June 25, 2024

Nostalgia Car Rules

ECHORR Nostalgia Class rules – Effective 08/15/19

Cars – General

1) Each racer may have only one car pre-inspected for the entire ECHORR Nostalgia Class event. After a car has been inspected for an event, there shall be no substitutions or replacements. The only exception to the substitution/replacement Rule is where, in the judgment of the Challenge Rules Committee or Tech Committee member(s) present at the time, extreme circumstances are present, such as where a car becomes physically unfit for participation. Such a decision lies within the sound discretion of the Committee member(s) and is final.
2). There is no weight limit for the fully assembled ECHORR Nostalgia Class car.
3) Cars should pass freely through the Official Tech Block: 1 1/8″ (1.125”).
4). Wheels and tires may protrude outward of the body.
5) Every component on the car shall meet the “On Market” requirement.


1)  Bodies shall be fashioned after a real production or prototype car.
2)  Bodies must be manufactured by either the process of casting or injection molding and be made of resin or plastic. No feather-light resin allowed. The minimum weight with 2 body screws is 2.4 grams.
3)  Bodies may be lowered and lightened as long as the minimum weight requirement is met.
4)  Bodies that have a separate roof and windshield casting/molding, and have molded-in interiors (also known as Hardtops, e.g. Aurora’s ’65 Mustang), may completely remove the interior portion of the body as long as the minimum weight requirement is met.
5)  Bodies must be complete with full windows, bumpers, drivers, roll bars and other accessories which accompanied the car as originally manufactured.
6)   Bodies must contain the original two screw posts. The original position of screw posts must remain intact and shall not be relocated to suit a different setup or wheelbase. Further, the posts shall be included and designed as part of the body specifically for mounting to an Aurora Thunder Jet Chassis.  Body posts may be repaired with plastic material only.
7)   Body must be fastened securely to the chassis using two screws.
8)   OEM wheelbase must be maintained.
9)   Windows must completely fill window opening in the front. Rear windshields are optional. Windows may be fashioned out of lexan or any other plastic and must fill the complete front and rear windshield cavities. Windshields made form Testor’s Window maker are not allowed.
10)   No Indy style Formula 1 or Formula style open-wheel bodies will be allowed.
11)   Wheel wells may be ground down for tire clearance only and must not distort the general appearance of the car.

New Bodies must be approved by ECHORR no later than 60 days before the ECHORR Challenge.


1)  Chassis shall be stock Aurora Thunder Jet with all copper components. Re-Rivoting of chassis is allowed.
1a)Solid rivet chassis may have brass or silver color rivets, any original combination is allowed.
2)   Brush springs shall not be modified in any way. They may be adjusted only in their original configuration to change the tension on the brushes.
3)   Guide pins shall be original design, must use a full guide pin, guide pin hole may be countersunk for body screw. They shall not be metal.
4)   Guide pins may be glued to chassis.
5)   Guide pins may be shortened in length to accommodate different tracks.
6)   Two mounting screws shall be used to hold the body securely on the chassis.
7)   The gear plate clamp may be bent (but not cut or otherwise altered) to improve fitment.
8)    NO trimming of the top gear plate shall be allowed.

9)    Idler gear post may be squished.

10) All Chassis holes may be peened.



Pickup shoes and springs

1)    Effective 07/01/24 Any stock replacement shoe other than flat ski shoes is allowed, i.e. Wizzard pre bent, slot tech, bsrt 504 etc.
1a)  Springs must be original Aurora, American Line, Model Motoring, BSRT (t-jet springs only) or Dr. Oogan, Wizzard and Champ.
2)     Pick up shoe springs may be cut (coils removed) to desired length.
3)     Pick up shoe springs may be stretched to desired length.
4)    The pickup shoe may be bent, but only for the purposes of adjusting the original contact area to accommodate different rail heights of the various tracks.
5)     Pick up shoe travel may only be adjusted by 1) bending the front “window” portion of the shoe that hooks to the front of the chassis, 2) bending the rear hook which attaches to the chassis’ copper hardware, or 3) bending the hangers on the chassis into which the rear hook of the shoe connects. 4) By using tape or heat shrink tubing on the front window of the shoe.
6) The window of the shoe cannot be part of the contact patch.


1) Magnets shall be manufactured by Aurora and originally supplied with the Thunder Jet chassis. Effective 07/01/24 Os3 Red Dragon are allowed in this class.

No tough ones or AFX magnets allowed. AFX magnets can be distinguished by cut marks on the bottom of the magnet.
2)  Magnet combinations allowed are green/white, green/orange, black/black and black/ black with white stripe, No tough one or AFX magnets allowed.
3)   Magnets may be shimmed using non-ferrous materials only.
4)   Magnets may be matched.
5)   All paint on magnets shall have original factory paint.  There shall be no substantial removal of paint. In the event of paint shortage on the magnets, they will be compared to magnets in the official tech kit and if still in question they will be measured for strength against like magnets by the designated measuring tool for the event.
6)   Painting of magnets shall not be allowed.
7)   No “reversed zapped” magnets.
8)   Magnets may not be sanded at all in this class.

See Magnet guide: http://slotmonsters.com/slot-car-pancake-motor-magnets.ashx

No “reversed zapped” magnets..


1)    Only original, stock armatures, with gray tips shall be allowed.
2)    Armatures shall average 16 ohms or greater across all poles.
3)    Armatures may be balanced, but not trued. The use of glue between comm plate gaps is not allowed in this class.
4)    No Hand Wound or rewound or de-wound armatures allowed. The tech committee will have privy to comparative arms and other hand wound detecting tools to make an intelligent decision on a case by case basis.

Shims between the armature and top plate are not allowed.

Commutator Brushes 

1)    Commutator brushes shall be manufactured of a copper/carbon compound.
2)    Both the top and bottom surfaces shall remain flat.
3)    Replacement brushes must meet ECHORR required “On Market” definition requirements.
4)    Commutator brushes may be lightly scored to prevent rotation.
5)    No “dimpling” of the brush tensioners allowed.


1)    The armature pinion, idler gear and driven gear shall be brass, with top plate gears at a minimum thickness of .046.
2)    The armature pinion gear shall have 14 teeth.
3)    The idler gear shall have 24 teeth.
4)    The driven gear shall have 24 teeth.
5)    The final pinion shall have 9 teeth.
6)    The Crown gear shall have 15 teeth and must maintain its original shape, no re-shaping of the gear boss, 4 gear specialty chassis crown gears are not allowed.
7)    The Crown gear shall not be metal.
8)    The Crown gear shall not be shimmed.
8a)  The Crown gear minimum diameter will be no less than .300
9)    Gears may be soldered or glued to their respective shafts. Gear shafts will be magnetic.
10)  Gears may be lapped and/or polished. They shall not be beveled.
11)  Shims between the gears and top plate are not allowed.
12)  Hollow cluster shafts are not allowed.

13) Lightened gears are not allowed.

Plastic top plate gears are not allowed.


1)    All tires shall be slip-on tires equal to or greater than 0.350″ diameter and a maximum width of .120.
2)    Tires may be made of silicone.
3)    Re-coating of the tires is not allowed, this will be looked at carefully during pre-tech.
4)    Replacement wheels may be double flanged and may be of the screw on or pressed on variety.
5)    Axle nuts, spacers or springs shall be kept on the outer side of the chassis.
6)    Spacers shall be made only of plastic, copper, aluminum, brass, or steel. (Outside diameter cannot exceed 0.125 +/- .005)
7)    No wheel weights or hub caps of any kind allowed on rear end.
8)    Axles shall not exceed 1-1/8” in length. Any axle may be used.
9)    All four tires shall simultaneously touch the test track in the static position.
10)  Lateral movement of the front tire/axle assembly shall not exceed 1/32″ (.03″)
11)  Any tire/hub combination may be used for front and/or rear. Tires may not exceed standard replacement width for acceptable after market narrow tires i.e., Thunder Slicks, Black Hawks, Heister’s, Super Tires etc.
12) Any commercially available weighted front end is legal as long as it meets the 1 and 1/8 width requirements and the .350 tire height requirement, examples are ZoominMotorsports front ends for classic cars ,RTHO 1 and 1/8th front ends, JW 1 and 1/8th front ends,etc.  All new front ends must be submitted to ECHORR at least 60 days prior to the Challenge.

No mixing and matching of front end parts from different manufacturers. This does not apply to tires and o-rings.

No “one of” Parts allowed on the cars.

A Final Rule:

If anything is not specifically stated or addressed in the above rules it is NOT permitted.