Registration | Scoring | Awards | Classification | Safety | Instructor Rules | Sound Restrictions


The purpose of these rules is to ensure safe, fair and enjoyable competition for all competitors at NCR autocross events. North Country Region Autocross rules are based on the PCA Parade Competition Rules (PCR) for autocross with local supplements as defined herein. Note, however, that the NCR classes are different than the PCR defined classes.

NCR is working to align our rules for allowed modifications with the Porsche Competition Rules.  Any modifications allowed in the PCR are allowed in the NCR rules but NCR rules currently allow a few modifications not allowed by the PCR.  See:  2017 PCA Parade Competition Rules



I.A. Eligible Entrants

PCA members in good standing, of any class of membership set forth in the by-laws, and non-members by invitation of the NCR Autocross Chair, may register and compete in NCR Autocross events.  NCR members who wish to invite a guest should contact the autocross chair.  Non-members driving a Porsche and Renegade Miata Club members are automatically invited subject to all other requirements. Other non-members may register on a space available basis.

Competitors must be at least 18 years of age and have a valid driver's license. 16/17 year old drivers who are children of active PCA members may register with permission of the autocross chair. 16/17 year old drivers must hold a valid, unrestricted driver's license and otherwise comply with the requirements of the Junior Participation Program. Contact the autocross chair for more information.

I.B. Registration Requirements

Online registration is required prior to the event. Every registrant is required to check in with registration at the event. Every registrant must present a valid driver's license and sign the insurance waiver. PCA members must present their PCA membership card or pay the non-member rate. All automobiles must successfully pass a tech/safety inspection. See the Safety section below.

I.C. Entry Fees

Entry fees are published on the NCR Autocross Registration Page.

I.D. Late Registration

Official registration will close as announced for each event. Late registration will be allowed only at the discretion of the Registrar and will be assessed a late registration fee.



Competitors will complete a number of timed runs over a fixed course. The official time for each run will be as measured by the automatic timer plus any penalties incurred. A two-second penalty will be imposed for knocking a pylon over or out of its outlined box. If the pylon is left standing and touching any part of its outlined box, it is not a penalty. Pointer or "lay down" cones are considered directional aids and do not impose a penalty.

An event will normally consist of two sessions (morning and afternoon) with 3-4 runs in each session. The course may be the same or different for each session. A competitor's official score for the event will be the sum of the competitor's lowest official time from each session. If due to weather or unavoidable circumstances all run groups do not complete the same number of runs, only the number of runs completed by all run groups will be official runs. Any other runs will be disregarded. If there are less than two official runs in either session, the competitor's official score will be their single lowest official time in the other session.

Competitors will compete in classes set forth in these rules. The competitor with the lowest official score in their respective class will be declared the winner. In the event of a tie within a class, the tie will be broken by considering the second fastest run of each tied competitor for each session, and so on until the tie is broken.



Class awards per event shall be presented in accordance with the following schedule:

Number of EntrantsTrophies Awarded
1-2 1
3-4 2
5-6 3
7-9 4
10 or more 5

Awards will be presented at the conclusion of each event. Additional awards may also be presented at the discretion of the event chair.



The NCR classes are defined to provide fair competition for all entrants. If a model is not listed, then it will be placed in a Race class unless the event chair formally places the automobile in an appropriate class. It is the responsibility of each competitor to classify his or her own automobile. Conflicts over classification will be resolved via a Classification Committee appointed by the Event Chair. Their decision will be final, and may result in disqualification or moving an automobile to a more appropriate class.

IV.A. Categories

Classes are divided into five categories:

Strict Stock Stock Porsche automobiles that are basically as they came from the factory.
Production Stock Porsche automobiles with limited performance-affecting changes.
Race Porsche automobiles with more substantial performance-affecting changes or race tires.
Non-Porsche All non-Porsche automobiles.

The term "stock" as used herein refers to automobiles, components or configurations that were readily available from Porsche as standard or optional equipment on automobiles intended for street use as normally delivered and specified for use in the United States and Canada. Note that this does not include European-spec or other region automobiles.

IV.B. Class Charts

NCR classification is different than the PCR or neighboring region classes. The NCR autocross classes combine Porsche automobiles with similar performance potential across model lines. Porsche automobiles are divided into base classes (also called PAX classes or subclasses) according to the charts shown below. These base classes are combined into larger classes using a handicap system called PAX. These base classes are sometimes called modifiers or PAX classes on the registration site. Non-Porsche automobiles are classified according to SCCA Solo rules. The event chair may at his or her discretion reclassify an automobile to maintain competitive classes.

IV.B.1. Porsche Street Tire Base Classes

Models in ClassStrict StockProduction
924S, 924 Turbo
944 (8v), non-Turbo
Panamera (all)
S1 P1
911 (1965-94 exc Turbo)
914 (all)
928 (all)
944S, S2, Turbo (951)
S2 P2
Boxster, Boxster S (986:1997-04)
Boxster (987.1:2005-08)
Cayman (987.1:2007-08)
Macan (all)
Cayenne (all)
911 (993:1995-98)
S3 P3
Boxster (987.2:2009-12)
Boxster S, RS (987.1:2005-08)
Cayman (987.2:2009-12)
Cayman S (987.1:2005-08)
S4 P4
911 (996:1999-04)
Boxster (981:2013-16)
Cayman (981:2013-16)
718 Boxster (2017-)
718 Cayman (2017-)
Boxster S (987.2:2009-12)
Cayman S (987.2:2009-12)
S5 P5
Boxster S, GTS (981.1:2013-16)
Boxster Spyder (987.2:2011-13)
Cayman R (987.2:2012)
Cayman S, GTS (981.1:2013-16)
718 Boxster S (2017-)
718 Cayman S (2017-)
S6 P6
911 (997.1:2005-08)
911 (997.2/991.1: 2009-15)
911 S (997: 2005-11)
911 GT3 (996:1999-05)
911 Turbo (930:1974-89)
911 Turbo (964:1989-94)
Boxster Spyder (981:2015)
Cayman GT4
S7 P7
911 GTS, Speedster (997.2:2011)
911 S, GTS (991.1:2012- )
911 GT3 (2006- )
911 R
911 Turbo (996:1999-05)
911 997 Turbo
911 991 Turbo
911 Turbo(1995-97)
911 Turbo S (964:1992-94)
911 GT3 RS
911 Turbo AWD
911 GT2
Carrera GT (980:2004-On)
S8 P8

IV.B.2. Progressed Porsche Base Classes

Porsches that do not qualify for the Strict Stock or Production categories will compete in a Porsche Race class.  Porsche automobiles in the Race class(es) are classified according to SCCA rules.

IV.B.3. Non-Porsche Classes

Non-Porsche automobiles are classified according to SCCA rules into base classes.

IV.B.4. NCR Combined Classes

To keep a practical limit on the number of classes and foster competition, NCR groups base classes into larger classes according to the table below. To keep the competition fair within these combined classes, NCR uses a commonly used handicap system called the PAX index. For more information see NCR PAX Information. Each class is assigned a PAX factor based on this index. These factors facilitate comparing times of cars which are not in the same base class.

NCR Combined Classes
Porsche Novice
Porsche S1-S4
Porsche S5
Porsche S6
Porsche S7-S8
Porsche P1-P3
Porsche P4-P8
Porsche Race
non-Porsche Novice
non-Porsche Street
non-Porsche Touring
non-Porsche Race

IV.B.5. Novice Class Rules

The Novice class is open to any eligible competitor driving a Porsche who has been autocrossing for less than one year and to all JPP competitors. Anyone who has previously won an NCR Novice class (or any NCR class) is no longer eligible.

IV.C. Authorized Modifications

IV.C.1. Strict Stock Modifications:

The Strict Stock Category is based on the PCR Showroom Stock Category with more lenient allowances and extended to Porsche street models of any age. Except for modifications allowed in this section, automobiles must be run as specified by the factory.

  1. Any modification authorized in the PCR Showroom Stock Category.
  2. Any DOT approved tire with a minimum tread wear rating of 180 may be used. R-compound tires are not allowed. This restriction applies to OE supplied tires as well. The wheel/tire combination must fit the stock fender configuration without rubbing.
  3. Any wheel may be used provided it is the same width and diameter as standard, and as installed (including wheel spacers if applicable) does not have an offset more than +/- 0.25 inch from a standard OE wheel for the automobile. Wheel spacers are permitted, provided the resultant combination complies with this offset requirement. Wheel studs, lug nuts, and/or bolt length may be changed.
  4. Suspension components (including springs, torsion bars, sway bars, control arms, etc.) may not be substituted unless specifically authorized.
  5. Seats must be OEM equipment.  Alternate seats (e.g. race seats) are not allowed
  6. The air cleaner may be removed or replaced with another type.
  7. Any shock absorber may be substituted provided it has no more than a single external adjustment control. This does not permit addition of coil-over springs.
  8. Brake linings (pads and shoes) and brake lines may be substituted.
  9. Rear Camber Compensation (356 Only): Any rear camber compensating device may be used.
  10. Fire extinguishers, suitably mounted, are permitted.
  11. Roll bars are permitted. Full interior roll cages are not permitted.
  12. Harness bars and non-factory harnesses may remain in the automobile but only the factory seat belts may be used.
  13. Items which are typically removed for an autocross as a safety precaution (such as floor mats, spare tire, jack, lug wrench, and tool set) may be removed.
  14. Adjustments are permitted provided no modifications and/or alterations are necessary to achieve the desired adjustment.
  15. No aftermarket equipment that might be reasonably perceived as performance affecting is permitted in these classes. This restriction also applies to dealer installed options.

IV.C.2. Production Stock Modifications:

  1. Any modification authorized for the Strict Stock Category.
  2. Any modification authorized in the PCR Production Stock Category.
  3. Any DOT wheel/tire combination fitting stock fender configuration. The tires must comply with IV.C.1.c.  OEM tires that do not comply with IV.C.1.c. are allowed if and only if the automobile is otherwise eligible for the Strict Stock category.
  4. Race seats are permitted.
  5. Modified Ignition: Any modification is permitted, provided an original type distributor is used.
  6. Any DME EPROM chip may be used except for those chips programmed to alter turbo boost. No modifications to the intake manifold are allowed.
  7. Modification increasing Turbo boost are not allowed, including waste gate mods, chips and non standard turbochargers etc.
  8. Any oil cooler and/or filter is permitted .
  9. Balanced Engine: Balancing of internal engine parts is permitted.
  10. Camshafts: The stock camshaft must be used.
  11. Exhaust Modifications: Alternate exhaust systems are permitted after the head (subject to applicable noise restrictions). A muffler is required.
  12. Air Conditioning: Removal is permitted.
  13. Overbore: Overbore is allowed up to 1.2mm(0.047.).
  14. Clutch: Any model clutch is allowed. Rubber center clutch discs may be replaced with spring discs. The flywheel may be lightened.
  15. Compression Ratio: Engine compression ratios may be increased up to .5 points from U.S. production specifications.
  16. Suspension Adjustments: Any adjustment or alignment is permitted, provided no machining is required for the adjustment.
  17. Coil Springs/Torsion Bars: Any coil spring may be replaced by any other coil spring. Any torsion bar may be replaced by any other torsion bar.
  18. Shocks Absorbers: Any shock absorber may be used provided it has no more than two external adjustment controls. This does not permit addition of coil-over springs.
  19. Adjustable spring perches are allowed.
  20. Sway Bars: Any anti-sway bar may be installed. Sway bar may not be adjustable from the cockpit.
  21. Bushings: Non-standard (non-elastic) suspension bushings may be used.
  22. Shock Tower Brace: A bolt-in front and/or rear shock tower brace may be used.
  23. A-arms: 924/944/968 series may use aftermarket A-arms provided suspension geometry is not altered.
  24. Brakes: Pads, linings, and brake lines of any manufacture may be used. Any type of brake cooling may be used. Rotors may be drilled or slotted. Brake bias valve may be changed.
  25. Spoilers: Any rear spoiler or front air dam is permitted.
  26. Transmission. Any shifter and shift linkage are permitted. This permits the use of a short shift kit in any automobile or the use of a sideshifter in any 914. No change in gear ratios is permitted. Any limited-slip differential is allowed.

IV.C.3. Race Modifications:

Modifications in the Race Category are as allowed per SCCA rules="" rel="nofollow">SCCA rules.

  1. Engine: A Porsche based engine is required.
  2. Transmission: A Porsche based transmission is required.
  3. Bodywork: Automobile bodywork must maintain recognizable external features of the Porsche model. Automobile bodywork must include a front and rear trunk or deck lid and doors.

IV.C.5. Other Modifications:

Any equipment, component, part, or modification which is deemed performance-affecting and which is not specified will make the automobile entered subject to reclassification to a higher class or category.



All automobiles must pass a safety inspection ("tech") at the event prior to any runs. The NCR safety inspection is basic in nature and is not intended to be a substitute for a proper technical inspection. The track-worthiness of the automobile is the responsibility of the driver. The following is a minimum list of automobile safety requirements:

  1. Helmet - Each participant must wear an approved helmet in good condition. Acceptable approvals are the latest (2015) or two most recent (2010; 2005) SA or M Snell Memorial Foundation approval.  Note that requirements for PCA Driver Education events are more strict.  Any helmets approved for PCA Club Racing are also acceptable.
  2. Bare feet, sandals and open-toed shoes are not permitted while driving.
  3. Minor children and pets must be supervised and are not allowed in the Grid area or near the course at any time (except JPP competitors).
  4. Roller skates, roller blades, heelies or anything similar are not allowed anywhere on the autocross site.
  5. Roll bars.
    1. Roll bars are recommended in all automobiles.
    2. Roll bars are required in all swing axle automobiles (e.g. 356).
    3. Roll bars are required in open automobiles when using R compound tires.
    4. Roll bar requirements in the Race category are as defined by SCCA rules.
  6. Seat belts - Three-point seat belts are required in all automobiles. Properly installed shoulder harnesses are permitted except in the Strict Stock category. Shoulder harnesses may be used in an open automobile only if the automobile is equipped with a roll bar or cage.
  7. Steering and Suspension - Must not have excessive looseness.
  8. Brakes . Must have a firm pedal with no fade while the automobile is stationary. Brake pads should have adequate thickness.
  9. Tires - Must be free of visible sidewall breaks or cords showing. Recapped tires are not allowed.
  10. Wheels - Must be free of cracks. The correct number of lugs and nuts must be present. All lug nuts/wheel bolts must have a minimum thread engagement equal to one bolt diameter. All lug nuts must be torqued to the wheel manufacturer’s specifications.
  11. Snap-on Wheel Covers and Trim - Must be removed from steel wheels for the driving event.
  12. No Fluid Leakage. Gas caps, oil caps and other fluid caps must be securely fastened.
  13. Batteries must be securely fastened.
  14. Hood and Deck Lids - Must fasten securely.
  15. Exhaust System - Must be in a safe condition (i.e., no leaks, securely mounted, etc.).
  16. Sunroofs/Convertible Tops. Sunroofs may be fully open or fully closed. Open automobiles may run with their top down. Removable roof panels must be removed or fully secured. Tilt-up style panels/sunroofs must be removed or fully closed.
  17. Automobiles with a high center of gravity including SUVs, minivans, and pickups are excluded from the Non-Porsche Class.
  18. Windows. The driver and passenger window must be fully down.
  19. Nitrogen bearing fuels are strictly prohibited in all classes.

Any automobile that is judged by the Event Safety Chair to be in an unsafe operating condition at any time during the event shall be barred from further competition until the deficiency is corrected to the satisfaction of the Event Safety Chair.



The use of instructors is encouraged at NCR events. Two types of instructors are approved: official instructors and informal instructors.

An official instructor is an experienced driver whose work assignment for the event is to instruct. Experienced drivers who wish to be considered as official instructors for an NCR event should contact the event chair prior to the event.

An informal instructor is an experienced competitor approved by the chief instructor who may instruct another competitor on an informal basis. The goal of allowing informal instructors is to offer competitors more time with experienced instructors and therefore quicken the learning process. Informal instructors must still work a regular work assignment and can therefore only instruct while they are not working. Informal instructors or students who are in the same heat must be ready to run when their own automobile is called to staging or forfeit their run.

In all cases the student may be either the driver or the passenger. All informal instructors and students must be registered entrants and have signed the insurance waiver.

With the permission of the Event Chair, an instructor may drive the student's automobile for educational purposes. The run will not count towards points or trophies but will count toward the run total for the student (or for the instructor).



Certain autocross sites impose sound restrictions. These are the current restrictions:

SiteSound Limit
*Devens 90dB measured at 75 feet
NHMS 94dB measured at 50 feet

*The Devens sound restrictions are more complicated than above and include sound measurments taken at property boundaries. If you think your vehicle might be too loud, it probably is.

The sound level may be measured from any side of the automobile at any time and includes such noise sources as intake, turbos and tire squeal. Competitors are strongly encouraged to do their best to be significantly below this limit.

The violation policy is as follows:

  1. The automobile may be red flagged and no re-run will be given.
  2. An automatic DNF shall be assigned to the run so the time will not count.
  3. After the first violation, the competitor(s) will be required to demonstrate that an effort has been made to reduce the sound level before the automobile is allowed to take any more runs. This determination will be made by the event chair or a designee.
  4. If the automobile violates the sound limit a second time, that automobile will not be allowed to take any more runs and the competitor will be required to demonstrate that improvements have been made before being allowed to participate at further events.

This policy is a site restriction for all clubs. In order to maintain continued use of the site, the sound restriction is strictly enforced with no exceptions allowed.

[updated July 28, 2017]