The official website of Boxster Spec Racing

"Boxster Spec-X" BSX Class Rules for 2010

(Final Draft)

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 referred to as the the BSX class and is designed for time trial, driver education (DE) and autocross events. BSX rules cater to those drivers that wish to use their cars for both street and track use.

NOTE: We have added "NOTES" to these rules to help you better understand your options. We have seen some spend a lot of money before they take their cars out on the track which is not necessary - a luxury but not necessity. Remember this is an "up-to-spec" so you can bring your bone stock car, plus required safety equipment and run it just the way it is. Notes are NOT considered part of the rules and should be evaluated as such.

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 EXPRESSELY COVERED BY THESE RULES IS PROHIBITED

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 bar/cage, but not directly to the seats or seat rails.

Roll Bar/Roll Cage
All BSX cars must have as minimum rollover protection the GSR Autosport GSR-BSX-001 or Brey-Krause R-3010 roll bar extensions bolted to factory equipment roll hoops and padded as per sanctioning body rules.

Roll cages are optional.

NOTE: We understand there is a desire and/or need to improve the safety in the BSX class. It is for this reason that we have left roll cages as an alternative. It is up to the sanctioning body to determine if the added roll cage structure eliminates the requirement for the roll bar extension.

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 50lbs. Ballast must be bolted to the floor of the passenger foot well or in place of passenger seat.

Minimum weight = 2950 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. 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
Brey Krause deep sump oil pan
Accusump oil accumulator is allowed

NOTE: We have seen many BSX cars run without any additional cooling. Don´t feel that this is absolutely critical to get out on the track. Monitor your temps and evaluate as needed.

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
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.

NOTE: Most BSX cars we have seen have not installed an underdrive pulley. Again, if you are doing a lot of track days, something to consider to reduce stress on belt driven components.

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 aftermarket 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, pressure plates and clutch discs:

Clutch Kit Sachs/Porsche - Part# 986 116 911 00/986 116 911 01 (For use with stock flywheel) Contains (1) clutch disc, (1) pressure plate and (1) release bearing.
Sachs "Sport" Pressure Plate - Part #88 3082 999 754
Sachs Clutch Disc "Sport" Rigid Hub w/ Organic Lining Higher Friction - Part # 88 1864 999 959
Genuine Porsche Clutch Disc - Part# 987 116 014 00

NOTE: Stock replacement parts work fine. If you don't have any issues, don't bother replacing until you have an issue.

Differential
Must remain stock.

Shifters
Short Shift kits are allowed but not recommended

NOTE: The syncro gears in the stock transaxle are a bit delicate so the added abuse of very quick shifts isn't necessary a good thing over the long haul.

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 and adjustable A-Arms are not allowed.

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

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

Springs and Shocks
Shocks: Bilstein PSS9 - Part# F4-GM5-8847-H0 only. No in-cockpit adjustability. Stock valving only. Bilstein PSS9 springs may not be changed.

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

Sway Bars

Front: H&R 70779 OR Porsche GT3 - Part# 996-343-701-90
Rear: H&R 71779 OR Tarett Engineering 986 RSBA

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)

NOTE: Shocks and sway bars are the biggest performance upgrade you will make to your BSX car, but don't think you have to make this major investment before you head out to the track. Get out and get some seat time in stock configuration. Maybe add sway bars at some point. When you are ready to go all in, pony up for the shocks. Front stock drop links can be modified and stock rear drop links work fine without modification. Toe links are again a nice to have but not necessary.

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

Or (but not recommended):

Front 16x6 inch - 50mm offset
Rear 16x7 inch- 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 or any DOT street tire with a UTOG tread wear rating of 100 or greater.

Max dimensions:

Front: 225x45x17 or 205x55x16
Rear: 255x40x17 or 225x50x16

NOTE: Tires are probably the first thing you want to upgrade to improve the performance of your BSX car. Street tires are not meant for the abuse of the track. A good set of track tires will add a lot of additional mechanical grip without having to make any permanent changes to your car - put them on to go to the track and take them off when you get home. Use your street tires for daily driving.

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.

Battery
Stock location, min 10lbs.

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 S
996 Carrera 2 (same as found on US delivered 1999 C2 model)

Deck lids must remain stock.

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.

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 but not recommended if vehicle will be driven on the street.

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.

NOTE: Remember, if you are thinking about eventually moving up to the BSR class, just about everything you do in the BSX class, other than most notably the roll bar extension, can be used in the BSR class so there is very little time and money wasted starting in BSX and moving to BSR at a later time.

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 BSX Rules Committee will consist of a representative of every region wherein there are a significant number of BSX cars. Minimum BSX Rules Committee configuration: 1 builder, 2 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 existing 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 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 BSX 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.

Rules Feedback

To submit input on rule changes or clarify rules interpretation log on to BSX Rules Forums.