II Street Touring Category
This is an unofficial transcription of Section 17 of the
2003 SCCA National
Solo Rules. (Copyright Sports Car Club of America
2003; all rights reserved;)
It is believed to be correct, but any questions should be referred to the
official rules as published by the SCCA. Order
your own copy here.
Changes since the
Rules are shown like
Further changes from FasTrack are shown like
17. STREET TOURING CATEGORY
The Street Touring category of vehicle modifications is meant to fit between
the current Stock and Street Prepared categories. This category provides
an natural competition outlet for auto enthusiasts using affordable sport
sedans equipped with common suspension, engine, and appearance modifications
which are fully legal and compatible for street use anywhere in the country.
Vehicles for this category include all coupes/sedans with a minimum
of four seats, four seat belts; that are not sports car based, with a maximum
engine displacement of 3.1 liters, normally aspirated and certain small displacement
turbocharged sedans. No limited slip differentials are permitted
except for factory standard viscous coupler type units.
A sports car based vehicle would include those that are 2+2 variants
of 2 seat sports cars.
All vehicles meeting the above criteria
Audi A4 1.8T, non-Quattro
Mazda 323 GTX(awd)
Mazda 323 GT
Volvo S40 and V40
SAMPLE EXCLUDED VEHICLES
This category consists of two classes:
Datsun Z car 2+2
a full National class, Street Touring S (STS), and
a Regional-level optional class, Street Touring
Under the provisions of Section
1.1 of these rules, regions are free to allow the previously-listed STR
class or any other version of the ST concept which meets their local needs.
If these rules contain errors, oversights, or omissions, the Solo Events
Board and the National Office will make the necessary corrections through
use of Technical Bulletins in SportsCar
magazine at the earliest possible date.
17.1. AUTHORIZED MODIFICATIONS
All Solo II Rules Stock Category allowances and the modifications that
A. Equipment and/or specifications may be exchanged between different years
and models of a vehicle if:
(1) the item is standard on the year/model from
which it was taken,
(2) the years/models are listed on the same line
of Appendix A (Street Prepared Classes)
The updated/backdated part or the part to which it is to be attached
may not be altered, modified, machined, or otherwise changed to facilitate
the updating/backdating allowance. The updating and/or backdating
of engines, transmissions, or transaxles must be done as a complete
as available from the factory, including
those items required by emissions regulations for a particular configuration.
Example: the Neon throttle body used on automatic transmission cars
cannot be used on a manual transmission car. Component parts of these
units may not be interchanged. Cars
not listed in the Street Prepared sections
of Appendix A may not be updated/backdated until approved by the SEB
and published in SportsCar
Air conditioning systems may be removed in whole or in part. This rule
should not be interpreted to allow modification of the heater system.
17.2. BODY WORK
Pedal kits and other interior cosmetic accessories may be added.
Any fully padded and upholstered front seats with reclining seat backs,
rear seats may not be removed.
Removal of factory trim (rub strips, emblems)
Alternate steering wheels are allowed except that steering wheels with
an integral airbag may not be changed.
Fenders may not be cut or flared but the inside lip may be rolled in order
to gain tire clearance. Flares that are part (left
out of rulebook for
2003, but I predict it will return...Ed.) of body kits may be attached to the stock fenders. The intention
is to allow cars to maximize tire width up to the maximum allowable size.
No other changes to the stock fenders or wheel wells are permitted.
Spoilers, body kits, rear wings, etc.
Tires up to and including a width of 225.
Tires must have a minimum tread wear rating of 140.
13.3.F is not applicable to the Street Touring Rules
Any wheels up to 7.5" in width that fit over stock brakes
17.5. SHOCK ABSORBERS
Shock absorber bump stops may be altered or removed.
Any shock absorbers may be used, provided they attach to the original mounting
points. The number of shock absorbers shall be the same as Stock. No shock
absorber may be capable of adjustment while the car is in motion, unless
fitted as orignal equipment. MacPherson strut equipped cars may substitute
struts, and/or may use any insert. This does not allow unauthorized changes
in suspension geometry or changes in attachment points (e.g., affecting
the position of the lower ball joint or spindle). It is intended
to allow the strut length changes needed to accommodate permitted modifications
which affect ride height and suspension travel.
Cross drilled or slotted brake rotorsare permitted, same size and type
Alternate DOT approved flexible brake lines.
Air ducts may be fitted to the brakes, provided that they extend in a forward
direction only, and that no changes are made in the body/structure for
their use. They may serve no other purpose.
17.7. ANTI-SWAY BARS
Any anti-sway bar is permitted. Bushing material, method of attachment,
and locating points are unrestricted. This does not
authorize removal of a welded-on part of a subframe toa ccommodate the
installation. Components such as anti-roll bars and strut housings which
serve dual purposes by also functioning as suspension locators may not
be modified in ways which change the suspension geometry or steering geometry
Ride height may only be altered by suspension adjustments, the use of spacing
blocks, leaf spring shackles, torsion bar levers, or change or modification
of springs or coil spring perches. This does not allow the use of spacers
which alter suspension geometry, such as those between the hub carrier
and lower suspension arm. Springs must be of the same type as the original
(coil, leaf, torsion bar, etc.) and except as noted herein, must use the
original spring attachment points. Coil spring perches originally attached
to struts or shock absorber bodies may be changed or altered, and their
position may be adjustable. Spacers are allowed above or below the spring.
Suspension bushings may be replaced with bushings
of any materials (except metal) as long as they fit in the original location.
Offset bushings may be used. In a replacement bushing the amount of metal
relative to the amount of non-metallic material may not be increased. This
does not authorize a change in type of bushing (for example ball and socket
replacing a cylindrical bushing), or use of a bushing with an angled hole
whose direction differs from that of the original bushing. If the
Stock bushing accommodated multi-axis motion via compliance of the component
material(s), the replacement bushing may not be changed to accomodate such
motion via a change in bushing type, for example to a spherical bearing
or similar component involving internal moving parts. Pins or keys may
be used to prevent the rotation of alternate bushings, but may serve no
other purpose than that of retaining the bushing in the desired position.
On vehicles with strut-type suspensions, adjustable camber plates may be
installed at the top of the strut, and the original upper mounting holes
may be slotted. The drilling of holes in order to perform the installation
is permitted. The center clearance hole may not be modified. Any type of
bearing or bushing may be used in the adjustable camber plate attachment
to the strut. The installation may incorporate an alternate upper spring
perch/seat and/or mounting block (bearing mount). Any ride height change
resulting from installation of camber plates is allowed. Caster changes
resulting from the use of camber places are permitted
Addition or replacement of suspension stabilizers (linkage connecting axle
or De Dion to the chassis which controls lateral suspension location) is
permitted. Traction bars or torque arms may be added or replaced. A Panhard
rod may be added or replaced. Methods of attachment and attachment points
Camber kits may be installed on vehicles that do not have McPherson strut
type suspensions. These kits may include replacement control arms or other
parts that are designed specifically to compensate for camber changes resulting
from lowering the car. These parts must use the original attachment points.
Changes in alignment parameters which result directly from the use of allowed
components are permitted. For example, the dimensional changes resulting
from the use of a cylindrical offset bushing which meets the restrictions
of 17.8.B (there is no 3.E -- Ed.) are allowed, including
those resulting from a change in the pivoting action to
(a) about the mounting bolt, or
(b) about the bushing itself.
Strut bars are permitted with all types of suspension. Strut bars may be
mounted only transversely across the car from upper right to upper left
suspension mounting point and from lower right to lower left suspension
mounting point. No other configuration is permitted. Additional holes may
be drilled for mounting bolts. Only bolt-on attachment is permitted.
17.9. ELECTRICAL SYSTEM
The make, model number, and size of the battery may be changed but not
its voltage. Relocation of the battery or batteries is permitted but not
into the passenger compartment. If the battery is relocated and the original
battery tray can be removed by simply unbolting it, the tray may be removed,
or relocated with the battery. Holes may be drilled for mounting
or passage of cables. Longer cables may be substituted to permit relocation.
The number of battery or batteries may not be changed from stock. The area
behind the rearmost seat is not considered to be within the passenger compartment.
Engine and transmission must remain unmodified, including emissions equipment,
except as noted below:
Alternate air cleaner enclosures up to carburetor or throttlebody.
does not allow any changes to intercoolers.
The engine management system parameters and
operations may be modified only by the methods listed below. Any and all
modifications must meet or exceed the applicable US DOT emissions standards for
the year, make, and model of the car. These allowances also apply to
forced induction cars, except that no changes to standard boost levels,
intercoolers, or boost controls are permitted.
- Reprogrammed ECU may be used in the standard
housing. Traction control parameters may not be altered.
- Electronic components may be installed inline
between an engine's sensors and ECU. These components may alter the
signal coming from the sensor in order to affect the ECU's operation of the
engine management system. Example: fuel controllers that modify the
signal coming from an airflow sensor.
- Fuel pressure regulators may be replaced in
lieu of electronic alterations to the fuel system. It is not permitted
to electronically modify the fuel system AND replace a fuel presure
- Ignition timing may be set at any point on
factory adjustable distributor ignition systems.
- VTEC controllers and other devices may be used
which alter the timing of factory standard electronic variable valve timing
mass airflow sensor must remain in its approximate original location.
All STS vehicles must comply with the Federal
49-state safety and tailpipe emissions test requirements as a minimum.
Short throw shift kits may be installed.
Any accessory pulleys and belts of the same type (e.g., V-belt, serpentine)
as standard may be used. This allowance
applies to accessory pulleys only (e.g., alternator, water pump, power
steering pump, and crankshaft drive pulleys). It does not allow replacement,
modification, or substitution of pulleys, cogs, gears, or belts which are
part of cam, layshaft, or ignition drive or timing systems, etc.
The STX class expande the vehicle eligibility limits
beyond those specified for STS, and adds a limited number of allowed
All allowances in STS
carry over, including street tires, emissions, etc.
All restrictions regarding body
type carry over.
Engine size allowance: up to
5.1, normally aspirated and 2.0, forced induction (single turbo or
Only factory limited slip
differentials (LSD) are allowed on AWD vehicles, as defined in Section 12.4.
For AWD vehicles that did not come with any type of limited
slip differential (including center differential or transfer case), a single
aftermarket LSD may be added.
vehicles may use any LSD unit.
High flow catalytic converters
are allowed, but must attach within six inches of the original unit.
Alternate motor mounts and/or
engine locators (bobble struts) sold by the vehicle's manufacturer or their
Motorsports subsidiary or affiliate ( Chrysler/Mopar, Toyota/TRD , Honda/Mugen,
etc.) are allowed.
Alternate driver and front
passenger seats are allowed, but they cannot be constructed of a solid outer
shell and must have a suspended bottom cushion and be fully upholstered.
Brake rotors and calipers are
unrestricted, but must attach to the original attachment points.
Additionally excluded cars: BMW
M3 (E36 and E46), BMW M5
...Jerry Mouton || email@example.com
|| Last modified