Autocross Rules

2006 Autocross Classes

The Boston Chapter Autocross Series features classes for BMWs and non-BMWs. New for 2006: There have been changes in car classes on the BMW side with new class breaks. Also please note we are returning to 6 non-BMW classes.

We continue to use the tried and proven performance based points system for BMWs. Classes can be split into separate classes for street tires and race tires. You will either run in a class that is all R compounds, or you run in a class that is all street tires. Additional race tire classes can be accommodated with a season commitment of at least 6 cars to support the new class. Contact one of the autocross chairs for more information.

Each car is assigned base points according to model and year. Additional points are added for each modification from stock that increases the car's capability. Cars are then classed by total performance points accumulated.

Non-BMW autocross classes are determined by tire compound (stock or race) and whether your car meets the qualifications for SCCA Stock class or not.

2006 BMW Autocross Classes

Self Classification for BMW Classes

* AR allows r compound tires. All other classes do not. In the event 5 or more drivers commit to a season the committee may choose to initiate an r-compound tire class based upon that request, such as a BR, or DR for example.

Be advised, there will be spot checks on all cars throughout the season, especially podium winners. Any car found to be over in points for their class will be immediately and retroactively bumped up to the next higher class. Once proven to be in compliance future events can be run in their original class.

Inspection and Modifications Form for BMW Classes

2006 Non-BMW Autocross Classes

You may use the following guidelines to determine if your non-BMW car is stock:

• Anything available on the exact model and year of your car as standard or optional equipment, as installed on the factory assembly line.
• Standard OEM identical replacement parts are allowed.
• Accessories, gauges, appearance, comfort, and convenience items that don't help your car's performance. A replacement driver's seat is not stock.
• Added roll bar or roll cage. (Roll bars and cages are not required for autocross.)
• Driver harness is allowed.
• Trailer hitch and/or tow bar mountings are allowed.
• Any wheel of diameter and width identical to a stock or factory optional wheel, offset within +/- 0.25 inch, is considered stock.
• Most street legal tires that will fit the mounted wheels and stock bodywork are considered stock.
• Any strut/shock absorber of the same type and mounting as original. No change to standard spring mountings is allowed. Suspension geometry may not be altered. Gas, hydraulic, and/or adjustable shocks are permitted.
• Any brake pads are considered stock.
• Any front anti-roll bar is considered stock. Change to stock/optional rear anti-roll bar (if present) are not permitted.
• Any replacement air filter element (or removal of air filter element), but no plumbing changes (intake runner changes or cone air filter).
• Engine bored no more than .020 inch. No balancing or porting/polishing of head is allowed.
• Replacement of any part of the exhaust system past the catalytic converter.
• Any oil filter is allowed.

If your car meets these qualifications, you will run in Class G if you're on street tires, or H of you use race tires.

If your car does not meet these standards, you aren't in the stock classes. Don't despair, that's what Class I and L (for street tires) and J (race tires) are for. You are in class J if you run on race tires. You are in class L if you run on street tires and your SCCA class is STS, STX, or ST (the Street Touring classes). Otherwise you are class I if your car isn't stock and you have street tires and your SCCA class is ASP, BSP, CSP, DSP, ESP, FSP, SM, SM2 (the Street Prepared and Street Modified classes).

SCCA Solo II Class and PAX Scoring

In order to determine the PAX factor for each car, we must know your car's SCCA Solo II Class. Solo II is the Sports Car Club of America's designation for autocross events. You will be asked for your car's SCCA Class during online event registration so that the timing system can correct your time and post it on race day. If you don't know your car's SCCA Class, please find it using this SCCA Solo II Class Reference. After you determine your SCCA class, you need to find you PAX index number here.

Modified and Race Class

All cars that compete in Class M will be have their respective SCCA PAX used to find their net times.

Autocross Series Points

This average time is used for BMW classes only. For non-BMW classes, the finish order is determined by the PAX Average. PAX is a multiplier assigned to each class of SCCA Solo II competition. It is intended to level the playing field for all cars. Each non-BMW driver's PAX Average is calculated by multiplying the average of their two fastest times by their PAX Factor.

Did Not Run (dnr)

Did Not Finish (dnf)

If you knock over the cones at the end of the stop box you recieve a dnf, because you went off course. The usual reason for a dnf is a missed cone somwhere during your run.

Did Not Place (dnp)

Each event usually lets you have four chances to complete a run in the morning and four chances in the afternoon. If you are new to autocrossing or to the course, please remember that experienced autocrossers are available to ride with you and help you stay on course.

Disqualified (dq)

Work Assignment Required

Please try to report to your work assignment on time. Missing work assignments is a serious offense. The event coordinators have to find someone else to work, and nobody can run until the course is fully staffed. Drivers who habitually miss work assignments will be barred from future events.

Event Points Calculation

The Club will total each driver’s best FIVE finishes in a class. You do not need to attend five events, you can qualify for a trophy with as few as four, but we will total up your five best events (no shows get number of finishers plus one). Obviously the more number of times you attend events the better your chances for a top trophy.

Qualified Drivers

BMW drivers who wish to qualify for a trophy must complete an IMF before their Tech Inspection.

Tiebreakers

1. Most number of 1st place finishes.
2. Most number of 2nd place finishes.
3. Most number of 3rd place finishes.
4. Head to head competition.
5. Head to head time deltas. (The total of the time difference the two drivers for all events that the two met face to face.)

Fastest Time of the Day

Trophies

The number of trophies awarded is based on the number of qualified drivers at the end of the season. One trophy will be awarded for every 3 qualified drivers, with the number of drivers rounded up. So if there are 10 qualified drivers, four trophies will be awarded.

Trophies will be awarded at the annual dinner, typically in January.

Most Improved Driver

BMW Driver Of The Year Award

The Katherine V. Kvale Trophy is a perpetual award given each year to the BMW Driver of the Year, as determined by the Autocross Committee Chair(s), to recognize the class winner whom they believe achieved the club's highest level of performance, consistency, and sportsmanship for the season.

More 2006 Autocross Series Information

• 2006 Boston Chapter Autocross Series: Introduction, general information, other autocross events and resources.
• Eligibility and Registration: Driver eligibility, event registration, no-show policy, cancellations, and refunds.
• Day Of Event Information: Daily autocross schedule, visitor policy, tech inspections, work policy, and course assignment.
• Directions To Site: Directions to the autocross site.
• Car Classification: Determine your car's autocross class.