Local Rules for Iowa Mini-Z Racing
Iowa Mini-Z Racing rules will be based off of the following 28thSRA rules that you can find here.
Other racing clubs rules may vary.
Iowa Mini-Z Racing has created a rules board that consists of 5 members from multiple clubs.
Members are Nick Williams–Cedar Rapids, Chris Simmons–Cedar Rapids, Don Drozd–Omaha, Gerry Burr–Omaha, Jake Tuel–Des Moines.
Classes
Box Stock
OVERVIEW: Stock unaltered MR03-04 Mini Z as from ReadySet Box.
Gearing must be out of RedySet Kit.
Motor
- Unaltered “white cap” motor
- Capacitors and PTC must remain on the motor
- Motor wires MAY be changed for silicone-insulated replacements
Batteries
- ORION 900HV NiMH (ORI13202)
Electronics
- Stock ReadySet board or direct replacement
- Any radio that will bind to stock Kyosho electronic board.
Drivetrain
- Unaltered gear diff – final gearing to be determined by race director
Chassis/Suspension
- Unaltered chassis
- Unaltered Motor Pod
- Unaltered Front Springs
- Unaltered T-Plate
- Unaltered Top ‘Shock’
- Unaltered Top Spring
- Unaltered Repair/Replacement parts ONLY from stock
Body and Wheels
- Any Auto Scale and Auto Scale like body
- Not allowed the Jomurema body and PN Concept and Reflex – any questions refer to race director
- All bodys must have all major body parts including headlight lenses and buckets
- For the MRO3 the kingpin flip is allowed as long as it’s trimmed to not damage the track
Tires
- Open to any RCP safe tire
- Open 11mm wide tire for rear. Open to any 8.5mm wide for front.
- Tire Prep/Compound/Sauce/’Wash’ Prohibited
- Tire Cleaning Allowed With Pure Water, Isopropyl Alcohol, or using Tap Water
Kyosho Cup
Overview: One-Make Class, Similar To (but not the same as) Kyosho’s Wide Touring
Class. ALL PARTS MUST BE MANUFACTURED BY KYOSHO or R246
Motor
- Unaltered “Black Cap” motor Required (Kyosho MZW301 or MZW301E)
- Capacitors and PTC must remain unmolested
- Motor wires MAY be changed for silicone-insulated replacements
Batteries
- 4x AAA NiMH, Max Voltage 1.55V each, Max 6.2V Total
- Any Brand/Model
Electronics
- Any Kyosho Manufactured Evo or Box-Stock Board
- Transmitter: Open
Drive-train
- Kyosho Manufactured Gear or Ball Differential with 0.5M 44T Spur
- Kyosho Manufactured 6T 7T, 8T, or 9T Pinion
Chassis/Suspension
- Kyosho MR03 Chassis (Kyosho MZ501 or MZ501SP)
- Any Kyosho or R246 Manufactured Motor Pod
- Any Kyosho or R246 Manufactured Springs, T-Plates, Dampers
- Any brand of brass chassis weights are legal
Body
- Any Kyosho ReadySet OR MZP* Auto Scale body MZN* White-Body kit:
- Windshield, Headlight lenses and Taillight lenses are required
- Lexan Windows and Roofs are not permitted.
Tires and Wheels
- Front Wheel must Measure 20×8.5mm.
- Rear Wheel must measure 20×8.5 or 20x11mm
- Any RCP-Safe tire is Permitted
- Front Tire Height <21.9mm and >24.7mm
- Rear Tire Height not to exceed 24.7mm
- Tire Prep/Compound/Sauce/’Warsh’ Prohibited
- Tire Cleaning Allowed With Pure Water, Isopropyl Alcohol, or using Tap Water
- Hop Up/Option Parts:
- ANY KYOSHO or R246 Manufactured Upgrades are Permitted
AAA NiMh Sportsman
Minimum fast-lap
Driver and Car may be required to demonstrate competence to lap the track within 1.2x the class-record in order to race in this class (example: if the class record is 6.1 sec then the driver must be faster than 6.1 x 1.2 = 7.32 sec).
Motor
- 3500kv Brushless motor
- Kyosho Black Cap motor
- PN70 turn
- Must Tech Below 3800kv using SKYRC Motor Analyzer
Batteries
- AAA NiMH batteries only, 4-cells in series only. 6.2v total maximum voltage
ESC
- Open
Drive train
- Final Drive Ratio: Open for the PN70 turn
- Gearing for the 3500 motor is 14 pinion and 53 Spur
- Kyosho Black Cap must run Kyosho gearing
Car Dimensions
- Wheelbase not to exceed 102mm
- Tires must not protrude beyond body work
Body
- 1:27-28 Scale Hard Body 98-102
- Lexan body prohibited
- Lexan replacement windows and Lexan roofs are permitted
- Body must have headlight lenses and windows installed
Tires
- Front Tire Width not to exceed 8.5mm
- Rear Tire width not to exceed 11mm
- must be approved for use on RCP
- Silicone Tires Prohibited
- Foam Tires Prohibited
- Tire Prep/Compound/Sauce/’Warsh’ Prohibited
- Tire Cleaning Allowed With Pure Water, Isopropyl Alcohol, or using Tape
AAA NiMh SuperGT (5500kv motor)
Minimum fast-lap
Driver and Car may be required to demonstrate competence to lap the track within 1.2x the class-record in order to race in this class (example: if the class record is 6.1sec then the driver must be faster than 6.1 x 1.2 = 7.32sec).
Motor
- 5500kv Brushless motor.
- Must Tech Below 5800kv using SKYRC Motor Analyzer
Batteries
- AAA NiMH batteries only, 4-cells in series only. 6.2v total maximum voltage
ESC
- Open
Drivetrain
- Final Drive Ratio: Open
Car Dimensions
- Wheelbase not to exceed 102mm
- Tires must not protrude beyond body work
Body
- 1:27-28 Scale Hard Body 98-102
- Lexan body prohibited
- Lexan replacement windows and Lexan roofs are permitted
- Body must have headlight lenses and windows installed
Tires
- Front Tire Width not to exceed 8.5mm
- Rear Tire width not to exceed 11mm
- must be approved for use on RCP
- Silicone Tires Prohibited
- Foam Tires Prohibited
- Tire Prep/Compound/Sauce/’Wash’ Prohibited
- Tire Cleaning Allowed With Pure Water, Isopropyl Alcohol, or using Tape
Lipo Stock (2500KV Hard Bodies) **Check for Updates**
Minimum fast-lap
Driver and Car may be required to demonstrate competence to lap the track
within 1.15x the class-record in order to race in this class (example: if the classrecord
is 5.9sec then the driver must be faster than 5.9 x 1.15 = 6.79sec)
Due to manufacturing QC issues from NHXwe will be using 28th SRA rules for the 2500 Lipo Stock Class.
Motor
- Any 1/28th scale manufacturer 2500Kv sensored motor
- Maximum can diameter: 15mm
- Maximum Kv: 2800
- No aftermarket rotors allowed
- Motors must not be tampered with or modified
Batteries
- Any 2 battery combo max racing voltage 8.4.
ESC
- Hobby Wing
- Nhx
- Rocket
- Must have 0 timing ie “blinking mode”
Drivetrain
- RWD
- 53T spur with a 14T pinion ≈ 3.786:1
Car Dimensions
- Maximum Width 80mm, Maximum Length 160mm
- Wheelbase not to exceed 102mm
- Minimum race weight 160 grams
- Tires must not protrude beyond body work
Body
- Any Kyosho, Jomurema, Silver Horse, PN, or TRP Hard Body
- Minimum weight: 26g (not including mounting system)
- Lexan Windows and Lexan Roofs are permitted
Tires
- Tire width not to exceed 11mm
- must be approved for use on RCP
- Silicone Tires Prohibited
- Foam Tires Prohibited
- Tire Prep/Compound/Sauce/’Warsh’ Prohibited
- Tire Cleaning Allowed With Pure Water, Isopropyl Alcohol, or using Tape
2500 Open
Minimum fast-lap
Driver and Car may be required to demonstrate competence to lap the track
within 1.15x the class-record in order to race in this class (example: if the class record
is 5.9sec then the driver must be faster than 5.9 x 1.15 = 6.79sec)
Motor (2s LiPo, LiIon)
- 2500kv Brushless Motor.
- Must Tech Below 2800KV
Batteries
- Lithium Polymer or Lithium Ion batteries wired in 2s, or 2s,2p, for a maximum
total voltage of 8.40v
ESC
- Open
Drivetrain
- RWD – Open Drive Gearing
Car Dimensions
- Maximum Width 80mm, Maximum Length 160mm
- Wheelbase not to exceed 102mm
- Tires must not protrude beyond body work
Body
- Any Pan Body or LMH Lexan Body permitted
Tires
- Tire width not to exceed 11mm
- must be approved for use on RCP
- Silicone Tires Prohibited
- Foam Tires Prohibited
- Tire Prep/Compound/Sauce/’Warsh’ Prohibited
- Tire Cleaning Allowed With Pure Water, Isopropyl Alcohol, or using Tape
Super Stock 3500 lipo
Minimum fast-lap
- Driver and Car may be required to demonstrate competence to lap the track
within 1.15x the class-record in order to race in this class (example: if the classrecord
is 5.9sec then the driver must be faster than 5.9 x 1.15 = 6.79sec)
Motor (2s LiPo, LiIon)
- 3500kv Brushless Motor.
- Must Tech Below 3800KV
Batteries
- Lithium Polymer or Lithium Ion batteries wired in 2s, or 2s,2p, for a maximum
total voltage of 8.40v
ESC
- Sensorless ESC: Open
- Sensored ESC: No Turbo or Boost Timing permitted (Must be in ‘Blinky Mode’)
Drivetrain
- RWD
- 53t spur with a 12t pinion ≈ 4.42:1
Car Dimensions
- Maximum Width 80mm, Maximum Length 160mm
- Wheelbase not to exceed 102mm
- Tires must not protrude beyond body work
Body
- Any Lexan GT or Sedan Body permitted
- LMP and Pan-Car style Bodies prohibited
Tires
- Tire width not to exceed 11mm
- must be approved for use on RCP
- Silicone Tires Prohibited
- Foam Tires Prohibited
- Tire Prep/Compound/Sauce/’Warsh’ Prohibited
- Tire Cleaning Allowed With Pure Water, Isopropyl Alcohol, or using Tape
Modified AWD
Minimum fast-lap
Driver and Car must be able to lap the track within 1.15x the class-record in order
to race in this class (example: if the class-record is 6.1sec then the driver must
be faster than 6.2 x 1.15= 7.13sec).
Motor
- Open Brushless Motor (Modifications Prohibited)
Batteries
- Lithium Polymer or Lithium Ion batteries wired in 2s, or 2s,2p, for a maximum
total voltage of 8.4v
ESC
- Any Sensorless Brushless system permitted
- Any Sensored Brushless system permitted in ‘blinky mode’ (no boost or turbo
timing)
Drivetrain
- Shaft or belt driven AWD
- Final Drive Ratio: Open
Car Dimensions
- Max Width: 80mm
- Max Length: 180mm
- Max Wheelbase: 98mm
- Tires must not protrude beyond body work
Body
- GT-Style Lexan or Kyosho-Style Hard-Body
Tires
- Tire width not to exceed 14mm
- must be approved for use on RCP
- Silicone Tires Prohibited
- Foam Tires Prohibited
- Tire Prep/Compound/Sauce/’Warsh’ Prohibited
- Tire Cleaning Allowed With Pure Water, Isopropyl Alcohol, or using Tape
Formula 1
Chassis
- Any Formula 1 Racing Chassis, such as GLF-1, MWX Formula 1
Motor
- 2500kv Brushless Motors
- Must test @ 2800KV or below in accordance with test procedures provided by race director.
Batteries
- Lithium Polymer batteries wired in 2s: maximum total voltage of 8.4v
ESC
- Any Sensorless Brushless system permitted
- Any Sensored Brushless system permitted in ‘blinky mode’ (no boost or turbo
timing)
Drivetrain
- Final Drive Ratio: 53:13 ≈ 4.08:1
Car Dimensions
- Overall Width: Not to differ from stock
- Wheelbase: 114.0 ± 1 mm
- Overall Length: Within 3 mm of stock
Body
- Body Kit: GLF-S-001
- Alternate front spoiler and/or rear wing are acceptable provided they adhere to
the following: - Cannot cause the car’s overall length to violate 7,H,iii
- Mounting to the same point as stock parts,
- Front Spoiler max height not to exceed 12mm
- Rear Wing Max Height not to exceed 50mm
- Total Combined Frontal Area of all alternate or altered parts are not to
exceed 2500mm2 - Total Combined Wetted Area of all alternate or altered parts are not to
exceed 10000mm2
Wheels and Tires
- Front Wheel: GLF-S-003
- Rear Wheel: GLF-S-004
- Front Tire: GF0001-S21, GF0001-S23, GF0001-S25, or GF0001-S27
- Rear Tire: MZR-V1R05-F1-GL or MZR-V1R10-F1-GL
- Tire Prep/Compound/Sauce/’Warsh’ Prohibited
- Tire Cleaning Allowed With Pure Water, Isopropyl Alcohol, or using Tap
General Rules
Tires
All Classes
- RM Spec, AAA Stock, LiPo Stock, F1, and 3500 GT, maximum tire diameter while mounted on the wheel is 25.5mm.
- Older F1 tires are not allowed, unless the sidewall is cut off. Exception is F1 and LMP / LMH Classes.
- Any brand of production rubber 28 scale tire is allowed.
- Traction Compound is NOT allowed on the tire or race surface.
- Tire warmers are allowed.
- Tires may be cleaned with a 70% alcohol solution or water.
- If a driver uses a tire cleaner deemed illegal, the driver will be subject to penalties.
- Homemade tires, Foam tires, Silicon tires, Urethane tires, or Ethyl Carbamate tires are NOT allowed.
- Tire inserts are not allowed.
Please address any questions concerning tires at the driver’s meeting or with the race director.
Body & Modifications
Hard Bodies
Bodies may be functionally modified with minimal effect on the external appearance. The following non- comprehensive list of body modifications is allowed.
- The rear bumper may be removed up to a maximum of 20mm from the ground. Wheel wells may be cut or chamfered internally for tire clearance.
- Lower portions of the body may be cut for ground clearance in front, sides, or rear.
- Body panels may be reinforced or strengthened internally without affecting external appearance.
- Original headlight covers must be installed, but headlight buckets may be removed or omitted. If a headlight cover is lost, the hole may be covered with a decal.
- Taillights and taillight covers may be removed or omitted.
- Small body parts such as mirrors, canards, exhausts, and front splitters may be omitted or removed to prevent racing damage, getting stuck under a rail, and debris on the track.
- All rear wings that come standard with their corresponding hard-shell body may be used with no height limit. Custom-manufactured aftermarket plastic wings are allowed on any shell but must be cut to meet the height limit of 45mm from the ground.
The above list is non-comprehensive. The purpose and spirit of the rule are to allow functional performance modifications to the body while preserving the scale appearance and realism. The technical inspector has final authority in the judgment of body modification legality. If you have modified your body and have questions regarding the legality of the modifications, please submit the body in question to technical inspection PRIOR to racing qualification or main event rounds. This is to prevent any inadvertent disqualifications. The technical inspector will judge the legality of body modifications and photograph the body in its legal state if necessary.
If the body is further modified post-inspection, the modifications may or may not be legal. For the racer’s protection, please re-submit the body in question to technical inspection IMMEDIATELY if significant modifications have been made. If the body is damaged, the condition of the body may or may not be legal. For the racer’s protection, please submit the body in question to technical inspection IMMEDIATELY if significant damage occurs. If the damaged body is judged illegal, it must be repaired or replaced for the next qualification or main event round. Qualification or main event results during which racing damage occurs on track will be allowed, as long as the body is not judged to be intentionally designed to break away to benefit performance.
Lexan Bodies
Aftermarket Lexan, molded plastic, 3d printed, and carbon wings are allowed. Maximum wing size cannot be bigger than the original wing cutting line. The rear bumper may be removed up to a maximum of 20mm from the ground.
Approved Lexan GT Bodies
- PN – Supra A90, JSK, AD4, GT4LB, 992GT3, M4GT3, Concept C9, V2 JGT01, ZLB
- SBRC – Zenvo ST1, Phenom GT, NSX GT3, 458GT, SBX, STR, HYR, JX, XB2,
- Marka – RK410, RK408, RK-S, RK-SP6, RK-HC, RK-P-One, RK-W, RK-12, RK-TWR, RK-4C, RK-AMGT, RK-BLD, RK-NTI, RKPZR, RK-MK4
- Atomic – M4Z, DBX, Hyper, VST, ADR, IS2, LTC Type, LCT-2.0, AMZ
- GL Racing – P1M
- Rad Body – Mako GT, Mako X, Catfish
- PROTOform – P63, Venturi GT
- G-Force VW
- RTRC – XVR-GTB
- Bitty Designs – Ares-1, Eptron
- Nexx Racing – NX-326 Body
- GL Racing – P1M (102mm)
- Marka – RK-P-One (102mm)
- RTRC – XVR-GTB (102mm)
Approved Lexan Pan Car and LMP Bodies
Cutting the rear panel is allowed.
- PN – BMR, AMR2
- Marka – RK-AMR, RK-P99, RK-LM6
- Atomic – MP1
- SBRC – B001, B011
- Rad Body – LMP3, Ocho, Skillet
- Atomic – MRZ (102mm)
- GL Racing – VDS (102mm)
Approved Lexan 112mm -116mm bodies
F1
- GL Racing – GLF-1
- PN – F1 body #600821
- G-Force – G-Force formula body
LMP/LMH
- GL Racing – GLF1 LeMans
Because a body isn’t listed above doesn’t mean it’s not allowed. Check with the race director before the event to get a final answer on whether your particular body is allowed or not.
Prototype and 3D Printed Parts
Any production or 3D printed parts not publicly available before the start of an event, are considered prototype parts. Any new parts must be publicly announced via social media or website and be available for purchase on a national scale to be considered publicly available. 3D print files shared with the public 30 days before the start of an event, and can be printed by the public, will meet the requirement of being publicly available for that particular part.
Sportsmanship
- Proper manners and good sportsmanship are expected from all drivers at all times. It is important to understand that general bad behavior like cursing, intentional bad driving, etc. will not be accepted and can result in a driver being penalized, disqualified, or even asked to leave in extreme cases.
- All participants will be expected to attend the drivers’ meeting. Drivers will be expected to understand and comply with each rule by the time they leave the driver’s meeting. Ask any questions at this time.
- If there is a rule dispute between drivers it must be brought to the attention of the race director or race personnel. The officials at the track will do their best to resolve any issue to the satisfaction of everyone.
- If a racer notices an illegal item on another racer’s car. Please report to the race official after that racer’s race, so the car can be inspected without interference.
- Substitute drivers are not allowed in any qualification or main event race. Immediate disqualification from the event for both drivers will result.
Race Tech
Motor
Motor tech procedures
All motors to be ran in AAA Stock, LiPo Stock, F1, LMP/Hypercar, and 3500 GT classes must be Pre-Event teched and marked for motor rule compliance.
- Motor must be unsoldered, and sensor wire removed before handing it over to the tech official
- The motor will be teched for Kv using a SkyRC Motor analyzer (SKY-500020)
- SkyRC Motor analyzer will be powered using a 72 watt variable power supply set to 8.4 Volts (SHNITPWR)
- SkrRC analyzer will be set to the first option, Kv analyzer, power knob will be turned to full throttle level (all lights lit)
Car Tech
Race Director or Technical inspector can tech any car at any time without reason.
Pre-Event Tech
Pre-Event is considered, any time prior to the first race of the event. Every driver can submit his car for pre-event tech to make sure they are in compliance with the rules. All Stock, F1, and 3500 GT entries must Pre-Event tech the following items, all motors, pinion gears, and spur gears to be ran in the event. Those items will be marked for easy Pre-Race tech.
Pre-Race Tech
All cars must be teched prior to each race it is in. Drivers will present their car to the technical director at least 3 minutes prior to the previous race being completed. Car must be turned off with body removed for the initial tech. Technical director may ask you to turn on the car during their inspection.
Post-Race Tech
All Cars must be placed on the post-race tech table after each run. Car can be either left on or turned off before placing on the post-tech table. Car cannot leave the post-race tech table until the next race is completed.
Rule Clarifications
The Atomic MRZ Pro converted to a strait axle, will be considered an MRZ.
General Rules for Iowa Mini-Z Club Racing at Wolfram RC
Thank you for joining us for Iowa Mini-Z’s Club Racing at Wolfram RC. We have a great lineup of racing ahead. Please take a moment to review these protocols to ensure the program runs smoothly and everyone has a great time on the track.
Registration & Check-In
Before the first heat, ensure you have officially registered. Please see Jim, Nick, or Matt at the check-out desk to confirm your entries, transponder numbers, and class assignments. Getting this sorted early helps us stay on schedule.
Tech Inspection & Compliance
To keep the race fair and competitive, we have implemented the following procedures:
- All cars participating in the 2500 LiPo Class must be inspected prior to their first race.
- Please bring your car to the tech station once registered.
- Random Inspections: Cars in all other classes are subject to random tech inspections throughout the night at the race director’s discretion.
Race Program
The race program typically consists of two heat races for qualifying position, followed by a main event. Heat races are 4 minutes in length and racers are scored on laps completed, and overall time. Racers are not competing for track positions in Heat races.
Main events are 5 minutes in length and feature all drivers starting on the tone. Racers are lined up based upon qualifying position, and the race is based upon track position with the first driver to cross the finish line at the completion of the time limit, declared the winner
Race Readiness
The schedule moves quickly once we start. We are typically racing on weeknights and want to get everyone home at a decent time.
Please have your car, radio, and fresh batteries ready before your race is called. When the current race finishes, the next group should be placing their cars on the grid immediately.
Marshalling Etiquette
Marshalling is a critical part of a successful race night.
- The Golden Rule: You are required to marshal the race immediately following yours. Do not head back to your pit table after your heat; go straight to a marshalling station.
- Proper Technique: When a car crashes, get to it quickly but safely. Place the car back on the track in the same direction of travel, ensuring you aren’t dropping it directly into the path of oncoming traffic.
- Stay Focused: Avoid checking your phone or chatting while on the track. The drivers on the stand are counting on you!
- Stay Safe: The mini-z track sits upon the drift track which is very slippery, so use caution to avoid slipping. Watch for cars on the track to avoid stepping on one or being hit by one. Watch where you step- the track barriers are held in place by hard plastic pieces which can be very painful to step on.
- Remove Your Shoes: To protect the racing surface, please remove your shoes before stepping onto the track. Please note that socks can be extra slippery on the drift track, and the track itself can slide on it.
Priority: Have Fun!
We are all here because we enjoy the hobby. Keep the atmosphere positive, help out your fellow racers, and let’s put on a great show.
Keeping it Classy
We’re all here to have a good time, so let’s keep the vibes high and the drama low:
Don’t Yell at the Marshals: They’re doing you a favor so you can keep racing. If you’re upside down, it’s probably not their fault. Be patient and give them a “thanks” when the race is over.
The “Give it Back” Rule: If you accidentally punt someone or take them out, play fair. Pull over, let them get back in front of you, and then get back to the battle. It’s way more fun to win a clean race.
Lapped Traffic: If the leaders are coming up behind you, don’t panic. Just stay on your line and be predictable—they’ll find a way around. Leaders, don’t be bulldozers; wait for the opening.
Keep Your Cool: We’re racing tiny cars, not for a million-dollar trophy. Keep the shouting off the driver’s stand so everyone can focus on their lines. Failure to maintain a positive respectful attitude can result in disciplinary action, up to and including disqualification from the event.
Questions?
If you have any questions, please speak with Jake, our race director. If you have difficulties with your car(s) or need a helping hand, there are other racers who will be happy to help. Jake can help to direct you to someone who will be happy to lend a hand.
Thank you!
We are glad you’re here! Thank you for participating in the event. We hope you have a great time and come back to race with us again.
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