2021 THUNDER ROADSTER XTREME
REGULATIONS V1.1 NASA
2021 THUNDER ROADSTER XTREME REGULATIONS V1.1 NASA
Introduction……………………………………………………………….….………2
Sanctioning Body……………………………………………………….…………..2
Definitions and Application of the Regulations……………………….………….2
Classification…………………………………………………………….…………..3
Series Championship…………………………………………………….…………3
Rules Compliance…………………………………………………………………..4
General Rules……………………………………………………………………….4
Safety Equipment……………………………………………………….…………..5
Specifications………………………………………………………………………..7
Appendix A…………………………………………………………………………..11
Appendix B ………………………………………………………………………….12
Appendix C ………………………………………………………………………….13
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1. Introduction
1.1 These regulations govern Thunder Roadster Xtreme (TRX) Series racing events held
throughout North America.
1.2 The TRX Series is a competitive, fun, affordable racing series, focused on road racing with
limited modifications and specified required components. The series showcases the driver's
skills and the specified required components from manufacturers, distributors, and dealers. The
main goal of the TRX Series is to host events at the 17 most iconic road course venues in the
United States. See Appendix A.
1.3 Other than the modifications specifically allowed in these Rules, every part of the car
must remain as it came from the factory.
1.4 These regulations are ‘living’ and subject to changes at any time. The stability of these rules
allows for this provision as opposed to the typical annual rules update with wholesale changes
that occurs on a calendar year basis.
2. Sanctioning Body
The National Auto Sport Association (NASA) sanctions TRX Series competitions. All events are
governed by these Regulations, applicable addendums, as well as those found in the latest
version of the NASA Club Codes and Regulations (CCR). All decisions made by the series
administration are final, except under certain conditions, as specified by the CCR.
3. Definitions and Application of the Regulations
3.1 “Shall” is mandatory, "may not" is prohibitive, and “may” is permissive. If there is a conflict
between the Regulations and the CCR, these Regulations supersede the CCR. If an item is not
addressed in the Regulations then the item is controlled by the CCR.
3.2 If the Regulations do not specifically permit a modification, it may not be made.
3.3 "Original" and “stock” mean "as originally fitted for the chassis from Thunder Roadster
Ventures (TRV) or as originally fitted for the chassis from US Legends Cars International.”
3.4 "Substituted" means that original OEM equivalent items may be used.
3.5 "Replaced" means that the item may be replaced with items meeting or exceeding OEM
specifications.
3.6 "Modified" means that the item may be replaced, machined, welded, or removed.
3.7 The interpretation and application of the TRX Series Regulations by TRX or NASA officials is
final and binding. In order to promote the sport of automobile competition, to achieve prompt
finality in competition results, and in consideration of the numerous benefits to them, all
members, including competitors and officials, expressly agree that:
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3.7.1 Determinations by TRX or NASA officials shall not be subject to litigation, and they
may not initiate or maintain litigation of any kind against TRX or NASA or anyone acting
on behalf of TRX or NASA to reverse or modify such determinations, or seek to recover
damages or other relief allegedly incurred or required as a result of such determination.
3.7.2 If a driver, entrant, crew member, guest, or official initiates or maintains litigation in
violation of this provision, that person agrees to indemnify and reimburse TRX or NASA
for all costs of such litigation, including travel expenses, court costs, witness and filing
fees, and reasonable attorneys’ fees.
3.7.3 All drivers agree to abide by all applicable rules.
4. Classification
4.1 The TRX Series has one preparation level and class. In order to participate in any TRX
Series event, a TRX Series controlled stock programmed ECU (TRX Series ECU) must be
installed in the racer’s vehicle.
4.2 To participate in the TRX Series, a one-time $300 entrance fee is required to be paid to
TRV at least 2 weeks prior to a racer’s first event. The one-time entrance fee will be
used to purchase a TRX Series ECU for each racer in the TRX Series. Racers may also
provide TRV with a compatible stock Suzuki ECU to be programmed and wave the $300 fee.
4.3 TRX Series ECUs will be maintained and controlled by TRX Series directors, or individuals
designated by the TRX Series directors. TRX Series ECU can be swapped out at any time
during an event by a TRX Series official.
4.4 Prior to a racer’s first qualifying session of each event weekend, each racer shall provide
the TRX ECU from his/her vehicle to the TRX Series officials to validate the ECU program. This
can be done by removing the ECU from the vehicle or by providing the vehicle to the TRX
Series official to connect to the tuning pigtail (if installed). This process is required prior to any
official qualifying or race session. Immediately following each race drives will be required to
make their vehicle available for a TRX inspection to verify the proper ECU is connected in the
race car. Failure to do so will result in an automatic DQ for that event.
5. Series Championship
5.1 The series will count each racer’s best 10 of 16 finishes in any given season to count as the
total season points. Disqualifications cannot be dropped.
5.2 In the case of a tie, the season champion will be determined by the highest number of
placed finishes throughout the season, including all completed races by each competitor, if
necessary.
5.3 The series will not allow any races outside of those designated in Appendix B to count
toward the series championship.
5.4 A first place finish will be awarded 100 points. All other points will be awarded in decreasing
5 point increments until all racers have been awarded points.
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5.5 If a racer decides to switch cars or engine, for any reason between any Qualifying and Race
session the driver will automatically grid after the last TRX Series car.
6. Rules Compliance
6.1 Each competition vehicle shall conform to these published rules. Any competitor whose car
is not in compliance with these rules will not be allowed to compete in the TRX Series.
6.2 Any competition vehicle found to have illegal modifications, either by NASA or TRX Officials
at any time during a race event, is subject to penalties per CCR Rule 17.7.
7. General Rules
7.1 Competitive Format
7.1.1. The TRX Series Competitive Format regarding body contact conforms to CCR
Section 25 “On Course Conduct.”
7.2 Driver Eligibility
7.2.1. A driver shall possess a valid NASA Provisional or Competition License.
7.3 Eligible Vehicles
7.3.1. Only TRV or authorized dealer manufactured vehicles marketed as Thunder
Roadsters or Thunder Cars are eligible.
7.4 Vehicle Numbers, Class Identification, Decals
7.4.1 Each car shall display easily readable numbers on each side and the front (hood)
and rear of the vehicle, of significant size and color differentiation from the body color so
as to be clearly seen by timing and scoring officials. Side numbers shall be a minimum of
8 inches high with a 1-1/2 to 2 inch stroke. Hood and rear numbers shall be a minimum
of 5 inches tall.
7.4.2 TRX Series or NASA officials may require series and/or sponsor identification
(decals) in a specific size and/or location on each car. Decals must be displayed on cars
before being allowed to race.
7.4.3 NASA decals as specified in the CCR are required.
7.5 Appearance
7.5.1 Cars may be painted any color(s).
7.5.2 Cars shall be neat and clean, and shall not be dirty externally or in the engine or
passenger compartments.
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7.5.3 Graphics, removable or permanent (painted) are permitted and shall be tasteful.
7.5.4 All fiberglass components must remain within the stock dimensions as currently
delivered by TRV or US Legend Cars International and may not be intentionally
lightened in any way. Any mix of stock body components and wing maybe used, except
as provided below in section 7.5.5 Original holes in body cannot be covered. Holes for
airflow are only permitted in the front of the nose, two (2) maximum holes, in front of
body, behind the front bumper for front brake ducts. No other modifications to the body
are allowed except those that must be made to allow for approved suspension
modifications, and for side exhaust exit. No changes to the underside on the frame for
sealing or aerodynamics are permitted. A skid plate of no more than 12 inches wide
maybe mounted under the oil pan. All fiberglass body components must be firmly
attached to every Thunder Car competing in any race. It is recommended that all dzus
fasteners fit tight and are taped over to prevent loosening. Any Thunder Car may be
black flagged or denied entry to start a race if any of the aforementioned items are not
attached. Removal of undamaged fiberglass components (hood, deck lid, etc.) during
an event is not allowed.
7.5.5 The wing may not exceed the factory height of 26 inches above the chassis frame
as originally designed. Modified winglets may be used as long as they do not exceed
120 square inches. Brackets maybe installed to support a wing on the open wheeled
body. Wings mounted on open wheel bodies must be located behind the rear roll cage
of the driver’s compartment. Closed wheel bodies wing mounting points may not be
moved.
7.5.6 All cars must have bumpers front and rear. The bumpers must be at minimum the
size, thickness and diameter as provided by TRV or US Legends Cars International.
7.6 Fuel
7.6.1 Permitted fuel is unleaded pump gasoline, with a maximum octane of 93. Fuel
must be from a mass-marketed supplier, e.g. BP, Sunoco, Exxon, or other independent
mass marketer, e.g. track supplier or local independent gas station.
7.6.2 Fuel additives, other than those supplied in the fuels listed above, are prohibited.
7.7 In Car Adjustments
7.7.1 No car is permitted any cockpit adjustable system or component, except brake
bias.
7.8. Data Acquisition
7.8.1 Data acquisition devices are permitted but must not perform a secondary function.
8. Safety Equipment
8.1. Safety Requirements
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8.1.1 All vehicles and drivers shall conform to NASA’s Club Codes and Regulations
(CCR) that are in effect as of the date of the competition. If in conflict, these regulations
supersede the CCR.
8.2 Fire Systems
8.2.1 All cars without a fire system shall have a fire extinguisher complying with the CCR
securely mounted and within the driver's reach.
8.2.2 On board fire systems must comply with the CCR rules.
8.3 Roll Cages
8.3.1 All cars must utilize the factory rollover protection system. The system may not be
modified without written approval from NASA. In any case, all cars are required to
maintain the rollover protection structure to the most current standards, unless otherwise
specified in writing by NASA. Notation should be made in the car logbook indicating
NASA approval of the modifications. Metal Fatigue – It is highly recommended to have
the frame checked periodically by an expert for metal fatigue. Cracked or broken frames
are strictly prohibited from any NASA events.
8.4 Oil lines
8.4.1 All oil lines shall be properly secured.
8.5 Master Switch
8.5.1 The installation of an electrical master “cut-off” switch meeting CCR specifications
is required.
8.6 Catch tank
8.6.1 A catch tank oil breather is mandatory.
8.7 Engine Coolant (if applicable)
8.7.1 Use of an ethylene glycol (coolant) is prohibited unless specifically allowed without
Supplemental Regulations of a specific race event or by permission of the Regional
Director. Substitute coolants (e.g. “Water Wetter”) are highly encouraged for all
competitors.
8.8 Fuel Cells
8.8.1 Fuel cells must be stock as currently delivered by TRV or US Legend Cars
International or must be a FIA–FT3 approved fuel cell as per NASA CCR and must
remain in the stock location. Foam is mandatory in all approved fuel cells as delivered
by TRV or US Legend Cars International.
8.9 Safety Gear
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8.9.1 All drivers are required to utilize a closed-face helmet, with a certified shatter
resistant face-shield. This helmet must conform to all standards listed in the CCR. All
drivers must utilize arm restraints to help prevent injuries to the hands and arms in the
event of a rollover.
8.10 Cool Suits
8.10.1 Cool suits, helmet blowers, and associated equipment, properly secured, are
permitted, providing that none of the items serve any other purpose.
8.11 Battery
8.11.1 Only a lead acid, or gel cell battery of the same dimensions as stock (7 1/8 x 8 x 6
1/2) or Group Size 26 and 25lb. minimum weight may be used. A top post or side post
battery may be used. Motorcycle batteries may not be used. The battery must remain in
its stock location and securely mounted. The original stock battery bracket may not be
altered in any way. A battery box, terminal coverings or rubber padding around rear end
is also highly recommended. A battery shut-off switch is mandatory (see 8.5. Master
Switch).
8.12 Transponder Location
8.12.1 The transponder may not be located any further forward than the front firewall.
8.13 Front Firewall
8.13.1 A metal firewall is mandatory. The firewall must remain sealed as delivered by
TRV or US Legend Cars International. Using a “thicker than stock” metal firewall
separating the driver’s compartment and the engine compartment is permitted.
8.14 Roll Cage Safety Light
8.14.1 In an effort to make TRX Series cars more visible in mixed class racing, a LED
light with a minimum of 1500 Lumens mounted to the top of the roll cage is mandatory.
9. Specifications
9.1 General
9.1.1 All cars in this category shall compete as equipped by the manufacturer, except as
allowed by these regulations.
9.2 Weight
9.2.1 The minimum weight, with racer after any track session will be 1,725 lbs. The cars
may be weighed at any time during the event by NASA or TRX officials.
9.2.2 A car found to be underweight after a qualifying session shall start the following
race behind the last-place qualified TRX Series car, and only if the underweight car
meets the minimum weight requirement prior to the start of the race.
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9.2.3 A car found to be underweight after a race session shall be disqualified from the
race results and a notation should be made on the current event page of the car’s
logbook. The racer must ensure that the car is weighed at the next event, and shall
meet minimum weight requirements before being allowed to compete. Per CCR Rule
17.8, each competition vehicle will be given a five (5.0) pound leeway at that car’s first
official weigh of each race weekend.
9.3 Modifications
9.3.1 Engine
9.3.1.1 The TRX Series requires a (2008 or newer) Electronic Fuel Injected Gen
2 Suzuki Hayabusa 1340cc stock engine. All non performance modifications to the
Hayabusa engine to convert the engine to a proper TRX engine from the stock
motorcycle engine as it comes from TRV are considered stock. Any performance
modifications to the engine to alter the factory stock horsepower of the engine is
strictly prohibited by the series. However, the following parts of the engine
maybe substituted to increase reliability: clutch, valve springs, and rods.
9.3.1.2 Any type of after market engine tuning devices (i.e. Power Commander)
are prohibited in the TRX Series.
9.3.1.3 Dry sump systems are prohibited.
9.3.1.4 Oil coolers may be added or replaced, and their location within the
bodywork is unrestricted so long as they are not mounted within the driver/
passenger compartment.
9.3.2 Exhaust System
9.3.2.1 All TRX Series cars must meet track sound requirements, if applicable. Any type
muffler is acceptable providing that it serves no other purpose than to quiet the exhaust.
Increase in power is a side benefit and is acceptable providing the car is in compliance
with other sections of these rules.
9.3.3 Cooling Systems
9.3.3.1 Radiators
9.3.3.1.1 Any radiator may be used.
9.3.3.1.2 Electrically operated fans with manual or automatic actuation may be
added.
9.3.4 Suspension
9.3.4.1 Front aluminum spindles and steel spindles (and pickup points) must remain
stock, within the stock dimensions, steel thickness, location and configurations as
currently delivered by TRV or US Legend Cars International. Repairing a broken or
cracked aluminum spindle is not allowed. The lower control arm’s mounting points may
not be moved or changed in any way. The upper and lower ball joints must remain stock,
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within the stock dimensions, steel thickness, location and configurations as currently
delivered by TRV or US Legend Cars International and may not be reinforced in any
way. One or two (1/4” minimum 7/16” maximum) jam nuts are permitted on the upper
and lower ball joints. Each ball joint must use at least one jam nut. Maximum width as
measures at the widest part of the tire is no more 65 inches. Note: All radius rods (7.5”,
10”, 11”, 12”, 13”, 24”) length measurement will have a tolerance of +/- 1/8” (0.125”).
9.3.4.2 All shocks must be stock as available from TRV or US Legends Cars
International. Springs may be from other manufacturer but must fit shock without any
modification. Any combination of stock shocks and springs are allowed.
9.3.4.3 Rear suspension may be modified to use longer rear swing arms and rear shock
mounts may be moved to outside of frame. Any 3 point rear suspension is allowed.
Only one fixed pick-up point allowed per radius rod end. Trailing arm radius rods are to
be the same equal length. If using radius rod mounting plates, the plates will be marked
at the beginning of the season by the TRX Series directors and can only be replaced by
notification and approval of the TRX Series directors. Maximum length for radius rods
(trailing arms) is 24.” Trailing arms radius rods may be of aluminum or steel construction
with a minimum diameter of .840 & .750 respectfully. Third link must be of aluminum or
steel construction with a minimum diameter and must remain within the stock pick-up
point locations as delivered by TRV or US Legend Cars International. Panhard bar must
be of steel construction with a minimum diameter and must remain within the stock
mounting location as delivered by TRV or US Legend Cars International. Note: All radius
rods (7.5”, 10”, 11”, 12”, 13”, 22.5”) length measurement will have a tolerance of +/-
1/8” (0.125”).
9.3.4.4 Wheel Base can be no more than 96” measured center hub to center hub or
wheel lip to wheel lip during tech inspection.
9.3.4.5 Ride height must be no lower than 3” measured anywhere on the main frame
rails. Vehicle must meet weight requirements during this inspection process.
9.3.5 Rear Housing
9.3.5.1 Rear housing may be stock or a different may be used provided rear track
measured at the widest part of the tire does not exceed 65 inches. Any axle may be
used.
9.3.6 Rear Ends
9.3.6.1 Only 10 bolt pattern/wide flange (5/8”) Toyota, locked-steel rear ends are
permitted. The rear end must be locked (all spider gears welded or steel spool of a
minimum 6.0 pounds, 5.25 pounds for a 2:50 spool, as currently delivered through U.S.
Legend Cars International only). No limited slip differentials, quick change rear ends,
floaters; homemade or otherwise, hemispheric or similar type bearings are permitted.
9.3.7 Drive Shafts must be stock as delivered from TRV or US Legends Cars
International or the same dimensions, length, material, thickness and safety collar.
9.3.8 Tires and Wheels
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9.3.8.1 Tires must be Hoosier 26.5/8.0-15 Roadster Edition 880 or 26.5/8.0-15 880
Hoosiers. Wet weather tires may be American Racer USLCI 82/8.0-15 or Ohtsu FP6000
A/S 225/60R15 96H.
9.3.8.2 Wheels must be no more than 8 inches wide and 15 inches in diameter. The
minimum weight of a wheel and tire combination must be at least 33 lbs. without
additional steel, lead, or wheel weights. All wheel weights must be covered with duct
tape. Bleeder or relief valves are not permitted in the wheels.
9.3.9 Brakes
9.3.9.1 Any make and material of brake pads may be used.
9.3.9.2 Only steel rotors (not drilled, slotted or reduced in diameter) are permitted on the
front or rear. The minimum permitted thickness of the front brake rotor is 8mm (5/16)
wide; the rear rotor minimum thickness is ¼”. The minimum permitted diameter is 10
inches and the maximum is 12 inches.
9.3.9.3 Only stock or Wilwood 4-piston calipers model Forged Dynalite Lug or Narrow
Mount and Dynopro Lug or Narrow Mount may be used on front. For the rear brakes,
stock (stock includes the Wilwood rear, and drum as delivered by US Legend Cars
International) or Wilwood 4-piston Forged Dynalite Lug or Narrow Mount or Dynopro Lug
or Narrow Mount may be used..
9.3.9.4 Two master cylinders may be used one for front brakes and one for rear.
9.3.10 Ballast is permitted, and shall be securely mounted the frame, floor board or roll cage of
the car.
9.3.10.1 Ballast shall be in segments no heavier than fifty (50) pounds.
9.3.10.2 Each segment, or stack of segments, shall be fastened with a minimum of two
(2) one-half (1/2) inch diameter bolts and positive lock nuts of SAE grade 5 or better.
9.3.10.3 All ballast must be mounted within 2 feet of the center point of the driver’s seat.
9.3.11 Two-way radios may be used
Introduction……………………………………………………………….….………2
Sanctioning Body……………………………………………………….…………..2
Definitions and Application of the Regulations……………………….………….2
Classification…………………………………………………………….…………..3
Series Championship…………………………………………………….…………3
Rules Compliance…………………………………………………………………..4
General Rules……………………………………………………………………….4
Safety Equipment……………………………………………………….…………..5
Specifications………………………………………………………………………..7
Appendix A…………………………………………………………………………..11
Appendix B ………………………………………………………………………….12
Appendix C ………………………………………………………………………….13
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1. Introduction
1.1 These regulations govern Thunder Roadster Xtreme (TRX) Series racing events held
throughout North America.
1.2 The TRX Series is a competitive, fun, affordable racing series, focused on road racing with
limited modifications and specified required components. The series showcases the driver's
skills and the specified required components from manufacturers, distributors, and dealers. The
main goal of the TRX Series is to host events at the 17 most iconic road course venues in the
United States. See Appendix A.
1.3 Other than the modifications specifically allowed in these Rules, every part of the car
must remain as it came from the factory.
1.4 These regulations are ‘living’ and subject to changes at any time. The stability of these rules
allows for this provision as opposed to the typical annual rules update with wholesale changes
that occurs on a calendar year basis.
2. Sanctioning Body
The National Auto Sport Association (NASA) sanctions TRX Series competitions. All events are
governed by these Regulations, applicable addendums, as well as those found in the latest
version of the NASA Club Codes and Regulations (CCR). All decisions made by the series
administration are final, except under certain conditions, as specified by the CCR.
3. Definitions and Application of the Regulations
3.1 “Shall” is mandatory, "may not" is prohibitive, and “may” is permissive. If there is a conflict
between the Regulations and the CCR, these Regulations supersede the CCR. If an item is not
addressed in the Regulations then the item is controlled by the CCR.
3.2 If the Regulations do not specifically permit a modification, it may not be made.
3.3 "Original" and “stock” mean "as originally fitted for the chassis from Thunder Roadster
Ventures (TRV) or as originally fitted for the chassis from US Legends Cars International.”
3.4 "Substituted" means that original OEM equivalent items may be used.
3.5 "Replaced" means that the item may be replaced with items meeting or exceeding OEM
specifications.
3.6 "Modified" means that the item may be replaced, machined, welded, or removed.
3.7 The interpretation and application of the TRX Series Regulations by TRX or NASA officials is
final and binding. In order to promote the sport of automobile competition, to achieve prompt
finality in competition results, and in consideration of the numerous benefits to them, all
members, including competitors and officials, expressly agree that:
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3.7.1 Determinations by TRX or NASA officials shall not be subject to litigation, and they
may not initiate or maintain litigation of any kind against TRX or NASA or anyone acting
on behalf of TRX or NASA to reverse or modify such determinations, or seek to recover
damages or other relief allegedly incurred or required as a result of such determination.
3.7.2 If a driver, entrant, crew member, guest, or official initiates or maintains litigation in
violation of this provision, that person agrees to indemnify and reimburse TRX or NASA
for all costs of such litigation, including travel expenses, court costs, witness and filing
fees, and reasonable attorneys’ fees.
3.7.3 All drivers agree to abide by all applicable rules.
4. Classification
4.1 The TRX Series has one preparation level and class. In order to participate in any TRX
Series event, a TRX Series controlled stock programmed ECU (TRX Series ECU) must be
installed in the racer’s vehicle.
4.2 To participate in the TRX Series, a one-time $300 entrance fee is required to be paid to
TRV at least 2 weeks prior to a racer’s first event. The one-time entrance fee will be
used to purchase a TRX Series ECU for each racer in the TRX Series. Racers may also
provide TRV with a compatible stock Suzuki ECU to be programmed and wave the $300 fee.
4.3 TRX Series ECUs will be maintained and controlled by TRX Series directors, or individuals
designated by the TRX Series directors. TRX Series ECU can be swapped out at any time
during an event by a TRX Series official.
4.4 Prior to a racer’s first qualifying session of each event weekend, each racer shall provide
the TRX ECU from his/her vehicle to the TRX Series officials to validate the ECU program. This
can be done by removing the ECU from the vehicle or by providing the vehicle to the TRX
Series official to connect to the tuning pigtail (if installed). This process is required prior to any
official qualifying or race session. Immediately following each race drives will be required to
make their vehicle available for a TRX inspection to verify the proper ECU is connected in the
race car. Failure to do so will result in an automatic DQ for that event.
5. Series Championship
5.1 The series will count each racer’s best 10 of 16 finishes in any given season to count as the
total season points. Disqualifications cannot be dropped.
5.2 In the case of a tie, the season champion will be determined by the highest number of
placed finishes throughout the season, including all completed races by each competitor, if
necessary.
5.3 The series will not allow any races outside of those designated in Appendix B to count
toward the series championship.
5.4 A first place finish will be awarded 100 points. All other points will be awarded in decreasing
5 point increments until all racers have been awarded points.
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5.5 If a racer decides to switch cars or engine, for any reason between any Qualifying and Race
session the driver will automatically grid after the last TRX Series car.
6. Rules Compliance
6.1 Each competition vehicle shall conform to these published rules. Any competitor whose car
is not in compliance with these rules will not be allowed to compete in the TRX Series.
6.2 Any competition vehicle found to have illegal modifications, either by NASA or TRX Officials
at any time during a race event, is subject to penalties per CCR Rule 17.7.
7. General Rules
7.1 Competitive Format
7.1.1. The TRX Series Competitive Format regarding body contact conforms to CCR
Section 25 “On Course Conduct.”
7.2 Driver Eligibility
7.2.1. A driver shall possess a valid NASA Provisional or Competition License.
7.3 Eligible Vehicles
7.3.1. Only TRV or authorized dealer manufactured vehicles marketed as Thunder
Roadsters or Thunder Cars are eligible.
7.4 Vehicle Numbers, Class Identification, Decals
7.4.1 Each car shall display easily readable numbers on each side and the front (hood)
and rear of the vehicle, of significant size and color differentiation from the body color so
as to be clearly seen by timing and scoring officials. Side numbers shall be a minimum of
8 inches high with a 1-1/2 to 2 inch stroke. Hood and rear numbers shall be a minimum
of 5 inches tall.
7.4.2 TRX Series or NASA officials may require series and/or sponsor identification
(decals) in a specific size and/or location on each car. Decals must be displayed on cars
before being allowed to race.
7.4.3 NASA decals as specified in the CCR are required.
7.5 Appearance
7.5.1 Cars may be painted any color(s).
7.5.2 Cars shall be neat and clean, and shall not be dirty externally or in the engine or
passenger compartments.
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7.5.3 Graphics, removable or permanent (painted) are permitted and shall be tasteful.
7.5.4 All fiberglass components must remain within the stock dimensions as currently
delivered by TRV or US Legend Cars International and may not be intentionally
lightened in any way. Any mix of stock body components and wing maybe used, except
as provided below in section 7.5.5 Original holes in body cannot be covered. Holes for
airflow are only permitted in the front of the nose, two (2) maximum holes, in front of
body, behind the front bumper for front brake ducts. No other modifications to the body
are allowed except those that must be made to allow for approved suspension
modifications, and for side exhaust exit. No changes to the underside on the frame for
sealing or aerodynamics are permitted. A skid plate of no more than 12 inches wide
maybe mounted under the oil pan. All fiberglass body components must be firmly
attached to every Thunder Car competing in any race. It is recommended that all dzus
fasteners fit tight and are taped over to prevent loosening. Any Thunder Car may be
black flagged or denied entry to start a race if any of the aforementioned items are not
attached. Removal of undamaged fiberglass components (hood, deck lid, etc.) during
an event is not allowed.
7.5.5 The wing may not exceed the factory height of 26 inches above the chassis frame
as originally designed. Modified winglets may be used as long as they do not exceed
120 square inches. Brackets maybe installed to support a wing on the open wheeled
body. Wings mounted on open wheel bodies must be located behind the rear roll cage
of the driver’s compartment. Closed wheel bodies wing mounting points may not be
moved.
7.5.6 All cars must have bumpers front and rear. The bumpers must be at minimum the
size, thickness and diameter as provided by TRV or US Legends Cars International.
7.6 Fuel
7.6.1 Permitted fuel is unleaded pump gasoline, with a maximum octane of 93. Fuel
must be from a mass-marketed supplier, e.g. BP, Sunoco, Exxon, or other independent
mass marketer, e.g. track supplier or local independent gas station.
7.6.2 Fuel additives, other than those supplied in the fuels listed above, are prohibited.
7.7 In Car Adjustments
7.7.1 No car is permitted any cockpit adjustable system or component, except brake
bias.
7.8. Data Acquisition
7.8.1 Data acquisition devices are permitted but must not perform a secondary function.
8. Safety Equipment
8.1. Safety Requirements
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8.1.1 All vehicles and drivers shall conform to NASA’s Club Codes and Regulations
(CCR) that are in effect as of the date of the competition. If in conflict, these regulations
supersede the CCR.
8.2 Fire Systems
8.2.1 All cars without a fire system shall have a fire extinguisher complying with the CCR
securely mounted and within the driver's reach.
8.2.2 On board fire systems must comply with the CCR rules.
8.3 Roll Cages
8.3.1 All cars must utilize the factory rollover protection system. The system may not be
modified without written approval from NASA. In any case, all cars are required to
maintain the rollover protection structure to the most current standards, unless otherwise
specified in writing by NASA. Notation should be made in the car logbook indicating
NASA approval of the modifications. Metal Fatigue – It is highly recommended to have
the frame checked periodically by an expert for metal fatigue. Cracked or broken frames
are strictly prohibited from any NASA events.
8.4 Oil lines
8.4.1 All oil lines shall be properly secured.
8.5 Master Switch
8.5.1 The installation of an electrical master “cut-off” switch meeting CCR specifications
is required.
8.6 Catch tank
8.6.1 A catch tank oil breather is mandatory.
8.7 Engine Coolant (if applicable)
8.7.1 Use of an ethylene glycol (coolant) is prohibited unless specifically allowed without
Supplemental Regulations of a specific race event or by permission of the Regional
Director. Substitute coolants (e.g. “Water Wetter”) are highly encouraged for all
competitors.
8.8 Fuel Cells
8.8.1 Fuel cells must be stock as currently delivered by TRV or US Legend Cars
International or must be a FIA–FT3 approved fuel cell as per NASA CCR and must
remain in the stock location. Foam is mandatory in all approved fuel cells as delivered
by TRV or US Legend Cars International.
8.9 Safety Gear
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8.9.1 All drivers are required to utilize a closed-face helmet, with a certified shatter
resistant face-shield. This helmet must conform to all standards listed in the CCR. All
drivers must utilize arm restraints to help prevent injuries to the hands and arms in the
event of a rollover.
8.10 Cool Suits
8.10.1 Cool suits, helmet blowers, and associated equipment, properly secured, are
permitted, providing that none of the items serve any other purpose.
8.11 Battery
8.11.1 Only a lead acid, or gel cell battery of the same dimensions as stock (7 1/8 x 8 x 6
1/2) or Group Size 26 and 25lb. minimum weight may be used. A top post or side post
battery may be used. Motorcycle batteries may not be used. The battery must remain in
its stock location and securely mounted. The original stock battery bracket may not be
altered in any way. A battery box, terminal coverings or rubber padding around rear end
is also highly recommended. A battery shut-off switch is mandatory (see 8.5. Master
Switch).
8.12 Transponder Location
8.12.1 The transponder may not be located any further forward than the front firewall.
8.13 Front Firewall
8.13.1 A metal firewall is mandatory. The firewall must remain sealed as delivered by
TRV or US Legend Cars International. Using a “thicker than stock” metal firewall
separating the driver’s compartment and the engine compartment is permitted.
8.14 Roll Cage Safety Light
8.14.1 In an effort to make TRX Series cars more visible in mixed class racing, a LED
light with a minimum of 1500 Lumens mounted to the top of the roll cage is mandatory.
9. Specifications
9.1 General
9.1.1 All cars in this category shall compete as equipped by the manufacturer, except as
allowed by these regulations.
9.2 Weight
9.2.1 The minimum weight, with racer after any track session will be 1,725 lbs. The cars
may be weighed at any time during the event by NASA or TRX officials.
9.2.2 A car found to be underweight after a qualifying session shall start the following
race behind the last-place qualified TRX Series car, and only if the underweight car
meets the minimum weight requirement prior to the start of the race.
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9.2.3 A car found to be underweight after a race session shall be disqualified from the
race results and a notation should be made on the current event page of the car’s
logbook. The racer must ensure that the car is weighed at the next event, and shall
meet minimum weight requirements before being allowed to compete. Per CCR Rule
17.8, each competition vehicle will be given a five (5.0) pound leeway at that car’s first
official weigh of each race weekend.
9.3 Modifications
9.3.1 Engine
9.3.1.1 The TRX Series requires a (2008 or newer) Electronic Fuel Injected Gen
2 Suzuki Hayabusa 1340cc stock engine. All non performance modifications to the
Hayabusa engine to convert the engine to a proper TRX engine from the stock
motorcycle engine as it comes from TRV are considered stock. Any performance
modifications to the engine to alter the factory stock horsepower of the engine is
strictly prohibited by the series. However, the following parts of the engine
maybe substituted to increase reliability: clutch, valve springs, and rods.
9.3.1.2 Any type of after market engine tuning devices (i.e. Power Commander)
are prohibited in the TRX Series.
9.3.1.3 Dry sump systems are prohibited.
9.3.1.4 Oil coolers may be added or replaced, and their location within the
bodywork is unrestricted so long as they are not mounted within the driver/
passenger compartment.
9.3.2 Exhaust System
9.3.2.1 All TRX Series cars must meet track sound requirements, if applicable. Any type
muffler is acceptable providing that it serves no other purpose than to quiet the exhaust.
Increase in power is a side benefit and is acceptable providing the car is in compliance
with other sections of these rules.
9.3.3 Cooling Systems
9.3.3.1 Radiators
9.3.3.1.1 Any radiator may be used.
9.3.3.1.2 Electrically operated fans with manual or automatic actuation may be
added.
9.3.4 Suspension
9.3.4.1 Front aluminum spindles and steel spindles (and pickup points) must remain
stock, within the stock dimensions, steel thickness, location and configurations as
currently delivered by TRV or US Legend Cars International. Repairing a broken or
cracked aluminum spindle is not allowed. The lower control arm’s mounting points may
not be moved or changed in any way. The upper and lower ball joints must remain stock,
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within the stock dimensions, steel thickness, location and configurations as currently
delivered by TRV or US Legend Cars International and may not be reinforced in any
way. One or two (1/4” minimum 7/16” maximum) jam nuts are permitted on the upper
and lower ball joints. Each ball joint must use at least one jam nut. Maximum width as
measures at the widest part of the tire is no more 65 inches. Note: All radius rods (7.5”,
10”, 11”, 12”, 13”, 24”) length measurement will have a tolerance of +/- 1/8” (0.125”).
9.3.4.2 All shocks must be stock as available from TRV or US Legends Cars
International. Springs may be from other manufacturer but must fit shock without any
modification. Any combination of stock shocks and springs are allowed.
9.3.4.3 Rear suspension may be modified to use longer rear swing arms and rear shock
mounts may be moved to outside of frame. Any 3 point rear suspension is allowed.
Only one fixed pick-up point allowed per radius rod end. Trailing arm radius rods are to
be the same equal length. If using radius rod mounting plates, the plates will be marked
at the beginning of the season by the TRX Series directors and can only be replaced by
notification and approval of the TRX Series directors. Maximum length for radius rods
(trailing arms) is 24.” Trailing arms radius rods may be of aluminum or steel construction
with a minimum diameter of .840 & .750 respectfully. Third link must be of aluminum or
steel construction with a minimum diameter and must remain within the stock pick-up
point locations as delivered by TRV or US Legend Cars International. Panhard bar must
be of steel construction with a minimum diameter and must remain within the stock
mounting location as delivered by TRV or US Legend Cars International. Note: All radius
rods (7.5”, 10”, 11”, 12”, 13”, 22.5”) length measurement will have a tolerance of +/-
1/8” (0.125”).
9.3.4.4 Wheel Base can be no more than 96” measured center hub to center hub or
wheel lip to wheel lip during tech inspection.
9.3.4.5 Ride height must be no lower than 3” measured anywhere on the main frame
rails. Vehicle must meet weight requirements during this inspection process.
9.3.5 Rear Housing
9.3.5.1 Rear housing may be stock or a different may be used provided rear track
measured at the widest part of the tire does not exceed 65 inches. Any axle may be
used.
9.3.6 Rear Ends
9.3.6.1 Only 10 bolt pattern/wide flange (5/8”) Toyota, locked-steel rear ends are
permitted. The rear end must be locked (all spider gears welded or steel spool of a
minimum 6.0 pounds, 5.25 pounds for a 2:50 spool, as currently delivered through U.S.
Legend Cars International only). No limited slip differentials, quick change rear ends,
floaters; homemade or otherwise, hemispheric or similar type bearings are permitted.
9.3.7 Drive Shafts must be stock as delivered from TRV or US Legends Cars
International or the same dimensions, length, material, thickness and safety collar.
9.3.8 Tires and Wheels
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9.3.8.1 Tires must be Hoosier 26.5/8.0-15 Roadster Edition 880 or 26.5/8.0-15 880
Hoosiers. Wet weather tires may be American Racer USLCI 82/8.0-15 or Ohtsu FP6000
A/S 225/60R15 96H.
9.3.8.2 Wheels must be no more than 8 inches wide and 15 inches in diameter. The
minimum weight of a wheel and tire combination must be at least 33 lbs. without
additional steel, lead, or wheel weights. All wheel weights must be covered with duct
tape. Bleeder or relief valves are not permitted in the wheels.
9.3.9 Brakes
9.3.9.1 Any make and material of brake pads may be used.
9.3.9.2 Only steel rotors (not drilled, slotted or reduced in diameter) are permitted on the
front or rear. The minimum permitted thickness of the front brake rotor is 8mm (5/16)
wide; the rear rotor minimum thickness is ¼”. The minimum permitted diameter is 10
inches and the maximum is 12 inches.
9.3.9.3 Only stock or Wilwood 4-piston calipers model Forged Dynalite Lug or Narrow
Mount and Dynopro Lug or Narrow Mount may be used on front. For the rear brakes,
stock (stock includes the Wilwood rear, and drum as delivered by US Legend Cars
International) or Wilwood 4-piston Forged Dynalite Lug or Narrow Mount or Dynopro Lug
or Narrow Mount may be used..
9.3.9.4 Two master cylinders may be used one for front brakes and one for rear.
9.3.10 Ballast is permitted, and shall be securely mounted the frame, floor board or roll cage of
the car.
9.3.10.1 Ballast shall be in segments no heavier than fifty (50) pounds.
9.3.10.2 Each segment, or stack of segments, shall be fastened with a minimum of two
(2) one-half (1/2) inch diameter bolts and positive lock nuts of SAE grade 5 or better.
9.3.10.3 All ballast must be mounted within 2 feet of the center point of the driver’s seat.
9.3.11 Two-way radios may be used