Modders, merge if necessary...
Breakdown (as taken from the SOLO Rules):
The Street Touring category provides a natural competition outlet for auto enthusiasts using affordable sports cars and sedans equipped with common suspension and engine modifications compatible with street use.
Some notable modifications that separate Street Touring from Street are the following:
- Street only allows one substitution, addition, or removal of a single anti-roll bar
- Street only allows suspension adjustments of factory adjustment arrangement (implying no camber arms/plates)
- Street does not allow any changes to electronic engine management system (no ECU tuning)
- Street only allows replacement or removal of air filter element, but the air filter system itself must be O.E. (no ram/cold air intake)
- Street only allows exhaust modifications after the catalytic converter; if the catalytic converter is replaced it must be O.E.
- Street Touring allows replacing driver and/or passenger seat provided the seating surface is fully upholstered and the seat+mounting unit altogether weighs at least 25 lb
- Street Touring allows substitution, addition, or removal of any roll-bars
- Street Touring allows adjustable camber arms and camber plates
- Street Touring allows relocation and replacement of battery (can be any weight but must put out same voltage as O.E. battery)
- Street Touring allows reprogrammed ECU and changing of VTEC crossover point
- Street Touring only allows air intake modifications up to the throttle body (yes to ram/cold air intakes, but no mods to throttle body, intake manifold, no port-matching, no thermal gaskets, etc)
- Street Touring allows the rolling (but not flaring) of fenders for additional tire clearance
- Street Touring allows modded exhaust headers (or in our case down-pipe) and catalytic converts provided the catalytic converter have a minimum catalyst density of 100 cells per inch, min. substrate length of 3-inches, and positioned within 6-inches of the original O.E. catalytic converter.
Starting in 2015, a minimum UTQG 200 tread rating required on street tires.
There are six (6) Street Touring classes and the 9th gen Civic falls into two (2) of them:
- Street Touring FWD (STF) - The 9th gen R18 Honda Civic (non-Si) falls into this class; other notable vehicles in this category include (but not limited to) Mazda Mazda3, Volkswagen Rabbit/Golf (non-GTI), Ford Focus (non-ST), Scion tC, Mitsubishi Lancer (non-turbo), Subaru Impreza (non-WRX/STI). This class allows a maximum tire width of 225 mm.
- Street Touring Compact (STC) - This category is for small displacement compacts, mostly of the '80s/'90s with a few exceptions like the new Fiat 500 and Kia Rio.
- Street Touring Sport (STS) - This category is quite niche... includes Pontiac Fiero (4-cylinder), Toyota MR2 (non-Spyder), Honda Civic del Sol...
- Street Touring Xtreme (STX) - Ah, yes... here it is. The 9th gen K24 Honda Civic Si falls into this class; other notable vehicles in this category include (but no limited to) Scion FRS, Subaru BRZ, Mazda RX-8, Ford Focus ST, Subaru WRX (non-STI before 2009). This class allows a maximum tire width of 265 mm (245 mm for AWD).
- Street Touring Ultra (STU) - This category is one better than STX. Includes Mitsubishi Lancer Evo, Subaru Impreza WRX STI, Hyundai Genesis, Ford Mustang...
- Street Touring Roadster (STR) - As you can imagine, this category includes the Honda S2000. But it also includes some Porches, Datsun Fairladies, Mazda Miata and RX7...
I've only witnessed one regional event at the Houston Police Academy. I was saddened not see not one 8th or 9th gen Civic.
Let's discuss car set ups and other related topics here! Suspension adjustments like camber, toe, and caster. Tire brand, tire pressure, tire/rim sizes (STF allows up to 225 wide tires, STX allows up to 265 wide tires). Weight reduction/balance. Brake rotors, brake pads. Bolt-ons, etc.