P1 at Road America

2021-03-01 P1 DP02 Sealed 2ltr Engine Option

#30038 from Club Racing Board · Rule change · TB 21-01 (2021-01 Fastrack)

In P1 Engine Table, Elan DP02-spec Mazda MZR, change Notes as follows:
"Sealed engine option will be removed effective 1 3/1/2021.

2021-03-01 P1 E&O restrictor terminology

#30285 from Formula/Sports Racing Committee · Rule change · TB 21-03 (2021-03 Fastrack)

In P1 Engine Table, Spec Line C, change the notes as follows:
"May run without inlet intake restrictor at 1150 lbs. min. weight. Up to 1355cc may run without inlet intake restrictor at 1075 lbs.
min. weight."
In P1 Engine Table, Spec Line G, change the notes as follows:
"Up to 2000cc may run with inlet intake restrictor at 1400 lbs. min. weight. Up to 2300cc may run with inlet intake restrictor at
1445 lbs. min. weight."

2021-04-01 P1 Clean up Spec Line A notes section

#30424 from Formula/Sports Racing Committee · Rule change · TB 21-04 (2021-04 Fastrack)

In P1 Engine Table, Spec Line A, change the notes as follows:
"Balance tubes not allowed. One Carb per cylinder. Carburetor induction only. One carburetor per cylinder. Restricted venturi
size. Balance tubes not allowed."

2021-04-01 P1 Clean up Spec Line H notes section

#30425 from Formula/Sports Racing Committee · Rule change · TB 21-04 (2021-04 Fastrack)

In P1 Engine Table, Spec Line H, change the notes as follows:
"Peripheral P port or Bridge Port bridgeport A allowed."

2021-05-01 P1 E&O tonneau cover provision in cockpit opening section

#30458 from Formula/Sports Racing Committee · Rule change · TB 21-05 (2021-05 Fastrack)

In P1, GCR section 9.1.8.C.C.6.c, make changes as follows:
"Allowed equipment would include batteries, ballast, fire bottles, data recording devices, and cool suit
equipment, providing provided such equipment is securely attached to the car. Tonneau covers are allowed in order to meet
minimum dimensions."

2021-05-01 P1 Update Spec Line B Notes

#30498 from Formula/Sports Racing Committee · Rule change · TB 21-05 (2021-05 Fastrack)

In P1 Engine Table, Spec Line B, change the notes as follows:
"Staudacher cars homologated before 1-1-2014 using 1005cc may run 38.5mm flat plate intake restrictor at 950 lbs.
min. weight wt."

2021-05-01 P1 Update Spec Lines C and G notes

#30499 from Formula/Sports Racing Committee · Rule change · TB 21-05 (2021-05 Fastrack)

In P1 Engine Table, Spec Line C, change the notes as follows:
"May run without intake restrictor FPIR not required at 1150 lbs. min. weight wt. Up to 1355cc max. may run without intake
restrictor FPIR at 1075 lbs. min. weight wt."
In P1 Engine table, Spec Line G, change the notes as follows:
"Up to 2000cc max. may run with intake restrictor 30mm SIR at 1400 lbs. min. weight wt. Up to 2300cc max. may run with intake
restrictor 30mm SIR at 1445 lbs. min. weight wt."

2021-05-01 P1 E&O Maximum Valves Per Cylinder

#30559 from Formula/Sports Racing Committee · Rule change · TB 21-05 (2021-05 Fastrack)

In P1 Engine Table, Spec Line B, change the maximum valves per cylinder section as follows:
"NA 4"
In P1 Engine Table, Spec Line C, change the maximum valves per cylinder section as follows:
"NA 4"
In P1 Engine Table, Spec Line D, change the maximum valves per cylinder section as follows:
"NA 4"

2021-08-01 P1 Add 1355cc spec line

#30890 from Formula/Sports Racing Committee · Rule change · TB 21-08 (2021-08 Fastrack)

In P1 engine table, change as follows:
P1 Engine Table
Spec
Line Engine Series

A specification table follows in the original; it is not shown here.

2021-09-01 P1 Move 2000cc and 2300cc engine options to individual spec lines

#31012 from Formula/Sports Racing Committee · Rule change · TB 21-09 (2021-09 Fastrack)

In P1 Engine Table, change as follows:

A specification table follows in the original; it is not shown here.

2021-09-01 P1 E&O Spec Line B notes

#31095 from Formula/Sports Racing Committee · Rule change · TB 21-09 (2021-09 Fastrack)

In P1 Engine Table, Spec Line B, change the notes as follows:
"Staudacher cars may run 950 lbs. min. wt. with 38.5mm flat plate intake restrictor at 950 lbs. min. wt."

2022-01-01 P1 Displacement & Weight Change Request for 2-Cycle 6 Cylinder

#31609 from Jason Miller · Rule change · TB 22-01 (2022-01 Fastrack)

In P1 Engine Table, Spec Line A, change as follows:
P1 Engine Table
Spec
Line Engine Series Max. Displ

A specification table follows in the original; it is not shown here.

2022-05-01 P1 E&O Clarification of Bodywork Rules

#32468 from Club Racing Board · Rule change · TB 22-05 (2022-04 Fastrack)

In P1, GCR section 9.1.8.B.C.2, add the following:
"Cycle-type fenders (which that cover only the tire and are not continuous with the rest of the body) and may thereby permit a
view of the ground from above are prohibited."
In P1, GCR section 9.1.8.B.C.3, add the following:
"As viewed from the side, T the outermost surface of body between the front and rear wheel openings and above the floor must
have a minimum height equal to the height of the front axle centerline."
In P1, GCR section 9.1.8.B.D.1, add the following:
"It is not permitted to duct air through any part of the bodywork for the purpose of providing aerodynamic downforce on the

2022-08-01 P1 Clarify authorization to use flat plate intake restrictor

#32964 from Club Racing Board · Rule change · TB 22-08 (2022-08 Fastrack)

In P1, GCR section 9.1.8.B.J.7, add the following:
"On 4-cycle motorcycle-based engines equipped with individual throttle bodies, individual flat plate intake restrictors must be
installed within 4 inches of the primary butterfly throttle shaft or centerline on the intake side of the individual throttle body's
primary butterfly."

2022-10-01 P1 E&O clarification regarding forced induction

#33123 from Club Racing Board · Rule change · TB 22-10 (2022-10 Fastrack)

In P1, GCR section 9.1.8.B.J, add a new part and renumber the section accordingly:
"1. Turbocharging and supercharging are not allowed."

2022-11-01 P1 Clarify body panel coverage of suspension components

#33318 from Club Racing Board · Rule change · TB 22-11 (2022-11 Fastrack)

In P1, GCR section 9.1.8.B.D.1, add the following:
"No aerodynamic devices (e.g. "skirts," body sides) may extend more than 1cm (0.394 inches) below a lower surface anywhere
on the car to the rear of the front axle. Seat bucket or other protrusions shall not circumvent this rule. Aerodynamic devices shall
be securely mounted on the entirely sprung part of the car and not be movable when the car is in motion. It is not permitted to
duct air through any part of the bodywork for the purpose of providing aerodynamic downforce on the car. This prohibition
includes openings above the front spoiler or splitter that allow air to pass through the front bodywork for the purpose of
providing aerodynamic downforce. Body panels intended to cover suspension components as viewed from the side and above
must not be shaped as an airfoil cross-section or create a pressure differential from the action of air flowing over the upper and

2023-03-01 P1 November 2022 Rules Clarification for Suspension Covers

#33615 from Michael Devins · Rule change · TB 23-01 (2023-01 Fastrack)

In P1, GCR section 9.1.8.B.D.1, effective 3/1/23, change as follows:
"Body panels intended to cover suspension components as viewed from the side and above must not be shaped as an airfoil
cross-section or create a pressure differential from the action of air flowing over the upper and lower surfaces of the
panel. Upper and lower panel surfaces must be symmetrical (mirror images) across a straight line connecting the center of the
leading edge with the center of the trailing edge. Leading and trailing edges may be rounded. Panel angle front to rear and side
to side is unrestricted, but it is not permitted to angle the body panels for the purpose of providing aerodynamic downforce on
the car."

2023-04-01 P1 E&O - Correct dimensional equivalents

#34018 from Club Racing Board · Rule change · TB 23-04 (2023-04 Fastrack)

In P1, GCR section 9.1.8.B.C.3, change as follows:
"Height: No part of the vehicle having special or significant aerodynamic function shall exceed a height of 115cm (45.275 inches)
above the ground with car in normal racing trim, driver aboard."
In P1, GCR section 9.1.8.B.C.4, change as follows:
"However, no portion shall extend more than 10cm (3.937 inches) beyond a plane tangent to the outer face of the front and rear
wheels with tires."
In P1, GCR section 9.1.8.B.C.6.b, change as follows:
"Cockpit length: 60cm (23.662 622 inches). Cockpit width for each seat: 45cm (17.717 inches) maintained over 30cm (11.811

2023-07-01 P1 SIR Testing

#34354 from Jeff Shafer · Rule change · TB 23-06 (2023-05 Fastrack)

In P1, GCR section 9.1.8.B.J, add a new section and re-letter the following sections accordingly:
"3. The SIR testing procedure in Appendix F. Technical Glossary (Restrictor, Intake) is modified as follows: If the vehicle stalls
within 3 seconds, the vehicle is deemed compliant with the stall test."

2023-07-01 P1 E&O Single Inlet Restrictor abbreviation, etc.

#34369 from Club Racing Board · Rule change · TB 23-06 (2023-05 Fastrack)

In P1, GCR section 9.1.8.B.J.2, change as follows:
"Where a carburetor or fuel injection restriction is specified, a flat plate intake restrictor, restricted venturi, or Single Inlet
Restrictor (SIR) is required through which, all intake air for each cylinder or the entire fuel-air mixture, if prepared before this
point, shall must pass through the restrictor."

2023-07-01 P1 E&O Clean up ducted air provision

#34410 from Club Racing Board · Rule change · TB 23-06 (2023-05 Fastrack)

In P1, GCR section 9.1.8.B.D.2, change as follows:
"All ducted air that exits through the top of the bodywork behind the rear of the front tires must pass through a heat
exchanger., excluding This requirement does not apply to the cockpit opening, fender louvers, or slots, louvers, grills, and similar
devices for allowing intended to allow heat to escape the engine bay, shall pass through a heat exchanger."

2024-01-01 P1 Please correct omitted punctuation

#34890 from Club Racing Board · Rule change · TB 23-10 (2023-09 Fastrack)

In Cars and Equipment, GCR section 9.3.33.B.2, add the following:
"(Effective 1/1/2024) A red taillight meeting FIA Standard 8874-2019, Technical List No. 76, is required on all Formula (open
wheel) and Sports Racing cars."
In Appendix F. Technical Glossary, Minimum Weight, change as follows:
"Minimum Weight: – Weight specified with driver, exactly as they come off the race circuit, at the conclusion of any race or
qualifying session."
In FA Table 1, Spec Line E notes, add the following:
"Any BD series iron or alloy cylinder block and alternate crankshaft permitted."

2024-01-01 P1 Adjust restrictors and weights for Engine Table lines H and I

#35229 from Club Racing Board · Rule change · TB 24-01 (2024-01 Fastrack)

In P1 Engine Table, change as follows:
P1 Engine Table
Spec
Line Engine Series Max. Displ.
(cc)
Max
Valves /
Cyl.

2024-01-01 P1 Revise Group CN Honda K20A-FD2 Spec Line

#35337 from Formula/Sports Racing Committee · Rule change · TB 24-01 (2024-01 Fastrack)

In P1 Engine Table, Spec Line G, change as follows:
P1 Engine Table
Spec
Line Engine Series Max. Displ.
(cc)
Max
Valves /
Cyl.

2024-03-01 P1 Remove redundant effective date language in GCR 9.1.8.B.J.4

#35693 from Club Racing Board · Rule change · TB 24-03 (2024-03 Fastrack)

In P1, GCR section 9.1.8.B.J.4, change as follows:
"(Effective 9/1/2023) The use of an ECU map, a computer program, or any other artificial means to stall an engine at any time
during the SIR testing procedure in Appendix F. Technical Glossary (Restrictor, Intake) is prohibited."

2024-03-01 P1 Correct engine series terminology

#35694 from Club Racing Board · Rule change · TB 24-03 (2024-03 Fastrack)

In P1 Engine Table, Spec Line G, change as follows:
"Group CN-spec Honda K20A-FD2"

A specification table follows in the original; it is not shown here.

2024-05-01 P1 Update GCR section 9.1.8.B.J.7

#35907 from Club Racing Board · Rule change · TB 24-05 (2024-05 Fastrack)

In P1, GCR section 9.1.8.B.J.7, change as follows:
"Engines not specified in the table below are not permitted in P1. SCCA does encourages members who wishing to
race other engines designs or propulsion systems not listed above, including Diesel internal combustion engines, hybrid or
electric drive solutions, below to request consideration on a case–by–case basis via letter to the Club Racing Board at
crbscca.com."