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USA MODIFIED RULES
International Championship Auto Racing
2007
 Mission
Statement
The
Mission of the USA Modified Series is to work with competitors
and promoters to form an alliance that is financially and
professionally beneficial to all, and auto racing as
a whole.
MODIFIED TECHNICAL RULES
01-13-07
NOTE: ‘07
RULE REVISIONS IN RED INK!
The absence of a particular rule
does not necessarily mean its approval.
Rules will be judged by Three Step Criteria
1. Safety
2. Competitive Advantage
3. Spirit of the USA Rules
1. GENERAL MEMBERSHIP
A. Members
shall support and embrace the mission statement and shall not
participate in any practice detrimental to the partnership.
Violations shall be brought to the attention of an official, and
penalties assessed against any members not addressed by these
rules, or any situation that develops not covered by these rules,
shall be referred to USA. USA does not express or implies any
warranty of safety resulting from 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.
B. Drivers
are responsible for the conduct and actions of all crewmembers,
and any unsportsmanlike conduct shall be grounds for
disqualification or punitive action as determined by USA Race
Director. USA officials shall
have the authority to disqualify members, and assess fines.
C. All
persons competing in a USA sanctioned event shall be required to
have a current USA membership license in good standing. Said
license for driver is $100.00 per year, payable when registering
competition number. Drivers should be registered by January 15th,
2007 In the event of duplicate numbers some drivers may be
required to change their number based on 2006 USA
Points. Temporary licenses are
available an each event for
$25.00 for those who wish
to compete in one series event. Licenses may be
waived for special events.
D. Decisions
of officials are final and binding without exception. Assessment
and implementation of all penalties, fines forfeiture of prize
money, trophies, points, contingencies, shall without exception be
at the discretion of USA. In exceptional cases, track rules may
take precedence over these rules. However, when discrepancies
occur, they shall immediately be brought to the attention of USA
officials.
E. All
discussions shall be conducted in a professional manner and at a
distance of 3 feet (arms length).
F. Drivers
under 18 years of age must produce a signed and notarized parental
consent form by parent or legal guardian at the time of
application for membership and before competing in any USA event.
The sanctioning body may require at its option, a competitor or
competitors, to under go a physical or drug testing before said
individual of individuals are allowed to compete in any sanctioned
event. Eligibility will be on a track to track basis and solely at
the discretion of USA Officials and Track Promoters.
2. GENERAL COMPETITION
A. Brakes must operate on all four
wheels and must lock-up during inspection. No brake shut-off
devices allowed. No scalloped rotors, vented rotors only.
B. Exhaust system must direct
gasses away from cockpit and away from possible fuel spillage
areas. Right side must exit under car only.
C. Racing fuel cells required and
must be securely mounted; protected by roll cage tubing, have at
least two solid straps 2” wide around cell. Fuel cells must be
square or rectangle in shape and enclosed in metal
containers, and located between rear tires (cells may not be
mounted to the extreme left rear of cars). No part of fuel cell
should be lower than protective tubing on both sides of fuel
cell. Fuel cells must have check valves, and pick-up must come
out top of cell. Fuel cells are limited to 22 gallons maximum
capacity. Bottom of the fuel cell must be no lower than the
bottom of the rear end housing. No tear drop, wedge, or exotic
F-1 type cells. Steel fuel cell can
only! Minimum thickness 22 Gauge
D. Fuel may be either gasoline or
alcohol. No nitrous oxide.
E. Battery (1, one) must be
securely mounted and shielded. Must be located between the front
cross member of the frame and the rear axle.
F. Loose object and/or weights must
not be used in driver’s compartment or out side of the
body or hood area. Weights must be securely mounted and
must be painted white with car number and attached with at least
½” bolts. No weight will be permitted outside body
or frame, i.e. weight is not to be visible to spectators and be
seen as a contrast to body or frame.
G. No rack and pinion steering
allowed. Steering box must be OEM and remain within original bolt
pattern for type of frame used. Cockpit steering may be modified
to suit driver, but must remain located on left side.
H. Radio communications between
competitor and team is authorized.
I. Aluminum wheels, hubs,
calipers, “A” frames or spindles, or any other aluminum suspension
parts are not allowed. Plastic wheel not allowed. Calipers
cannot be lightened and must be OEM. Rotors cannot be lightened
or drilled. Rotors may be re-drilled for different bolt patterns
or larger studs. Aluminum pan hard bar adjusters are
legal.
J. No adjusters of chassis or
engine inside race car, or in reach of driver ant any time.
One (1) MSD box or
equivalent per car only.
K. WEIGHT RULE: First five feature
finishers must weigh immediately following feature race, with
driver and helmet in car, setting in a normal racing position.
Cars must weigh no less than 2,400 lbs. NO TOLERANCE. Maximum
fifty eight percent (58%) left side or no less than 1000 lbs right
side weight with driver in car, setting in a normal racing
position. Officials retain the right to weigh any
car before, during of after race event. USA Series
scales are deemed official and will be used at all events.
3. SAFETY
A. The driver shall accompany
racecar at time of technical inspection and be equipped with all
personal safety equipment. He/She must be fully capable of safely
operating racecar for the duration of all events. Officials
retain the right to perform drug testing on any competitor at any
time.
B.
Fire suppression systems are
mandatory for touring events.
… A push button/pull Safety Systems on board Firebottle type
suppression system, is required with nozzles on driver only. A
separate heat activated Firebottle on the fuel cell is highly
recommended.
C. Racecars that use alcohol fuel
will be marked on each side with the capital letter “A” in a
conspicuous place and of a size sufficient to readily identify its
usage.
D. Snell SA95 or SA2000
helmets are required and must be worn by all competitors. Fire
retardant glove and shoes are mandatory, with fire retardant neck
braces and some form of head/neck
restraint device mandatory. Head, shoulder and leg containment
devices are Highly Recommended.
E. SFI approved full fire suits of
a flame retarding nature shall be worn by all competitors.
F. Five (5) point safety harness
system is required. Metal to metal buckles are required on
shoulder and seat belts. The shoulder and seat belts shall be
mounted securely. Seat belts and shoulder harness shall be
inspected before use, and must be 2003 or newer.
G. A full size window net on driver
side is required (minimum 16 x 20). No string-type nets allowed.
Window net hardware to be mounted so latch is at the top of front
window.
H. Kill switch required within easy
reach of driver. This switch shall be clearly marked “ON & Off
with a minimum of 3/8 high letters.
I. Roll bar padding is required
in the driver compartment.
J. A door plate inside of driver’s
side door highly recommended.
4. TIRES AND WHEELS
A.
The Hoosier 970 is the Official Tire for the USA Modified Series
in 2007. It will be used at all races on the USA Schedule. No
softening or grooving of tires allowed. No recaps allowed. USA
officials reserve the right to durometer tires at any time.
Soaking of tires is strictly prohibited. Penalty…loss
of purse and points, five (5) race suspension, $1000 fine.
This rule applies to
all tires in the pits, on the car, in the trailer or hauler, all
tires!
B.
Tires can only be purchased at the track and must be
branded and marked by USA Officials.
C.
Racers will be allowed to purchase four (4) new tires at the first
two (2) USA events. At the remaining events racers will be limited
to no more than two (2) tires per event, unless
other wise noted.
D.
All new tires purchased must be run in hot laps. (No
stickers for qualifying.)
E.
New racers, that did not race at race 1 and 2, with no
branded tire inventory, can only purchase up to two (2) new
branded tires at the track and must buy two (2) used tires
from a racer. Racers may run four (4) used branded tires if he/she
so chooses.
F.
All new tires purchased at an event must be run at that
event. (No stock piling of tires)
G.
In the event of a cut or flat spotted tire USA Officials will rule
on re-placement.
H.
The intent of this Tire Rule is to save the racer excessive tire
expense. Tire management is the key to getting the most out of
this rule. Any racer caught undermining this rule will be
penalized by USA Officials. All decisions of the USA Officials are
final.
I.
Tires are $_____plus tax and mounted free on bare rims. All
dismounts are $5.00 each. Bare rims will be mounted
first…rims with take offs will be mounted last.
5. FRAMES
A.
Factory production
complete full 1960 or newer parallel American passenger car frames
only. Frames may be cut in rear only a point no further forward
than 36” from center of rear end housing. No 2002 and up Ford
Crown Vic, Mercury Marque, Maruader, or Lincoln Town Car frames.
Reproduction
68-72 Chevelle Frames are legal.
B.
Frames may not be
widened or narrowed and must be able to support roll cage on both
sides. Some “minor modification” to the left frame rail (notching
for seat clearance & foot clearance), will be allowed, But major
removal of material, bending or folding of material or relocation
of these section (OEM location only) will not be allowed. Driver
must set inside OEM frame. Frame stiffener may be welded directly
to outside of left frame rail only. Frame members
must also remain uncovered so technical inspections can be
accomplished. Front cross member may be notched for radiator
clearance and/or steering clearance only. Minimum frame and body
height from ground is 4” (exception is front cross member).
C.
Front suspension and
steering must be steel, unaltered, approved OEM, and be in stock
location. Drag link may be OEM, or OEM after-market type. Parts
must be replaceable by stock part from same type suspension. Heim
joints and steel tube sleeves allowed. Stock passenger car
spindles only, no fabricated spindles, No made for racing
spindles. Bottom A-frame cannot be altered or moved. Front sway
bar must be OEM, or OEM type. No offset Lower A-Bushings,
aluminum knuckles, or steering shaft.
D.
NO
Fabricated re-placement lower a frames!
E. Tube
type upper A-frame allowed and can be moved. Cross shaft may be
aluminum. All ball joints OEM Type.
F. 5”
steel or aluminum coil-over shock kits allowed on rear
only. Must use 5” diameter spring.
G.
No Jeep, Bronco, etc. or
4-wheel drive frames allowed. No front wheel drive allowed. No
sports car frames allowed.
H.
Rear frame may be
altered to accept leaf or coil springs; any coil spring must be at
least 4.5” outside diameter. No fiberglass carbon fiber springs
allowed. No torsion bars allowed in rear.
I. No
hydraulic, ratchet, or electric weight jacks any where in or on
car.
J. One
steel shock per wheel only. Must be steel body, and with no
external canisters.
K.
Minimum wheelbase, 108”
both sides. Maximum overall width (front or rear) shall
not exceed 78” tread to tread. No tube type front
clips allowed, and no aluminum or fiberglass suspension parts.
L.
Drive shaft loop is
required and shall be constructed of at least ¼” x 2” steel
material (or material of equivalent strength). Loop shall be
mounted no more than 6” back from front of drive shaft. Drive
shaft shall be constructed of steel & painted white (no aluminum
shafts allowed). No drive shafts smaller than
2.5”diameter.
7. BODIES
A. 1970 or newer American
passenger car only (no panel van or station wagons). Stock
appearing front windshield supports (A pillars) and rear
window support units (B pillars) (painted roll bars not
acceptable substitute). No Full
front windshields or back glass. All cars will
be required to run full nose and lower nose! Competitors are to
reserve the front 24” of each door and the first 6” of the roof
for series sponsors decals.
Failure to do so will result in loss of percentage
of purse.
B. Firewall and floorboards are
mandatory. All body parts should recognizable as factory
production vehicle. Fiberglass or metal duplicates of body parts
are permitted. Original roofline shall be maintained and must be
full size fiberglass roof (No carbon-fiber etc). Handmade body
parts may be constructed of steel, aluminum, or fiberglass, but
should be recognizable as factory production vehicle. All cars
must have complete paint job. No
plastic body parts allowed.
Nose section shall not extend farther forward than front face or
lower bumper bar and shall remain within 4” ground clearance rule.
The top of the interior must be flush with the top of the door and
quarter panels. Quarter panels and B/C pillars must be two
distinct pieces. Sail panels can not be attached to spoiler. An
optional escape hatch right side may be used, by bringing the
metal from top of right door to drivers compartment no higher than
12” from the floor pan.
C. All numbers shall be in
contrasting color from body, affixed to both side doors and
top, be at least 4” thick and 20” high, and be readable
from the passenger side of car. Letters added in conjunction with
numbers, shall meet above criteria, and be at least 5” thick and
10”minimum height. A 6” number shall be placed on nose and tail to
help line cars up! No duplicate numbers.
D. Body must be same width, front to
rear and parallel to frame. Competitors shall position USA
Modified Sponsorship decals on both sides of car. Other
sponsorship decals neatly lettered.
E. No wings, vanes, spoilers or any
other type of ground effects allowed anywhere outside, inside or
under car. No vanes on noses, roofs, quarters, and doors. Rear
deck spoiler 4” (face) high and 45 degree angled to
the rear deck. All supports for the spoiler must be from the rear,
no vanes, cables, or supports of any kind to the front. Spoiler
height may be adjusted by USA officials, after initial race(s) to
enhance racing and improve competition. A strengthening top bend
that shall not exceed ½” in width, shall always face to the rear.
A spoiler shall also conform to dimension “I” of body rules, 66”
maximum width and 53” minimum.
F. Engine compartment shall remain
open, no side panels; sides may have maximum 6” drop and must be
enclosed at rear of hood; maximum hood scoop height 6”, bodies
shall extend no father forward than rear of block. Rear of Bodies
to be solid panel at least 8” high and 90 degrees to the ground
and flush with rear quarters.
No panel in front of right door to engine compartment, and no
inner panels.
G. Driver and passenger side windows
must have at least 12” of vertical opening to enhance drivers exit
from vehicle. Driver window safety net is mandatory. Lexan or
aluminum cowl panel in front of driver can be no wider than
cockpit and no farther back than driver.
H. Three vertical safety bars
constructed of ¼” (minimum) steel stock located not more than 3”
apart, shall be centered in windshield area in front of driver,
and welded to roll cage.
8. ROLL CAGES AND BUMPERS
A. Must consist of continuous hoops not less than
1.666” outside diameter and must have a wall thickness of at least
.095.
B. Must be frame mounted in at
least six (6) places. Roll bar padding required in driver
compartment (fire retardant roll bar padding highly recommended)
C. Must consist of configuration of
front and rear hoops connected by tubing on the sides or side
hoops. Driver’s head shall not protrude above the roll cage with
helmet on and strapped in seat. Roll cage shall be securely
supported and braced, and have a minimum of one cross bar in top
halo or roll cage.
D. Low carbon mild steel tubing in
recommended. To brazing or soldering allowed.
E. Protection of feet is mandatory,
with bar across back of engine with vertical bars and rub rails or
similar protection.
F. No brace bars forward of cage
may be higher than stock hood height.
G. A minimum of 4 driver side door
bars shall be as parallel with the ground as possible and located
perpendicular to the driver so as to provide maximum protection
for driver, but without causing undue difficulty in entering and
exiting racecar. The side bars must be welded to the front and
rear of the roll cage members. No brazing or soldering allowed.
Door plate inside driver’s side door highly recommended.
H. Bumpers shall be used both
front and rear. Front bumper shall be mounted frame-end to
frame-end with bottom loop parallel to ground. Bumpers should be
made of minimum 1.25” tubing and shall be able to support car if
lifted by a wrecker. The front edge of the front bumper shall not
be located more than 2.5” to the rear of the front face of the
lower hoop. The front bumper and
nose shall not extend forward of a line
32” from center of tire
and a maximum
width of 38”. Nose shall NOT extend past front bumper.
I. Rear bumpers, nerf bars and
bodies shall not extend beyond width of rear tires, and must not
contain any sharp edges. Left rear tire must be visible from
front, top, and rear.
J. Rear bumpers may be
constructed of tubing or flat stock and must protect fuel cell.
Center of bumper (front & rear) must be 18” +/- 2” from ground.
Rear bumpers not more than 2” wider than body on each side.
Aluminum “I” beam type bumpers are legal on rear only,
and must have no sharp edges.
Rear quarter panels shall not extend
farther back than 45” center of rear to quarter and maintain a
minimum of 8” ground clearance.
9. ENGINES
A.
All engines used in competition must be able to be used in
conventional passenger car without alterations. No machine work
on outside engine. No aluminum engine blocks.
B.
No total or partial dry sump systems allowed.
C.
Cooling system may be modified; glycol antifreeze shall not be
used. Radiators and oil coolers shall not protrude above
interior, outside body.
D.
One 2 or 4 barrel carburetor may be used, and must be naturally
aspirated. No fuel injection, electric fuel pumps, or magnetos.
E.
All cars are required to run a muffler on each header/exhaust bank
sufficient to dampen exhaust noise to 100 decibels at 100 feet.
Mufflers must be mounted on the end of your exhaust system so they
can be checked. Exhaust must exit out left side or inside of body
to the rear of the racecar. No exhaust shall dump out the right
side of the racecar. No spec muffler is required, however the
Schoenfeld # 112535 is recommended as it has proven to fall within
the decibel parameters.
F.
Any American make engine may be used as long as rear of engine
(bell housing flange) is mounted at least 72” forward from the
centerline of rear axle. Engine offset must be kept within 2” of
center-line of front cross member. Engine height minimum will be
11” from ground to front of center of crankshaft.
10. TRANSMISSIONS
A.
OEM production type transmission shall be allowed; 3 speed, 4
speed, automatic. No 5 speed transmission or “in-out” boxes. All
units must be clutch operated with clutch inside of bell housing
(quick change transmissions optional). Bert, Brinn, Falcon type
transmissions are optional. In the case of Bert, Brinn, Falcon
type transmissions it is understood that the clutch is inside the
trans-mission housing.
B.
Transmissions must have at least one gear forward and one gear
reverse, plus a neutral position and be able to be shifted by
driver.
C.
Clutch type transmissions must be equipped with steel or aluminum
blow-proof bell housing. Automatic transmissions must have an
approved scatter shield or blanket. May be constructed of ¼” x 4”
steel 270 degrees around flex plate or flywheel. Automatic
transmissions must remain in OEM stock appearing automatic case,
with original bell housing.
11. REARENDS
A. Any
passenger car type or truck rear end may be used; no aluminum
allowed; except lowering blocks; axle cap; and one piece drive
flange only. Must be full floating type with double spline axles.
B. Conventional
aluminum center section type quick changes, with closed steel
tubes, no inboard brakes or cambered rear ends, one piece drive
flange only, are allowed.
12. OVERALL
A. USA reserves the
right to change, modify, add or delete to this set of rules as
they deem necessary to ensure fair, competitive, and affordable
racing.
B. USA reserves the
right to confiscate any part or parts deemed by the USA officials
to be outside the rules. This includes tires, or any other part(s)
of any race car at any event.
C. E.I.R.I. All
decisions of USA Officials are final period. NO EXCEPTIONS!!! All
decisions are final and binding with NO EXCEPTIONS. Any changes
or clarification of these rules will be published on
WWW.USAMODIFIEDS.COM
D.
All
Rights Refused. These rules are not copy-righted in any form. Feel
free to copy and use in any way, shape, or form. Let’s try to keep
asphalt modified racing affordable and on the same rules as
possible!
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