Spring Creek Speedway

2012 Mod Lite Rules

Any car specifications not covered in these body specs are subject to TUSA
interpretation. Any significant performance advantage will be addressed on an
individual basis. TUSA reserves the right to determine what constitutes an unfair
a. 1928-1948 American-made production vehicles only, 5/8 scale, two-door
sedans, coupes, or pickup trucks. These are to be known as Classic
Modified body styles.
b. Modified appearing body style such as IMCA or DIRT modified. These
are to be known as Modified Lite body styles.
c. All chassis specifications are the same for both body styles

A. 42" min 50" max from ground - total car height. Body may be a
maximum of 44” from the bottom of the frame rail to the highest point
of roof of car.
B. 124" maximum total length, bumper to bumper.
a. 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.
a. 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 rear.
a. 40" min 48" max - length of roof panel. 36" min 42" max -
width of roof.
b. No part of roof panel may have more than 14o of angle rake.
c. No deflector of any type on upper sides or rear of roof panel.
d. Roof entrance hatch optional.
a. 20" min 38" max rear upper side panel may contain Plexiglas.
b. Side panels maybe no higher than 3" at the rear of the straight
line of quarter panel top edge.
c. 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.
a. 18" min side opening length. 10" minimum side opening height
front and rear.
a. 46" min 50" max - width of rear shelf and body panels.
b. Rear shelf may have no more than a 5o max rake and may not
be concave or convex in design.
c. No lips or spoilers of any kind.
d. The rear frame area from the rear shelf downward a minimum
of 16” must be completely enclosed the width of the frame.
e. Louvers allowed - no holes.
a. 36" min 56" max - length of right side pod area with max 30o.
Left side pod may be altered for driver access.
b. Rear quarter distance from center of rear 20" min 30" max.
c. 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.
d. Deck lid height from ground 30” minimum, 36” maximum
with NO rear lip extending upward.
e. Side pod may not extend rearward past the centerline of rear
f. Body must be centered on chassis.
g. If windshield is used, it must be flat.
h. All body dimensions will be teched + or – ½” unless otherwise
a. Must be constructed of aluminum or lexan material.
b. 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.
c. Maximum width of spoiler may not exceed 4”.
d. May be mounted at any angle but may not extend beyond or
above the rear quarter panel.
e. No bracing or supports on top, front, or back of spoiler blade
c. Track may have the OPTION of enforcing a rear gear rule.
d. (Ref. rule #15f) Suspension – Shocks may be “PRO SB Series Shocks”,
or “Bilstein S6G Series Shocks”.
e. (Ref. rule #15m) No torque absorbing devices.
f. All cars must run either TUSA 205, 215 or 235 tires on all corners.
g. May compete with Classic Modified or Mod Lite TUSA legal car in this

a. All cars following (a) TUSA “TUSA Stock Motor” program must weigh a
minimum of 1250 lbs, with driver after race.
b. All cars following (b) “TUSA Open Motor” program must weigh a
minimum of 1375 lbs, with driver after race.
c. All weight must be fastened to chassis in a secure manner using a
minimum of 3/8 bolt.
d. No weight outside of car body, i.e. on nerf bars
e. Hood will be clearly marked as the following:
1. STOCK 1250#
2. OPEN 1375#
f. This weight program will be monitored for parity and competitiveness and
may be changed at the discretion of TUSA.

a. Front:
1. maximum width 30"
2. Bumper height 6” to 8" with 2-bar loop.
3. Ground to top of bumper: 12” minimum, 16” maximum.
4. May not extend more than 12" forward of front tires.
b. Rear:
1. maximum width 56” with 3 vertical bars.
2. Bumper height 6” to 8" with 2-bar configuration.
3. Ground to top of bumper: 12” minimum, 18” maximum.
4. May not extend more than 8” behind rear body panels.
c. Bumpers must be hollow with max wall thickness of .125

a. Firewall must be metal and must completely separate engine compartment
from cockpit.
b. Engine protruding into cockpit must be enclosed.

a. Windshield must be Lexan, wire mesh, or protection bars. Lexan highly
recommended when running asphalt.
1. No Glass. All other cockpit areas must remain open.
b. Deflectors may be used in front of driver.
1. May be no wider than roll bar area.

a. Full length nerf bars between front and rear tires mandatory.
b. Maximum outside diameter of 1.25” and .125 maximum thickness. Must
be hollow.
c. May not extend out beyond tread width more than 1" at the rear only.

a. Seat must be high-backed aluminum, racing type.
b. All cars will have a permanent bar located behind top of seat at shoulder
c. Bottom of seat will not be more than 65" back measured from upper ball
d. Seat may be tilted back for added driver head clearance, however, no
portion of the seat may be back more than 74" as measured above.

a. Car number must be minimum 12" in height and 2" stroke.
b. Must be displayed on each door and roof or trunk.
c. Numbers in 4" size should be on front and rear of car to help with lineups.

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
mandatory at all TUSA Championship Cup events. 40-durometer
minimum before race for dirt and 50-durometer before the race for asphalt.
Clubs or special events may mandate tire selection.
c. Tires may not be altered from the original construction properties as per
rubber consistency or tire construction specifications
d. Tires may be grooved, sythed, and/or buffed.
e. Bead lock rims are optional.

There will be 2 weight divisions:
a. “STOCK” ENGINES - weight requirement 1250#
*1000 cc or less Water-cooled engines produced between 2000 and 2008 may compete in
this program
1. Must remain stock bore and stroke, no altering rod or piston
2. All head components must remain stock, (except cam sprockets
may be adjustable type). Cams must be as per original equipment
manufactured (OEM) and must meet specs as per manufacturer
and remain in original position.
3. Only OEM ECU type box with an additional fuel-monitoring
device that has NO OTHER CAPABILITIES are permitted.
i. No other modules or programs of any kind allowed.
ii. No fuel monitoring control devices allowed in drivers reach
or in cockpit area.
iii. Bizzaz systems or any other electronic control system that
has the ability to add modules that alters any program
except fuel monitoring is strictly prohibited.
4. Engine must retain its stock fuel induction system with no other
form of fuel delivery.
i. Fuel: Gasoline or grain based ethanol permitted.
5. Alternator recommended but not mandatory.
Engines eligible for this program, Suzuki GSXR 1000, Honda CBR1000RR,
Yamaha YZFR1, and Kawasaki ZX10. All other engine requirements apply from
section 11(c).
No interchanging, swapping or changing the specifications of any part with the
following exceptions:
1. Air Box – aftermarket air filter assemblies are allowable. No ram type are
2. Oil Pan: aftermarket or cut modification
2009 and newer engines are not eligible for competition but will be REVIEWED for
competition for the 2013-racing season with restriction of competing in the stock
division only.
b. “TUSA Open Motor” - weight requirement 1375#
1. Side draft motors 1250cc (+1%)
2. Down draft motors limited to 1200cc maximum with no variance.
3. ZX12
i. Must remain stock bore, stroke, rod length, and be stock
ii. Stock OEM fuel injection only with no aftermarket injectors or
additional fuel delivery systems.
iii. All head components must be OEM stock with the exception of
cam sprockets.
iv. Only one fuel-monitoring device, wired into the harness, with
no other connections, will be allowed during competition.
a. No fuel monitoring control devices allowed in the
drivers reach or driver cockpit area.
4. Water-cooled engines 1100cc and below can run carburetors or fuel
injection systems.
i. Engines above 1100cc OEM must remain in their original
stock configuration of carburetors or fuel injection.
5. Open engines may run gasoline, grain based ethanol, or alcohol.
i. No oxygenated fuels or nitro additives permitted.
ii. Stock OEM fuel injection only with no aftermarket injectors or
additional fuel delivery systems.
6. No engine can be modified to be less than original stock configuration
OEM specifications or be bored to more than 3mm over stock bore
7. Engine must be in production for a designated time period to
determine its competitive relationship with our current motor program.
Any major changes to existing engine by the manufacturer must be
reviewed by the board before approval.
8. Only OEM ECU type box with an additional fuel-monitoring device
that has NO OTHER CAPABILITIES are permitted.
i. No other modules or programs of any kind allowed.
ii. No fuel monitoring control devices allowed in drivers reach
or in cockpit area.
iii. Bizzaz systems or any other electronic control system that
has the ability to add modules that alters any program
except fuel monitoring is strictly prohibited.
9. Carburetors and cams optional. (Except ZX12)
10. Aftermarket cylinder & cylinder heads:
i. No aftermarket cylinder or cylinder heads allowed on watercooled
ii. No aftermarket cylinder heads allowed on oil & air-cooled
motors, aftermarket cylinders authorized.
11. Porting, grinding, polishing or changing stock configuration of intake
or exhaust ports allowed for oil & air cooled motors.
i. Carburetor/Fuel injection boot must fasten directly to head in
the stock intake port location.
ii. No porting, grinding, polishing or changing stock configuration
of intake or exhaust ports allowed on water-cooled motors.
a. Casting part lines must be visible upon inspection.
b. Intake port area may be altered to match intake boot.
c. Alteration not to exceed 3/8” into intake port.
d. Carburetor/Fuel injection boot must fasten directly to
head in the stock intake port location
12. Header must attach directly to head in stock exhaust port location
13. Oiling system may not include a dry sump system.
14. No increasing or decreasing of motor stock stroke in any way.
15. No 2009 engines or newer will be legal to compete in any division.
These engines will be reviewed and considered at a later date.
c. “General Motor” Specifications: All Divisions
1. Four cycle, four cylinders maximum only.
i. Must have working transmission, clutch, and starter with all
parts in place.
ii. Complete Clutch assembly must remain in engine.
iii. External reverse boxes allowed.
iv. No air controlled shifting devices.
2. Charging system optional.
i. Battery powered ignition system only.
ii. Alternator cover allowed.
3. No auxiliary starters.
4. Engines must be front mounted in engine compartment.
5. Engine setback:
i. The "square of the engine" (rear fins of the jugs) may not
extend rearward more than 17" from the center of front spindle.
ii. No part of the engine or transmission may extend rearward
more than 21 inches from center of front spindle.
6. No aftermarket fuel injection and no turbo system.
i. No nitro or nitrous oxide.
ii. OEM fuel injection must remain stock.
7. Engine must be cooled by original intent.
i. May use extra fan or oil cooler.
8. Engine exhaust must include muffler and exit rearward.
i. All muffler devices must include baffles. MUFFLER MUST
9. No form of traction control permitted
d. Engine Tech Procedures
1. Cylinder cranking compression- minimum 100p.s.i., Maximum 220
psi 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.

a. Battery and fuel pump must be mounted outside driver compartment.
1. Battery must be secure and held with non- rubber strap.
2. Electric fuel pump allowed.
b. Fuel cell mandatory, maximum 5 gallons, located in trunk area.
c. Reinforced or steel braided line must be used in all high-pressure areas.
d. A direct manual cutoff switch wired to ground circuit will be installed on
the right rear shelf or rear fire wall within 6” of the corner formed by the
rear deck and rear fire wall.
1. Switch will be located over the right shoulder of the driver.
2. The emergency electrical cut off switch will be clearly located and

a. Must use steel drive shaft from transmission to automotive rear end.
1. Minimum 2.50" x .083" or 2" x .120".
2. Suggested to be painted white.
b. Quick change rear ends allowed with steel tubes only.
c. Drive shaft tunnel must have minimum of 2 (3 recommended) 360-degree
hoops between firewall and seat back.
1. 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.

a. Main frame members will be minimum of 1" X 2" x .120" wall rectangular
steel tubing only.
1. Main frame rail consist of the length between the front lower a-arm
cross member and the rear main roll bar upright.
2. No aluminum 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.
1. Alternate material may be steel angle, min. .125" X 1.5" X 2".
Cross-bracing in floor under driver strongly recommended.
2. Rear frame rails at rear roll bar must be 34” max and 30” minimum
outside dimension.
3. Rear roll bar must meet same dimension as the frame it is mounted
to. Frame may taper forward of driver seat area.
4. 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.
1. Clubs may grandfather older cars with 1" x .065" tubing. Crossbrace
or diagonal strongly recommended in hoop over driver's
2. Roll cage may not be more than 44” from bottom of frame to top
of cage.
d. All cars must have cage bars installed across door openings on both sides.
1. Bars should be welded in place as part of roll cage. Driver door
only must be operational.
2. 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".
3. 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.
1. 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.
1. Any bars going from cowl area to snout must remain below the
upper line of hood.
h. Classic pickups may have two (2) bars going from upper rear roll cage
down to rear clip.

a. Front suspension must not extend rearward past the most forward panel of
the firewall.
1. Aluminum spindles are allowed for competition if the local club
deems them legal.
2. To be eligible for Regional or National events, driver must have a
copy of his local club rules at the time of registration.
3. Coil over shocks must be attached directly to the lower a-arm and
upper front chassis.
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:
i. One trailing rod must be attached to each side of the rear
housing by a bracket; either clamped or welded directly to
rear housing.
ii. No “birdcage” type mounting of any kind permitted.
iii. No linkages of any kind permitted. Third radius rod must
be mounted in a way to control the rotation of rear housing
iv. This rod may be adjustable but have no other function.
v. A torque-absorbing device may be used in this location.
vi. A lateral panhard or “J” bar will be used to maintain rearhousing
position in chassis of car.
vii. No Cantilever suspension in front or rear permitted
c. Wheel offsets are allowed.
d. Hub offsets are NOT allowed.
1. 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.
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 allowed.
m. The use of carbon fiber or titanium in any way is prohibited.

a. All steering components must have safety fasteners such as cotter pins or
self-locking nuts.
b. Manufactured quick-release steering wheel hubs mandatory.
c. Rack and pinion steering is mandatory.

a. All four wheels must have calipers, rotors and brake pads.
b. Rotors and calipers:
1. Steel rotors mandatory, .250 minimum thickness.
2. Steel OEM calipers or aluminum calipers allowed.
3. Cutting & scalloping of rotors will be allowed with no rotor
surface being less than 3/4” in width in the upper scalloped area.
4. Drilling of rotors is permitted.
c. Adjustable brake bias and wheel shut offs allowed.
d. Competition-type master cylinders allowed.

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, arm restraints and head & neck restraints HIGHLY

a. NO two-way radios. One-way communication from officials only is

a. NO mirrors allowed.

a. All drivers must be a minimum of twelve (12) years of age. All drivers
under 16 years of age MUST have a signed waiver by parent or guardian.
This rule will be governed by track regulations