-Chris
Quote:
As long as it's a stock cat in the stock location, I think you are good for STS on street tires or DSP with the 2wd 3.0L catch all.
SCCA rules per web sites pdf wrote: 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 a natural competition outlet for auto enthusiasts
using affordable sports sedans equipped with common suspension,
engine, and appearance modifications which are fully legal and
compatible with street use anywhere in the country. “Dress-up”
items such as chrome dipsticks and non-standard filler caps are
permitted, provided they serve no other purpose.
Vehicles eligible for this category must meet the Stock category
eligibility requirements, and include all coupes/sedans with a minimum
of four seats and four seat belts, that are non-sports car based
with a maximum engine displacement of 3.1 liters, are normally
aspirated; and the small-displacement turbocharged sedans referenced
in Appendix A. 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. As a guideline, eligible cars would typically
come from the D, F, G or H-Stock classes. Note that 3.2 ‘VEHICLE
CLASSIFICATION’, also applies to the Street Touring Category,
including adding or removing cars from the exclusion lists.
Vehicle eligibility lists are now in Appendix A.
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 the use of Technical Bulletins in SportsCar
magazine at the earliest possible date.
See Sections 3.8 and 8.3 for documentation requirements.
14.1 AUTHORIZED MODIFICATIONS - STS
A. All Solo Rules Stock Category allowances, plus all allowances
contained in 14.1 through 14.10.
B. Air conditioning systems may be removed in whole or in part.
This rule should not be interpreted to allow modification of the
heater system.
14.2. BODY WORK
A. Pedal kits and other interior cosmetic accessories may be added.
B. The driver and front passenger seats may be replaced, with the
following restrictions: The seating surface must be fully upholstered:
The top of the seat, or an attached headrest, may not bebelow the center of the driver’s head. The seat, not including
mounting hardware, must weigh at least 15 pounds.
C. Removal of factory trim (rub strips, emblems, mud flaps) is
allowed.
D. Alternate steering wheels are allowed except that steering
wheels with an integral airbag may not be changed.
E. Fenders may not be cut or flared but the inside lip may be rolled
to gain additional tire clearance. Flares that are part of body kits
may be attached to the stock fenders. The intention is to permit
fitting the maximum allowable tire size. No other changes to the
stock fenders or wheel wells are permitted. Wear marks on
inside surfaces of the fender well from tire rub are permitted.
However, wear holes or slots completely through a fender well
surface (which, in effect, provide additional tire clearance) are
not permitted.
F. Addition of spoilers, splitters, body kits, rear wings and nonfunctional
scoops/vents is allowed. The intent of this allowance
is to accommodate commonly available appearance kits, and
replicas thereof, which have no significant aerodynamic function
at Solo speeds. Body kits are limited to bumper covers, valances,
side skirts, and fender flares. Standard parts may not be
removed except for the substitution of spoilers, rear wings,
bumper covers and valances. Rear wings must attach only aft of
the rear wheel centerline. Total surface area of all spoilers, splitters
and rear wing may not exceed 8 square feet as seen from
above (see 12.9). Substitution of rear spoilers or wings must
retain any original third brake light functionality unless otherwise
equipped. No underbody panels may be added or substituted.
The drilling of holes for the purpose of mounting these
pieces is permitted.
14.3 TIRES
Tires must meet the eligibility requirements of the Stock category (excluding
13.3.F), with the following additional restrictions:
A. Tires may have widths up to and including 225.
B. Tires must have a minimum tread wear rating of 140.
C. Tire models must not appear on the following list, which may be
altered at any time by the SEB upon notification of the membership.
Pirelli P Zero Corsa
14.4 WHEELS
A. Any wheels up to 7.5" in width that fit over stock brakes.
14.5 SHOCK ABSORBERS
A. Shock absorber bump stops may be altered or removed.
B. Any shock absorbers may be used. Shock absorber mounting
brackets which serve no other purpose may be altered, added, or
replaced, provided that the attachment points on the body/
frame/subframe/chassis/suspension member are not altered.
This installation may incorporate an alternate upper spring
perch/seat and/or mounting block (bearing mount). The system
of attachment may be changed. 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 original
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.
14.6 BRAKES
A. Cross drilled and/or slotted brake rotors are permitted, same size
and type as standard.
B. Brake lines may be substituted with alternate DOT approved
flexible brake lines.
C. 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.
D. Original equipment ABS braking systems may be electrically
disabled, but may not be removed or altered in any other way.
14.7 ANTI-SWAY BARS
Substitution, addition, or removal of any anti-roll bar(s) is
permitted. Bushing material, method of attachment, and locating
points are unrestricted. Components such as anti-roll bars and strut
housings that serve dual purposes by also functioning as
suspension locators may not be modified in ways that change the
suspension geometry or steering geometry. Non-standard lateral
members which connect between the brackets for the bar are not
permitted.
14.8 SUSPENSION
A. 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 that 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. This permits multiple springs,
as long as they use the original mount locations. 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
bump stops may be altered or removed.
B. 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 accommodate 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.
C. The following allowances apply to 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 plates are permitted.
D. Differential mount bushings may be replaced, but must attach in
the factory location(s) without additional modification or
changes. Differential position may not be changed. The amount
of metal in a replacement bushing may not be increased relative
to the amount of metal found in a standard bushing for the
particular application. Solid metal bushings are specifically
prohibited.
E. Transmission mounts may be replaced, but must attach in the
factory location(s) without additional modification or changes.
Transmission position may not be changed. The amount of
metal in a replacement mount may not be increased relative to
the amount of metal found in a standard mount for the particular
application. Solid metal mounts are specifically prohibited.
F. Steering rack bushings may be replaced, but must attach in the
factory location(s) without additional modification or changes.
Steering rack position may not be changed. The amount of
metal in a replacement bushing may not be increased relative to
the amount of metal found in a standard bushing for the particular
application. Solid metal bushings are specifically prohibited.
This does NOT allow shimming or otherwise relocating the
steering rack.
G. Camber bolts may be installed providing these parts use the
original, unmodified mounting points and meet the restrictions
specified in 14.5.B. Caster changes resulting from the use of
camber bolts are permitted.
H. Live axle suspension allowances:
1. Addition or replacement of suspension stabilizers (linkage
connecting the axle housing or DeDion to the chassis, which
controls lateral suspension location) is permitted.
2. Traction bars or torque arms may be added or replaced.
3. A Panhard rod may be added or replaced.
4. The upper arm(s) may be removed, replaced, or modified,
and the upper pickup points on the rear axle housing may be
relocated.
5. The lower arms may not be altered, except as permitted
under 14.8.C, or relocated. Methods of attachment and attachment
points are unrestricted, but may serve no other
purpose (e.g. chassis stiffening). This does not authorize
removal of a welded-on part of a subframe to accommodate
the installation.
I. Camber kits, also known as camber compensators, may be
installed. These kits consist of either adjustable length arms or
arm mounts that provide a lateral adjustment to the effective
length of a control arm. Alignment outside the factory specifications
is allowed. The following restrictions apply:
1. On double/unequal arm (e.g. wishbone, multi-link) suspensions,
only the upper arms OR lower arms may be modified
or replaced, but not both. Non-integral longitudinal arms that
primarily control fore/aft wheel movement (e.g. trailing
arm(s) or link(s) of a multi-link suspension) may not be replaced,
changed, or modified.
2. On arm-and-strut (MacPherson/Chapman) suspensions, the
lower arms may be modified/replaced OR other methods of
camber adjustment as allowed by paragraphs 14.8.B, C, or G
may be used, but not both.
3. On swing or trailing arm suspensions, the main arms may not
be modified or replaced, but lateral locating links/arms may
be modified or replaced.
4. The replacement arms or mounts must attach to the original
standard mounting points. All bushings must meet the requirements
of 14.8.B. Intermediate mounting points (e.g.
shock/spring mounts) may not be moved or relocated on the
arm, except as incidental to the camber adjustment. The
knuckle/bearing housing/spindle assembly cannot be modified
or replaced.”
Note: Many modern suspension designs known by other names,
actually function as double A-arm designs. These include the
rear suspensions on 88+ Honda Civic/Integra, Neon, E36
BMW, and most “multi-link” and are covered by 14.8.I.1.
J. Changes in alignment parameters that result directly from the
use of the allowed components are permitted. For example, the
dimensional changes resulting from the use of a cylindrical
offset bushing that meets the restrictions of 14.8.B are allowed,
including those resulting from a change in the pivoting action to:
(1) about the mounting bolt, or
(2) about the bushing itself.
K. Subframe mount bushings may be replaced, but must attach in
the factory location(s) without additional modification or
changes. Subframe position may not be changed. The amount
of metal in a replacement bushing may not be increased relative
to the amount of metal found in a standard bushing for the
particular application. Solid metal bushings are specifically
prohibited.
L. 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. Interior trim panels
may be modified to allow installation of strut bars. Holes or
slots may be no larger than necessary and may serve no other
purpose. This does not permit any modifications to the frame or
unibody beyond the allowed mounting holes.
14.9 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.
14.10 ENGINE
Engine and transmission must remain unmodified, including emissions
equipment, except as noted below:
A. Internal baffling of oil pans may be added or modified. Addition
or modification of windage trays, crankshaft scrapers, and oil
pump pickups is not allowed.
B. Original equipment traction control systems may be electrically
disabled, but not removed or altered in any other way.
C. The air intake system up to, but not including, the engine inlet
may be modified or replaced. The engine inlet is the throttle
body, carburetor, compressor inlet, or intake manifold, whichever
comes first. The existing structure of the car may not be
modified for the passage of ducting from the air cleaner to the
engine inlet. Holes may be drilled for mounting. Emissions or
engine management components in the air intake system, such
as a PCV valve, or mass airflow sensor, may not be removed,
modified, or replaced, and must retain their original function
along the flow path.
D. Exhaust manifolds and headers may be replaced with alternate
units which are emissions-legal. Relocation of the oxygen sensor
on the header is permitted. Alternate oxygen sensors, including
heated types, are permitted. This allowance does not
permit relocation of the catalytic converter (see 13.10.E). Exhaust
heat shields may be modified the minimum amount necessary
to accommodate allowed alternate exhaust components.
E. The engine management system parameters and operation may
be modified only via 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. Boost changes indirectly resulting from allowed
modifications are permissible, but directly altering or modifying the
boost or turbo controls, either mechanically or electronically,
is strictly prohibited.
1. Reprogrammed ECU may be used in the standard housing.
Traction control parameters may not be altered. Altered
engine controllers may not alter boost levels in forced induction
engines.
2. Electronic components may be installed in-line 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 engine management system. Example: fuel
controllers that modify the signal coming from an airflow
sensor.
3. 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 pressure
regulator.
4. Ignition timing may be set at any point on factory adjustable
distributor ignition systems.
5. VTEC controllers and other devices may be used which alter
the timing of factory standard electronic variable valve timing
systems.
6. All STS vehicles must comply with the Federal 49-state safety
and tailpipe emissions test requirements as a minimum.
F. Any mechanical shift linkage may be used.
G. 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. Any crankshaft damper or pulley may be
used. SFI-rated dampers are recommended. Supercharged cars
may not change the effective diameter of any pulley which
drives the supercharger.
H. Engine mounts may be replaced, but must attach in the factory
location(s) without additional modification or changes. Engine
position may not be changed. The volume of metal in a replacement
mount may not be increased relative to the volume of
metal found in a stock mount for the particular application. Solid
metal mounts are specifically prohibited. Any non-metallic inserts
may be used.
Hydraulic shock type rear engine locators, or bobble struts may
be replaced by manufacturer’s performance part, or aftermarket
replacement part. This part must retain factory dimensions and
attachment points, including factory design. (Example: If factory
locator/bobble strut is gas or hydraulic piston type, replacement
part must be gas or hydraulic piston type. No solid mounts may
be substituted.)
