Middle Tenn. Mod Lite/Southern Mod
Lite Racing Series Rules
As of January 28, 2013
Southern Mod Lite Racing Series shall hereafter be
referred to as SMLRS throughout the rules and
descriptions. Middle Tennessee Mod Lite shall be
referred to as MTML. The rules and/or regulations set
forth herein are designed to provide for the orderly
conduct of racing events and to establish minimum
acceptable requirements for such events.
These rules shall govern the
condition of all events, and by participating in these
events, all participants are deemed to have complied
with these rules. No expressed or implied warranty of
safety shall result from publications of or compliance
with these rules and/or regulations. They are intended
as a guide for the conduct of the sport and are in no
way a guarantee against injury or death to a
participant, spectator or official. By competing in
SMLRS/MTML sanctioned events, all participants agree to
abide by the rules that are listed below and agree to
the SMLRS/MTML official's decision or penalties set
forth by these rules.
The race director shall be
empowered to permit reasonable and appropriate deviation
from any of the specifications herein or impose any
further restrictions that in his opinion do not alter
the minimum acceptable requirements. No expressed or
implied warranty of safety shall result from such
alteration of specifications. Any interpretation or
deviation of these rules is left to the discretion of
the officials. Their decision is final.
1. SMLRS/MTML race rules shall apply to all SMLRS
2. All SMLRS/MTML vehicles are subject to inspection at
3. Approval of a SMLRS/MTML vehicle by the inspector
shall mean only that the vehicle is approved for
participation in a competitive event and shall not be
construed in any way to mean that the inspected
SMLRS/MTML vehicle is guaranteed mechanically sound. Be
it further declared that the inspector shall not be
liable, nor shall the sanctioning body, for any
mechanical failure not for any losses, injuries or death
resulting from same.
1. BODY STYLES
Any car specifications not covered in these body specs
are subject to SMLRS/MTML interpretation. Any
significant performance advantage will be addressed on
an individual basis. SMLRS/MTML reserves the right to
determine what constitutes an unfair advantage.
(a) Modified appearing body style
such as IMCA or DIRT modified. These are to be known as
2. BODY REQUIREMENTS AND
The intent of these preceding specifications is to
follow the bodyline and design of an exciting IMCA or
2a. MODIFIED LITE
(a) OVERALL DIMENSIONS
A. 42" min 50" max from ground - total car height.
B. 124" maximum total length, bumper to bumper.
C. SIDES AND REAR QUARTER PANEL
1. 84" max - Door and rear quarter length.
D. 30" min 38" max - side height of rear quarter panel
from the ground. 30" max height of quarter panel.
1. No wings, spoilers, etc allowed.
The hood should appear like an IMCA or DIRT modified.
2. 20" min 27" max - hood height excluding breather
protectors (bottom of frame rail to top of hood). Ram
air induction system prohibited. Rear of hood becomes
part of windshield area rules. No part of nose section
(in front of spindle centerline) may be wider than a
maximum of 24". Hood may taper out to door panels at the
F. ROOF PANEL
1. 40" min 48" max - length of roof panel. 36" min 42"
max - width of roof.
No part of roof panel may have more than 14-degree of
angle rake. No deflector of any type on upper sides or
rear of roof panel. Roof entrance hatch optional.
G. REAR UPPER QUARTER PANEL
1. 20" min 38" max rear upper side panel may contain
Plexiglas. Side panels maybe no higher than 3" at the
rear of the straight line of quarter panel top edge.
Side panel may be no higher than an imaginary line from
the rear edge of roof panel to 3" above the top edge of
the rear quarter panel.
H. SIDE WINDOW
1. 18" min side opening length. 10" minimum side opening
height front and rear.
1. 46" min 50" max - width of rear shelf and body
panels. Rear shelf may have no more than a 5-degree max
rake and may not be concave or convex in design. The
rear frame area from the rear shelf downward a minimum
of 16" must be completely enclosed the width of the
frame. Louvers allowed, no holes.
J. ADDITIONAL INTERIOR SPECIFICATIONS
1. 36" min 56" max - length of right side pod area with
max 30o. Left side pod may be altered for driver access.
2. Rear quarter distance from center of rear 20" min 30"
3. Cockpit cover with a max of ½" lip will be permitted
providing the on/off cutoff switch is reachable from
outside the car by safety personnel.
4. Deck lid height from ground 30" minimum, 36" maximum
with NO rear lip extending upward.
5. Side pod may not extend rearward past the centerline
of rear axle.
6. Body must be centered on chassis.
7. If windshield is used, it must be flat.
8. All body dimensions will be teched + or - ½" unless
K. REAR SPOILER
1. Must be constructed of aluminum or lexan material.
2. Must be single blade and mounted to the rear of the
interior body shelf and be no wider or higher than the
inside of rear quarter panels. 50" max.
3. Maximum width of spoiler may not exceed 4".
4. May be mounted at any angle but may not extend beyond
or above the rear quarter panel.
5. No bracing or supports on top, front, or back of
spoiler blade permitted.
L. CAR WIDTH
1. Maximum car width to be 60" measured to the outside
of the tires..
2. Maximum wheel base of 73" +/- 1".
3. Car must pass freely through a
hoop 60-1/2' wide and 50" high..
(a) Weight requirements shall adhere to the rules
outlined under rule #11 - engine specifications.
(b) No weight outside of car body, i.e. on nerf bars
(c) Hood or roof support will be clearly marked with
minimum weight as outlined in Engine Specification,
4. BUMPER DIMENSIONS
(a) Front maximum width 30", Bumper height 6" to 8" with
2-bar loop. Ground to top of bumper: 12" minimum, 16"
maximum. Bumper may not extend more than 12" forward of
(b) Rear maximum width 56" with 3 vertical bars. Bumper
height 6" to 8" with 2-bar configuration. Ground to top
of bumper: 12" minimum, 18" maximum. May not extend more
than 8" behind rear body panels. Additional push bumper
may be added above the rear bumper to avoid damage from
(c) Bumpers must be hollow with max wall thickness of
(a) Firewall must be metal and must completely separate
engine compartment from cockpit. Engine protruding into
cockpit must be enclosed.
(a) Windshield must be Lexan, wire mesh, or protection
bars. Lexan highly recommended when running asphalt. No
Glass. All other cockpit areas must remain open.
Deflectors may be used in front of driver. May be no
wider than roll bar area.
7. NERF BARS
(a) Full length nerf bars between front and rear tires
mandatory. Maximum outside diameter of 1.25" and .125
maximum thicknesses, must be hollow and may not extend
out beyond tread width more than 1" at the rear only.
(a) Seat must be high-backed aluminum, racing type. All
cars will have a permanent bar located behind top of
seat at shoulder level. Bottom of seat will not be more
than 63" back measured from upper ball joint. Seat may
be tilted back for added driver head clearance, however,
no portion of the seat may be back more than 70" as
9. NUMBERS AND GRAPHICS
(a) Car number must be minimum 12" in height and 2"
stroke. Must be displayed on each door and roof or
trunk. Numbers in 4" size should be on front and rear of
car to help with line-ups.
10. WHEELS AND TIRES
(a) Steel wheels only, minimum wall thickness .090", 13"
only, Wheel width max. 8".
(b) Hoosier Racing Tires plated UDRA, TUSA, TUSA-S or
TUSA-M: Hoosier RC1, RC3 or RC5: American Racer tires
will be allowed. 40 durometer minimum before race for
dirt and 50 durometer before the race for asphalt.
Maximum tread width of 8".
(c) Bead lock rims are optional.
(d) Tires may not be altered from the
original construction properties as per rubber
consistency or tire construction specifications. This
means no additives (internal or external) may be used on
(e) Tires may be grooved, sythed,
11. ENGINE SPECIFICATIONS
There will be 1 weight division:
1. "STOCK" ENGINES - weight requirement 1260# -
will be "Stock OEM" (no interchanging, swapping or
changing the specifications of any part).
a) Aftermarket oil pans permitted.
b) May run aftermarket air filters. Stock velocity
stacks are permitted. Aftermarket velocity stacks are
c) May run the Gipro S01 Motorcycle
* Engines eligible for this program, Suzuki GSXR
1000, Honda CBR1000RR, Yamaha YZFR1, and
No 2011 engines or newer will be legal to compete. These
engines will be reviewed and considered at a later date,
but will not be considered for competition prior to the
2015 season. Stock 1000cc water cooled engines produced
from 2000-2010 may compete. All engine components must
remain stock as per engine year. OEM electronic system
only with NO additions or modifications. Oil pans may be
altered. Air filters allowed as per rule 1.B section 11.
Racing gasoline is not permitted.
"General Motor" Specifications:
1. Four cycle, four cylinders maximum only. Must have
working transmission, clutch, and starter with all parts
in place. Complete Clutch assembly must remain in
engine. External reverse boxes allowed. No air
controlled shifting devices.
2. Charging system optional. Battery powered ignition
system only. Alternator cover allowed.
3. No auxiliary starters.
4. Engines must be front mounted in engine compartment.
5. Engine setback: The "square of the engine" (rear fins
of the jugs) may not extend rearward more than 17" from
the center of front spindle. No part of the engine or
transmission may extend rearward more than 21 inches
from center of front spindle.
6. No after market fuel injection, and no turbos. No
nitro, or nitrous oxide. OEM fuel injection must remain
7. Engine must be cooled by original intent. May use
extra fan or oil cooler.
8. Engine exhaust must include muffler and exit rearward
if required by local track. All muffler devices must
include baffles. MUFFLER MUST MEET LOCAL TRACK
REGULATIONS, (IF MANDATORY)
9. No form of traction control
Engine Tech Procedures:
1. Cylinder cranking compression- minimum 100p.s.i.,
Maximum 220 p.s.i. per cylinder average of 4 cylinders,
no variance, measured with a Snap-On compression gauge,
part number EEPV303A, with adapters EEPV304A, EEPV306A
or MT26J200, after ten (10) compression revolutions of
cranking, 15-45 minutes following feature event.
2. Carburetors or Fuel Injection and all 4 spark plugs
must be removed before checking compression.
12. BATTERY, FUEL SYSTEM
(a) Battery and fuel pump must be mounted outside driver
compartment. Battery must be secure and held with non-
rubber strap. Electric fuel pump allowed.
(b) Fuel cell mandatory, maximum 5 gallons, located in
(c) Pump gasoline only. NO RACING FUEL. 93.5 Octane
(d) Reinforced or steel braided line must be used in all
(e) A direct manual cutoff switch wired to ground
circuit will be installed on the right side of cockpit.
The emergency electrical cut off switch will be clearly
located and marked.
13. DRIVE TRAIN
(a) Must use steel drive shaft from transmission to
automotive rear end. Minimum 2.50" x .083" or 2" x
(b) Quick change rear ends allowed with steel tubes
(c) Drive shaft tunnel must have minimum of 2 (3
recommended) 360-degree hoops between firewall and seat
back. Must be fabricated of minimum .1875" X 1.5" steel
bar. 1" X .095" steel tube highly recommended.
(d) Rear must be locked or have a solid spool.
14. FRAME AND ROLL CAGE
(a) Main frame members will be minimum of 1" X 2" x
.120" wall rectangular steel tubing only. Mainframe rail
consist of the length between the front lower a-arm
cross member and the rear main roll bar upright. No
allowed in cage or frame.
(b) Main frames will have a minimum of 3 cross members
between firewall and back of seat fabricated of same
material as frame rails. Alternate material may be steel
angle, min. .125" X 1.5" X 2". Cross-bracing in floor
under driver strongly recommended. Rear frame rails at
rear roll bar must be 34" max and 30" minimum outside
dimension. Rear roll bar must meet same dimension as the
frame it is mounted to. Frame may taper forward of
driver seat area. Front engine area frame width must be
24: max and 20" min outside dimension. Left and right
frame rails must be the same + or - ½".
(c) Roll cage must be DOM steel minimum 1.25" x .083"
(.095 recommended) in all cars manufactured from 12/98
on. Clubs may grandfather older cars with 1" x .065"
tubing. Cross-brace or diagonal strongly recommended in
hoop over driver's head.
(d) All cars must have cage bars installed across door
openings on both sides. Bars should be welded in place
as part of roll cage. Minimum size 1" x .065". (1.25" x
.095" recommended) cars with bars mounted on doors
should have full doorframe and minimum of 2 horizontal
cross bars. Minimum 1" x .083". Cars with bats mounted
on doors must have 1/4" x 2" steel stops welded in on
each side of opening, totaling a minimum of 4" on each
end of door.
(e) It is required to have a steel bar with a minimum
size of 1" X .065" from doorpost to doorpost, under the
dash. Steel plate on driver's door bars recommended
(f) It is recommended that, if using rivets, body panels
attach to tabs welded onto cage instead of drilling
multiple holes into cage bars.
(g) No down tube frame cars allowed. Any bars going from
cowl area to snout must remain below the upper line of
(a) Front suspension must not extend rearward past the
most forward panel of the firewall.
(b) Rear trailing arm/radius rod specifications:
1. Arms may have a maximum length of 30".
2. Torque-absorbing devices are permitted.
3. Maximum 3 radius rods or 3 link suspension
(c) Wheel offsets are allowed.
(d) Hub offsets are NOT allowed. Hubs front and rear
must be within 1/2" distance from mainframe rail on
either side of car, measured from center of rotor to
vertical plane of frame rail.
(e) Coil-over shocks are the only allowable means of
supporting the chassis. One shock and spring per wheel
only. Shock and spring must remain as one unit.
(f) Shocks must be of all-steel construction,
non-adjustable type. May not be of a type that allows
disassembly. Retail price of the shock may not exceed
(g) No driver shall have the ability to adjust
suspension from inside car.
(h) Straight front axles are prohibited. Local clubs may
grandfather existing cars for competition.
(i) No leaf springs.
(j) No birdcage type rear linkage.
(k) Anti-roll (sway) bars permitted front or rear. Must
be connected without adjustments to arm location.
(l) No torsion bar suspension system of any type
(m) The use of carbon fiber or titanium in any way is
(a) All steering components must have safety fasteners
such as cotter pins or self-locking nuts.
(b) Manufactured quick-release steering wheel hubs
(c) Rack and pinion steering is mandatory.
(a) All four wheels must have calipers and rotors.
(b) Rotors and calipers:
1. Steel rotors mandatory, .250 minimum thickness.
2. Steel OEM calipers or aluminum calipers.
3. Cutting & scalloping of rotors will be allowed with
no rotor surface being less than 3/4" in width.
4. Drilling of rotors is permitted.
(c) Adjustable brake bias and wheel shut offs allowed.
(d) Competition-type master cylinders allowed.
18. SAFETY EQUIPMENT
(a) Fire bottle system HIGHLY recommended.
(b) Driver uniform will consist of:
1. Fire suit (single layer minimum, one or two-piece).
2. Fireproof gloves.
3. Fireproof shoes.
4. Approved helmet with Snell 95 or higher.
5. Full-face helmet.
6. Head and neck restraint systems recommended.
(c) Car must be equipped with 5-point safety harness, no
more than 3 years old, with minimum of 3-inch belts.
(d) Aluminum, high-backed racing seat mandatory.
(e) Window nets are required and arm restraints and head
& neck restraints are HIGHLY recommended.
(f) RACEceivers are required at all
SMLRS points races.
19. NO two-way radios or any other
means of driver communication permitted. One-way
communication from officials only is allowed. There is
to be NO signaling to drivers from crew members, fans
etc. period. Driver will automatically be disqualified
from any event if caught signaling.
20. NO mirrors allowed.
21. DRIVER QUALIFICATIONS
(a) All drivers must be minimum of fourteen (14) years
of age. All drivers under 16 years of age MUST have a
signed waiver by parent or guardian.
22. GENERAL REGULATIONS
(a) The rules and/or regulations set forth herein are
designed to provide for the orderly conduct of racing
events and to establish the minimum acceptable
requirements for such events. These rules shall govern
the condition of all events, and, by participating in
these events, all participants are deemed to have
accepted and complied with these rules. NO EXPRESSED OR
IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM PUBLICATION
OF OR COMPLIANCE WITH THESE RULES AND REGULATIONS. They
are intended solely as a guide for the conduct of the
sport and are in no way a guarantee against injury or
death to a participant, spectator, or official. Any
interpretation or deviation of these rules is left to
the discretion of SMLRS/MTML and the decision is final.
NO EXPRESSED OR IMPLIED WARRANTY
OF SAFETY SHALL RESULT FROM
SUCH DEVIATION OF SPECIFICATIONS.
(b) No intoxicating spirits or controlled substances are
to be consumed before or during race events by anyone
entering the pit area of tracks.
(c) SMLRS/MTML reserves the right to reject or allow
entry of any driver or car.
(d) Abuse or confrontation of any racetrack or
SMLRS/MTML official and/or use of abusive language is
FAILURE TO ABIDE BY THIS RULE MAY RESULT IN
SUSPENSION, LOSS OF POINTS, WINNINGS, RECORDS, AND/OR
(e) Any disputes involving qualifying times, lap
scoring, finishing position is under the jurisdiction of
the hosting track officials. SMLRS/MTML officials will
address winnings, points, or rules interpretations. Any
disputes or discussions of this nature are to be held
with SMLRS/MTML officials only.
(f) THE DRIVER ASSUMES RESPONSIBILITIES FOR THE
ACTIONS OF THEIR PIT CREW AND GUESTS.
(g) Drivers, owners, and/or crew shall have no claims or
actions of any kind against or cause of action for
damages of any kind, expenses, or otherwise against
SMLRS/MTML, any track owner, promoter, or official by
reason of disqualification or damage to either car,
driver, or both. This regulation shall be deemed a
covenant not to sue made by each driver, owner, and/or
crewmember to SMLRS/MTML, any track owner, promoter, or
official with respect to any alleged act or omission or
agreement by any of them.
(h) SMLRS/MTML or track officials at any time for
safety, mechanical, or rules compliance may inspect any
(i) ANY RULES OR REGULATIONS NOT COVERED IN THIS BOOKLET
WILL BE DETERMINED ON A TIMELY BASIS BY SMLRS/MTML AND
THE DECISION IS FINAL.
(j) Any violations for any SMLRS/MTML rules will result
in loss of points and monies for the event the violation
is discovered and violator cannot return until violation
is corrected. Any violations for SMLRS/MTML engine rules
may result in loss of all accumulated points for the
season and a one-year suspension for both owner and
driver of said vehicle.
(k) Effective date of these rules January 28, 2013.
MOTOR RACING IS A DANGEROUS SPORT AND MAY RESULT IN
HARM, OR DEATH.
Rules updated January 28, 2013