"Boxster Spec Racing” BSR Class Rules for 2010

Class Purpose
The purpose of this Spec Class is to provide a competitive racing 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 referred to as the BSR class.

General Rules
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.

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

Sanctioning Body Classing
The following sanctioningbodies have adopted these rules as stated and assigned the following classes:

• Porsche Owners Club = BSR
• SCCA (San Francisco Region) =BSR
• Porsche Club America = SPBOX

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

Electrical cutoff switches are required.

A 5-point or 6-point harness is required 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.

A window net or arm restraints are required.

A front tow hook or strap is required. Rear tow hooks or straps are highly recommended.

Front hood pins required.

Roll Cages
Roll cages are required and may be of weld-in or bolt-in type. Cages must have a minimum of six connection points to the chassis. Typical connection points are (4) at the base of the main roll cage and (2) at the rear shock towers. Attaching to the windshield frame or B pillar is allowed. (*If you plan on racing your BSR in other production classes, please review the cage attachment rules for that class. More than 6 attachments points and the location of the attachment points may bump the car into an unplanned for class).

Each mounting plate shall not be greater than 100 square inches and shall be no greater than (12) inches or less than (2) inches on a side. Mounting plate material must be a minimum .080” thickness cold rolled steel. Any portion of the cage that could come into contact with the driver’s helmet must be covered with high-density foam with a minimum thickness of .75”.

Minimum Roll Bar Tubing Sizes: Mild Steel: 1.75” X .095 or 1.5 X .120 wall Alloy Steel 1.50” X .095” wall

Approved Bolt-in Roll cages: Safety Devices Part # SD-P986 AutoPower Part# TBD

Welded-in roll cages are recommended.

Weight
Minimum weight requirements must be met immediately following all qualifying sessions and races. 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. No drilling or sawing of metal body panels unless specifically allowed. Minimum weight includes driver. Spare tires may be removed. Ballast to meet minimum weight must not exceed 75lbs, distributed as follows (please note, bolting down 25lbs of ballast to the passenger floor with another 25lbs of securing force will not be considered to "spec");

Max 25lbs, bolted to the floor of the passenger footwell OR retain passenger seat.
Max 50lbs, bolted to the floor, directly behind the Driver's seat.

Minimum weight = 2650 Lbs. Including driver

Chassis
Seam welding of the chassis is not allowed.

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

Cooling System
Ethylene glycol-based anti-freeze is prohibited. Distilled water is recommended as a replacement. 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 Pressure
The use of an Accusump oil accumulator is allowed.

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

• External oil cooler
• Upgrade to a Boxster S oil cooler
• Brey Krause deep sump oil pan

Air Filter
No modifications to the factory engine air inlet or intake system. Drop in factory size/style replacement air filters only.

Fuel Tank and Filler
Must remain in the stock location.

Pulley/Belt System
Under drive crank pulley allowed, minimum 4" diameter. No modification allowed to: water pump, power sterring pump alternator, idler pulleys etc and all must be operable and belt driven.

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
Exhaust manifolds must remain stock. All other components are free.

Catalytic converters may be removed.

Transmission / Differential
Transmission
v. G86/00
Must remain stock with unmodified components (no coatings or non-stock parts). May be rebuilt but must retain stock gear ratios.

Ratios:

• (1st) 10:35 = 3.500
• (2nd) 17:36 = 2.117
• (3rd) 28:40 = 1.428
• (4th) 34:35 = 1.029
• (5th) 38:30 = .789
• Final drive is 9:35 = 3.889

Clutch
Any approved clutch disc and clutch cover (pressure plate) may be used. Approved lightened flywheels are allowed.

Approved clutch kits:

• Factory replacement part number: 986 116 911 00 (For use with stock flywheel or Aasco lightened flywheel) - Contains (1) clutch disc, (1) pressure plate and (1) release bearing
• Sachs Performance Clutch Spring Centered part number: 88 1861 000 017 (For use with Aasco lightened flywheel)
• Sachs Performance Sport Pressure Plate part number: 88 3082 999 754 (For use with Aasco lightened flywheel)

Approved lightened flywheels:

• Aasco: 106412-11
• Fidanza: 914572 (currently a discontinued product but stock available through parts distributors)

Differential
Must remain stock.

Shifters
Short-shift kits are allowed but not recommended. Shifter base may be raised. Shift cables must remain stock length.

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.

Strut braces are not allowed.

Camber plates are not allowed.

(Cars with camber plates grandfathered for the 2009 must remove the camber plates for 2010.)

A-Arms
Approved adjustable A-arms are allowed for the purpose of increasing negative camber in the front and rear wheels. The approved adjustable A-Arms are Porsche Factory Parts only for the GT3 “Street”.

Springs and Shocks
Shocks: Bilstein PSS9 part number F4-GM5-8847-H0 only. No in-cockpit adjustability. Stock valving only.

Springs may be changed only to:

• Front 450 lbs
• Rear 500 lbs

Approved Spring part numbers:

Front Springs:

Rear Springs:

Manufacturer	Part #		Manufacturer	Part #
Swift	Z70-152-080		Swift	Z70-152-090
Swift	Z70-178-080		Swift	Z70-178-090
Swift	Z70-203-080		Swift	Z70-203-090
Swift	Z65-152-080		Swift	Z65-152-090
Swift	Z65-178-080		Swift	Z65-178-090
Swift	Z65-203-080		Swift	Z65-203-090
Swift	Z60-152-080		Swift	Z60-152-090
Swift	Z60-178-080		Swift	Z60-178-090
Swift	Z60-203-080		Swift	Z60-203-090
Eibach	0500.250.0450		Eibach	0500.250.0500
Eibach	0600.250.0450		Eibach	0600.250.0500
Eibach	0700.250.0450		Eibach	0700.250.0500
Eibach	0500.225.0450		Eibach	0500.225.0500
Eibach	0600.225.0450		Eibach	0600.225.0500
Eibach	0700.225.0450		Eibach	0700.225.0500
Hypercoil	5A0450		Hypercoil	5A0500
Hypercoil	6A0450		Hypercoil	6A0500
Hypercoil	7A0450		Hypercoil	7A0500
Hypercoil	8A0450		Hypercoil	8A0500
Hypercoil	7B0450		Hypercoil	7B0500
Hypercoil	8B0450		Hypercoil	8B0500

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

Sway Bars
Approved sway bars:

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

No modification to mounting points.

Drop Links Approved drop links:

• Front: Tarett Engineering #996FDLNK, Tarett Engineering GT3 "long links #EXTFDLNK or modified stock
• Rear: Tarett Engineering #996RDLNK or stock

(modified stock allows for a shortening of 2" for use with GT3 front sway bars)

Must mount to stock shock location

Toe Links

• Rear: Stock or Tarett Engineering # 996TLNK

Ride Height

• Front: Minimum 90mm as measured at front cross of aluminum cross member (all parts and bolt heads)
• Rear: Minimum 90mm as measured at front-to-rear braces, near sway bar (all parts and bolt heads)

Wheels and Tires
Wheels
Any factory or aftermarket 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. Wheel spacers are not allowed. Hubs may be converted to studs in place of wheel bolts.

Tires
Toyo R888

• Front: 225x45x17
• Rear: 255x40x17

Tire Usage

*Tire Maximum Suggestion

Maximum four (4) new tires per competitor per event. An Event will be defined as "Up to two (2) each: qualifying, time trials, sprint races." (i.e. the 4 tires you qualify with on Saturday are the tires you race on Saturday and qualify and race with on Sunday). A damaged tire can be replaced with any Toyo R888 of like size.

This suggestion is not applicable to Enduros.

Regions will self-police. Consult regional Rules rep.

*(this is a suggested practice for 2010, subject to the discretion of sanctioning body and/or it’s regional representatives).

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.
Stock replacement rotor, steel construction. One piece design. Drilled or slotted allowed.
Brake calipers must remain completely stock and sit in factory location.

Battery
Stock location, min 10lbs.

Data Acquisition and In-car Timing Equipment
Allowed.

Appearance
The class nomenclature of BSR 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 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
• 996 Carrera 2 (same as found on US delivered 1999 C2 model)

Deck lids must remain stock.

Boxster Spec Bodywork

Splitters / Side Skirts
GT3 style factory part # 996-505-986-91 or clone only.

Splitters may not extend forward of the front bumper, nor lower than 3” from the bottom of the front bumper. The front bumper must be located in the factory position and cannot be moved in any way. Factory or factory replacement side skirts allowed.

Hardtops
Hard tops are mandatory and may be either factory or aftermarket fiberglass replicas of the factory roof with factory profile. No carbon fiber. Rear Window must be stock in appearance with no venting (can be lexan material).

Exterior
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 must be left in the upright position. Rear spoiler lift motor may be removed.

Rear bumper license plate area may be cut out to 27" wide by 7" tall max. Tow hook hole max 6" x 3". No other modifications permitted.

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 must 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. 996 instrument cluster may be used. Factory navigation systems and all airbags may be removed. Non-visible bottom edge may be removed to allow easier under-dash access.

Any steering wheel may be used except wood rimmed type steering wheels. Quick release steering hubs are allowed. Steering wheel lock must be removed.

The air conditioning/heating system may be removed.

Factory engine cover must remain in the stock and latched position.

All interior items may be removed except where otherwise noted. The driver’s side floor mat must be removed. Both doors may be “gutted.” Factory door beams must remain intact or NASCAR style side intrusion door bars must be added.

All insulating material may be removed from the interior.


Rules Revision Process
The Boxster Spec Racing Rulebook will be controlled by PCA and POC with hopes of ongoing cooperation that will result in a continued unified Spec. The two sanctioning bodies will receive input from the BSR Rules Committee through the Sanctioning Body Liaison.

The BSR Rules Committee will consist representative of every region wherein there are a significant number of Boxster Spec cars. Minimum Rules Committee configuration: 2 builders, 3 drivers.

The Rules Committee will collect and assess rules change suggestions from the active drivers on an annual basis per the following guidelines:

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

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

July 1
Rules change suggestions for the following season will be forwarded to the PCA/POC by the BSR Sanctioning Body Liaison for consideration by the respective organizations.

October
The sanctioning bodies’ decisions will be announced and posted to all available Boxster Spec websites. 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 BSR Rules Committee shall meet, to rule on that issue and subsequently notify all Sanctioning Bodies of the rule amendment. Best efforts via email and website posts will be made to inform all drivers of any changes.

(Rev 7 - 10/3/09)