Car classifications in Hillclimbing are really an eclectic mix of classes from SCCA Club Racing and Solo, with a few extra classes thrown in to catch all the rest. Essentially, if it has four wheels, you can drive it, and it meets the safety requirements, we’ll find a spot for you. Within each category listed below, there are individual classes that divide cars by power, weight, and other factors. With the many classes offered, we can find a spot for you to run, although you may not always be competitive. The only way to really know exactly what to do (or what not to…) is to download the 2018 Time Trial Supplemental Rules , the General Competition Rulebook (GCR) , or the Solo Rules.  Also, technical Inspectors are a good resource, and can point you in the right direction when you get lost. Essentially though, all cars fall into one of the following categories:

SCCA General Competition Rules (GCR) Classes


In response to the ever increasing performance of today’s street cars and to expand participation by various manufacturers, SCCA has developed a category for those cars which because of their performance potential, required some changes to their wheel/tires and suspension components. Touring 1 (T1) features the Porsche 996, Aston Martin Vantage and Touring 2 (T2) includes the Chevrolet Camaro SS, Mitsubishi Lancer Evo and others. Front runners in Touring 3 (T3) include the BMW Z4, Ford Focus ST and the Honda S2000; while Touring 4 (T4) is comprised with the likes of the Scion FRS and Acura RSX-S.

Improved Touring, Spec MX5, Spec Miata

Essentially, this is where we get into cars that most people consider to be “real” race cars. This class allows similar mods to Street Prepared (mostly bolt-on type stuff), but allows most stripping of interiors (other than dashes), but some restrictions are placed on wheel sizes and such. Some classes are specific in car types and mods: Currently allowed Improved Touring classes are ITA, ITB, ITC, ITR, and ITS. Spec Miata and Spec MX5 is (obviously) for Mazda Miatas.

Super Touring

Super Touring® features late-model production-based vehicles with a series of modifications to their drivelines and bodywork. The intent of the rules allows World Challenge cars to compete in Club Racing with minimal modifications as well as new cars to be built to the same spec as well. Forced induction may be added to some models and engine swaps are permitted. No model years older than 1985 will be permitted. The STU (World Challenge® Touring Car based) are mid-level performance cars of 3.2 liters and under.  STL is a small bore tuner class for cars of 2.0 liters and under. The competitiveness of any given car is not guaranteed.

Grand Touring

GT cars are purpose-built, highly modified “silhouette” replicas of series-produced sports sedans. GT cars are permitted tube-frame chassis with performance being equalized by allowing cars with smaller engines to compete at a lighter weight. GT-1 cars are the fastest of the category, and are the closest to the SCCA Pro Racing® Trans-Am® Series. Several of the current front running cars in GT-1 are last year’s Trans-Am cars, and many of these GT-1 drivers compete in select Trans-Am events throughout the season. GT-2, GT-3 and GT Lite cars get progressively lighter and less powerful. Cars include Toyota Celicas, Mazda RX-7s, Nissan 200SX, Honda Civics and Austin Mini Coopers, just to name a few.

B – Spec

A newly created segment of race cars called B-Spec targets the sub-compact market. Manufacturers have a keen interest in expanding the popularity of this segment by introducing more clients to driving smaller cars that are fun to drive, fuel efficient, and handle well.  The aim of the class is to provide (relatively) cheap access to racing, with the intention of maintaining a single “spec” for the cars so that they can compete in any series with minimal changes.


Series produced cars, which are allowed a range of performance modifications while retaining their original design, structure and drive layout. There is no age limit, such as Showroom Stock, so Production includes many cars as old as 50 years and as new as current body styles. The three performance potential based classes include: E Production (EP), F Production (FP) and H Production (HP).

EP is the fastest of the Production classes with HP running the slowest in the category. Several cars in the Production classes can be run in more than one class, just by changing the engine between races. The ease of engine changes allows many Production drivers to enter more than one class at the Runoffs each year. Cars included in Production classes come from a diverse group ranging from the MG Midget, Turner, Fiat X1/9, Alfa Romeo Spyder, Austin Healey Sprite, and Lotus Super 7 to the BMW 325, Mazda Miata, RX-7, Nissan 240, Honda Civic, Suzuki Swift GTI and Toyota MR-2.

Super Production (SPU, SPO)

Cars running Super Production according to the GCR Specifications shall be separated according to the following
SPU–normally aspirated cars of displacement 2999 cc or under, and forced-induction cars 1999cc and under
SPO–normally aspirated cars displacing 3000cc or over, and forced-induction cars 2000cc and over
All rotary engined cars will apply a 1.5 displacement multiplier when determining class.


Formula (FA, FB, FC, FF, FE, F500, FM, FV, FVCC, FS, FST, CF)

The ten formula classes are all single-seat, open wheel racecars. They are built to detailed specifications for weight, size and engine displacement. There are incredible power to weight ratios in each class. The classes in order of fastest to slowest are: Formula Atlantic® (FA), Formula 1000 (FB), Formula Enterprises® (FE), Formula Continental® (FC), Formula Mazda (FM), Formula Ford (FF), Formula 500 (F500), and Formula Vee (FV), Formula Vee Challenge Cup. Club Ford (CF), Formula S (FS) and Formula First (FST) are regional Classes only, but included to allow these type of cars to compete.

Many of the winged FA and FC cars, along with several of the non-winged FF cars are produced by some of the same companies that make Indy cars such as Lola, Van Diemen and Reynard. FA cars have motors that generate as much as 240hp. Motorcycle engines are the basis for the F1000 class where displacement is limited to 1000cc. The FC runs a stock 2-liter engine with about 150hp while the FF 1600 motors make around 120hp. FM utilizes a sealed Mazda rotary engine. FV includes many home-built cars, as well as cars built by proven manufacturers, and is one of the most competitive and popular classes in SCCA. FV entries all run 1200cc stock VW engines. F500s run small displacement, two-stroke engines like snowmobiles, and are one of the least expensive classes to run in SCCA.

Sports Racer (P1, P2)

There are three classes of purpose-built road racing cars with full fiberglass bodies. Underneath, these cars are pure racing machines. The power plants in these cars vary from home-built “pieces and parts” engines to sealed identical motors.

The Prototype 1 (P1) and Prototype 2 (P2) classes feature a variety of chassis including home-built, innovative designs and manufacturer produced cars. These classes evolved from the old modified category in the 1960s. The Spec Racer® Ford (SRF) is a one-design, single seat car utilizing a sealed Ford engine. It is SCCA’s largest class and continues to provide cost effective racing for over 800 competitors. By limiting the modifications and preparation costs, this class emphasizes driver ability over spending.

American Sedan (AS)

American Sedan® (AS), comprised of Chevrolet Camaros, Pontiac Firebirds and Ford Mustangs, are production-based chassis with modified suspensions and brakes. Engines are carbureted 302 and 305 CID V-8s that have been balanced and blueprinted.


Solo Classes

Street Prepared (ASP, BSP, CSP, DSP, ESP, FSP, SSP)

If you have a wild beast that is still able to be street driven (does not need to be street legal currently), you’ll probably fit in here. These classes follow SCCA Solo rules. Street prepared allows for most bolt-on parts for suspension and drive train, but does not allow major modifications like porting/polishing or turbo/supercharging unless it’s a stock factory system.

Street Mod, Super Street Mod, & Street Mod Front Wheel Drive

Street Mod classes allows for radical things all the way up to engine swaps (within the same manufacturer). Keep in mind that these are “street” cars, so lights and interior are required (to varying degrees). Street Mod (SM) includes all sedans, coupes, and pickup trucks. Super Street Mod (SSM) accommodates 2 seater cars, SM sedans/coupes that do not meet weight restrictions, and other exclusions listed specifically in the SCCA Solo Rules. Street Mod Front Wheel Drive (SMF) was created to separate rear wheel and front wheel drive cars since the performance of these designs varies dramatically.

Supplemental Classes

Vintage and Historic

Have an old race car that is running just as it did in the old days? Vintage or Historic may be a place for you to run. Again, cars are divided up by year, car configuration (sedan or formula), and displacement. These cars will have to meet minimum safety requirements to make timed runs, but it’s a great place to relive some of the old glory days.

Cars shall be prepared to and in possession of the SCCA Vintage Rules. A vintage or historic car will not be able to
compete at full competition speed unless it conforms to the current safety/roll bar rules specific in the current GCR, TTR. If a car does not conform to these specifications, it may be allowed to take exhibition runs at the posted road speed limit with no time posted. No exhibition runs will be allowed at track events. In Historic 1, 2 and 4 carburetors and intake manifolds, valve rockers and brakes are free. Transmissions are free as long as they have the same number of forward gears. Rear tube shocks can replace lever shocks. Fender flares composed of steel, fiberglass or aluminum are allowed. No racing slicks are allowed in any of these classes.
Vintage 1 (V1)–1950-1962 Sports Cars and Sedans 2000cc and under

Vintage 2 (V2)–1950-1962 Sports Cars and Sedans Over 2000cc

Vintage 3 (V3)–1950-Pre 1967 Sports Racing and Formula Cars
Historic 1 (H1)–1963-Pre 1973 Sports Cars and Sedans 1301cc to 2000cc
Historic 2 (H2)–1963-Pre 1973 Sports Cars and Sedans Over 2000cc
Historic 3 (H3)–1967-Pre 1973 Sports Racing, FIA, Can-Am and 1967-Pre1973 Formula Car, All Formula 5000
Historic 4 (H4)–1963-Pre 1973 Sports Cars and Sedans 1300cc and under



There will be two classes: Forced induction with a 34mm restrictor plate (Rally FI) and Naturally Aspirated (Rally NA). All cars must meet the classing and safety requirements and possess a current rule book from one of the following series:

  • Rally America
  • NRS (NASA Rally Sport)
  • CARS (Canadian Association of Rally Sport)
  • SCCA

Solo V (Solo Modified Class F)

Car preparation must meet the Solo V specifications set forth in the SCCA Solo regulations.
Both car and driver must meet the safety requirements outlined in the TTR.


Street Mod Extreme (SMX)

The intent of this class is to allow production vehicles modified beyond the boundaries of the Street Modified and Improved Touring classes while still retaining street / production car characteristics.


All 2 and 4 seat production vehicles.

Front, rear and all wheel drive configurations are allowed.

Pick-up trucks are allowed.

Kit cars, purpose-built race cars and specialty constructed vehicles are not allowed.

Please refer to the PHA Time Trials Supplemental Rules for details


These are our catch-all classes. Three classes divide cars by displacement. Essentially there are two kinds of cars in Special: those that are built just to set hillclimb records, and those that people want to run but they just don’t fit into any class. You might see anything in Special, from a Ford Torino dirt-track car (complete with top-fuel style wing) to a mini-formula car with a 3-cylinder 2-stroke engine and a variable belt drive. These cars must meet the safety requirements outlined in the Time Trial Rules, have operating suspension on all wheels, open or closed wheel design, and the chassis must be equally distributed along the center line of the vehicle.

Classed by engine displacement (multiplication factor of 1.5 shall be used for forced induction)
S1–0 to 1650cc
S2–1651 to 3500cc
S3–3501cc to 500 cubic in


INEX Spec (IS) and INEX Mod ( IM)

IS (INEX Spec) – This class shall be open to all “600 Racing” produced cars that are recognized as INEX or “Legends” cars (including but not limited to Legends, Bandoleros, and Thunder Roadsters), and shall conform to all current INEX rules, including tire specifications.
IM(INEX Mod) – This class shall be open to any car originally manufactured by 600 Racing that has been modified within the limitations of the PHA supplemental Rules. These modifications are to be allowed in excess of any current INEX rules. Any car modified in any way other than, or in excess of, the limitations below shall not be eligible for this class. If a modification is not specifically mentioned in the INEX rules or in the PHA Supplemental Rules, it is prohibited.


Electric Classes

Modified Electric
Modified Electric1 (ME1) – Over 200KW
Modified Electric 2 (ME2) – up to and including 200KW (~268 bhp)
This class is for electric cars made for, or modified for, racing.
(1) The vehicle must be totally powered by battery power; no other fuel may be used.
(2) All batteries must be fully contained in enclosures that may be sealed by race tech officials.
(3) A forced battery ventilation system must be fitted and must be rated at least 10 cfm. Not required if thermally stable batteries, such as Lithium Ferrous Phosphate (LiFePO4) are fitted.
(4) Material Safety Data Sheets or Safety Data Sheets must be available upon request by safety and tech officials.
(5) Any electric cables in the system must be the proper size to safely carry the current from the batteries without overheating.
(6) Any conductor or non-insulated area that is exposed must be properly insulated and labeled as high voltage with proper warning signs.
(7) A fuse, not a circuit breaker, must be in series with the main power source and cannot exceed 200 % of the expected battery draw at full load of system.
(8) Vehicle must have a master disconnect switch that will completely disconnect the vehicle from the power source.
– This switch must be clearly marked for both on and off positions.
– This switch must be accessible by the driver and safety personnel from outside the vehicle.
(9) There are no restrictions on vehicle weight.
(10) These vehicles may have custom made frames and bodies.
– All frames must be of good quality design and fabrication.
(11) The driver of the vehicle shall be seated between the front and rear axles.
(12) All flywheels must be covered with an NHRA approved scatter shield/blanket and labeled with proper SFI label or equivalent as specified in
section 9.21 of these Supps.
(13) The driver must be shielded from any other rotating parts.
(14) This class requires roll cage as specified in section 10.4 of the Supps.
This class is for production electric vehicles and they must be run as manufactured with the exception of the safety requirements listed below.
1. No hybrid vehicles will be allowed, vehicle must operate totally on electricity, no other fuel may be used.
2. No modification to the vehicle is allowed except for the safety changes listed below.
3. All flywheels must be covered with an NHRA approved scatter shield/blanket and labeled with proper SFI label or equivalent as specified in section 9.21 of these Supps.
4. The driver must be shielded from any other rotating parts.
5. This class requires a minimum of a roll bar as specified in section 10 of the Supps.

As you can see, there’s a spot for almost anyone. This makes it easy for almost anyone to start out, contact us if you need specific information or want to know more. For more details about classing and detailed information go to our Rules page on our site.