2022 Sprint Car Rules


  1. General Rules for Butler Motor Speedway Sprint Cars 2022


    1. All drivers must have a Raceceiver one-way communication device. It is the responsibility of the driver to make sure their radio is working at all times. Failure to comply with instructions issued over the radio due to device malfunction may result in removal from the race until your radio is fixed.
    2. Transponders: Westhold yellow transponders are mandatory. A driver may use their own transponder or rent one. It is important that the transponder has no metal or carbon fiber between it and the track surface that will block the signal emanating from the transponder.
    3. Previous racing experience is required for drivers under the age of 16. Drivers under the age of 16 must seek approval, prior to competing. Drivers under 18 years of age must have a parental consent form signed by parent(s) or legal guardian(s).
    4. Waiver forms must be submitted in color and cannot be folded or creased.
    5. No earnings will be issued until required W-9 tax forms are completed and returned. Drivers are considered an independent contractor and as such are responsible for all charges and taxes on any funds received.
    6. All cars are subject to inspection at any time. Butler officials reserve the right to refuse entry to any car or driver determined to be unsafe or that do not meet the rules.
    7. No alcoholic beverages will be consumed by drivers or their pit crew at any time prior to or during an event. Use, sale or distribution of illegal drugs at any time shall be cause for immediate suspension. Participation by a team member in either activity will result in disqualification with all points and earning being forfeited to the year end points fund.
    8. The driver is the sole spokesperson for the race team and is responsible for their actions. Any drivers or crewmembers fighting will result in disqualification for that team and all points and monies for that evening will be forfeited. Striking an official will result in disqualification for the evening, loss of membership, forfeiture of all points and moneys for that evening, and up to a one-year suspension.
    9. Verbal abuse or inappropriate behavior will not be tolerated. No warning will be given. If violated, the team may be disqualified with all points and/or money forfeited for that night. Other penalties may be applied depending on specific situation.




    Safety requirements include but are not limited to the following:

    -General car safety: At a minimum, competitors are bound to conform to all safety rules in this book and all current, universally accepted sprint car safety requirements.

    -Driver’s seat: An approved full containment seat is mandatory.

    -It is STRONGLY RECOMMENDED that the seat meets FIA and/or SFI specifications.

    -Seat mounting must be per manufacturer’s recommendations.

    -The driver’s left side head rest / helmet surround must extend at least 4” inches forward from the back of the headrest (where the helmet contacts the back of the headrest). All areas surrounding the head should have padding.

    -An approved driver’s cockpit net is mandatory for the left side if the helmet head rest / helmet surround is less than 7”-inches forward from the back of the seat. The net must be a minimum of three (3) ribbons, meet the SFI 37.1 specifications and be installed per the manufacturer’s specifications.

    -A frame rear cross member or rear end bar should be mounted below the lowest part of the seat.

    -Personal safety equipment: Driver must wear helmet, driver suit, minimum five-point harness system, shoulder harness, anti-sub strap and arm restraints, anytime car is started.

    -Flame retardant driver suit, gloves, socks, underwear (unless 3-layer suit is utilized), and shoes are mandatory.

    -Approved racing, full-face helmet is mandatory; a Snell SA 2010 or Snell SA 2015 sticker is mandatory. It is recommended that helmets meet the Snell SA 2015 standard, although Snell SA 2010 helmets are still approved for use.

    -Five-point harness system and arm restraints must be no more than three years old and contain unaltered SFI safety labels.

    -Quick release steering wheel is mandatory.

    -A five-pound fire extinguisher is mandatory in each pit.

    -A head and neck restraint system is STRONGLY RECOMMENDED.


    Car Specifications


    -Appearance: Car must maintain conventional sprint car appearance.

    -Appearance: The number must be prominently displayed on both sides of the fuel cell, both sides of the top wing, and it is highly recommended to have a number on the top of the center section of the top wing.

    -Frame: Cage support bars are required.

    -The left and right-side support bars do not have to be the same.

    -The support bars must be minimum 1.375” diameter X .083” ASTM4130 normalized steel or equivalent material.

    -Fuel tank: All cars must be equipped with a conventional tail tank and fuel cell/bladder.

    -Weight: Cars are weighed for the purpose of evaluating car safety. The car must be 1400 pounds minimum with driver. Any competitor who refuses to have their car weighed when directed to do so will be disqualified, will lose all points and money for the race program.

    -Electronic devices and battery-powered devices allowed include:

    Magneto ignition boxes

    Tire Bleeders

    Distributor ignition batteries



    Timing/scoring transponders

    Helmet ventilation systems

    Oil pressure and water temperature digital gauges and warning lights


    -Traction control devices are not allowed.

    – Other devices are not allowed unless prior written approval has been given. Unapproved devices will be confiscated. This includes all devices that use any power such as batteries, internal power supplies, wind-up, etc.

    -Cockpit adjustable devices: Only a top wing slider is allowed.

    -Other devices including but not limited to brake bias, shocks, and suspension are not allowed unless prior written approval has been given. Unapproved devices will be confiscated.

    -Reinstatement of a banned car: To be reinstated, a car owner must 1) Make changes to bring the car into conformance with all rules and the spirit and intentions of the rules, 2) Schedule an appointment to have the car assessed, 3) Provide proof of conformance, 4), Get the car assessed, 5) Provide a conformance, safety, and liability affidavit. The director will decide if the car is reinstated.

    -No restrictions to the engine.

    -Unaltered mufflers or inserts are required at most tracks.

    -All mufflers must be bolted, clamped or welded on header.

    -If a muffler is lost during a racing event the car will be disqualified and scored last.

    -Officials reserve the right to measure Db levels of any competing car to ensure muffler is working properly.




    -Center foil maximum size of 25 square feet with a maximum width of 60 inches with a one degree plus or minus tolerance. Center foil shall be fully sheathed in aluminum. Vent holes are strictly prohibited. Other than the slider mechanism, no moving parts allowed on or in foil structure. Wing must be fabricated of metal alloys only. No fiberglass, carbon fiber or other similar material may be used in the basic framework of the wing.

    -A maximum 2 inches removable wicker bill may be mounted on the rear edge of the center foil. Wicker bill must be 90 degrees to the top of the center foil. Built-in wicker bills or gurney lips will not be permitted. The maximum dimension of wicker bill may change periodically. Any such changes will be issued in writing prior to the event in which the change will be made.

    -The 12-inch section located at the rear of the center foil must not have the belly/curl arc out of proportion with the rest of the center foil. The belly/curl arc must span the entire length of the center foil and appear to be a gradual arc with the deepest point no further back than 48 inches from the leading edge. As measured on a 12-inch straight edge, the belly at 6 inches from the rear of the foil may not be deeper than ½ inch. There is zero tolerance on this ½ inch depth. It is suggested that the wing blue print specify 15/32-inch depth, so that if any deflection or movement of the wing occurs, the depth will not exceed the ½ inch specification. (This ½ inch measurement ensures that the belly/curl arc is gradual.)

    -The belly/curl arc must start at the radius of the center foil’s leading edge and shall not exceed a depth of 2½ inches. Center foil thickness cannot exceed 9 inches. Center Foil top surface from side to side must remain flat. Center foil must be one-piece construction. No split or bi-wings will be permitted. Wings must be fabricated of metal alloys only. No fiberglass, carbon fiber or other similar material may be used in the basic framework of the wings. Top wing must not extend beyond outside of rear tires.

    -Two stationary foils or rudders will be allowed to run the entire length of the underneath portion of the top wing. Maximum height proportions are 1 inch at the front and 3 inches at the rear. Nowhere shall the foil exceed 3 inches in height. The top wing can be cockpit/driver adjustable

    -All side board panels must be within an eight-degree plus or minus tolerance.

    -Bracing: Side panels may not be supported by braces whose section is not horizontal. All braces or supports shall be oriented thin edge to face the air stream. Only rectangular, round or oval metal braces not exceeding 1 inch in width may be used. No aero section side panel brace material allowed. No brace or support shall resemble a wicker bill or a split wing.

    -Sideboards: Top Wing sideboards maximum size, 72 inches long and 30 inches tall. Panels must be of one-piece construction. Panels must be fabricated flat. Turnouts on all edges of the wing must not exceed 1 1/4” perpendicular to the sideboard x 1 1/4” from the rear of the sideboard forward. The entire panel must remain perpendicular to the center foil. No bending the side panel and/or moving the braces to kick out the right side panel.

    -Front wing must be made of metal alloys, max. 6 sq ft, max. 36″ wide, max. 12″ side boards with 1/2″ turn out on top & bottom of sideboards allowed.

    -A 1″ wicker bill allowed on flat or dished front wings.

    -No split or bi-wings, Gurney lips, rudders or any air flow altering devices allowed. Center Foil must be one piece. No fiberglass, carbon fiber or other similar material may be used in the basic framework of the wing.

    -Maximum distance from the center foil front edge to the front edge of the front axle may not exceed 20 inches. The center foil front edge must remain at least 1 inch behind the front edge of the front bumper. The front wing must not extend beyond outside of front tires.

    -The front wing may not be cockpit adjustable. No moving parts allowed on or in foil structure.




    -Right Rear Tire: Hoosier Racing Tire H15/ H20, medium compound.

    -Left Rear Tire: Hoosier Racing Tire H12/H15 medium compound.

    -Hoosier Racing Tires only.

    -Must run Same R/R tire that is qualified on in heat race and feature. If you run the B-Main, you may run any tire. If you advance to the A-Main you must go back to your qualifying tire.


    Race Procedures


    -Wheel packing: All cars are required to participate if the race track needs to be run in/wheel packed.

    -Race push off: You are allowed only one push off per race. If you require a second push off, you go to the tail. After drivers have been called to line up for a race, all drivers must be ready for push off or will start at the tail. If belts come loose, driver must stop by an official to buckle up and will not be penalized.


    -Running below the tires or off the intended racing surface to pass another car will result in a penalty of two positions per car passed.

    -Any car not obeying an official will be black flagged, scored last for the event, and may be subject to forfeiture of all points and payout for the event. This includes, but is not limited to, not getting in the proper position in a timely manner, stopping on the racing surface to dispute a decision, and excessive speed during yellow flag conditions.