HPI Racing - 2001 HPI Challenge USA

2001 HPI Challenge USA Rules
last updated July 30, 2001

WELCOME TO THE 2001 HPI CHALLENGE RACE SERIES!
Thank you for your participation in the HPI Challenge! This series is quickly growing in popularity around the world because of its exposure to spectators, fun for racers and excellent prizes for each participant.

The primary ambition of the HPI Challenge series of races is to promote the radio control hobby to people who have previously had no little experience watching or driving R/C cars. We also want each participant, whether they are a racer, pit person, family member of a racer, organizer or spectator, to have as much fun as possible.

Please read over the rules below; you will be expected to understand them when the HPI Challenge comes to a location near you. These rules are not meant to intimidate racers into not participating. The rules are in place to keep the racing as even and as fair as possible. If there are any questions see the HPI personnel at the track before racing.

ADDITIONAL RACE CLASSES FOR 2001
Participants in the 2000 HPI Challenge USA series will notice that a few rule changes have taken effect for 2001. The majority of these rules concern adding new "exhibition" classes for Electric Rally, Super Nitro Rally and HPI truck racers, as well as homologating the HPI Challenge USA series rules with rules used throughout the HPI Challenge races in Europe.

SPORTSMANSHIP
Because we are trying to attract new spectators and hobbyists, good sportsmanship is a required attribute of all HPI Challenge participants.

Proper manners and good sportsmanship are expected of all drivers at all times while participating in any HPI Challenge event. Because we are promoting the hobby to people who are not familiar with the R/C hobby, it is important to understand that general bad behavior (cursing, intentional bad driving, etc.) will not be accepted and can result in a competitor being penalized, disqualified or even asked to leave in extreme cases.

Good sportsmanship includes:

Helping out a racer who appears to have trouble (lending a set of radio crystals, tool, etc.)
Telling drivers on the stand when it is safe to pass your car on the track
Thank racers for moving over if you are lapping them
Don't try to race against the leader of a race if you are going a lap down
Pitting for a Nitro racer who does not have a pit person
Volunteer turn marshaling
Helping set up or tear down the track (the race organizers are already very busy)
Fix the track between races
Pick up after yourself to keep the pit area clean, and help others keep their area neat
REMEMBER THE GOLDEN RULE: Treat other racers just like you would want to be treated!

Bad sportsmanship includes:

Turning on a radio at any time without a radio clip or during racing
Running a car in the parking lot area, outside of the racetrack area
Looking for ways to bend or break the rules to your advantage.
Bad driving (intentional hitting, over-aggressive driving, cutting the track, etc.)
Driving an out of control car (missing a wheel, unglued tire, missing a wing, etc.) and ignoring the race announcer's call to stop your car
Coaching or talking to a driver that is participating in a race (Cheering is, of course, allowed and encouraged!)
Yelling or cursing on the driver stand, in the pit area or at other drivers, HPI or race personnel, etc.

If there is a dispute between drivers it must be brought to the attention of the race director or HPI personnel. The officials at the track will do their best to resolve any issue to the satisfaction of the racers, the rules and the general rules of sportsmanship.

SPONSORED DRIVERS
Sponsored drivers are not allowed in the RS4 Electric Sport or RS4 Nitro Stock classes, no exceptions! "Sponsored drivers" are defined as any person who receives (or has received in the 6 months prior to the race) discounted or free material from any hobby- or R/C-related company or retailer. HPI employees, Factory Team Drivers or Sponsored Drivers are not allowed to compete in any class of the HPI Challenge USA series.

SCHEDULE FOR THE WEEKEND

Saturday

until 11:55 AM Open practice

noon Driver's Meeting

HPI Concours Challenge

1 PM First round of qualifying

Second round of qualifying

5 PM Anticipated end of qualifying

Sunday

until 8:55 AM Practice

9 AM Driver's Meeting (if necessary)

Racer group picture

Third round of qualifying

noon Anticipated end of qualifying

1 PM Anticipated start of main events

4 PM - 5 PM Anticipated end of main events

Prize presentations

OPEN PRACTICE
Practice on the track will be allowed until noon on Saturday. If the track is available and the race organizer allows it, participants may practice on the track before Saturday. Contact the track, shop, club or the person organizing the event at the race location to confirm you will be allowed to practice Friday.

If there are problems with too many cars on the track during open practice, the race announcer may announce a timed practice that will allow separate practice times for electric cars and Nitro cars. The practice times will be based on the ratio of electric cars to Nitro cars. For example, 80 Nitro racers and 40 electric racers will get 40 minutes for the Nitro cars and trucks, and 20 minutes for electric cars.

During open practice, racers will be encouraged to have their cars inspected before racing begins. This will help make sure all drivers are within the rules set forth by their racing class.

DRIVER'S MEETING
At noon on Saturday, all participants in the HPI Challenge will be expected to attend the drivers' meeting. A quick summary of the rules will be covered, and specific rule questions may be asked. Drivers and their pit crew will be expected to understand each rule by the time they leave the driver's meeting.

CONCOURS CHALLENGE
The HPI Concours Challenge/Car lineup will take place approximately five minutes after the driver's meeting is completed. All competitors will be encouraged to place their cars on the longest straight portion of the track for picture opportunities, while judges decide the top ten best cars for the HPI Concours Challenge. Cars will be judged on a Best Overall rating, including color, masking, detail, and accessories like wheel choice, interior sets and other detail. HPI car chassis and bodies are required. HPI wheels and tires are not required, but are encouraged. Racers are encouraged to paint their own bodies, not paying someone to do the job. Judges will be chosen by HPI personnel and may include HPI personnel, race officials, spectators, etc.

From the main group of cars, the best 10 to 12 cars will be picked by the judges. This group will be narrowed to a total of three. Judges will then decide the overall best car. The top three cars will earn prizes from HPI, with a kit and large trophy awarded to the overall winning car's owner.

The winning car body must be raced in at least one heat or main event. Accessories like interior body sets may be removed before running. A winning car body may win only once in any HPI Concours Challenge.

RACE FORMAT
All racers will have the opportunity to practice before and after each day's racing. In all classes except for the Rally classes, every racer will get three qualifying races to get as many laps as possible around the track in five minutes. After three rounds of qualifying races all racers in each class will be sorted in order, with the fastest driver earning the top qualifier spot. Drivers with the most laps in five minutes will be ranked first, with the lowest race times breaking any ties. Racers in both Rally classes will run a series of "heads up" races that count towards a points total. The driver with the most points at the end of the weekend will be announced as the winner. There will be no throw-outs.

Two qualifying rounds will be run on Saturday, with one round run on Sunday. After the final qualifying round on Sunday, a lunch break/practice session of approximately one hour will take place. Main events will take place after the break and will run until completed. The prize presentation will be made approximately fifteen minutes after the completion of the last final race.

PRIZES
Every participant who pays their entry fee and races in at least one race will receive one HPI body and one HPI hat, regardless of how many classes they enter. Hats will be passed out during racing on Saturday. Bodies will be passed out either during racing or after the prize presentation on Sunday. Racers in the Nitro Stock class will receive one additional HPI body, for a total of two. Racers will be able to choose which body they receive from a list of available bodies. HPI personnel choose bodies to bring at least two weeks before each event and cannot exchange bodies for any racers. Bodies are available on a limited, first-come, first-serve basis - once one style of body is gone we cannot make exchanges.

Race Prizes
Electric Sport, Electric Pro, Nitro Stock, Nitro Modified, Super Nitro Modified: The winner of the A Main in each of these classes will receive a custom 2001 HPI Challenge trophy and a free HPI kit. The rest of the A Main (2nd through 10th position) racers in these classes will receive custom 2001 HPI Challenge plaques. Racers who finish their main event (B Main, C Main, etc.) in first, second or third place will also receive a custom 2001 HPI Challenge plaque to commemorate their achievement. The overall winner of each of these classes will also be entered into the drawing for a free plane ticket to Europe for our 2001 HPI Challenge World Finals. See below for details.

Electric Rally, Super Nitro Rally, Nitro Truck: The top ten racers in each of these Exhibition classes will receive a custom 2001 HPI Challenge plaque to commemorate their achievement. If ten or more racers enter in each one of these classes, the overall winner will receive a free HPI kit.

Trophy winners will not receive a plaque in addition to the trophy. Racers who win more than one class will receive one trophy and kit for each win. Kits are predetermined for each class; winners cannot choose which kit they will receive.

QUALIFICATION FOR A TRIP TO THE 2001 HPI CHALLENGE WORLD FINALS
The winner of each class not designated as an "Exhibition" class (see above) will be entered into a drawing for a plane ticket to Europe, to represent the United States at the third annual HPI Challenge World Finals. The only way to enter this drawing is to win a qualifying class at any 2001 HPI Challenge USA race. Racers have the opportunity to win as many classes as they wish, and may also participate in as many HPI Challenge races as they wish. However, racers can only race in one class at the HPI Challenge World Finals; if a racer's name is drawn two or more times for a trip (from winning in two or more classes at any of the races), that racer must choose only one class in which to race. A different name will be drawn for the second and consecutive classes if the same person's name is drawn more than once.
At the end of the 2001 HPI Challenge USA series (September), a drawing will be held to see who will represent HPI USA and compete with the world's best HPI drivers!
The winner of each drawing will win:
One reserved "invitational" spot in their chosen class
One round trip plane ticket to Europe!
If the drawing winner from each class is unable to confirm their availability within 10 days after the drawing, another drawing will take place to choose another winner from the same class. Hotel, rental car and food costs are the responsibility of the winning racer.
Racers who won an event but not the drawing will have an entry spot reserved for them at the HPI Challenge World Finals event, however, their ticket will not be provided by HPI USA. Racers who attend the World Finals from the USA may be able to run in more than one class if they wish - confirmation will be determined by the World Final race organizer.

GENERAL RULES - APPLY TO ALL CLASSES
Confirmations of rules can be attained and confirmed by Frank McKinney - the HPI Challenge USA Coordinator. Any infringement of the HPI Challenge Rules can result in at least a warning and/or time penalty to a racer's best qualifying time. Serious breaches of the HPI Challenge Rules, general bad behavior or foul language during the weekend could result in a competitor being disqualified and asked to leave the meeting. Warnings can be issued by Frank McKinney or by the Race Director(s). ONLY Frank McKinney can confirm penalties. If you have a dispute, please see Frank McKinney immediately.

Because these rules apply to the HPI Challenge, we expect the following parts used in the races to be HPI-brand parts:
- car kit
- Tires
- Wheels
- Inserts
- Bodyshells
- Wings (must be a standard wing used on original bodyshell)
Any brand of the following miscellaneous parts may be used by competitors in the HPI Challenge USA series, because we understand that they do not make any performance difference in the performance of the cars:
- Spur gears (for Electric Sport, Rally and Pro classes only)
- Pinion gears (for Electric Sport, Rally and Pro classes only)
- Turnbuckles
- Screws
- Ball cups and rod ends
- Fuel tubing
- Fuel filters
- Antenna tubes
- Antenna mounts
- Body pins
- Shock spacers
- similar items that do not affect performance, to be determined on a case-by-case basis
Specific exceptions or additions to these rules will be noted in the specific class rules (see below).
The following part may not be used on any car competing in the HPI Challenge series:
- Electronic Gyroscopes

SUBSTITUTE DRIVERS
Substitute drivers are not allowed in any qualification or main event race. An immediate disqualification from the race will result.

NITRO CAR CLASS RULES
These rules apply specifically to the Nitro car classes because of their unique nature that sets them apart from Electric cars.

LOOSE EXHAUSTS
Any Nitro car that has a loose muffler, header or exhaust that is causing excessive noise will be asked to pull into the pit lane immediately for repair. This is a standard race rule that most racers recognize. Repairs must happen in the pit lane or off the racing area by a racer, or a loss of one lap in that race will occur. If the car does not have the exhaust system repaired within one lap of the race director's warning, a loss of one qualifying lap in that race can occur. If the car does not have the exhaust system repaired within two laps of the race director's warning, the racer will be black-flagged and disqualified from that round of racing.

PIT AREA
The pit area must be kept clear of anyone who is not a racer or pit person for the race that is on the track. Please help us accomplish this by asking spectators and other racers to stand away from the area.

PIT STOPS
Pit stops to refuel Nitro cars and trucks must be completed in the pit area of the track, which will be designated for all drivers during the driver's meeting. For safety reasons, refueling and repairs must be done with the car completely off the racing surface and behind the pit area's outer wall. A warning will be given to pit persons who do not comply with this rule. On a second or further offense a penalty of 10 seconds will be applied retroactively (after the race is completed) to any car that is not fueled properly.

All Nitro classes that run 10-minute final races will be required to have one pit stop. If a fuel stop is not required, the car must be picked up off the track surface for at least 3 seconds. A race organizer or HPI representative will be designated to watch the pit area during each A Main. A penalty of one lap will be applied retroactively (after the race is completed) to any car that does not make a pit stop.

RACE STARTS
Nitro class racers will have the starting procedures for the final race explained during the driver's meeting. Because different tracks and clubs use different methods (flag, pitmen, gridding, etc.) to start their races, we will comply with their standard starts.

TECHNICAL INSPECTIONS
After each qualifying and main race:
- drivers will turn in their cars and radios to the technical inspection tables
- remove their transponders and
- proceed directly to the race track and their marked positions for turn marshalling.

Every car must be inspected after each race or the car will be disqualified from that race. Drivers that do not finish or start their designated race must still turn their cars in for inspection. Inspection of each car will start only after the start of the following race. All cars will be available for pick-up and return to the pit area only after the following race is complete. If detailed inspections are required, the drivers involved will receive their cars as quickly as possible.

"STRUCTURAL MODIFICATIONS"
All HPI Challenge classes have rules that prohibit structural modifications. This includes, but is not limited to:
- Altering the position of the fuel tank, except for what is provided on HPI option parts
- Using a lowered fuel tank
- Using a larger fuel tank
- Modifying the upper deck or creating a custom upper deck to alter belt and/or fuel tank position
- Changing the wheelbase of any kit other than Pro 3, Nitro MT, Super Nitro or Super Nitro Rally beyond the options provided by the kit
- Changing the position of the servos in any kit (i.e., mounting the steering servo on the Nitro RS4 RTR on the main chassis)
- Using custom parts that alter the suspension geometry beyond that provided by HPI option parts

BODIES
Bodies used for the HPI Challenge are expected to comply with a few general rules; apart from these rules, the bodies may be run as you wish.

- HPI bodies only
- The rear bumper or tail area of the body may not be cut out above the bottom molded cut line
- The front windshield opening for Nitro cars may not be larger than a 2 inch (50mm) diameter circle (2 inches or 50mm wide in any direction)
- The front windshield opening for Nitro trucks may not be larger than 1/2 the windshield area
- Reasonably sized holes are allowed for glow plug, carburetor screw and fuel tank cap access; holes larger than 15mm-20mm are to be discouraged
- The front, rear and sides may not be cut out above the bottom molded cut line
- Transponders may be required to be mounted in the clear windshield area of each car body for quicker removal; this is an optional rule and will be announced during the driver's meeting

TURN MARSHALLING
Turn marshaling is a basic duty of all racers and is generally considered a chore that must be dealt with. However, it is required and expected of all racers The basic rules of turn marshaling below apply to all R/C racing events and are expected to be followed.

Things expected of turn marshals

Turn marshals are expected to marshal cars the way they would want to be marshalled in a race. (The Golden Rule)

Immediately after finishing a race, each racer must leave their car and radio at the technical inspection table and go to their section of the race track to prepare for the next race. Delays make the race day longer for everyone.

Arguments or rules questions will be settled only after a racer has completed their turn marshalling duties.

"Hustle", or going as quickly as possible to a flipped car's position, is the best way to demonstrate good turn marshalling.

Wait for any nearby car still racing to pass before crossing a section of track to retrieve a stuck car.

Ignore yells from the driver stand.

Always pay attention to your section of the track.

Do NOT attempt to repair cars that are damaged (except for a stuck body) - just shut them off and set the car on its side, off the race track surface.

Keep spectators and children off the racing surface at all times.

If a racer is unable to turn marshal, another racer may be a substitute.

Racers in the last heat or main event in any round will turn marshal the first race of the round. If enough racers agree, we can have the Nitro racers marshal the Nitro classes, and the Electric racers marshal the Electric classes.

Prohibited turn marshal activities:

Delaying the start of the next race by going to their pit area, talking with friends, etc.
Refusing to turn marshal
Leaving the track before the race announcer calls out the end of the race and all racers finish their last lap.
Watching a close race battle and not their section of the track.
Attempting to repair any car (except for turning off broken/runaway cars or repairing body damage).
Sitting down, eating, drinking, smoking, talking on a mobile phone, talking, etc.

RADIO IMPOUND
Circumstances may require that radio transmitters be held by race officials until the drivers in each heat or final require them to race. The process of impounding radios will be explained to all racers during the driver's meeting.

PENALTIES
Actual penalties beyond verbal warnings are extremely rare at most racing events. The HPI Challenge rules exist to serve as a basis for fair, fun and competitive racing, not as a way to arbitrarily penalize racers. With this in mind, these rules must be in place should any questions of legality or sportsmanship come up. In these situations, HPI and race personnel will use the following system of warnings and penalties for all rules and sportsmanship situations:

Drivers will be warned on their first offense.
On a second offense, the driver will receive a time penalty of 10 seconds on their race time for that round of racing.
A third offense will disqualify that driver from that round of racing.
Any further offense will result in disqualification from the event, and the driver will be asked to leave the event grounds.
Penalties that are already part of a specific set of rules (such as pit stops, loose tuned pipes, etc.) will be used in lieu of the above penaly procedures.
The only exception to these rules is that during post-race technical inspections for the main events, a driver who breaks a technical rule (pertaining to motor, engine, body, tire, chassis, etc.) or fails to complete their turn marshaling duties will be retroactively disqualified from their main event and automatically finish last in their main event.

BRING THESE RULES WITH YOU TO THE RACE
This will help us avoid any confusion and help to keep everyone using the same rules throughout the event.

Thanks for attending the 2001 HPI Challenge race series, good luck and always have fun racing!

QUALIFYING and FINALS
- 3 Rounds of Qualifying
- 5 Minute Races

CAR
- Standard RS4 Sport, RS4 Sport 2, RS4 Pro 2, RS4 Pro 3 and RS4 Rally cars only
- Max Width = 200mm
- Ball bearings are allowed as direct replacement for standard bushings on the RS4 Sport only
- Saddle pack battery conversion is allowed (plastic battery cradle (#A372) and hook-and-loop straps (#6152) for RS4 Sport 2, or RS4 Pro chassis (#A560) for RS4 Sport or RS4 Rally)
- No other modifications or structural changes - silver kit springs must be used, no heat sink plates, etc.

BODYSHELLS
- Any 190mm or 200mm HPI bodyshells (including the HPI Rally bodyshells)
- HPI foam bumpers may be used
- All bodyshells and wings must be cut out and mounted according to HPI body instructions
- No rollover (fiberglass or graphite) antennas

TIRES
- 1/10 scale touring car HPI tires must be used
- 1/10 scale touring car HPI foam inserts must be used
- 1/10 scale touring car HPI wheels must be used

MOTORS
- Any ROAR-legal 24 degree 27-single REBUILDABLE motor must be used.

GEAR RATIOS
- Any gear ratio may be used.

BATTERIES
- Any batteries that are ROAR legal are allowed.

RS4 Electric Rally
Exhibition Class
REQUIRED ENTRIES
- To run RS4 Electric Rally as a separate class, at least 5 separate racers must be signed up
- If not enough racers sign up, any racers who have signed up will be invited to race in the RS4 Electric Pro class, and racers will follow the rules set aside for, and compete in, the RS4 Electric Pro class

POINTS SERIES RACING
- Minimum of 4 Rounds of Racing (more may be possible)
- 5 Minute Races
- Drivers will earn points during each round of racing, ordered by most laps/lowest time:

1st place 25 points 6th place 11 points

2nd place 20 points 7th place 9 points

3rd place 17 points 8th place 7 points

4th place 15 points 9th place 5 points

5th place 13 points 10th place 3 points

- After the final RS4 Rally race, each driver will have his/her points totaled and sorted
- In the event of a tie, the tiebreaker will be the number of first-place finishes each driver has, then the number of second-place finishes, etc.
- The driver with the most points at the end of the weekend will be declared the winner
- The following nine drivers will receive custom 2001 HPI Challenge plaques

RACING SURFACE
- Attempts will be made to have a dirt surface and track layout available for the RS4 Electric Rally class. If this is not possible, reasonable attempts will be made to supply appropriately sized jumps for this class (no more than 3 inches high, for scale realism).

CAR
- Standard RS4 Rally cars or converted RS4 Sport, RS4 Sport 2, RS4 Pro, RS4 Pro 2, RS4 Pro 3 cars only
- Max Width = 200mm
- Ball bearings are allowed as direct replacement for standard bushings on the RS4 Sport only
- Saddle pack battery conversion is allowed (plastic battery cradle (# A372) and hook-and-loop straps (# 6152) for RS4 Sport 2, or RS4 Pro chassis (#A560) for RS4 Sport or RS4 Rally)
- No minimum weight limit
- Any hop-up options will be allowed, except where otherwise stated
- No structural changes the car must maintain stock measurements in all respects

BODYSHELLS
- Any 190mm or 200mm HPI bodyshells (including the HPI Rally bodyshells)
- HPI foam bumpers may be used
- All bodyshells and wings must be cut out and mounted according to HPI body instructions
- No rollover (fiberglass or graphite) antennas

TIRES
- 1/10 scale touring car HPI tires must be used
- 1/10 scale touring car HPI foam inserts must be used
- 1/10 scale touring car HPI wheels must be used

MOTORS
- Any ROAR-legal ball bearing or bushing modified motor may be used

GEAR RATIOS
- Any gear ratio may be used
- 2 speed transmissions are not allowed

BATTERIES
- Any batteries that are ROAR legal are allowed

QUALIFYING and FINALS
- 3 Rounds of Qualifying
- 5 Minute Races

CAR
- Any RS4 Pro, RS4 Pro 2, RS4 Pro 3 or 190mm RS4 Sport, RS4 Sport 2.
- Max width = 190mm
- No minimum weight limit
- Any hop-up options will be allowed, except where otherwise stated
- No structural changes - the car must maintain stock measurements in all respects

BODYSHELLS
- Any 190mm wide HPI bodyshells (Note: 200mm cars are not allowed)
- HPI foam bumpers may be used
- All bodyshells and wings must be cut out and mounted according to HPI body instructions
- No rollover (fiberglass or graphite) antennas

TIRES
- 1/10 scale touring car HPI tires must be used
- 1/10 scale touring car HPI foam inserts must be used
- 1/10 scale touring car HPI wheels must be used

MOTORS
- Any ROAR-legal ball bearing or bushing modified motor may be used

GEAR RATIO
- Any gear ratio may be used
- 2 speed transmissions are not allowed

BATTERIES
- Any batteries that are ROAR legal are allowed

QUALIFYING and FINALS
- 3 Rounds of Qualifying
- 5 Minute Races, 10-minute race for A Main (if conditions allow)

CAR
- Any standard Nitro RS4, RS4 Nitro 2 and RS4 Ready To Run cars will be allowed in this class
- Max Width = 200mm
- HPI Black Progressive Springs only (kit springs, #6836)
- Any shock oil may be used
- Any HPI shock pistons may be used
- Ball bearings are allowed as direct replacements for standard bushings on the Nitro RS4
- NO other modifications allowed except where otherwise stated

BODYSHELLS
- Any 200mm wide HPI bodyshells
- HPI foam bumpers may be used
- All bodyshells and wings must be cut out and mounted according to HPI body instructions
- No rollover (fiberglass or graphite) antennas

AIR HOLES
- Maximum 50mm (2 inch) hole is allowed in the front window
- Side and rear windows may be cut out as required

TIRES
- 1/10 scale touring car HPI tires must be used
- 1/10 scale touring car HPI foam inserts must be used
- 1/10 scale touring car HPI wheels must be used

ENGINE
- RS4 Nitro Stock class cars must run the 15FE engine (#1615) with 4.6mm carburetor.
- RS4 Nitro Stock class cars must run the plastic side muffler set (#A878) or the rear "can" muffler (#A870); NO aftermarket optional exhaust parts allowed except for silicone extension tubes, etc.
- All components within the carburetor, engine and exhaust must remain intact and standard, except where otherwise stated. For example: no engine/carb/crankshaft boring, grinding, removing parts, etc.
- The engine pullstart must work at all times!
- HPI retains the right to inspect any engine at any time. The engine may be inspected by HPI and returned within 14 days with a ruling.
- The rear metal "can" muffler may have the internal metal baffle removed if desired
- A standard non-turbo car glow plug must be used at all times
- The stock cast flywheel may be replaced with the #A801 flywheel/#A804 collet set if desired. This is the machined standard flywheel, NOT the lightweight flywheel with holes cut into it.
- Stock clutch shoes must be used, optional clutch shoes not allowed
- Throttle return springs allowed and encouraged

GEAR RATIOS
- 13 tooth clutchbell only, with standard 44 tooth spur gear.
- No 2 speeds allowed. If a two speed is installed, it must be "locked out" (set so that second gear does not engage). Race officials will be able to tell if a car is using a 2 speed!
- Stock differential lubricant must be used. No "pinning" or "locking" of the differentials is allowed. Gear diffs must run "free", just as they are built stock.

QUALIFYING and FINALS
- 3 Rounds of Qualifying
- 5 Minute Races, 10-minute race for A Main (if conditions allow)

CAR
- Any RS4 Nitro Racer, RS4 Racer 2, RS4 Nitro Sport, RS4 Nitro 2 or HPI Ready to Run cars will be allowed
- Max Width = 200mm
- Any hop-up options will be allowed, except where otherwise stated
- No structural changes - for example, larger/moved/lowered fuel tanks, changing belt location or wheelbase, etc.; the car must maintain stock measurements in all respects
- Fuel tanks must be a stand-up design and hold no more than 75cc of fuel

BODYSHELLS
- A Super-size HPI bodyshell must be used, either 280mm or 300mm wheelbase
- HPI foam bumpers may be used
- All bodyshells and wings must be cut out and mounted according to HPI body instructions
- No rollover (fiberglass or graphite) antennas

AIR HOLES
- Maximum 50mm (2 inch) hole is allowed in the front window
- Side and rear windows may be cut out as required

TIRES
- Super-size HPI tires must be used
- Super-size HPI foam inserts must be used
- Super-size HPI Wheels must be used

ENGINE
- Any small block .12 or . 15 size engines with hop-up options
- Any type exhaust (CVEC, Paris Ring, etc.)
- All components within the engine and exhaust must remain intact and standard. For example: no engine /carb /crankshaft boring, grinding, removing parts, etc.
- HPI retains the right to inspect any engine at any time. The engine may be inspected by HPI and returned within 14 days with a ruling.

GEAR RATIOS
- 2 Speed with any gear ratio is allowed

RS4 Super Nitro Rally
Exhibition Class
REQUIRED ENTRIES
- To run RS4 Super Nitro Rally as a separate class, at least 5 separate racers must be signed up
- If not enough racers sign up, any racers who have signed up will be invited to race in the RS4 Super Nitro Modified class, and racers will follow the rules set aside for, and compete in, the RS4 Super Nitro Modified class

POINTS SERIES RACING
- Minimum of 4 Rounds of Racing (more may be possible)
- 5 Minute Races
- Drivers will earn points during each round of racing, ordered by most laps/lowest time:

1st place 25 points 6th place 11 points

2nd place 20 points 7th place 9 points

3rd place 17 points 8th place 7 points

4th place 15 points 9th place 5 points

5th place 13 points 10th place 3 points

- After the final RS4 Super Nitro Rally race, each driver will have his/her points totaled and sorted
- In the event of a tie, the tiebreaker will be the number of first-place finishes each driver has, then the number of second-place finishes, etc.
- The driver with the most points at the end of the weekend will be declared the winner
- The following nine drivers will receive custom 2001 HPI Challenge plaques

RACING SURFACE
- Attempts will be made to have a dirt surface and track layout available for the RS4 Super Nitro Rally class. If this is not possible, reasonable attempts will be made to supply appropriately sized jumps for this class (no more than 3 inches high, for scale realism).

CAR
- Any Super Nitro Rally car will be allowed
- Any hop-up options will be allowed, except where otherwise stated
- No structural changes for example, larger/moved/lowered fuel tanks, changing engine location, etc.; the car must maintain stock measurements in all respects
- Fuel tanks must be a stand-up design and hold no more than 75cc of fuel

BODYSHELLS
- A Super-size HPI bodyshell must be used, either 280mm or 300mm wheelbase
- HPI foam bumpers may be used
- All bodyshells and wings must be cut out and mounted according to HPI body instructions
- No rollover (fiberglass or graphite) antennas

AIR HOLES
- Maximum 50mm ( 2 inch) hole is allowed in the front window
- Side and rear windows may be cut out as required.

TIRES
- Super-size HPI tires must be used
- Super-size HPI foam inserts must be used
- Super-size HPI Wheels must be used

ENGINE
- Any small block .12 or . 15 size engines with hop- up options
- Any type exhaust (CVEC, Paris Ring, etc.)
- All components within the engine and exhaust must remain intact and standard. For example: no engine /carb /crankshaft boring, grinding, removing parts, etc.
- HPI retains the right to inspect any engine at any time. The engine may be inspected by HPI and returned within 14 days with a ruling.

GEAR RATIOS
- Single speed only with any gear ratio is allowed
- If a two speed is installed, it must be "locked out" (set so that second gear does not engage)

HPI Truck
Exhibition Class
REQUIRED ENTRIES
- To run HPI Truck as a separate class, at least 5 separate racers must be signed up
- If less than five total HPI Truck racers sign up, these racers will be invited to race in the RS4 Nitro Modified class
- If not enough racers sign up to run two separate HPI Truck classes, the 2WD and 4WD trucks will be combined in one race and run as a single class for one set of prizes.

- If enough racers participate, we will be able to separate the class into 4WD (Nitro RS4 MT) and 2WD (Nitro Rush) classes. The rules below will apply to both 4WD and 2WD class.

RACING SURFACE
- Attempts will be made to have a dirt surface and track layout available for the HPI Truck class. If this is not possible, reasonable attempts will be made to supply appropriately sized jumps for this class (no more than 4-6 inches high).

QUALIFYING and FINALS
- 3 Rounds of Qualifying
- 5 Minute Races, 10-minute race for A Main (if conditions allow)

TRUCK
- Any Nitro RS4 MT, Nitro RS4 MT Racer, Nitro RS4 MT RTR or Nitro Rush truck will be allowed
- Any hop-up options will be allowed, except where otherwise stated
- No structural changes for example, larger/moved/lowered fuel tanks, changing engine location or wheelbase, etc.; the car must maintain stock measurements in all respects
- Fuel tanks must be a stand-up design and hold no more than 75cc of fuel

BODYSHELLS
- Any HPI bodyshell made for HPI trucks
- All bodyshells and wings must be cut out and mounted according to HPI body instructions

AIR HOLES
- Maximum of 1/2 of windshield may be cut out for cooling
- Side and rear windows may be cut out as required

TIRES
- HPI truck tires must be used (Pro-Line Dirt Hawg or Bow-Tie tires are also allowed)
- Stock HPI or Pro-Line foam inserts must be used
- HPI wheels must be used

ENGINE
- Any small block .12 or . 15 size engines with hop-up options
- Any type exhaust (CVEC, Paris Ring, etc.)
- All components within the engine and exhaust must remain intact and standard. For example: no engine/carb /crankshaft boring, grinding, removing parts, etc.
- HPI retains the right to inspect any engine at any time. The engine may be inspected by HPI and returned within 14 days with a ruling.

GEAR RATIOS
- Single speed only with any gear ratio is allowed
- If two speed is installed, it must be "locked out" (set so that second gear does not engage)