of 18" Wide by 12" High, also the bottom of the front Horizontal
Foot Box Tube may be up to 6 1/2" above the flat reference
plane (the flat bottom chassis tubes).
This Foot Box bulkhead Shown below, is raised 5" above the flat
reference plane & the
lower suspension bolts are about 7 1/4" above.
Above is Miata Lower Front Suspension Mounts, they use the OEM Cam
Bolts to mount the Lower A-Arms. This 8 piece kit is 1/8" plate,
they are oversize, you'll cut to size.
lower A-Arm mounts should be .120 or 1/8" Steel
Above is OEM Miata Front Suspension, This was pulled from a salvage
yard and the total cost was $80 for the right & left sides.
|The Open Top Car's Top Front Structure
|The Rack & Steering is next.
RTS RACIG CATEGORY
These specifications are part of the SCCA GCR and all
automobiles shall conform with GCR Section 9.
The rules posted here are for furtherance of SCCA activity.
Tube Weights: lbs per ft. from Marmon/Keystone 's web
.095 Wall .065 Wall
1 1/2" = 1.426 /ft
1 3/8" = 1.299 /ft 1 3/8" = 0.909
1 1/4" = 1.172 /ft 1 1/4" = 0.823
1" = 0.918 /ft 1" = 0.649 /ft