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USA MODIFIED RULES
International Championship Auto Racing
2008
UNITED
ASPHALT MODIFIED RULES
Revised 12.11.07
Note: Sanctioning Body and/or Track does not express or implies any
warranty of safety resulting from the publication of, or
compliance with these rules and/or regulations. These rules are
intended as a guide to conduct this sport and are not in any way
a guarantee against injury or death to any participant,
spectator, or official.
1.
SAFETY EQUIPMENT:
Snell-rated SA95,
SA2000, SA2005 helmet required. Roll bar padding required in
drivers compartment (Fire retardant highly
recommended). SFI full fire suit required. Fire retardant
neck brace, gloves and shoes required. (Fire retardant head
sock and underwear; head and neck restraints; collapsible
steering shaft; highly recommended). Driver side window net
required, and must be mounted so that the latch is at the top
front of window. Minimum three inch wide, five point safety belt
assembly required, must be mounted securely to the role cage. (Highly
recommended to be no more than one year old). Fire
Bottle system required. (A separate, heat activated, Fire
Bottle on the fuel cell is highly recommended) Kill switch
required within easy reach of driver and must be marked OFF
and ON.
2.
FRAME:
1964 or newer OEM
perimeter American made rear wheel drive passenger car frame
only. (Reproduction 68-72 Chevelle frames are approved).
No sports car frames. No 2002 & up Ford Crown Vic or similar
frames allowed. No strut front suspension of any kind allowed.
No tube clips allowed. Frame must be full and complete, cannot
be widened or narrowed, and must be able to support roll cage on
both sides. Exceptions: Weight jack in original center
line of spring tower; frame may be cut a maximum 36 inches
forward from center of rear housing; horns may be removed in
front of steering box; front crossmember may be notched and
boxed for radiator and/or steering clearance; maximum 7 inch
wide opening in side of spring tower for spring removal. OEM
upper A mounts may be replaced with aftermarket mounts. Maximum
4 inch wide by 4 inch tall frame stiffener may be welded
directly to outside of left OEM frame rail. Left side OEM frame
rail may be notched for seat and foot clearance. Minimum
wheelbase 108 inches, maximum 112 inches, both sides. Maximum
overall width, front and rear, shall not exceed 78 inches from
outside of tire, to outside of tire. No part of frame or body
shall be lower than 4 inches from ground, except the front crossmember, in race trim.
3.
ROLL CAGE:
Must consist of
continuous hoops, minimum 1.75 inch O.D. tubing, with a minimum
wall thickness of .095 inch for the main cage. Frame mounted in
at least 6 places, low carbon or mild steel recommended. Must
consist of a configuration of front, rear, and top hoops
connected by tubing on the sides or side hoops. Drivers head
must not protrude outside cage with helmet on. Roll cage must be
securely supported and braced with minimum 1 cross bar in top
halo. Foot protection bar(s) required. Main cage no further
forward than rear of engine. All bars forward of the cage must
be lower than the hood.
4.
DOOR BARS:
All driver side door bars
and uprights must be a minimum 1.75 inch and .095 inch wall
thickness. Minimum 4 driver side door bars, parallel to the
ground and perpendicular to the driver, and welded to the front
and rear roll cage. Passenger side must have at least 1 cross
door bar, horizontal or angled, and 1 top door bar, minimum 1.5
inch O.D. Steel door plate, 16 gauge (.065) minimum thickness,
must be securely welded to outside of the driver side door bars
and cover the area from top door bar to bottom door bar and from
rear hoop down post to front cage down post.
5.
BODY:
(See Diagram) must be same width, front to rear, and
parallel to the OEM frame. Engine compartment must remain open
on both sides. Hood must be enclosed at rear. No panel in front
of right door to engine compartment. No inner panels. Must have
front windshield support and rear window support posts. Driver
and passenger side windows must have at least 12 inch opening (height
and width), measured at center of window, between lowest
point at top of window, weather roof or roll cage, and the
highest point at bottom of window, weather interior or body. May
use Lexan in sail panels. No full windshields. Roofs must be
fiberglass or aluminum (no carbon fiber) full size,
rounded and stock appearing (No flat roofs). Must run
full upper and lower nose. No plastic body parts. Exception:
Howe part #s 622 & 624 are the only approved plastic
body parts. No wings or aero dynamic devices inside or outside
the car. Outside of tires must be the widest part of car.
Quarter panels and B/C pillars must be 2 distinct pieces. Oil
coolers/radiator must not protrude above interior or outside of
body. (Spoiler:) A 4 inch by 66 inch spoiler 45 degrees
to the deck is allowed, with all braces to the rear of
the spoiler.
6.
DRIVER COMPARTMENT:
Must have a minimum 3
windshield bars in front of the driver. Lexan or aluminum cowl
panel in front of the driver can be no wider than the cockpit
and no farther back than the steering wheel. Minimum .125 inch
aluminum, or 22 (.035 inch) gauge steel, complete floor pan
required. Aluminum high back seat only and must be bolted in
securely, inside the left OEM frame and ahead of the rear tires.
Bottom of seat can be no lower than bottom of frame. (NASCAR
style right and left head, shoulder supports and leg restraints
highly recommended). Driver must be sealed off from track,
driveline, engine, fuel cell, battery and pumps. No driver
adjustable devices allowed in cockpit except brake adjusters.
Mirrors in the center of car and/or Radios allowed.
7.
FRONT SUSPENSION:
All components must be
steel, unaltered OEM, in OEM location, and replaceable by OEM
parts. Exceptions: Tube type upper A frames with or
without aluminum or steel cross shaft, and mounts can be moved;
stamped steel OEM replacement lower a-frames; rubber, nylon, or
steel lower a-frame bushings; no offset bushings; welded or
bolted shock mounts on lower a-frames; (No fabricated lower
a-frames); Lower a-frames must be right and left, and of the
same design. Lower a-frame mounts and bolt holes on frame must
be in OEM location. OEM type ball joints only. Sway bar must be
OEM type, no splined bars.
8.
STEERING:
No rack and pinion. All
components must be steel, unaltered OEM, in OEM location.
Exceptions: tie rod ends and adjuster sleeves may be
replaced by a minimum .625 inch steel rod ends and steel tubes;
OEM spindles can be modified for ball joints and tie rod ends;
passenger car drop spindles allowed; (No made for racing or
fabricated spindles.) Bolt on
spindle savers allowed; spindles must be right and left, and of
the same design; steel steering shafts and knuckles only;
steering quickener, steering wheel and quick release may be
aluminum; driver compartment steering may be modified, but must
be kept on left side. OEM center link or OEM after market type
center links allowed.
9.
SHOCKS:
Shocks must be, Non-adjustable, with No external canisters, and
have a racer price of less than $250.00 New per shock.
One (1) shock per wheel, with one (1) additional shock allowed
in the lift / pull area. No air shocks. No shock covers.
10. SPRINGS:
Steel coil and leaf
springs allowed. Coil springs must be at least 4.5 inches O.D.
No torsion bars or air bags. Exception: Pull bar
may utilize smaller O.D. springs.
11. REAR SUSPENSION:
No independent rear
suspension. All components must be steel.
No covers allowed. All trailing
arms/link bars must be made of steel tubing. Rear of frame may
be altered to accept leaf or coil springs. Steel coil-over
eliminators, and steel or aluminum (5) coil-over kits, allowed
on the rear only. Must conform to shock and spring rules. One
(1) mechanical traction bar only. No rear sway bars. Aluminum
panard bar adjuster allowed.
12.
REAR END:
Any steel approved
OEM passenger car or truck rear end allowed. Closed, steel tube
Quick changes allowed. Safety hubs (floater) mandatory.
Steel axles only. No cambered rear ends. One (1) piece drive
flange only. All components must be steel. Exceptions:
lowering blocks, axle caps, rotor plates, and drive flanges.
13.
BUMPERS:
(See diagram) Steel
bumpers must be on front and rear at all times and welded or
bolted securely to the frame. Must be a minimum 1.25 inch O.D.
tubing, .065 wall thickness. Two bar front bumper must be
mounted frame end to frame end, no wider than width of OEM frame
horns. Bottom loop must be parallel to the ground. Top bar must
be directly above bottom bar, minimum 6.5 inches apart, measured
center to center. Aluminum I-beam rear bumper are allowed. No
sharp edges.
14.
WHEELS:
Eight (8) inch steel
wheel only, measured from inside bead to inside bead. No bead
locks, screws, or rim mounted bleeder valves. Steel and aluminum
wheel spacers are allowed.
15.
TIRES:
No softening,
soaking, conditioning, siping, or grooving of tires. No re-caps.
Soaking of tires is strictly prohibited. (This rule
applies to ALL tires in the pits, on the car, in the trailer or
hauler, ALL tires) Tires may be checked at any time. Tire
type: TO BE ANNOUNCED.
16. BRAKES:
Must be steel OEM
type, operative on all 4 wheels, drum or disc. Must maintain
minimum OEM dimensions for hub/rotor and calipers, cannot be
drilled or lightened. Bolt pattern may be changed. Larger studs
allowed. Rear rotors may be aftermarket, minimum .810 inch
thick, vented rotors only. No scalloped or drilled rotors.
17. EXHAUST:
Round tube headers only.
All primary tubes must enter into 1 collector, at the end of the
header. Mufflers required. Right side exhaust must exit under
the car (not out right side door).
18. FUEL SYSTEM:
Mechanical or belt driven
pump only and must be mounted on front of motor. Racing fuel
cell required 22 gallon maximum capacity, square or rectangle in
shape (no tear drop, wedge, or exotic F-1 type fuel
cells allowed). Must be in a minimum 22 gauge steel
container. Cell must be securely mounted behind the rear axles
and between the rear tires. Cell must be no lower than bottom of
rear end housing. Cell must be mounted with a minimum 2 solid
steel strap around the entire cell, 2 inches wide and .125
inches thick or equivalent. All cell mounts must be steel and
securely welded or bolted to the frame. Protective tubing must
cover rear of cell and extend past both ends of the cell. No
part of the cell is to be lower than the protective tubing.
Vents and lids must have check valves. Fuel line pick up must be
on top of cell. No cool cans and (1) fuel filter only.
19.
FUEL:
Racing gasoline or
alcohol allowed.
20.
WEIGHT:
Minimum weight limit of
2,400 pounds, 1000lbs. right side (No Tolerance),
after race with driver and helmet in car setting in normal
driving position. Weights must be securely mounted with at
least (2) half inch bolts to frame or roll cage, and painted
white with car number on it. No weight outside of the body. No
titanium, carbon fiber, or exotic materials used on race car. No
gun-drilled, tubular, hollow bolts or studs. Steel fasteners
only.
21.
BATTERY
/ STARTER:
One 12/16 volt
battery only, must be securely mounted between frame
rails, behind crossmember, in front of rear end and outside of
driver cockpit, with positive terminal covered. Car must have
the capacity of starting without being pushed or pulled.
Standard or reverse mount starters allowed.
22. GAUGES / ELECTRONICS:
No electronic
monitoring computer devices capable of storing or transmitting
information. Exception: Analog tach. No adjustable
ignition control boxes. One (1) 12/16 volt ignition box allowed,
with rev chip, must be out of reach of driver. No additional
ignition accessories allowed. No magnetos. No traction control
devices.
23.
TRANSMISSION:
Must have at least
two forward gears and one reverse, plus a neutral position. With
engine running and car in still position, must be able to engage
car in gear and move forward, then backward. OEM production type
or approved aftermarket transmissions (Bert, Brinn, Falcon)
allowed. (2-speed, 3-speed, 4-speed and automatic). No
5-speed or more transmissions, No in and out boxes allowed.
Standard clutch type transmissions must have a blow proof bell
housing (steel or aluminum). Automatic transmissions must
have an approved scattershield.
24.
DRIVE SHAFT:
Minimum 2.5 inch
diameter, steel drive shaft, painted white. Steel
slip-yokes only. 360 degree drive shaft loop required and must
be constructed of at least .25 inch by 2 inch steel or
equivalent, mounted 6 inches back from front u-joint.
25. ENGINE COMPARTMENT:
Rear of engine must be
mounted at least 72 inches forward from centerline of rear axle.
Engine offset must be kept within 2 inches of centerline of
front crossmember with engine level. Minimum 11 inches from
centerline of crank shaft to ground. Radiator must be mounted in
front of engine. Cooling system may be modified. No anti-freeze.
26. ENGINE:
Any American make
engine allowed. Steel block. No machine work to the outside of
block (lighting). Wet sump oiling system only. One (1)
naturally aspirated two or four barrel carburetor only. (No
fuel injection) No magnetos.
27.
NUMBERS / DECALS: All numbers shall be in
contrasting color from body, affixed to both doors and
top, be at least 4 inches thick and 20 inches tall, and be
readable from the passenger side of car. Competitors are to
reserve the front 24 inches of each door and the first 6 inches
of the roof for Sanctioning Body and/or Track Sponsors.
(Failure to run sponsor decals will result in 50% loss of
purse.)
28. OVERALL: (A)
Sanctioning Body
and/or Track reserves the right to change, modify, add or delete
to these rules as they deem necessary to ensure fair,
competitive, and affordable racing. (B) Sanctioning
Body and/or Track reserves the right to confiscate any part or
parts deemed by their Officials to be outside the rules. This to
include tires, or any other part(s) of any race car, at any
event, at any time. (C) E.I.R.I. (Except In Rare
Instances) All decisions of the Officials are final and
binding without exception.
29. GENERAL COMPETITION:
(A)
Drivers shall be responsible for the conduct and actions of all
crewmembers, and any unsportsmanlike conduct shall be grounds
for disqualification or punitive action as determined by
Sanctioning Body and/or Track. Sanctioning Body and/or Track
shall have the authority to disqualify members and assess
fines. (B) All discussions with Officials shall be
conducted in a professional manner and at a proper distance.
(C) Drivers under the age of 18 must produce a signed and
notarized Parental Consent form by Parent or Legal Guardian.
(D) Sanctioning Body and/or Track may require, at its
option, a competitor(s) to under go a physical or drug testing
before said individual(s) are allowed to compete.
The
absence of a particular rule does not necessarily
mean its
approval!
ASPHALT BODY DIAGRAM & DIMENSIONS
(A)
20
Max. 16 Min. (Ground to center of bumper front & rear)
(B)
6.5
Min. (Center to center)
(C)
52
Max. 42Min.
(D)
6
Max. Hood sides 3 Max. Rake in hood.
(E)
32
Max. (Bumper & Nose)
(F)
6
Max. (Scoop/Deflector)
(G)
4
Min. at Nose and Sides 8 Min. at Quarters
(H)
19
Max. (Same both sides)
(I)
112
Max. 108 Min.
(J)
29
Max. 22 Min.
(K)
72
Max. Or not past back of block, right side. Left side may extend
forward to cover foot box if necessary.
(L)
18
Max. 12 Min. Opening, both sides.
(M)
With
4 level, must have 2 gradual clearance at rear and no more
than 5 at front
(N)
120
Max. 106 Min.
(O)
45
Max. 34 Min.
(P)
3
Max. height at rear of sail panel, gradual slope from roof to
this point. (4 x 66 Max. spoiler 45 degrees to the deck is
allowed with supports to the rear only.)
(Q)
Interior slope is 6 Maximum. Front to rear and
flat across. If flat at front half of interior you have used up
50% of your 6 so from behind the driver to the rear you only
have 3 of slope. Top of interior must be flush with top of
doors and quarter panels.
(R)
38
Max. 28 Min.
(S)
38
Max. 24 Min.
(T)
66
Max. 24 Min. No narrower than radiator
(U)
52
Max. 44 Min.
(V)
56
Max. 41 Min.
(W)
Tires must be the widest part of the car. Must be able to see
side wall of tire from front, top, and rear.
(X)
66
Max. 53 Min.
(Y)
8
Panel / 90 degrees to ground. Must be solid, attached to the
deck and extend to the quarter panels, securely fastened.
(Z)
Aluminum I beam or tubular steel rear bumpers allowed, must
have rounded nerf bars that follow quarter panel and connect
back to frame on both sides.
All Rights Refused: Feel
free to copy these rules and use in any way, shape or form.
Lets keep asphalt modified racing affordable and all on the
same rules!
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