2012 STAFFORD SPEEDWAY LATE MODEL DIVISION
X-Y-G TUBE FRAME RULES

CLICK HERE TO DOWNLOAD THE 2012 X-Y-G TUBE FRAME LATE MODEL RULES IN ADOBE PDF FORMAT

 

ALL RULE REVISIONS FOR 2012

CLICK A SPECIFIC RULE BELOW TO GO DIRECTLY TO THAT RULE

REV. 12/9/11 20H – 11.2 FRAME REQUIREMENTS

 

MYLAPS AMERICA            www.mylaps.com                                            1-678-816-4000

Master Frequency List                                                                                  1-207-571-9165

Racing Electronics                 www.racingelectronics.com                            1-800-272-7111

Hoosier Tire East                                                                                          1-860-646-9646

Reliable Welding & Speed    www.reliableweldingandspeed.com               1-888-225-7223

New England Racing Fuel     www.newenglandracingfuel.com                    1-860-673-9555

 

Track Frequency Channel #1            SK Modified®, Late Model                          464.50000

Track Frequency Channel #15          SK Light, Limited L.M., D.A.R.E. Stock     461.13750

 

PREFACE

 

The rules in this book are intended to make racing less expensive and keep competition as equal as possible. While these rules offer a good outline, every item cannot be covered by a written rule. If you come up with something not covered in the rules, PLEASE ASK FIRST!

All rules in the NASCAR Rulebook will be enforced with the following changes and additions. These rules are for Stafford Motor Speedway only with no expressed or implied agreement with any other speedway as to the interpretation, implementation and method of inspection by the technical inspectors and officials

No equipment will be considered as having been approved by reason of having previously passed through inspection unobserved. No car will be considered as having passed inspection for the event until the finish is made official.

The rules herein shall refer to Stafford Motor Speedway as “SMS”.

 

NOTE: All engine models, equipment changes, or modifications not specifically addressed in these rule books by Stafford Motor Speedway must be submitted to the track for consideration of approval on or prior to September 2, 2012 unless otherwise authorized by Stafford Motor Speedway to be considered for competition for the 2013 season. All equipment is subject to the approval of the track officials. Track officials may assess penalties including but not limited to weight, fines, points, or handicapping for cars, car parts, components, and/or equipment deemed as not in compliance with these rules. Car parts, components, and/or equipment will not be considered as having been approved by reason of having passed through inspection at any time or any number of times unobserved or undetected. Any car, car part, component, and/or equipment which does not conform to specifications or tolerances contained in the 2012 rule books or is not otherwise approved by Stafford Motor Speedway may not be used in competition in 2012 Any new part or component to be considered for approval for competition must be submitted to Stafford Motor Speedway. The owner/driver must provide all information and/or parts or components to Stafford Motor Speedway and must provide any part or components to be used as comparison items for inspection purposes.

 

DEFINITION OF STOCK: In the following Rules you will see the term OEM Stock used. This means Original Equipment Manufacturer. The parts must come on a standard production car. Special "Off-Road" or racing parts will not be permitted unless pre-approved. No carbon fiber or titanium engine, chassis or body parts unless approved by track officials.

 

ILLEGAL ITEMS - Absolutely NO removal of, alteration of, or covering of casting numbers, part numbers, manufacturers name, logo, insignia, etc., from any item on the race car. To do so makes a part illegal and will be treated as such. If you come up with a rare part that we cannot find listed for passenger car use, the burden of proof is on you. At any time you may be asked to remove a head, manifold or possibly an entire engine for inspection. Failure to comply will result in the same penalty as if it were illegal.

 

INSPECTION - All model, engine or equipment changes or modifications not specifically addressed in this rulebook must be submitted to Stafford Speedway for consideration of approval. All equipment is subject to the approval of Track Officials. Equipment will not be considered as having been approved by reason of having passed through inspection unobserved. Any equipment that does not conform to specifications or tolerances contained in this rulebook or is not otherwise approved by SMS may not be used in competition.

 

POST RACE INSPECTION - Once a car has been presented to SMS Technical Inspectors for post race inspection the entire car and all its parts become subject to inspection. This includes but is not limited to items designated for inspection following a particular event.

 

Scales-For purpose of post race inspection drivers must be seated in their car in a racing position with their helmet either on or placed on their lap at all times. No leaning or hanging on bars is permitted. The driver must remain in his/her car until it is removed from the scale area.

 

ABSOLUTLEY NO SMOKING IN THE FENCED IN TECH AREA.

 

The rules in this book may be added to, deleted from or changed at any time with the only notice to be given at the event drivers meeting or via technical bulletin. All SMS officials’ decisions are final, non-appealable and non-litigable. Technical bulletins will be issued as needed.

 

UPDATES - All changes and updates made during the course of the season for the current rulebook will be posted to the SMS website. This will serve as the only form of official notification until the printing of next SMS rulebook.

 

CONTINGINCIES - Contingency sponsors are a valuable part of SMS program. Contingency stickers must be displayed for either product or monetary considerations. Each division will be notified as to what stickers are required to be eligible for contingency rewards. The stickers MUST be displayed on both sides of the car in such a manner as to be CEARLY VISIBLE in a photograph.

 

STAFFORD SPEEDWAY TRACK RULES

 

NOTICE - Alcohol will not be permitted in the SMS pit or paddock areas at any time. The consumption of alcohol before, during or after a race event in the pit or paddock areas is prohibited.

 

SECTION 1-4- All NASCAR rules that are printed in this book, and states see Nascar rule book will be enforced with the exception of the following SMS rules. These rules supersede any similar NASCAR rules and are in effect for all auto racing events unless otherwise posted and/or announced prior to the event.

 

SECTION 6 SAFTEY-Stock car racing is an inherently dangerous sport. Each Competitor assumes that risk when he or she participates in an Event. The risk of serious injury or death cannot be eliminated and in fact will always be present at a high level. Members are required to advise their spouses and next of kin, if any, of this fact. Although safety is generally everyone’s concern, SMS cannot be, and is not responsible for all or even most aspects of the safety effort. That responsibility instead rests with the various participants in the Event(s) as follows. All competitors are obligated to inspect the racing facilities, safety personnel and equipment, and conditions at the track on a continuing basis, before, during and after the event. Competitors must report to SMS management promptly any inadequacy in the facilities, personnel, equipment or conditions at the track.PASSENGERS are not permitted in or on a racecar at any time. No one shall ride with any part of his or her body outside the racecar. No riding on trailers or car haulers anywhere on the speedway property.

 

NEITHER SMS NOR TRACK OFFICIALS CAN OR WILL BE RESPONSIBLE FOR THE ADEQUACY OF A COMPETITOR’S RACECAR, RACING EQUIPMENT OR RACING ACTIVITY TO ACCOMPLISH THIS PURPOSE.

 

SECTION 9 RACE PROCEDURE

1. All cars must go into the infield before turning into the off-track paddock gate except at the conclusion of the feature event. No right turn from the track to the paddock. All cars must go through the infield road after each warm-up session and qualifying event. After feature events cars may go directly into the paddock area without going through the infield. The first three (3) cars in the feature finish must report to victory lane. DO NOT DO BURNOUTS OR DONUTS ANYWHERE ON THE RACE TRACK OR INFIELD AFTER THE FEATURE EVENT OR AT ANY OTHER TIME. The top four finishing cars, plus any others that are asked by an SMS Official, must report to the scale area immediately after the event. The top three finishing cars shall report to the tech area after scaling, and if one of the top three finishers fails post-race weight, then the fourth place finisher shall report to the tech area. 

2. The track crew, officials, wrecker or push truck drivers are not allowed to work on race cars on the track, infield, pit or paddock areas.

3. No car will be permitted to pass the caution vehicle unless instructed to do so by SMS Officials.

4. No car will be permitted on the track at any time without a hood.

5. All owners of cars that the oil pan cannot be removed with the engine in the chassis must have a carb flange lift plate or other device for the removal of the engine.

6. All jack stands must have a flat plate (pad) welded to the bottom.  This rule applies to both the infield pit and paddock areas.

 

SECTION 9.5 HANDICAPPING: Some rules do not apply to DARE STOCK Division.All drivers must complete a Number Application form before signing in.For all events your car must be signed in 45 MINUTES before the first heat race is scheduled. Once the line-ups are posted no additional cars may be added. If your car is signed in but does not arrive you may be credited with two wins for handicap purposes.

When you sign in your car state your division, assigned car number and the driver’s name. If you bring two cars, one as a BACK-UP CAR, you must decide and indicate which car will be your primary car when you sign in. Drivers will be handicapped on a 3-week money won system. For handicapping purposes regular feature event purses will be used. Any driver that misses an event will be credited with a regular feature win in money plus 1/2 feature win in money for handicapping purposes. Any driver disqualified from a feature event will be credited with a regular feature win plus 1/2-feature win in money for handicapping purposes. The top 18 drivers in points will be handicapped ahead of drivers not in the top 18 for the main feature only. No current season feature-winning driver may be posted to start higher than fifth position in a feature event. For some events the top ten cars in points may be considered as pre-qualified. The car must still be signed in 45 minutes before racing starts to take advantage of being pre-qualified. All alternate feature cars will be taken from the consolation event. If a car is disqualified from a heat additional cars will not be taken from heats but from the consolation or‘B’ feature. If in the opinion of SMS Officials a car is not competitive on a given night, we have the authority to deny that driver their handicapped starting position.

 

PAST CHAMPION’S PROVISIONAL POSITION-  One additional starting position has been established which is available to the most recent SMS Champion who has not qualified for the starting field.  If a former SMS Champion is not assigned this starting position, it is then assigned to the next eligible driver who did not qualify for one of the original starting positions based on the current SMS Championship point standings.

 

PROVISIONAL POSITIONS- Two additional starting positions are available to the highest drivers in the current SMS Championship point standings who have not qualified for the starting field.

 

ROOKIE RULES-

A. In order to be granted Rookie consideration, a driver cannot have competed in more than five (5) races in your selected or higher division at SMS in any previous season.

B. In order to be considered for the SPAFCO Rookie of the Year Award, a driver must compete in at least 50% of the feature events during the course of the current season.

C. All cars driven by rookies must have a yellow stripe on the rear bumper. Rookies may not have another driver qualify a car for them.

D. The current Rookie of the Year, as determined from the previous season, will be awarded $100 for each event attended, starting with the first event of the current calendar year and continuing each consecutive event until the total award amount for each division is distributed. To be eligible for the Rookie of the Year award the driver must attempt to qualify. If the current Rookie of the Year as determined from the previous season is not eligible for this award, the award will then be available to the next highest finishing eligible rookie driver in the previous season Rookie of the Year points standings.

 

SECTION 9.6 STARTING LINE-UP & RESTARTS- If a car(s) drops out of the posted starting line-up, all cars in that row will move straight up to fill the spots in all events (you do not cross-over). If a restart occurs with ten (10) laps or less to the end of the feature, all lapped cars will be placed behind the lead lap cars in the restart line up.

 

SECTION 10.4 YELLOW & RED FLAG/LIGHT- The Yellow & Red Flag condition will be used for feature events where the yellow flag laps are being counted. If in the opinion of SMS Officials the yellows are using up too may laps the red caution will be used. The laps will not count against the feature total but if you pit you will lose the amount of laps you are in the pits.

 

SECTION 10.8 CHECKERED FLAG - RACE END- All feature event races will end with a GREEN, WHITE, CHECKERED unless in the opinion of SMS Officials the track is no longer safe for racing.

 

SECTION 11.1 OFFICIAL SCORING- SK Modifieds®, Late Models, SK Light Modified and Limited Late Models must have a scoring transponder assigned and attached to the racecar anytime it is on the track.. (Please see installation specifications on page 7). All competitors will have 15 minutes after their feature event is announced and posted to file an inquiry. Once the inquiry is satisfied the official finish will be posted. No changes will be made once the finish is official.

 

FOR SALE SIGNS- For Sale signs are not permitted on cars in feature events.

 

BACK-UP CARS– Separate number registration is required for back-up cars. No cars competing in the same division are allowed in the paddock area with the same number.

 

INFIELD PITTING

1. Infield pitting will be used for all SK Modified and Late Model features.  All crewmembers that go to the infield pit area will be required to have a NASCAR license. During race conditions, any crewmember who steps into the car servicing area must be wearing an approved helmet. All people on the infield must wear long pants with a minimum short sleeve shirt and closed toe footwear at all times. You must pit in your proper pit stall.

2. NASCAR pit rules apply, including the amount of crewmembers over the wall, etc. An SMS Official will be at the exit of pit road only. You may not enter pit lane until the pace car picks up the leaders and the pit road is opened. You may pull up to but not pass the pace car.

3. No crewmember may go into the pit box until their car has come to a complete stop.

4. Pit stalls will correspond to the starting positions of the feature line up.

5. The speed limit on pit road at all times including qualifying and practice is 25 MPH. Speeding in the paddock or infield pit area may result in disqualification.

6. Fueling/refueling of cars is not permitted on the infield. Fuel containers are not permitted on the infield.

7. Wreckers and push trucks are not permitted to bring pit materials to the infield to set up any pit stalls.

8. All cars out of the event must go behind the wall on the infield.

 

6- 4 PERSONAL SAFETY EQUIPMENT-

See the NASCAR Weekly Series rule book.

 

20G - 3.2.3 SIDE GLASS / WINDOW SCREEN-  All door window glass must be removed. A window screen must be installed in the left side door window opening and should be positioned to cover the entire window opening. Window screens may not be used beyond three (3) years from the date of manufacture. The window screen must be a rib type, made from minimum 3/4 inch, maximum one (1) inch wide material with a minimum one (1) inch and a maximum 2-1/4 inches square opening between the ribs. Window screens are recommended to meet the SFI 27.1 specifications. The minimum window screen size must be 22 inches wide by 16 inches high. The forward edge of the window screen, when in the closed position, must be in line or forward of the steering wheel. All window screen mounts must be a minimum 1/2 inch diameter solid steel rod on the bottom and a minimum one (1) inch wide by 3/16 inch thick flat steel or a minimum 1/2 inch diameter solid steel rod on the top, with mounts welded to the roll cage. When latched, the window screen must fit tight and be secured with a lever-type quick release latch acceptable to SMS Officials. The lever must be secured by a detent ball in the lever and may be supplemented by a Velcro® fastener only - pins or clips will not be permitted. The latch must be mounted at the top/front to roof bar (#3) or at the top/front roll bar leg (#2A) near roof bar (#3) and release from the inside.                     

 

6- 4-1 HELMETS- HEAD AND NECK RESTRAINT DEVICES-

See the NASCAR Weekly Series rule book.

 

6- 4-2 SEAT BELTS- Seat Belts may not be used beyond three (3) years from the date of manufacture. See the NASCAR Weekly Series rule book for additional rules.

 

6- 4-3 SEATS-

See the NASCAR Weekly Series rule book.

 

SCORING TRANSPONDER LOCATION- Transponder mounting brackets must be installed on the inside (or outside) of the right rear frame rail. The round post of the bracket must be on top and the square tab on the bottom flush with the lower edge of the frame rail. The bracket must be mounted with its center line exactly 12” to the rear of the rear axle centerline and must be completely vertical to the ground. Keep exhaust directed away from transponder.

Transponders are available from

MYLAPS AMERICA

32 Highlands Parkway, Suite 104

Smyrna, GA 30082

Tel 678-816-4000 Fax 678-816-4001

 

 
LATE MODEL DIVISION

X-Y-G TUBE FRAME RULES

 

The following rules apply for the SMS Late Model division (X-Y-G SUB-SECTION). Additionally, the NASCAR Whelen All American Series rules will apply where noted. FOR ALL OTHER RULES REFER TO THE (OEM) LATE MODEL RULE BOOK.

 

DRIVER ELIGIBILITY– All drivers must have a NASCAR CHD (Charger Division Driver) or higher driver’s license. Drivers competing in the Late Model division are not permitted in the SK LIGHT MODIFIED, LIMITED LATE MODEL, or DARE STOCK division on the same event date. Drivers must be a minimum 16 years of age to compete in the SK Modified® division.

 

20F- 1 COMPETING CHASSIS  - The only approved frame will be the X-Y-G Tube Frame. Built from rules listed below. All frames must fit SMS X-Y-G fixtures and measurements. NO EXCEPTIONS! CHECK BEFORE YOU BUILD IT!

 

20F- 2.1 BODIES – All bodies must be Stafford Motor Speedway approved. See Stafford Motor Speedway Late Model OEM Rulebook for approved bodies and additional body specifications. Original dimensions of all bodies must remain as manufactured except for changes, which may be necessary for tire clearance. All aftermarket body and trim parts must be acceptable to SMS Track Officials. All Late Models will be subject to the NASCAR LMS body type measurements. Track officials will use LMS type templates to insure the measurements from car to car are the same. All vertical measurements from the NASCAR Rule Book will be plus one (1) inch. With the exception of the 18 ¼" min deck lid length all other measurements that say minimum or maximum shall be considered as exact for this division. Tolerance will be built into the templates from the manufactures. Any other models must be approved by SMS. All vertical body measurements will be done by ride height.

 

20F- 3 DETAILED BODY REQUIREMENTS – The 2007 through 2012 Composite Body is the only approved body type. Body must be, straight and stock, mounted in the stock location on the frame. No lowering, chopping, channeling or streamlining of any body parts or roof. Stock window openings must be maintained. No fiberglass replacement parts unless noted elsewhere in the rules. All exterior chrome trim ornaments, outside mirrors and door handles must be removed. Replacement body parts must meet NASCAR templates. No body skirts or lower body rocker panel flares. Rolled under rocker panels are recommended. Rear quarter panels may be plastic or steel only.

 

20M- 3.4 FIRE WALLS

A. Front firewall must be no further than 2.250" from the front edge of frame rails, and be made of minimum .031" magnetic sheet metal with all holes covered using sheet metal a minimum of .031" thickness. The front firewall must extend down to the top of the frame. The bottom 8.0" may angle no more then 70 Degrees, before going upward at 90 Degrees.

B. Rear firewall must be made of minimum .031" magnetic sheet metal securely installed over the rear seat back brace and top shelf or “hat rack”, completely closing off the trunk compartment.

C. The top shelf or “hat rack” must be positioned horizontal and approximately level, attaching to the #7 bar . On the driver side of the hat rack, there must be a containment area for the seat belts. This can be constructed by making a cut out 42" from the back edge of the hat rack. The inverted box should go from the top of the hat rack to the top of the #6 bar. This box should be approximately 13.500" by 8.250" and be angled at 70 degrees and must be welded in place.

D. The interior area of the car must be completely enclosed from front to rear with fire walls made of not less than 22 gage (.031 inch thick) magnetic sheet steel. The floor area on the left side must not be lower then the top of the frame rails except an area maximum 24 inches by 24 inches directly under the seat where the floor may be dropped not lower than two (2) inches above the bottom of the frame rail. The floor area on the right side of the seat may be a maximum eight (8) inches to the top of the driveshaft tunnel and extend to the right door panel. All interior panels must be welded. Door bars may not be paneled on the inside. All door bars above eight (8) inches must be visible from inside car. The floor must be sealed to the bottom of the door on both sides of the car. The rear seat area must seal to the rear firewall.

E. Door bars may not be covered on the interior of the car and must be visible for inspection from the inside of the car.

 

20F- 3.5 DOORS - Doors must be magnetic sheet steel. External nerf bars may be used if no larger than 1” round tubing. Bars must be “skin” tight and painted the same as the body panel it is attached to. Bars must be at centerline of the front and rear tire. No bars behind rear wheels. Ends must be turned into and go through the body or bolted at the end of the bar with a flush bolt that goes trough the body to an interior bar of the same length as the outside bar to prevent hooking. The outside bar must have the ends rounded. No spreading or narrowing of body. Replacement doors must have stock contour. No slab sided cars.                                                                                                                                                           B. Cars must have a magnet steel anti-intrusion plate minimum 0.090 inch thick, installed on the outboard side of the left side door bars. (See NASCAR rule book 20F-3.5-B for mounting instructions & diagram).

 

20F- 3.6 FENDERS - Approved composite type material only. The approved composite quarter panel and fender must be used as manufactured.

 

20F- 3.8 HOODS, ROOF

A. Hoods must be 2007-2012 approved composite bodies only .All panels must be flange -mounted and remain as manufactured .The hood and scoop must seal tight to the fenders and windshield. Hood must be in place at all times.

B. Hood must be held closed with quick release pins. Hinged hoods are permitted.

C. No holes or functioning air scoops allowed. Hoods must lay flat.

E. All roofs must be the same size and shape of a production roof. Steel or fiberglass roof permitted. Roof panels must be permanently mounted in the stock position the same as a stock production roof for the make and model car being used. THESE BODY PANELS MUST CONFERM TO THE NASCAR -APPROVED MANUFACTURER TEMPLATES AND THE NASCAR -APPROVED BODY AND COMPONENTS.

 

20F- 3.10 BUMPERS/BUMPER COVERS –

B. Magnetic steel tubing must be used to reinforce the front and rear bumper covers. The tubing that is used for the main structure of the bumper must not be exposed and must remain behind the bumper covers. A maximum of two 90 degree one and a quarter (1 ¼) outside diameter round tubing will be allowed to be added to the fuel saver bar, and connect to the bottom of the main bumper bar. These bars may be bolted or welded in place, and are the only bars that will be exposed from the bumper cover. This will be the only allowed configuration, NO EXECPTIONS!

 

20F- 4 GENERAL ENGINE REQUIREMENTS                                                              

THE ONLY APPROVED ENGINE FOR THE X-Y-G LATE MODEL WILL BE THE SMS SPEC MOTOR (Engine –C)

 

20M- 9 ENGINE EXHAUST SYSTEM- The exhaust if exiting out the side of car must not exit through the body. It must turn down before the inside of the body. NO EXCEPTIONS !!Both exhaust pipes must be independent with no connection between them.

 

20H – 11.2 FRAME REQUIREMENTS

(NOTE: THE ONLY APPROVED FRAME UPRIGHTS FOR THE FRONT & REAR SUB-FRAMES WILL BE OF THE MANDREL BENT SECTIONS NO EXCEPTIONS.) ALL VERTICAL MEASUREMENTS WILL BE ON 5 INCH RIDE HEIGHT BLOCKS)

A. Main Frame

(1) A tubular magnetic steel frame must be used. Offset frames will not be permitted. The main frame side rails must be parallel and be an equal distance from the centerline of the frame. The main frame side rails must be the same size (left and right, height and width), constructed using a single tube, and must be magnetic steel box tubing three (3) inches in width by four (4) inches in height with a minimum wall thickness of not less than 1/8 inch meeting ASTM A-500 specification. The main frame side rails start at a distance of 20 inches forward of the rear axle centerline and extend forward a length of 66 inches. When measured from the outside of the left frame rail to the outside of the right frame rail, a width of 54 inches, plus or minis (+/-) 1/2 inch, must be maintained. The distance from the outside edge of the main frame side rails, left and right, must be the same, measured from the centerline of the tread width, front and rear.

(2) Sub-frame kick outs must be constructed using a single tube and must be magnetic steel box tubing three (3) inches in width by four (4) inches in height with a minimum wall thickness of 1/8 inch meeting the ASTM A-500 specification. The sub-frame kick-outs must turn in 90 degrees to the main frame side rails and be welded to the inside ends of the main frame rails. The open ends of the sub-frame kick-outs must be closed by welding caps on the ends or bolting weight containment caps. The distance from the front of the front kick-out to the rear of the rear kick-out must be 66 inches. The front kick-out must measure 86 inches from the rear axle centerline.

(3) A crossmember constructed of magnetic steel box tubing, two (2) inches by two (2) inches with a minimum wall thickness of 0.083 inch meeting the ASTM A-500 specification, must be welded between the main frame side rails at a distance of 48 inches from the rear axle centerline.

(4) All frames must have diagonal cross bracing constructed of a minimum one (1) inch by one (1) inch by 0.065 wall thickness tubing.

(5) All crossmembers and diagonal bracing must be installed flush to the top of the main frame side rails. Center of crossmembers a maximum width of 12 inches may be dropped for driveline clearance. No part of the crossmembers or diagonal bracing will be permitted to extend lower than the main frame side rails.

(6) On race tracks 3/4 mile or more in length, a rear transmission crossmember will be mandatory.

(7) If the optional tubular metric frame is used, the center to center dimension of the main roll bar #1 and the rear axle must be a minimum of 23-1/2 inches.

 

B. Rear Sub-Frame

(1) The rear sub-frame rails must be configured and attached in the same location on the left side and right side to the sub-frame kick-outs four (4) inches in from the outside edge of the main frame rails. The rear sub-frame when measured from the outside edge of the left sub-frame rail to the outside edge of the right sub-frame rail must measure 46 inches, and this width must be maintained for the entire length of the sub-frame. The rear sub-frame must angle rearward and upward at an angle between 45 degrees and 50 degrees to a maximum height of 22 inches from the ground (on five (5) inch blocks), then angle rearward parallel to the main frame rails a maximum distance of 16 inches, then angle down to a minimum height of 11 inches and a maximum height of 14 inches from the ground. The rear sub-frame must be constructed using magnetic steel box tubing, two (2) inches in width by three (3) inches in height, with a minimum wall thickness of 1/8 inch and must be similar in design and configuration to standard OEM automotive rear kick-ups.

(2) The rear sub-frame tail section must extend rearward at a minimum height of 11 inches and a maximum height of 14 inches, to a maximum length of 38 inches from the centerline of the rear axle. The rear sub-frame tail section side rails must be parallel to the main frame side rails and have a minimum length of 24 inches. The rear sub-frame tail section must be constructed using magnetic steel box tubing two (2) inches in width by three (3) inches in height with a minimum wall thickness of 0.083 inches.

(3) The rear sub-frame must incorporate the mounting locations for the rear springs, shock absorbers, panhard bar, and fuel cell, ending with a crossmember constructed of magnetic steel box tubing two (2) inches in width by three (3) inches in height with a minimum wall thickness of 0.083 inches a maximum length of 38 inches from the centerline of the rear axle.

(4) A reinforcement bar, made from round magnetic steel tubing, minimum 1-1/2 inches in diameter with a minimum wall thickness of 0.083 inches, must extend below the rear sub-frame section behind the fuel cell. This reinforcement bar must be as wide as the rear sub-frame rails and extend as low as the bottom of the fuel cell with two (2) vertical uprights evenly spaced between the sub-frame rails and attached to the rear crossmember. Two (2) support bars, one (1) located on each corner, must angle upwards and be welded to the rear sub-frame side rails. (See the Construction Guidelines in the rear pages of the Rule Book)

(5) Weight containers, if used, must only be attached to the inside of the frame rails and must not be lower than the bottom of the frame rails.

6. The back of the rear sub frame from the center line of the rear end. may be mitered , to conform to the rules stated above. (This will be the only mitered section allowed, excluding the front radiator support.)

After the car is built, if the rear sub-frame has to be repaired, a mitered section will be allowed. NOT THE FRONT.  NO EXCEPTIONS.

 

C.  FRONT SUB-FRAME

 The front sub-frame must be constructed by the following guidelines:

ALL VERTICAL DIMENSIONS WILL BE ON FIVE (5) INCH RIDE HEIGHT BLOCKS

Many Dimensions will come from a front frame kick-out that is eighty six (86) inches from the rear axle centerline constructed of three (3) inches wide by four (4) inches magnetic steel tubing with a minimum wall thickness of 0.125 inch meeting ASTM A-500 specifications. The GM-METRIC TUBULAR mainframe width will be an O.E.M. dimension of fifty four (54) inches from the outside of the left frame rail to the outside of the right frame rail and a length of sixty six (66) inches starting at a point eighty six (86) inches forward from the rear axle centerline constructed using three (3) inch wide by four (4) inch high magnetic steel tubing with a minimum wall thickness of 0.125 inches.

(1) A GM-METRIC type front steer tubular front sub-frame must be constructed using two (2) inch wide by four (4) inch high magnetic steel tubing with a wall thickness of 0.125-inch meeting ASTM A-500 specifications. The front sub-frame rails must be parallel to each other both vertically and horizontally. The front sub-frame rails must be parallel both vertically and horizontally to the mainframe rails from the jack bolts forward. All front steer assemblies must maintain a dimension of 31 inches from the center of the left side frame rail to the center of the right side frame rail at a point from the jack bolt extending forward in front of the steering assemblies. Spring bucket and jack bolts may be cut into left side and right side frame rails. Top of spring buckets will maintain a vertical height of 15 1/4 (+/-) 1/2 inch. Jack bolts will maintain a centerline distance of 33 1/2 (+/-) 1/2 inch measured at top of spring bucket from left side to right side and be located equal distance from centerline left and right. A distance of 21 inches (+/-) 1/4 inch must be maintained from the front frame kick-outs forward to the jack bolts centerline. Jack bolts will be allowed a maximum angle of five (5) degrees from vertical. The front sub frame rails may angle outwards and downwards from the jack bolts to the front frame kick-out to a maximum distance of 41 inches. If frame rails are angled outward a wishbone made from round magnetic steel seamless tubing 1½ inch by .083 minimum wall thickness meeting ASTM A-519 specification must extend from dash bar #8 to an area at the rear lower a-frame mount and continue to connect at an intersection of roof support bar #12 and diagonal bar # 7A. The front frame extensions using two (2) inch wide by three (3) inch high minimum wall thickness of 0.083 inch magnetic steel tubing meeting ASTM A-500 specifications must angle out and forward and extend a distance of twelve (12) inches forward of the forward most top steering box bolt to a minimum distance of 33 inches from the center of the left side frame rail extension to the center of the right side frame extension. This forward top steering box bolt will be a horizontal distance of 39 inches from the front frame kick-out and a vertical height of 15 inches (+/-) 1/2 inch. (Steering box bolt location will be inspected with a fixture that will read zero (0) degrees with the frame on five (5) inch ride height blocks). At a point four (4) inches in front of the top steering box bolt a two (2) inch wide by four (4) inch high magnetic steel tubing with a minimum wall thickness of 0.125 inch meeting ASTM A-500 specification must extend rearward a distance of 34 inches than angle down 30 degrees to the front frame kick-out. A distance of 24½  (+/-) 1/8 inch must be maintained from the front of the sub-frame kick-outs to the center of an O.E.M. three quarter (3/4) inch pin boss located on the mainframe centerline at the front of the front sub-frame crossmember. O.E.M. pin boss will be used for locating inspection fixtures. The front sub-frame crossmember must be mounted at the centerline of the front sub-frame at a 90 degree angle to the main frame side rails against the back of the ¾ inch pin boss and be constructed using two (2) inch high by four (4) inch wide magnetic steel tubing with a minimum wall thickness of 0.125 inches meeting the ASTM A-500 specifications. A minimum thickness of one hundred thousands (0.100) 12ga.magnetic steel must be used to construct the remainder of the front sub-frame crossmember. The front mounting points for the front lower a-frames must be constructed using a minimum 3/16 inch thickness magnetic steel. The front mounting points for the front lower A-frames must be 9 3/8 inches, measured from the centerline of the front sub-frame to the centerline of the mounting bolt at the front side of the mount and a vertical height of seven (7) inches (+/-) 1/4 inch. The rear mounting points for the lower A-frames must be constructed using a minimum 3/16 inch thickness magnetic steel. The rear mounting points for the lower A-frame must be 13 inches (+/-) 1/4 inch measured from the centerline of the front sub-frame to the centerline of the mounting bolt at the rear side of the mount and the vertical height will be 6 7/8 inches (+/-) 1/4 inch. Adjustable insert slugs may be used on the rear mounting bolt to maintain a distance of 22 inches (+/-) 1/2 inch from the center of the lower ball joint to the leading edge of the mainframe side rail and kick-out. A 1/2 inch round by 15 inch long solid steel pin must pass freely through these points during inspection. When measuring either the right side or left side the distance from the centerline of the bottom ball joint to the centerline of the sub-frame must be equal. The mounting plates for the upper A-frames must be welded to the top of the sub-frame rails and be parallel with the centerline of the sub frame rails. A distance of 37 inches will be maintained from the top idler arm bolt centerline to the front frame kick-out with a vertical height of 14 inches (+/-) 1/4 inches. The GM-METRIC TUBULAR REPLACEMENT FRONT SUB-FRAME MUST WEIGH A MINIMUM 95lbs. A bare front sub-frame must be submitted to track officials for weigh in and approval. Front sub-frame must be acceptable to SMS track officials before it can be used in competition.

(2) Approved Front-sub frames are Johnson Chassis Part # JCI 09-011 and Part # GHC-54108-Hamm’s Welding.

 

20M -18 ROLL BARS- Roll Cage #1 bar must be located a minimum distance of 22-1/2 inches and a maximum 24-1/2 inches forward of the rear axle centerline.                                                                      Roll bar #1 must be in the same location on the left side and Right side. SMS Track Officials may request an access hole be added or any obstructions be removed to acquire a straight line measurement from the back of Roll bar # 1 to the centerline of the rear axle. The main roll bar must be mounted vertical (90 degrees) on the center section of the frame with no offset or setback. The #1 bar must be centered to the chassis. The roof bar (referred to as #3) must be within 4” of the side window and/or door openings on both sides, as well as the front windshield. All roll bars must follow the contour of the body. The #2A & #2B bars must be no more than two (2) inches behind the length of the A-pillar in the stock location.                                                                                                                      Positively no offset roll cage !!!!

A diagram will be available for builders.

 

NOTICE – Competitors are solely and directly responsible for the safety of their race cars and racing equipment and are obligated to perform their duties (whether as a car owner driver or crew members) in a manner designed to minimize to the degree possible the risk of injury to themselves and others.

 

NOTE: ALL VERTICAL BODY MEASUREMENTS ARE AT RIDE HEIGHT WITH DRIVER AND ALL VERTICAL FRAME MEASUREMENT ARE ON 5" INSPECTION BLOCKS NO EXCEPTIONS.

CONTINGENCIES - Contingency Sponsors are a valuable part of Stafford Motor Speedways program. Contingency stickers musty be displayed for either product or monetary considerations. Each division will be notified as to what stickers are required to be eligible for contingency rewards. The stickers MUST be displayed on both sides of the car. In particular, the decals must be mounted on the driver’s side of the car in such a manner that they are CLEARLY VISIBLE in a photograph.