2021 Southeastern Modified Series Rules
Competitors / Participants
THE INTENT OF THE SOUTHEASTERN
MODIFIED SERIES IS TO MAKE RACING FUN AGAIN. THE
RULES THAT FOLLOW WERE THOUGHT UP WITH YOU THE RACER
IN MIND. THIS IS A SERIES OWNED BY A RACER, TECHED
BY A RACER AND OFFICIATED OVER BY RACERS. EVERYONE
INVOLVED HAS DEEP RACING ROOTS. WE HAVE ALL BEEN
WORN OUT BY TOO MUCH TECHNOLOGY, SKYROCKETING TIRE
COSTS AND THE NEED FOR FULL TIME CREW MEMBERS JUST
TO BE COMPETITIVE. OUR GOAL IS TO GET TOGETHER 10 TO
14 TIMES A YEAR FOR FELLOWSHIP AND FUN AND GOOD
CLEAN HARD RACING. I GOT MAD ONE TIME AT A
RACETRACK; CLINT SMITH CAME OVER TO ME AND SAID WHY
YOU GETTING MAD, THIS IS SUPPOSED TO BE A GATHERING;
WE COME HERE TO ENJOY EACH OTHER AND THE SPORT WE
LOVE! THAT WAS THE BEST ADVICE ANYONE EVER GAVE ME
AT A RACETRACK. SO ON BEHALF OF MYSELF AND MY TEAM
COME HANG OUT WITH US AT THE RACETRACK AND OUR GOAL
IS TO PROVIDE YOU A GATHERING YOU WILL BE PROUD TO
HAVE BEEN PART OF.
Under the guideline of the
2021 SEMS Modified rules any and/or rules and as
stated in the 2021 SEMS Rule Book, all SEMS rules
applies to all except in instances where any local
track rules, pertaining to any item are listed in
the local track rules, whether that is in the
technical components and/or the racing procedures
and/or overall rules that are administered by the
local track officials and management. In those
instances, and where applicable, the local track
rules shall prevail.
The following are the 2021 SEMS
Modified rules. Under the guideline of the 2021 SEMS
Modified rules any and/or rules and as stated in the
2021 SEMS Rule
Book, all SEMS rules apply. The specifications
published shall be considered a section of the
“Official Rules and Specifications” for all
events, series and sanctions by SEMS. All sections
should be considered when determining specifications
ANY CAR, TEAM AND/OR DRIVER THAT DOES NOT MEET THESE
EQUIPMENT REQUIREMENTS WILL BE SUBJECT TO PENALTIES
AS DETERMINED BY THE SEMS.
CRATE 602 MOTORS ONLY ALLOWED
1) Motors do not have to sealed, but must remain
factor by the yellow book. Please understand there
will be very little grey area here. If the motor is
found to be cheated within the bolts you will
surrender your motor, your entry fees, and your
membership fees. You will be banned from competing
with the SEMS for 365 days and you will pay a fine
based on the infraction. Fines no less than $2,500.
Remember this series is based on fun don't ruin it.
-GENERAL MOTOR RULES
Alteration to the cooling system will be permitted.
If alterations to the cooling system are made the
stock appearing hood line must be maintained.
Radiator must be in front of the motor.
battery must be securely mounted and shielded. The
battery must not be mounted inside the driver’s
exhaust system(s) must be mounted with the exhaust
directed away from the vehicle and away from the
ground. The exhaust system(s) must remain completely
below the interior deck of the car. The entire
exhaust system (including the exhaust pipe and/or
header exits) must be inside all parts of the body.
The only breach of any interior or exterior body
panel that will be permitted is for routing the left
side header or exhaust pipe on the left side of the
car. When routing the left side header or exhaust
pipe through the left side firewall a maximum of
1/2” inch clearance around the header or exhaust
pipe will be permitted.
track rules will prevail when decibel and/or muffler
Power steering and Fuel Pump may be ran off the back
of the motor.
The SEMS have a $600
Dyno Fee in place. Your 602 Motor will go to Byron
Koury and be put on a Dyno. As long as it falls
within the correct specifications HP and Torque
there are No issues. If however it does not, the
owner of the motor will have the option of tearing
it down to prove legality. Any motor found to have
been cheated and this includes valve springs will
become the property of Southeastern Modified Series.
All points and Monies will be forfeited and a
Lifetime ban will begin immediately.
-TRANSMISSION AND DRIVELINE
drive shaft must be made from magnetic steel or
approved carbon fiber. Fiberglass driveshafts will
not be permitted. The driveshaft must be painted
white with the car number clearly labeled on the
1/2”-inch x 2”-inch 18-gauge steel drive shaft hoop
is mandatory. The drive shaft hoop must be at least
six (6”) inches behind the universal-joint. Two
hoops are strongly recommended. A single 1/8”-inch
plate on the right side of the drive shaft tunnel is
competitors are encouraged to perform systematic
checks on their drive-train.
drives and/or any type devices will not be
transmission must be bolted to the engine. All cars
must have forward and working reverse gears and be
able to shift to forward or reverse with engine
running. BERT-type transmissions will be permitted.
Clutch-type transmissions must be equipped with
explosion-proof steel bell housing. In lieu of an
explosion-proof bell housing or if one is not
available for your engine, a shield of at least 1/2”
inch x 6”-inches covering the clutch area 360
degrees securely fastened in place and fabricated
from magnetic steel will be permitted.
A. One 4 barrel carburetor. Willy's Equalizer OK. NO
superbowl system allowed. Carb claim rule $1,300.
Maximum 1" spacer. (Zero tolerance) may not intrude
into carb or intake. One gasket per surface max
factory production full 1965 or newer parallel
American passenger car frames will be permitted. The
frame must be complete in front of firewall. Cutting
of the frame in any way in front of firewall will
not be permitted.
frame must remain unaltered and must meet the
requirements of the attached drawing.
UNALTERED FACTORY FRAME.
Right-side frame rail may not be altered and/or
raised and/or moved from the stock OEM location in
any manner and must measure a maximum of six (6)
inches from the ground to the bottom or lowest edge
of the frame rail.
front cross member may be notched to allow clearance
for the radiator only. The cross members must be
plated to retain complete box configuration.
Bronco, 4-wheel drive, front wheel drive or sports
car frames will not be permitted.
minimum wheelbase permitted will be 108” inches. The
maximum wheelbase permitted will be 112”inches. No
tolerance - measurements are as posted.
Fiberglass lift bars and/or rear torsion bars will
not be permitted.
frame may not be widened or narrowed and must be
able to support the roll cage on both sides and must
be full and complete on both sides.
minimum frame and body height from ground is four
front bumper must be mounted to the ends of the
frame with the bottom loop parallel to the ground.
minimum of 1” diameter tubing and/or pipe is
required to for towing of the vehicle.
rear bumpers must be constructed of tubing and/or
flat stock. All rear bumpers and/or tubing utilized
in the fabrication of the rear bumper assembly must
have an end cap. The rear bumpers must protect the
bumper(s) (front and rear) when measure from their
center(s) must have a minimum of 25” inches of
ground clearance. There will be a two (2) inch
tolerance, plus or minus regarding this dimension.
The rear bumper and/or the nerf bars must not extend
beyond the width of rear tires. All bumpers must
have round edges. Sharp edges on any bumper and/or
bumper surface will not be permitted.
brace bars forward of the roll cage must not extend
higher than stock hood height.
rear push bars must not extend beyond six (6”)
inches of the rear quarter panel(s).
side bars and bumpers must be capped on ends.
maximum overall width of the car, front and/or rear,
shall not exceed 78” inches when measured from the
outside of the tire tread on both sides of the
vehicle. A maximum one (1”) inch spacer between the
hub and wheel will be permitted. Steel and/or
aluminum spacers will be permitted, provided the
overall tread width of the vehicle does not exceed
(602) 2500 lbs at all times.
added weight(s) must be painted white with the car
number clearly labeled on each weight.
added weight(s) must be securely mounted to car with
minimum of two (2) 1/2” inch bolts that pass
completely through each weight and the car. Weights
that are mounted on the rear bumper or outside the
body of the car will not be permitted. All added
weight must be mounted below all windows and the
interior sheet metal.
added weight(s) must be securely attached to the
frame below the body decking.
is defined as the steel welded structure only.
part that moves or is not a fixed component to the
steel frame structure may not be used for any weight
Weights attached to the rear bumper and/or outside
the frame will not be permitted.
car that loses any weight(s) during any event may be
fined up to $500.00.
minimum weight of car is with driver at ALL TIMES
including after the race.
weight determinations will be measured on the scales
selected by the local track officials and/or by SEMS
Officials for each racing event. Burn off and/or
weight percentages and/or tolerance after the
completion of any racing event will not be
cars will weigh as directed by announcement, radio
message or posted at the designated Scales, per the
weight rule, and track layout. All cars must weigh
in immediately following their races as directed.
Any detour, redirection or MUD PUDDLE MEANDERING,
may result in disqualification or penalty.
winner must weigh prior to any Winner’s Circle
Interview or Presentation.
detour to the scale, may result in loss of finish
position or time. Should any car stop on the way to
the Scales, and be touched by anyone other than a
Race Official, the Driver may be disqualified. Any
car not meeting the minimum weight, after the
designated event will lose its time, and or
finishing position from that event.
scales used for the event, provided by the series or
the track, will be considered the official scales
for the event.
will be available for any team to verify its car
weight and determine the scale weight.
Officials will allow a car to re-scale two times by
pulling off scale and pulling back on. Reading of
the third attempt will become the entered weight.
CELLS AND FUEL
cells must be used in accordance with the
manufacturers specifications. Alterations of any
kind will not be permitted (example: alterations to
top plate, alterations or removal of foam, etc.).
meet FT3 or SFI 28.3 requirements and/or Include:
components of an approved fuel cell are: a metal
container, bladder, foam baffling for slosh and
explosion suppression, flap valve and rollover vent
valve, threaded or snap lock cap.
valve plate, fuel pickup and fuel return fittings
must be on the top of the fuel cell.
fuel cell must be completely enclosed in an 18-gauge
magnetic steel container.
cells that are not contained within a welded steel
tubing "rack" must have two (2) equally spaced steel
straps that measure two (2) inches wide by 1/8 inch
in thickness that completely surround the fuel cell.
The straps must be bolted to the frame. Longitudinal
(front to rear) orientation is recommended for strap
maximum capacity for the fuel cell will be 22
fuel cells must be completely visible.
fuel cell must not extend lower than protective
ALCOHOL OR ANY FUEL THAT WHEN BURNING BURNS CLEAR.
OUR SERIES TECHMAN IS ALSO A RETIRED FIRE CAPTAIN SO
YOU WILL NOT GET AWAY WITH RUNNING ANY TYPE OF FUEL
WHICH OUR HOST TRACKS HAVE NO WAY TO PUT OUT. THIS
IS SIMPLY A SAFETY ISSUE.
Nitrous oxide, nitrous methane, propylene oxide or
any type of additives will not be permitted.
(See drawing diagram for reference - there may be
dimensions referenced in the drawing diagram
that are not referenced in the written rules and
vice versa. All dimensions whether written and/or
referenced in the drawing diagram dimensional are
bodies must follow dimension(s) and the appearance
as shown in diagram. The body shall be the
fabricated modified body from approved vendors. The
body must be symmetrical, including but not limited
to doors, nose, sail panels, spoiler supports, etc.
front windshield and rear window support must be
stock appearing. The front window support(s) may
have a clear Lexan support of no more than 16”
inches including the roof post at the bottom and
going straight to the roof. The support must be
securely fastened in a positive manner.
front roof post must be in a straight line from top
sides of the engine compartment must remain open.
Any side panels in the engine compartment area will
not be permitted. A five (5”) inch maximum drop of
the hood on either side of the hood will be
permitted and it must be enclosed at the rear of the
hood. The firewall on driver’s side must meet the
front of the door. The firewall must be a minimum of
16”-inches in length from top-to-bottom.
top of the doors must remain in line with the rear
engine plate. The bottom of the doors may extend a
maximum of eight (8”) inches past the motor plate
toward the front of the vehicle. Any material that
exceeds 8”-inches forward of the engine plate will
not be permitted.
panel from top of door to bottom of door may not be
no more than 3 inches and must be mounted straight
inside the bottom.
maximum one (1”) inch flange on the outside edges
(left and right side vertically) for the purpose of
strengthening only will be permitted on the front
nose only. Side fins and/or flanges of any kind
along the length of the entire car (hood, front,
and/or roof) will not be permitted.
maximum of one (1) stone deflector, mounted only on
the right side of the car, for rear mounted oil
pumps, oil filters, and for the main oil tank will
be permitted. The deflector may be made of steel,
aluminum, or heavy gauge wire. The cover may only be
mounted near the unit it and is designed to protect
with a maximum size of eighteen (18”x18”) inches
square and mounted only from the upper right frame
rail to the lower right frame rail.
minimum roof height is 42” inches with a maximum
height of 52” inches.
minimum deck height is 28” inches with a maximum
height of 39” inches.
cars must have a car number on both sides and the
roof that are at least 18” inches in height and 14”
inches in width.
driver’s last name must be displayed under the car
number in a legible font that is a minimum of
eight(8”) inch high letters.
minimum of two (2”) inches of tire clearance from
the body is required.
minimum ground clearance will be four (4”) inches.
measurement from center of the hub to the rear top
of deck will be a minimum of 34” inches and a
maximum of 48” inches.
maximum body width at the body’s widest part will be
72” inches. The minimum of width at the body’s
narrowest part will be 53” inches. The top of the
doors may have a maximum width of 67” inches. The
bottom of the doors may have a maximum width of 68”
inches. Q. On the left side, the rear of the door
may flare out six (6”) inches for tire clearance.
bottom of the flare must be curved and rounded not
pointed in any fashion.
maximum rear width of car must be 67” inches at the
maximum roof width will be 50” inches with a minimum
of 44” inches.
maximum roof length will be 56” inches with a
minimum roof length of 41” inches.
maximum height on rear roof post vertical is 3”
nose piece must not exceed 45”-inches in width,
centered between the frame rails and must not text
end past the leading edge of the front bumper. The
nose piece must have a minimum of six (6”) inches
from the ground to the bottom edge of the nose
MD3 D3 Modified Aero Valance is approved.
spoilers of any type, including but not limited to,
shaping of panels, shaping of interior body panels,
shaping and/or redirecting airflow with sail panels,
etc., will not be permitted.
AND DRIVER COMPARTMENT
windows must have a minimum 11”-inch vertical
opening. The entire interior must have a minimum of
11”-inches of clearance from the interior deck to
the roof and all sections of the roll cage. The
minimum window opening will be 12” inches. The
interior deck sheet metal to the right side of the
driver from the back of the seat forward should be
fabricated on an angle from the driveshaft tunnel to
the right-side window to promote ease of exit for
the driver through the right side and or front
master ignition switch within easy reach of the
driver is mandatory. The switch must be clearly
labeled “ON” and “OFF”.
Hydraulic and/or pneumatic weight jacks, trackers,
or similar adjustable components of any type will
not be permitted.
Mirrors of any type will not be permitted.
drivers compartment must be sealed from the engine
and the race track. The rear bubble of the hood
should be closed and sealed from the driver.
maximum slope/rake of the interior sheet metal
“shelf” front-to-rear is 4”-inches when measured
from the firewall to the top of the most rearward
part of the rear deck. A maximum of 2”-inches of
slope/rake will be permitted in front of the rear of
the seat to the firewall and a maximum of 2”-inches
of slope/rake will be permitted from the rear of the
seat to the top of the most rearward part of the
top of the interior must be flush with the top of
door and quarter panels. A one inch drop on the
inside will be permitted when measured laterally
from the top of the doors to the lowest part of the
car in competition must have right side door bars as
part of the roll cage. Please reference – B in
the roll cage section of the 2021 SEMS Modified Rule
Book. – Roof & Roof Supports (see drawing diagram
roofs must be full size. Half-moon roofs will not be
permitted. The rear edge of the roof may not be
mounted more than 12” (twelve inches) past the rear
axle. The roof must be symmetrical.
roof spoilers or ground effects of any kind will not
flat type roofs will be allowed a maximum 3”-inch
difference in height between the front of the roof
and the rear of the roof. This measurement may be
taken from the interior and/or the ground. The rear
of the roof must maintain the same height from side
curved type roofs will be allowed a maximum of
5”-inches in the front and 2”-inches in the rear.
The break in the roof must be within 6”-inches from
the center of the roof.
roofs will not be permitted.
roofs will not be permitted. Roofs must be rounded
side-to-side. Bead rolls will be permitted.
rear roof post must begin where it meets the back
edge of the roof. The rear roof supports may not
extend past the front side of rear upright of the
side vents on the front roof posts may extend
rearward from the lowest point, a maximum of
16”-inches, then at a 90-degree angle to roof for
one (1) configuration, side vents must meet the
outside of the car.
roof side (sail) panel window size must be
10”-inches x 15”-inches and must match drawing
number - 2- side view. There will be a tolerance of
2”-inches at the top and 3”-inches at the bottom. A
maximum crown of two (2) inches will be permitted,
measured from the center of a common tangent point
on either side of the crown. The roof side (sail)
panels must be symmetrical.
R. If the
long roof side (sail) panel is being used a 1”-inch
radius will be permitted.
sun shield must be on hinge for easy exiting, taping
will not be permitted. The window opening must
remain at a minimum of 12”-inches.
race cars in competition must meet the measurements
illustrated in the SEMS drawing.
There are only 4 (four) approved roof supports to
roof should be single thickness of material. The
roll bar hoops must be exposed for inspection.
the roof is curved then a level will be placed on
the top of the car and if the roof is 5”- inches or
less in the front and 2”-inches or less in the rear
and the break is in the middle then the roof will be
roofs must be stock appearing. The roof must
maintain the same height on both sides. If a SEMS
and/or local track official determines the roof does
not meet the requirements as stated above then a
penalty as determined by the official may be
determined prior to competition, additional weight
and/or other penalties, unless the roof can be
returned to within the parameter as stated above
prior to competition in the event that the roof was
-SUSPENSION / STEERING
Suspension/Steering designs and applications are
constantly evolving. Although the intent of the
suspension/steering rules are an attempt to
accommodate the majority of suspension/steering and
suspension/steering component designs and
applications currently being used in competition,
the rules cannot be absolute.
all new designs or modifications to an existing
component must be communicated to and approved by
SEMS Racing before being used in competition. Unless
otherwise specified, suspension/steering components
must be manufactured using magnetic steel only. This
includes but is not limited to, shocks, hubs, all
control arms (A-frames), axle tubes, tie rods, etc.
front suspension and steering components (except the
upper control arm mounts) must utilize the original
O.E.M. suspension and steering component mounting
holes. All mounting holes must remain a single round
hole as produced by the O.E.M. Adjustable mounts
and/or "slugs" will not be permitted.
jacking bolts (wedge bolts) may be added to O.E.M.
frame but, must be located within 1(one) inch of the
original centerline of the O.E.M. front spring
otherwise specified, the front suspension components
must be O.E.M. serviceable parts and originate from
the same O.E.M. frame manufacturer for that
otherwise approved, only O.E.M. and/or O.E.M.
replacement type passenger car spindles will be
permitted. Spindle O.E.M. manufacturer and model is
optional. Fabricated spindles will not be permitted.
Spindles must not be altered. O.E.M. spindles
utilizing a removable steering arm must use the same
O.E.M. steering arm originally supplied with the
type and model of spindle being use or a fabricated
steering arm that is an exact match (length,
mounting holes, etc.). If a fabricated steering arm
is used, competitors must be prepared to supply an
O.E.M steering arm for an inspection comparison.**
E. As of
01/01/2018 the following approved multiple piece
aftermarket spindles may be used for competition.
Speedway Motors: 91034313, 91034501/2, 91034511
manufacturing: RP-929 (AMC), Mustang II
Alterations and/or relocation of the lower control
arm mounts will not be permitted. Lower control arms
may be O.E.M. lower control arms for the frame being
used or SEMS approved fabricated lower control arms,
which are mounted in the O.E.M. location and
maintain the O.E.M. dimensions.Lower control arms
must be the same length when comparing to O.E.M.
right and left. The lower coil spring seat must be
an integral welded component of the lower control
arm. If using spherical rod ends (heim joints) as
lower control arm mounts, the spherical rod ends (heim
joints) must be welded to the lower control arm to
prevent adjustment. Competitors must be prepared to
supplyan O.E.M lower control arm for an inspection
comparison. All fabricated lower control arms must
fit the SEMS lower control arm fixture(s).
Tubular-type upper A-frames will be permitted. The
upper A-frame mounting locations may be relocated.
Aluminum cross shafts will be permitted.
O.E.M. steering system applicable to the O.E.M.
frame assembly must be used. The steering system
must consist of 1 (one) reciprocating steering gear
assembly, 1 (one) pitman arm, 1 (one) idler arm, 1
(one) center steering link (drag link), 2 (two)
inner tie rod ends or spherical rod ends, 2(two)
adjusting sleeves, and 2 (two) outer tie rod ends or
spherical rod ends. Additional components, braces,
rods, etc. will not be permitted.
or exact fit aftermarket replacement center steering
(drag) link, pitman arm, and idler arm available at
auto part replacement venues will be permitted.
Aftermarket components must match O.E.M. for all
specifications, dimensions and design. Only single
point round tapered mounting holes and O.E.M.
tapered ball studs will be permitted.
spherical rod ends (heim joints) and fabricated
magnetic steel tie rod adjusting sleeves will be
permitted. 5/8"or larger spherical rod ends and
fasteners must be used. The inner rod end must
connect to the center steering link using a stud
that is tapered to fit the center steering link on
one end with a straight 5/8"stud on the opposite
end, or the center steering link may be drilled to
accept a 5/8" bolt. The outer rod end may use a 5/8"
grade 8 bolt with a bump steer spacer to connect to
the steering arm. The O.E.M. steering arm may be
drilled to accept a 5/8" bolt.
steering shaft and interior mountings may be
fabricated. The steering wheel must remain on the
left side of the vehicle. The steering shaft must
have at least 1 (one) universal type joint to
allow shaft to "fold" under impact.
steering wheels must connect to the steering shaft
with an approved quick release coupler. SFI
certified steering wheel couplers are highly
suspension configuration used on current and new
chassis(s) must be the design commonly known as four
(4) link. Older cars currently competing with other
rear suspension designs will be allowed to compete
until further notification at the discretion of the
frame/roll cage structure must have integral welded
mounting brackets for the attachment of rear
suspension components. Frame suspension mounts may
be welded or bolted securely (without any movement)
to the frame/roll cage structure.
only material used to fabricate frame suspension
mounts that will be permitted is magnetic steel.
Aluminum birdcages will NOT be permitted.
housing mounts may be a solid (welded) type or a
floating type (birdcage) design.
one (1) axle housing mount per side will be
final assembled axle housing mount must be a one (1)
piece mount. When a floating type mount (birdcage)
is fabricated using two (2) pieces, the two (2)
pieces must create a common one(1) piece pivot
(barrel). The two (2) pieces must be fastened or
welded together to prevent independent movement of
the two (2) pieces. The axle housing mount must
attach directly to the axle tube with clearance only
to permit rotation of the entire mount. Fore, aft or
vertical movement of the mount or the axle housing
within the mount will not be permitted.
F. Only 2
(two) radius rods per side will be permitted to be
connected from the axle housing mounts (birdcages) to
the frame. Radius rods must be magnetic steel.
Spring rods or any type of radius rods that change
length dynamically are not permitted. (See Brakes
15.7.6D for floating caliper specifications)
Independent rear suspensions will not be permitted.
SOUTHEASTERN MODIFIED SERIES
- SPRING AND SHOCKS
(and only one) coil or leaf spring per wheel must be
used. Coil springs must be manufactured from
magnetic steel. Rear leaf springs (if used) may be
either magnetic steel or an approved composite
material. All coil springs must be a minimum of 5
(five) inches in diameter. Coil springs must be
wound with all coils being the same O.D., I.D. from
the top to the bottom of the spring. The coil spring
wire diameter must be the same from the top to the
bottom of the spring. Coil spacing must be equal.
Round coil spring wire must be used. Coil springs
with linear spring rates are the only coil springs
permitted. Air springs are not permitted.
top of the front coil spring must be closed end and
upper front coil spring mount must be flat and
support the top of the spring 360 degrees.
lower end of the front coil spring must be an open
end with a maximum gap of 1/4 inch between the "tail"
of the spring and the next coil.
lower front coil spring mount may have a single step
to prevent spring rotation and accommodate the open
end of the spring. The step of the lower front coil
spring mount must not exceed one (1) inch in height.
The lower coil spring mount must be a welded
integral component of the lower control arm. When
installed the lower end of the front coil spring
must be supported 360 degrees.
top and bottom of the rear coil spring must be
closed end and ground flat.
upper and lower rear coil spring mounts must support
the spring for 360 degrees.
steel coil-over eliminators and/or steel/aluminum
coil-over kits will be permitted. The coil-over
eliminators and/or coil-over kits must conform to
the shock and spring rules.
one coil spring per wheel will be permitted.
rear springs must have a tethered and/or cable
system in place to securely fasten them in position
in the car.
steel, symmetrical shock from top to bottom. Non
adjustable. May have maximum 1" cap. No bulb shocks.
$150 claim. NO bump stops (internal or external)
shock must fully compress and extend at all times.
NO packers or shims.
over shocks of any type on the front of the car will
not be permitted.
one shock per wheel will be permitted. Lay down
shocks less than 12” (twelve inches) away from brake
rotor will not be permitted.
HOUSING AND DIFFERENTIAL
axle housing must be of the “closed tube” design
utilizing “full floating” magnetic steel hubs and
axle shafts. “Live axle”-type rear ends will not be
change rear ends will be permitted.
center section of the axle housing must be
manufactured of either aluminum or magnesium.
tubes must be one (1) piece and manufactured of
magnetic steel only. Axle tube internal inserts or
external sleeves will not be permitted.
axle tube must not exceed (3) three inches O.D.
(outside diameter) at any point from center section
Aluminum spools will be permitted.
Any pull bar or lift bar
permitted. $250 claim.
cars must be equipped with a working braking system
on all four wheels and all four wheels must be able
to stop/brake at all times.
brakes must utilize a one piece O.E.M. or
aftermarket O.E.M., magnetic steel hub and vented
rotor assembly. Rear brakes must utilize magnetic
steel vented rotors. Carbon fiber, aluminum, and
solid disc rotors will not be permitted. Drilling,
lightening and/or any alteration to the brake rotors
or calipers will not be permitted. Brake rotors of
excessive size or weight when compared to an O.E.M.
brake rotor will not be permitted.
stock O.E.M. and/or SEMS approved aftermarket
calipers will be permitted. The following calipers
have been approved for competition:
Wilwood: P/N # 120-7197, 120-13900, 120-13899
b. AFCO: P/N
# 6630311 and 6630310.
calipers must mount solid to the front spindle. Rear
calipers may be a solid mount type or a floating
type design. Both solid and floating type rear
caliper mounts must be mounted to the rear axle
housing. When using a floating rear brake caliper,
it must be completely separate from the rear axle
housing (birdcage) mount. The floating rear caliper
mount must pivot independently and be supported by
one radius rod to the frame only.
proportioning (bias) valves and a right front shut
off valve are permitted.
tire rule may be amended by bulletin. NO PREPPING
only tire approved for SEMS competition is the Hoosier G60.
GROOVING allowed. NO PREPPING
D. NO SIPING ALLOWED. NO PREPPING
Recapping of an approved tire is not permitted.
local track and/or SEMS official can AND WILL confiscate any tire at any time and during any SEMS
event to be evaluated and analyzed including
verification using a tire durometer. Tires WILL also
be submitted for further chemical analysis. NO
Defacing or altering any of the manufacturer’s
identification markings, letters, words, numbers, on
any tire will not be permitted.
alteration of tires WILL result in immediate
suspension from all SEMS racetracks and/or events
and/or penalties deemed appropriate by local track
and/or SEMS. Tire softeners and/or chemicals
designed to alter the chemical characteristics of
the tire and/or the tire surface will not be
locks will be permitted on the right side only.
discs shall be fastened to the wheel using a minimum
of three (3)- 5/16 inch or (3) 1/4 inch diameter
magnetic steel hex head bolts.
use of wheel discs with any other type of fastener
will not be permitted.
L. As an
option, a wheel cover with minimum of (5) five steel
Zeus fasteners mounting points may be approved.
8-inch SEMS UMP IMCA approved and labeled racing
wheels will be permitted. Wheels must not weigh over
30 pounds INCLUDING TIRE!
wheels must be conventional one-piece magnetic steel
and must be mounted with lug nuts. Aluminum, plastic
and/or carbon fiber wheels will not be permitted. R.
All wheels must be fastened to the hub with five
STEEL lug nuts.
spacers are permitted. Wheel spacers may only be
manufactured from magnetic steel or aluminum.
Exotic, heavy metals are not permitted. Wheel
spacers must not exceed one (1) inch in thickness.
Wheel spacers must not exceed a 6-1/2 inch outside
Approved fastening (nut assembly) systems:
Manufacturing – Part #100 7-101.
Manufacturing – Part # WM377A-312 Aluminum 5/16 /
WM377S-312 Steel 5/16
X Chassis – Part # SC-WH-7810 (for a 1” spring) /
SC-WH-7820 (for a 1 3/8” spring)
Stop USA Part #:
Precision Products – Part # MC-516-18
-PERSONAL PROTECTION EQUIPMENT
Industry approved requirements in the Personal
Protection Equipment will begin to be introduced
into all divisions. When upgrading or purchasing new
please consider the future requirements.
cars must have a roll cage. The roll cage must be
approved prior to competition and it must be welded
to the frame. The driver’s head must not protrude
above the top of the roll cage with the driver’s
B. The top of the roll cage must
extend above the top of the driver’s helmet by a
minimum of one (1) inch. The entire roll cage and
all roll bar pieces must be fabricated from magnetic
steel a minimum of .095” in thickness.
driver and right-side door bars must be parallel to
the ground and located perpendicular to the driver. There must be right side door bars. The side
bars must be welded to the front and rear of the
roll cage. No brazing or soldering is permitted. The
door bars must have a minimum thickness of .095” and
must have a minimum of 1-1/2” diameter. On the
driver’s side, there will be a minimum of three (3)
protection is mandatory. One piece of magnetic steel
tubing, a minimum .095” in thickness, must be
fastened and/or welded across the back of the engine
with vertical tubing a minimum of .095” thick.
door side roll bars are mandatory and must extend
into the door panels.
roll cage must consist of continuous hoops that are
no less than 1-1/2” in diameter and must a minimum
thickness of .095”.
roll cage must be mounted securely (welded) to the
frame in a minimum of 6 (six) places.
roll cage must consist of a configuration of front
and rear hoops connected by tubing on the sides
and/or side hoops. Roll cage must be securely
supported and braced. Gussets to brace any portion
of the roll cage will be permitted.
A. Motor - $3,800 Claim
B. Carburetor - $1,300 Claim
C. Motor Dyno - $600 Claim
D. Pullbar - $250 Claim
E. Shock - $150 Claim
F. All claims must
finish on the lead lap and within 5 positions of the
car you are claiming.
electronic and/or computerized wheel spin and/or
acceleration retardation traction control devices
will not be permitted. Controlled timing devices
attached to or controlling accelerator or rotation
of wheel will not be permitted. GPS and/or any other
type of electronic tracking and/or locating device
will not be permitted.
traction control devices utilizing wheel sensors
and/or any means of measuring ground speed to
control wheel spin will not be permitted.
Adjustable ping control devices, dial a chip
controls, timing controls or automated throttle
controls will not be permitted in cockpit or driver
accessible areas. D.) Adjustable restrictor plates
will not be permitted.
remotely controlled components inside or outside the
cockpit of any competitor’s race car will not be permitted.
or devices for transmitting voice or data will not
be permitted, either in the race car or on anyone
connected with the car.
uses of pit boards or colored flashlights are
G. NO MIXING OF TIRES OR SHOCKS.
DECALS AND PATCHES
participants shall display required decals as
provided on decal verification sheet to be allowed
Decal on both side of the car is mandatory, Drivers
series patch mandatory to receive point fund
receive any contingency sponsorship awards, team
must meet the requirements of the award such
as; decals, patches, product use, product
For body diagram refer to UMP DIRTCAR Modified rule
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