“Boxster Spec-X” BSX Class Rules for 2009

Class Purpose
The purpose of this Spec Class is to provide a competitive "up-to-spec" class where the cars are reliable and performance potential is as even as possible. These rules are intended to control costs and remove any performance advantage from the cars so that driving ability and suspension set up are the greatest factors in determining race winners. This class will be named BSX. The BSX class is designed for Time Trial, DE and Auto X events.

General Rules
BSX Spec is an "up-to" spec, you may run stock OR spec parts.

ALL BSX CARS MUST BE STREET LEGAL.

All parts must be factory stock from one of the eligible years, except where otherwise noted. In general, modifications which improve aesthetics, access to systems, safety or reliability are allowed and encouraged provided they offer no performance advantage. There are no exceptions. No upgrade to any Boxster S component is allowed unless specified in these rules.

Any modification not expressly covered by these rules is prohibited.

NO MODIFICATION OF SPEC PARTS PERMITTED

NON-STOCK PARTS CAN HAVE NO POTENTIAL FOR AERODYNAMIC IMPACT

Eligible Models
1997-1999 Porsche 986 Boxster. 2.5 motor Part # M96.20

Safety
All safety requirements are subject to the rules of the event sanctioning body.

A 5-point or 6-point harness is recommended for all seats installed in the car. 3” lap belts and 3” shoulder harnesses or a HANS specific 3-2-3 belt, and a minimum single 2” anti-submarine strap. Harnesses must be attached either to the chassis using large backing washers, or to the roll cage, but not directly to the seats or seat rails.

Roll Bar/Roll Cage
All BSX cars must have as minimum rollover protection the Brey-Krause R-3010 roll bar extensions bolted to factory equipment roll hoops and padded as per PCA rules. Roll cages are optional.

Weight
Minimum weight requirements must be met immediately following all timed sessions. The choice of which systems/accessories to remove, in order to lighten the chassis, is free. Batteries may be swapped for a lighter type, but must be securely mounted in the stock location. Minimum weight includes driver. Spare tire may be removed. Ballast to meet minimum weight must not exceed 25lbs. Ballast must be bolted to the floor of the passenger footwell.

Minimum weight = 2975 Lbs. Including driver

Engine
General
All engines and their mechanical and electrical components must remain stock. No solid engine or transmission mounts are allowed. Engine and Transmission must remain in their stock location.

Cooling System
Use of additives, such as Redline Water Wetter is permitted. Radiator fans may be direct wired with a switch.

Radiator
One additional radiator, placed in the center of the grill area is allowed. Boxster S or 996 center radiator is allowed as an addition only to the stock radiators.

Oil Cooling
The factory oil cooling system must remain stock, except for the following allowed modifications:

• An external oil cooler is allowed
• Upgrade to a Boxster S oil cooler

Air Filter
No restrictions.

Fuel Tank and Filler
Must remain in the stock location.

Pulley/Belt System
Underdrive crank pulley allowed and recommended. Minimum 4" diameter. No modification allowed to water pump,power steering pump, alternator, idler pulleys etc. and all must be operable and beltdriven.

Computer Engine Management System
The stock computer engine management system must remain stock. No other engine management system may be added. No aftermarket chips are allowed. No re-mapping or flashing of factory chips is allowed.

Exhaust System
Any muffler may be used. All other exhaust components must remain stock. No headers are allowed.

Transmission / Differential
Transmission
May be rebuilt but must retain stock gear ratios

Clutch
Any approved clutch disc and clutch cover (pressure plate) may be used.

Approved clutch kits:

• Factory replacement
• Sachs #3000830601

Differential
Must remain stock.

Shifters
Short Shift kits are allowed but not recommended

Suspension/Steering Components
All suspension components not otherwise listed must be stock factory parts. All suspension components must be mounted in the unmodified factory original mounting locations. No urethane bushings are allowed.

Shock Tower Braces
No modification of the shock tower is allowed.

No strut braces.

Camber plates and adjustable A-Arms are not allowed.

(cars with camber plates / monoballs may apply for grandfathered status for the 2009 season with proof of purchase prior to December 2008.)

A-Arms
A-Arms must remain stock in BSX class.

Springs and Shocks
Shocks: Bilstein PSS9 and PSS10. Stock valving only.

All spring and shock systems must mount in the factory original location only.

Sway Bars

• Front: H&R 70779 OR Porsche GT3 part no. 996-343-701-90
• Rear: H&R 71779 OR Tarett Engineering 986 RSBA

Ride Height
Any ride height, providing that no metal part of the vehicle touches the ground.

Wheels and Tires
Wheels
Any factory cast aluminum rim intended for use on the Boxster matching the original offset is allowed.
Wheel weight must be equal to or greater than stock:

• Front 17x7 inch - 18.5lbs minimum - 55mm offset
• Rear 17x 8.5 inch- 20 lbs minimum - 48-50mm offset

Steel bolts or lugnuts are required. No spacers are allowed. Hubs may be converted to studs in place of wheel bolts.

Tires
Toyo R888 or any DOT street tire. Max dimensions:

• Front: 225x45x17
• Rear: 255x40x17

Brake System
Brake pads are free.
Steel braided brake lines are allowed.
Brake dust guards may be removed.
The emergency brake, lever and/or cables and all associated parts may be removed.
Brake cooling systems are allowed, provided they use only air to cool with. Air may be vented through the front air dam for brake cooling.
Any stock-sized rotor is permitted. Cross drilling or gas slotting of the rotors is allowed.
Brake calipers must remain completely stock.

Data Acquisition / In-car Timing Equipment
Is allowed.

Appearance
The class nomenclature of BSX shall appear on each side and the rear of the car in 4” contrasting letters. Car numbers shall be issued by the sanctioning club hosting the event. Numbers shall comply with the rules of the sanctioning body.
Soft convertible tops and all associated motors and assemblies may not be removed.
Air dams and bumpers must be either stock or approved replica units. No Carbon fiber is allowed.

Approved front bumpers:

• Stock
• Stock with cutout for additional radiator
• Stock or replica Boxster S996
• Deck lids must remain stock.
• Factory or factory replacement side skirts allowed. Porsche part #__________

License plates, license plate frames, license plate lights, and insignias and emblems may be removed.
Hood pins are allowed and recommended. Stock hood latches may be disabled or removed.
All headlights and taillights must remain stock. Headlights may be covered.
Rear spoiler may be left in the upright position and motor removed.
Any exterior modification that is determined to have no performance enhancing value is allowed. This includes but is not limited to radiator inlet screens, side inlet scoops and screens, ventilation ducts to brakes or to the passenger compartment.

Interior
The driver or passenger seats may be replaced with any seat suitable for competition, including a racing-type bucket seat. Factory seat tracks may be modified, reinforced or removed to facilitate replacement mountings provided they perform no other function.
Factory dashboard instrument pod must remain intact.
Additional gauges may be added.
Any steering wheel may be used except wood rimmed type steering wheels. Quick release steering hubs are allowed.
Factory airbags may be removed.
Factory engine cover must remain in the stock and latched position.
The driver’s side floor mat must be removed.
Passenger seat may be removed.
Engine cover carpet, front and reat trunck carpets may be removed.
All other interior items (floor carpet, door liners, etc.) must remain if not specifically allowed removal.

Rules Revision Process
The Boxster Spec Racing Rulebook will be revised on an annual basis following the the following guidelines.

July 1- August 31
Proposals for new rules or modifications to exisiting rules will be posted to a Rules Revisions forum on the Boxster Spec Racing website.Access to this forum will require a special permission which will be granted only to Boxster Spec drivers and builders who have been active in the series within the prior twelve months.

September
Rules proposals and discussions will be reviewed and decided by the Rules Committee.

October 1
Rules changes for the following season will be announced and posted to the Official website. The Rules Committee will consist of 2 builders, 2 drivers and the series director. At any time during the competitive season, should there be a need for immediate rules change (spec part not available, over-looked loophole being exploited etc) the Rules Committee shall meet and make a decision on that issue. Best efforts via email and website posts will be made to inform all drivers of any changes.