The “SPIRIT” of this H2R Mustang 4 Challenge Series is as follows:
A real sprint and/or endurance-racing event open to Harris Hill Members only and interested parties in purchasing a race series pass. The Challenge is a racing event as inexpensive as possible while maintaining all recognized safety regulations previously established by the larger sanctioning bodies. It’s a friendly competition between drivers in “like” machines, a true “spec” series.

The “SPIRIT” of this class is as follows: 

Showroom Stock “OEM” 1979-1993 2.3L Mustangs.
1979-1986 2.3L Capris.
1983-1988 2.3L T-Birds *
1978-1981 2.3L Fairmonts.
1979-1981 2.3L Zephyrs.

* Turbos must be removed, and rear discs must be converted to drums
What we would like to see are 100% OEM 1979-1993 2.3L Mustangs with more than 100,000 miles on the drive train, outfitted with safety equipment specified in the H2R Challenge General Rules.
If any questions arise from the interpretation of these rules, or during an event, the SPIRIT of the rule will be the guideline for the final decision by the race committee.

Driver’s whose cars do not meet the OEM or performance rules MAY or MAY NOT race but will not be scored or earn points for the event or series. See “Spirit” section above.
Harris Hill is a club. It is not the SCCA. After an SCCA event, the drivers all go home to different parts of Texas and surrounding states, sometimes never interacting with each other again. Here at Harris Hill, we all know each other and see each other sometimes on a weekly basis. The safety rules, performance rules and driving rules herein are designed to promote entertaining, real competition without the overhead of who spent more or overly aggressive driving and contact racing. This is why the “spirit” of the rules is listed and will be referred to when casting judgment. Knowing this available disparity, the smart builder or driver should err well within the boundaries of the rules rather than pushing the edges.

Expense Mantra:

Racing costs money.
Spec Matias cost a lot.
Porsche 914s cost even more and break down, a lot.
4-cylinder Mustangs cost a lot less.
Used parts are extremely affordable and easy to find.
Racing costs money.

When asked to make changes to your car or safety gear to comply with these event rules, please refer to the racing expense mantra. If the costs of this event offend your sensibilities or exceed your budget, then racing this event is not for you and we are sincerely sorry.

The H2R Challenge is NOT crap-can racing, despite the flags and nomenclature that may be used. The cars need to be attractive and clean. Remember this is a spectator sport as well!

H2R Allowed performance changes to the car:

This is an OEM stock production based class. The horsepower cap is based on the highest-horsepower cars from the model range. There are essentially three different “categories” of Mustang 4-Cylinder cars:

1) 1979-1988 - Carbureted 2.3L cars yielding 88 hp.

2) 1988-1990 - EFI 2.3L cars yielding 88 hp.

3) 1991-1993 – Twin-plug 2.3L EFI cars yielding 105 hp.

All parts of the car must be OEM stock as equipped on the greater majority of 1979 – 1993 Mustangs. Some LX and GT parts are allowed:

OEM LX/GT front brakes / spindles

Maximum Motorsports Caster/Camber plates

Hawk/EBC pads

8.8 rear end w/ factory traction lock – any gear allowed

K&N drop -in filter

Schoenfeld Race header – offset muffler 2.5” exhaust

KYB GR2 dampeners

Ford Racing "C" spring

ANY "Factory" sway-bar combination front & rear

Maximum wheels size is the factory 16" x 7' Pony wheels; any and all 15" x 7" 
factory wheels are allowed; maximum tire section is a 225mm.

Spec Tire is Fuzion Touring 225/50R16 or 225/60R15 ONLY

ALL interior can be removed with the exception of the dash assembly and door panels. However, you can gut both.

2800 lbs. min weight.

105 HP maximum with approximately 93 RWHP. This means the 1991-1993 twin-plug cars do not have any allowed engine modifications beyond the above mentioned modifications. Earlier cars can make modifications not to exceed 93 RWHP / 105 HP.

NO changes, additions, removals or modifications are allowed unless specifically addressed in the rules.

NO aftermarket replacement parts are accepted unless specifically mentioned. If the rules do not specifically say you can do it, you are not allowed to do it. (i.e. polyurethane, delrin bushings for suspension or spherical rod ends for bump steer)

*If you cannot determine the difference between a safety and performance rule, consult a race steward BEFORE making the purchase, change or modification.

The following are absolutely forbidden (repeated here because we know you will ask):

No aluminum drive shafts, nor flywheels
No rear disc brakes (really? You’re not supposed to use them)
No 5 lug conversions
No tinted windows
No sun roofs/T-Tops, convertibles
No other suspension mods (3 link, panhard bar, watts link, SLA)
No polyurethane, delrin bushings
No bump steer kits
No solid or offset rack & pinion bushings 
No brake cooling ducts
No coolant. 
No sub frame connectors
No strut tower bracing
No rear shock tower bracing
No X2 ball joints
No aftermarket or factory boxed upper or lower control arms (front or rear)
Must use factory “collapsible” steering column
No aftermarket aero, front or rear

H2R Allowed performance changes to the car:

Minor repair and/or replacement parts for the engine and drive train may be aftermarket OEM replacement parts.

The parts must be the same specification as OEM 1978-1993 Fox platform, with no performance enhancement or appearance change. (Examples are water pump, timing belt, seals, gaskets, hoses, filters)

Major parts such as the crankshaft, block, head, and cams must be OEM 1978-1993 Ford factory replacements

If there is ANY question on this, consult a race steward FIRST

Brake rotors are Power Stop Brake Rotors.

Brake fluid, engine oil, transmission oil, rear diff oil is open.

Engine coolant is forbidden but WATER is recommended (water wetter or equivalent is ok). Spilled coolant is hard to clean off the track!

Power steering and A/C system removal is open.

Catalytic converter must be either removed and replaced with a “test pipe” or cored out. This is for fire safety. The “test pipe” may be welded in but may not exceed the length of the OEM catalytic converter by more than 6 inches total.

The clutch pressure plate must be OEM or OEM spec.

Fuel must be “pump” fuel from a regular gas station. (93 octane or less)

Tires – For 2015 the series will allow only the tire and size listed below.

Fuzion Touring 225/50R16 or 225/60R15

The H2R Challenge does allow some interior plastic, carpet, switch assembly wiring, heating, A/C, and non-metallic item removal. Stock dash and door panels must remain but can be gutted. Remember that we run starting in February and we DO run in the rain so you may want to keep your heater/defroster. The spirit of the rule is to maintain the stock appearance of the cars.

Metal removal from the interior for the purposes of safety is acceptable, (ex: Roll cage clearance for rear shoulder belt mount) BUT must be done at a minimum. For example, you cannot cut off the seat belt towers when a notch or simple design change is possible. When in doubt consult a race steward BEFORE YOU CUT!!!

Shift knobs, pedals, gauges and other driver “comfort” items are open. 
Fender liners and mud flaps may be removed.

A “race” alignment adjustment is permitted and encouraged.

Stainless brake lines at the calipers and rear axle are open. 

Parking brake removal is open.

The minimum weight of the car and driver is 2600 lbs. post-race. Drivers will be responsible for making minimum weight to obtain points for that race. When possible, Harris Hill will have scales available pre-race for participants.

Overall horsepower of the car will be a tech item when possible. This test will be comparative rather than absolute. Tests will be done using accelerometer type software like “Pocket Dyno” for the iPhone. The weight of your car will be required for this test; see above rule. The maximum horsepower accepted is105 HP. This value will be filled in later as we learn more about the horsepower of old 100K 2.3L Mustang engines. See “Spirit” of the rules above.

Point System:
1) Position points: 
Position points will only be awarded for finishing positions in class. Racers who finish 1st will earn 10 points, 2nd - 7 points, 3rd - 5 points, 4th - 4 points, 5th - 3 points, 6th - 2 points and 7th - 1 point. To earn position points, racers must run at least one race lap. Points will be awarded in class for enduros in the same way as in sprint races. If two or more drivers share a car during an enduro, the total points earned by that car will be split equally among the drivers who drove it in that race. 
2) Bonus points: 
A racer will earn 1 bonus point for each car in class that finishes the race behind the car driven by that racer. Bonus points will be earned by all cars finishing the race except the car that finishes last in the class. Cars that do not finish the race (DNF) or are disqualified (DQed) do not count as cars beaten in the class. There will be a 10 point limit on bonus points available in any race. For example: The car that finishes 21st in a 22 car field where all 22 cars finish will earn 1 bonus point. In that same race the car that finishes first will earn 10 bonus points. 
3) Event points: 
Each racer will earn 5 points for each event attended where the racer starts at least one scheduled race. To qualify as a starter, the racer must have passed the starter stand on the track after the green flag has been displayed to start the race. A late start after the field has started will count as a start if the racer passes the starter stand on the track. There will be a maximum of 25 points available for each year in this category. 
4) Championship points: 
The best 10 race point totals for each racer in all points scoring races for the year will count toward the H2R Championship. Each monthly event will have 2 races thus 16 races for the year. Ties for the first three positions will be broken by the highest total in the 9th race, then 11th race, then the 13th race, etc.