Rules · Slot Cars

Slot Car Rules

Track rules updated February 8, 2025

These rules apply to all slot car races at Lanes Raceway, along with the General Rules. Jump to: Track rules · Box Stock GRC/FCR · Fairview IT Management Cup · Flexi Challenge (DTM, LMP, GTP)

Track rules

Everyone in the race must turn marshal when sitting out. You may only work on your car during the 2-minute lane rotation. During your sit-out, your car must be in the designated area while the race is running. If you don't turn marshal, 50 laps are deducted for each heat you miss. All racers and the track director should enforce this rule.
2-minute heats.
2-minute lane rotations. During the 2 minutes you may work on your car at your pit area. All cars should be on the track before the timer ends. The timer is displayed on all TVs during the race. Sit-outs must have their car in the designated area and be ready to turn marshal before time expires. A 50-lap penalty applies if your car is not in the window.
Sit-out stickers. Place an identifiable sticker on the side of the track when you sit out, or when you finish the race with heats left. This is required if you are on the same lap as someone else. If there's no sticker on the track, you'll be scored at the start line of the lap you're on.
Track timer. The timer will only be delayed if someone is in the bathroom or for a fast gear adjustment (30 seconds). We won't wait on extensive repairs; you may put your car back on the track once your repairs are made.
Track calls will be kept as minimal as possible.
Driver track call buttons. When a driver presses the button, ALL cars that are off the track will be placed directly in front of the lap counter. If a driver presses the button while their own car is on the track (a false track call), that driver's car will be placed directly in front of the lap counter.
No running. No fighting. This is a hobby, so just have fun.

All sections may have additions or changes. If you have a suggestion for the rules, please let us know.

Box Stock GRC/FCR Class

Motor

Mid America Stomp/GRC motor only

Chassis

Mid America 4½" GRC or Parma 4½" FCR chassis only
1/8" solid steel rear axle; no hollow axles
48 pitch straight pinion and 48 pitch plastic crown gear: 29-tooth gear and 9-tooth pinion
May run any height guide flag, shims, nut and approved braids
Bushings may be soldered in
Oilites only; no bearings
No lead allowed
No bracing on the front and rear uprights or the motor mount
No offset; wheels must be even in the chassis
No free-wheeling the front; the front must be locked
No excessive chassis contact with the track

Tires

Mid America 1/8 Standard Hub Tire (MAR84F) or Koford 1/8 Fish Tires (KOF229)
No minimum size, as long as minimum chassis height is maintained
Tires may be changed, even during the race, but must pass the tech tool for height (.047") and width (83 mm / 3.268") and be approved by the Race Director
Rear tire width must pass the 83 mm (3.268") tech tool at all times before, during and after the race

Body

Mid America GRC body or Parma FCR body only; truck body OK
Must be painted and numbered
All bodies must have 1/16" front and rear bumpers
Body proofing or tape may be used for inner strength; no outer aerodynamic improvements
No heating, pinching or reforming bodies for aerodynamic purposes
No cutting out windows or open holes in the body
Body must be mounted as the manufacturer intended, to look like a real race car

Fairview IT Management Cup Series

Motor

Stock legal motors: JK Hawk 7, Mid America Eagle, ProSlot 4002FK, 16D motor
May change springs and brushes

Chassis

Mid America Turbo Flex 4" flexi stamped steel chassis
1/8" or 3/32" solid steel rear axle
Any pitch straight or angle pinion and any pitch plastic spur gear
May run any height guide flag, shims, nut and approved braids
The .047" tech tool must clear the gear and the rear of the chassis
Axle bushing holes may be altered to lower or raise the bushings; bushings may be soldered in
Bearings allowed
No excessive chassis contact with the track

Tires

Any rear tires; no minimum size, as long as minimum chassis height is maintained
Tires may be changed, even during the race, but must pass the tech tool for height (.047") and width (83 mm / 3.268") and be approved by the Race Director
Rear tire width must pass the 83 mm (3.268") tech tool at all times before, during and after the race

Body

Any 4" NASCAR body approved by the appointed Race Director
Must be painted and numbered
All bodies must have 1/16" front and rear bumpers
Body proofing or tape may be used for inner strength; no outer aerodynamic improvements
No heating, pinching or reforming bodies for aerodynamic purposes
No cutting out windows or open holes in the body
Body must be mounted as the manufacturer intended, to look like a real race car

Flexi Challenge Series: DTM, LMP, GTP

Our Flexi Challenge rules are based on the FNRS rules. Anything not covered here conforms to the FNRS basic rules. Classes run: JK Wide Indy / LMP, DTM and GTP. Follow the series on Facebook.

Chassis components must be commercially available at least 30 days before the first race of the season; anything released after that is considered for the following season. We reserve the right to exclude any product that may be deemed detrimental to the series and/or its supporters and racers.

Chassis

Any 4" stamped steel 2- or 3-piece chassis. A chassis has a minimum of two and a maximum of three parts: one solid center section and up to two separate pans. Two-piece center sections are not allowed. The part of the center section the motor attaches to must be steel; pans may be steel or aluminum. No homemade, carbon fiber, plastic, molded or printed parts.

Chassis blanks may be cut by laser, EDM, water jet, mill or die stamp. All axle uprights, motor brackets, guide tongues, body clip mounting holes, etc. must be formed by stamping the center section and pans. Spring steel solder-together chassis are not allowed. The chassis may not exceed 83 mm wide at any point.

May use lightweight replacement pans and center sections.
May interchange parts from a single manufacturer, such as Flexi and Flexi-2 parts, JK long or short center sections, and heavy or light pans on JK, Champion, Parma and Mossetti chassis.
No modifications except the following:
May solder or glue the motor, axle oilites/bushings and front wheel retainers.
May add lead weight and/or strapping tape to the chassis.
May file holes in the motor bracket for better gear mesh, but must keep part of the motor bracket.
No oilite/bushing modifications. Offset oilites/bushings allowed. No ball bearings.
May add spacers between the pan and center section.
May add a 1" (25.4 mm) long motor brace and up to two upright braces (one per upright).
Original manufacturer plating may be removed only where soldering.
May add pin tubes in the stock holes/location; solid or floating. May add a lead wire retainer.
May change the stock bite bar to a steel bar of .039" to .062" diameter: straight, round, no bends or flats, and not deviating from stock. The bite bar may not be soldered to the center section or pans.
Overall width maximum 83 mm (3.268").
May solder on a steel guide tongue reinforcement, but the original tongue may not be removed, modified or moved.
No other modifications, soldering, cutting, grinding or bracing.
May use any guide, nut, spacers, lead wire and clips. One guide flag per car. No magnet wire.
May reasonably file the rear oilite/bushing chassis holes for axle alignment.
Mossetti chassis: must use either an unmodified .062" brass tube or the M-1052 .064" stainless tube only, retained with push/body pins. The MR-1051 chassis retaining clip may be used but not modified or soldered to the chassis.
Front axles and front wheels are not required (see class specifics for JK Wide Indy). Front wheels, if used, must be at least .675" O.D. Front axle diameter .093" to 3/32"; it may be soldered to the center section uprights.

Motors and gears

Approved motors: TS Intimidator, TS Intimidator BB, RTR Raptor Pro, PS Speedball, MA Enforcer (see class specifics for which motors each class allows).

Allowed modifications: trim the pinion shaft. The can may be notched on the axle side for slight axle clearance only. No other motor modifications.
Clip-on heat sinks, or screw-on heat sinks that attach to the can on the pinion side, are allowed. Comm coolers allowed.

Pro Slot Speedball

Motors must be factory sealed, using the unmodified factory seal only. Clear fingernail polish may be added to extend seal life; no other seal modifications.
Brushes and springs may be changed. Only 3-coil replacement springs. Any 36-D size brushes; brushes may not be cut, slotted or modified on the commutator face, but may be radiused before break-in.
No spring insulation or shunt wires.
Super glue may be added to the endbell bushing; the can oilite may be soldered in place. Armature shafts may be cut on both sides.
Motors may NOT be rebuilt.

Gears

64 pitch only, any brand.
Any size 64 pitch plastic spur gear; it must clear the track by .047". No metal spur gears.

Wheels, tires and axles

Rear

Black rear tires/rubber only. No dyed tires. No speed rubber.
Wheels/tires may not be wider than .815". Maximum hub diameter .625".
Axles minimum 3/32" diameter. Drill blanks allowed. No hollow, non-steel or lightweight axles. Axle flats for gear/tire set screws allowed.

Front

Front wheels and tires are optional (except JK Wide Indy). If used: minimum .675" O.D. with rubber, minimum width .250". Fronts don't have to touch the track.
Front axle diameter .093" to 3/32"; one piece, solid steel. May be soldered to the front uprights; wheel retainers may be soldered.

Also

Car width maximum 83 mm.
No lightened drivetrain, including but not limited to drilled, hollow or lightweight axles, drilled hubs or drilled gears.
No ball bearings in the chassis, wheels or axles.

Clearance

Rear clearance is .047" minimum, including the spur gear. It is measured under the rear of the car, directly under the rear axle and between the rear wheels, with the car at rest on a flat tech block and the guide in the tech block slot.
Clearance is checked at the start of the race, with no check at the end. If a car is suspected of dragging during racing, the Race Director may check clearance. Any car found dragging will be repaired under green flag conditions.
The tech director/race controller may do a mid-race clearance check at the start of any heat. Any car with less than .039" rear clearance at the start of a heat must change tires and be rechecked under green flag conditions.

Bodies

Bodies must be fully painted and opaque. Sides may be left clear in the body pin/clip area only. Must have three numbers. All windows must be clear.
Tape, lexan or mylar may be added for reinforcement but may not extend beyond the body.
No added air control, spoilers or diaplanes.
Looking straight down at tech, the body must completely cover the chassis and tires, except the front chassis wings.
The blade of the guide flag may extend past the front bumper/nose. No braid, clips or top of the guide may be visible.
No cutting into the top surface of the body. The rear bumper/valance may be cut out or removed.
No rear body height requirement in any class.
Front wheel area: use sticker fronts if no front wheels are used. If front wheels are used, the openings must be clear or cut out, with 50% of the front wheels visible.
We reserve the right to reject any body at tech that doesn't meet these requirements.

Class specifics

JK Wide Indy

Chassis: JK Wide Indy C35 (JK 251172)
Front wheels required: stock JK fronts or a reasonable likeness, minimum .680" diameter × .250" wide
Pinion: 11-tooth 64 pitch maximum; any tooth 64 pitch spur
Motor: TS Intimidator, TS Intimidator BB, RTR Raptor Pro
Body: JK Wide Indy, Kelly Evolution KE1841, Betta Honda (Project X), RTR Indy Dallara i18

4" LMP

Same chassis rules as DTM and GTP
Pinion: 11-tooth 64 pitch maximum; any tooth 64 pitch spur
Motor: TS Intimidator, TS Intimidator BB, RTR Raptor Pro, MA Enforcer, PS Speedball
Body: any JK LMP, RTR Orca (both versions), Kelly Eagle, MA Toyota WEC (traditional wing)

4" DTM

Pinion: 11-tooth 64 pitch maximum; any tooth 64 pitch spur
Motor: TS Intimidator, TS Intimidator BB, RTR Raptor Pro, MA Enforcer, PS Speedball
Body: any readily available DTM body, except O/S or similar lower-profile bodies. It must generally look like USRA and ISRA Production bodies; RTR and Kelly both have acceptable options. For a non-mainstream body (not available at distributors), contact us ahead of time for approval.

GTP

Pinion and spur: any tooth, 64 pitch
Motor: any approved motor listed above
Body: RTR Viking, Renegade, Warrior or Revolution; Kelly Hawk or Falcon; O/S B3 363