Wording removed by a change is shown struck through, as in the original. 45 changes, 66 other letters.
Changes made
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."
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."
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.
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."
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In FC, GCR section 9.1.1.B.11.c, change as follows: "The Mazda MZR LF-DE 2 liter for use only in USF2000 cars, as described in the Spec Line Cars Table below."" In F600, GCR section 9.1.1.D.14, add the following: "Rotax Model 494, Model 493, and Model 593 must use a single expansion chamber and must be equipped with a pull starter; an electric starter may be added." In P1, GCR section 9.1.8.B.J.2, add the following: "Where a flat plate intake restrictor, restricted venturi, or Single Inlet Restrictor (SIR) is required, all intake air for each cylinder or the entire fuel-air mixture, if prepared before this point, must pass through the restrictor."
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.
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Req’d Restrictor Min. Weight (lbs) Notes H 4 cycle 2000 4 30 32mm SIR 1400 1450 I 4 cycle 2300 4 30 31mm SIR 1445 1475
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.
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Req’d Restrictor Min. Weight (lbs) Notes G Group CN-spec Honda K20A-FD2 2000 4 Stock Honda intake manifold with unmodified 64mm single throttle body 1400 No engine modifications except dry sump oil system, ECU map, and exhaust. Must use stock Honda OEM parts as listed in CN Honda K20A- FD2 Parts List found here: https:/www.scca.com/pages/technical-forms-and- downloads. No machining allowed. The CRB reserves the right to add an appropriately sized flat plate intake restrictor at any time if warranted by the data.
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."
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."
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."
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
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inches)."
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."
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
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lower surfaces of the panel."
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."
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."
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
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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."
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.
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.
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."
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.
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."
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."
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."
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"
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."
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."
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.
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."
E&O minimum weights and intake manifolds
#28731 from Formula/Sports Racing Committee · Rule change · TB 20-05 (2019-05 Fastrack)
In P1, delete GCR section 9.1.8.C.J.1 as follows: "Applicable minmum weights are specified in the P1 Engine Table." In P1, GCR section 9.1.8.C.J.3, make changes as follows: "Intake manifolds: individual runner, no plenum or balance pipes permitted are unrestricted on engines that do not require a flat plate intake restrictor unless using an SIR or otherwise noted on the in an engine spec line. Cars using an SIR may use any manifold type. Plenums and/or balance pipes are not permitted on engines that use an individual runner-type manifold and require a flat plate intake restrictor."
Extend date for removing sealed DP02-spec 2.0L option
#28046 from Formula/Sports Racing Committee · Rule change · TB 20-02 (2020-02 Fastrack)
by one year In P1 Engine Table, Line F, make changes as follows:
A specification table follows in the original; it is not shown here.
Remove sealed DP02-spec 2.0 MZR spec
#26753 from Formula/Sports Racing Committee · Rule change · TB 19-07 (2019-07 Fastrack)
line effective 1/1/2020 In the P1 Engine Table, 2.0L Elan DP02-spec Mazda MZR line, change the notes as follows: "Must have four (4) numbered seals in place on cam cover, oil pan, front cover, and crank angle sensor as installed by Elan Power Products or Elite Engines. No engine modifications permitted. Sealed engine option will be removed effective 1/1/2020." Note from the Club Racing Board: The Elan DP02 and its sealed Mazda 2.0 MZR engine became ineligible for the IMSA Prototype Challenge series after the 2018 season. Due to
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the absence of engine build, mapping, and performance criteria for the IMSA 2.0 MZR engine, the CRB is unable to ensure that the specifications that have allowed it to run without a restrictor in P1 remain unchanged. Consistent with the removal of the sealed 2.3 liter option after the 2017 season, the sealed 2.0 liter option will be removed from Spec Line F at the end of the 2019 season. As with the 2.3 liter engine, competitors may continue to run the 2.0 MZR engine in the P1 class subject to the requirements of Spec Line G.
Update Revised Spec Line F
#27745 from Formula/Sports Racing Committee · Rule change · TB 20-01 (2020-01 Fastrack)
In P1 Engine Table, Spec Line F, make changes as follows:
A specification table follows in the original; it is not shown here.
E&O Transmissions
#27098 from Formula/Sports Racing Committee · Rule change · TB 19-08 (2019-08 Fastrack)
In P1, GCR section 9.1.8.C.H, add the verbiage as follows: "Traction control is not allowed."
E&O Transmissions
#27005 from Formula/Sports Racing Committee · Rule change · TB 19-07 (2019-07 Fastrack)
In P1, GCR section 9.1.8.C.H, add the following: "All gear changes shall be initiated by the driver. Mechanical gear shifters, direct-acting electric solenoid shifters, air-shifters and similar devices are permitted. Electronically controlled differentials and devices that allow pre-selected gear changes are prohibited. Power shall not be applied to more than two (2) wheels."
Move minimum height provision to
#27031 from Formula/Sports Racing Committee · Rule change · TB 19-07 (2019-07 Fastrack)
bodywork height section In P1, GCR section 9.1.8.C.C.11, delete in its entirety as follows: "The outermost surface of body between the front and rear wheel openings must have a minimum height equal to the height of the front axle centerline." In P1, GCR section 9.1.8.C.C.3, add new wording as follows: "Height: No part of the vehicle having special or significant aerodynamic function shall exceed a height of 115cm (45.25 in) above the ground with car in normal racing trim, driver aboard. The outermost surface of body between the front and rear wheel openings
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must have a minimum height equal to the height of the front axle centerline."
Remove duplicative fender louver provision
#27033 from Formula/Sports Racing Committee · Rule change · TB 19-07 (2019-07 Fastrack)
In P1 GCR section 9.1.8.C.C.9, make changes as follows: "Louvers or exit ducts for extraction of the air from the top of the fenders are allowed. Brake ducts are allowed. and D ducts allowing air into the engine compartment are allowed permitted." In P1, GCR section 9.1.8.C.C.2, make changes as follows: "The bodywork as viewed from the side and above shall cover all mechanical components including suspension except that the intake, exhaust, tow hooks, jack points, and radiators may be exposed. As viewed from the side, the bodywork shall extend over the full width
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of the tires for at least one-third (1/3) of their circumference. Ventilation slots Louvers for the extraction of air from the tops of the fenders are permitted. The tires shall not be seen as viewed from above except through ventilation slots ( louvers), provided that the fore/aft opening through which the tire may be seen does not exceed 3/16 inches when viewed from above; rear tires may be exposed as viewed from the rear. Cycle-type fenders (which cover only the tire and are not continuous with the rest of the body) are prohibited. Fenders shall be firmly attached to the bodywork."
Missing word E&O
#26919 from Formula/Sports Racing Committee · Rule change · TB 19-06 (2019-06 Fastrack)
In GCR section 9.1.8.C.B.2, change as follows: "Anti-intrusion panels are allowed anywhere on the sides of the chassis."
E&O correction to GCR 9.1.8.C.C.
#26927 from Formula/Sports Racing Committee · Rule change · TB 19-06 (2019-06 Fastrack)
E&O correction to GCR In GCR section 9.1.8.C.C.1, change as follows: "Bodywork shall provide comfort and safety for a driver and a passenger or for a driver only." In GCR section 9.1.8.B.7.b, change as follows: "Bodywork shall provide comfort and safety for a driver and a passenger or for a driver only." In GCR section 9.1.8.D.7, change as follows: "Bodywork shall provide comfort and safety for a driver and a passenger or for a driver only."
Clean up reference to engine table
#26648 from Formula/Sports Racing Committee · Rule change · TB 19-05 (2019-05 Fastrack)
In GCR section 9.1.8.C.J, change as follows: “The table ( P1 Engine Table) that follows provides general specification of engine types, displacement limits, intake restrictions, and automobile weights allowed.”
Remove redundant spec line
#26692 from Formula/Sports Racing Committee · Rule change · TB 19-05 (2019-05 Fastrack)
In P1 Engine Table, remove Mazda Renesis Rotary spec line (Spec Line I).
Clean Up Engine Table Language
#26590 from Formula/Sports Racing Committee · Rule change · TB 19-04 (2019-04 Fastrack)
In P1 Engine Table, Spec Line B, change as follows: “Staudacher cars homologated before 1-1-2014 utilizing using 1005cc may run 38.5mm flat plate intake restrictor at 950 lbs. min. weight.” In P1 Engine Table, Spec Line F, Honda K20A-FD2, change as follows: “No engine modifications except for dry sump oil system, ECU mapping, and exhaust system.”
Move single-seat closed cockpit provision to
#26376 from Formula/Sports Racing Committee · Rule change · TB 19-03 (2019-03 Fastrack)
Chassis section In P1, delete GCR section 9.1.8.C.J.5 in its entirety as follows: “5. Closed cockpit single seat cars are prohibited.” In GCR section 9.1.8.C.B, add a new wording as follows: “4. Closed cockpit single seat cars are prohibited.”
Correct errors in GCR section 9.1.8.C.J
#26144 from Formula/Sports Racing Committee · Rule change · TB 19-02 (2019-02 Fastrack)
In P1, GCR section 9.1.8.C.J, make corrections as follows: “6. Engines not specified in the tables above below are not permitted in P1.” “7. Any ECU utilizing ETC/FBW/DBW ETC throttles, must use dual output pedal position sensors[add space](or other ECU required fail-safes) and be capable of detecting a fault and limiting throttle activation.”
Remove redundant inlet restrictor provisions
#25877 from Formula/Sports Racing Committee · Rule change · TB 19-01 (2019-01 Fastrack)
In GCR section 9.1.8.C.J.2, make changes as follows: “Where a carburetor or fuel injection restriction is specified, a flat plate restrictor, venturi, or SIR or TIR is required through which all intake air for each cylinder or the entire fuel- air mixture, if prepared before this point, shall pass. SIR and TIR installations are per the Technical Glossary requirements. Where intake restrictors (excluding SIR and TIR) are specified, the restrictors shall be round orifices (unless otherwise specified) and located within four (4) inches of the throttle butterfly.” Delete GCR section 9.1.8.C.J.10 in its entirety and re-number as appropriate:
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“On turbocharged and supercharged engines, only one turbocharger or supercharger unit shall be used, and all air shall pass through a single inlet restrictor.”
Clarify Honda K20A-FD2 parts requirement
#25949 from Formula/Sports Racing Committee · Rule change · TB 19-01 (2019-01 Fastrack)
In P1 Engine Table, Group CN-spec Honda K20A-FD2 line, change the notes as follows: “No engine modifications except for dry sump oil system, ECU mapping, and exhaust system. Must use stock Honda OEM parts as listed in CN Honda K20A-FD2 Parts List found here: https://www.scca.com/pages/technical-forms-and-downloads. with n No machining allowed.”
Correct GCR section 9.1.8.C.J errors
#25966 from Formula/Sports Racing Committee · Rule change · TB 19-01 (2019-01 Fastrack)
In GCR section 9.1.8.C.J, make corrections as follows: “Generally applicable information for P1 engines and automobile weights are is given in the following paragraphs. The table (P1 Engine Table) that follows provides general specification of engine types, displacement limits, head designs, intake restrictions, and automobile weights allowed.”
Other letters
Honda k20 Intake for P1
#37089 from Ryan Szyjakowski · Not recommended · Minutes (2024-12 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. The P1 class will be discontinued effective 1/1/25 and no rule changes are planned in P1 before the end of the year, but the P1 rule set will be incorporated with minor changes in the rule set for the new Prototype class and the spec line for the Group CN Honda K20A-FD2 engine will be carried forward. Please note that since 1/1/24, the P1 Group CN spec line has allowed competitors to make unlimited internal modifications to the Honda K20A-FD2 engine while continuing to require the stock intake manifold with the stock 64mm single throttle body, and this specification will be continued in the new Prototype class. The requirement of using the stock intake system as the "restrictor" for the internally modified K20A-FD2 engine is based on information provided to the CRB which indicates that the Single Inlet Restrictor (SIR) typically used on P1 cars with automotive-based engines is incompatible with the
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K20A-FD2's intake layout on Group CN cars. On-track data obtained from a Group CN car using the Honda K20A-FD2 engine in unrestricted form (with unlimited internal modifications and aftermarket individual throttle bodies) established that the car was an overdog compared to other P1 platforms, and accordingly restrictions were imposed on the K20A-FD2 engine. The CRB obtained dynamometer data for an internally modified K20A-FD2 engine using various types of intake restrictions, including the restriction provided by using the stock Honda intake manifold with the stock 64mm single throttle body. The dynamometer data indicates that an internally modified K20A-FD2 engine using the stock 64mm single throttle body intake system produces horsepower comparable to a 2500cc engine with a 30mm SIR. While various factors limited opportunities to set a representative qualifying time during the official Runoffs qualifying sessions, the CRB has access to lap times recorded during the unofficial test days, and these records show that the qualifying lap time attributed to the Group CN car as evidence of the need for a competition adjustment is not indicative of the car's true potential. In addition, a Group CN car using the Honda K20A-FD2 engine in the form permitted by the P1 spec line (with unlimited internal modifications and the stock 64mm single throttle body intake system) has demonstrated lap-time performance similar to that of an Elan DP02 using a 2500cc engine with the same driver in West Coast SCCA events. Also, weight data obtained from that car shows that it is reasonably close to the Honda K20A- FD2 spec line's minimum weight. The CRB will monitor performance in the new Prototype class and will make adjustments as necessary based upon AiM data collected during on-track sessions.
Request Radical SR8 be moved out of GTX to P1
#36883 from Jack Baruth · Not recommended · Minutes (2024-12 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. The Radical SR8 has a turbocharged engine, which is not permitted in P1 and will not be permitted in the new Prototype (P) class. In addition, the SR8 is 300 pounds heavier than the heaviest car in P1 and nearly 800 pounds heavier than the lightest car in the class. This is undesirable from a safety standpoint. Also, the referenced height differences between cars in the GTX class's run group are not uncommon in other race groups in the SCCA, and drivers are accustomed to adjusting to this by being more observant when running together.
Correction to Response to #35716
#36014 from Gregory Case · No action required · Minutes (2024-05 Fastrack)
Thank you for your letter. The Club Racing Board appreciates your input.
Rain Light Addition/Clarification
#35869 from Gregory Case · No action required · Minutes (2024-05 Fastrack)
Thank you for your letter. Rain lights in Technical List No. 19 meet the previous 2008 FIA specification, while rain lights in Technical List No. 76 meet the current 2019 FIA specification. A significant difference exists between the two specifications. Rain lights that meet the 2019 FIA specification are more than three times brighter than rain lights that meet the 2008 FIA specification. When researching the subject, the FSRAC and the CRB reviewed video footage of formula and sports racing cars in SCCA rain races, and the visibility of the cars ahead was clearly a function of the level of brightness from individual rain lights. Please see the response to letter #34859 in the November 2023 Fastrack. The FSRAC and the CRB concluded that the current 2019 FIA standard's three-times-brighter specification would have made a significant difference in the visibility of the cars ahead in these rain races, providing a measurable improvement in the safety of the competitors. The CRB's decision to
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follow the current 2019 FIA specification for F/SR rain lights was based on choosing the standard that afforded the level of safety believed to be appropriate for these cars.
Begin Tracking of Non-Ferrous Brakes in P1
#35716 from Perry Richardson · Not recommended · Minutes (2024-04 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. P1 is a development class in which a majority of respondents to a 2023 survey favored retaining non-ferrous/carbon-carbon brake systems, and penalizing development within the rules would be contrary to the class philosophy. Although Balance of Performance (BoP) adjustments are used to permit different platforms to race together in the same class, the criterion for a BoP adjustment is limited to the analysis of a car's acceleration rate in a speed range before aerodynamic drag has a significant effect — typically between 60 and 100 mph. BoP adjustments are not used to equalize lap-time performance or ensure overall competitiveness, and the CRB does not adjust power or minimum weight based on the use of different brake systems, aerodynamic configurations, or chassis setups. BoP adjustments based on the type of brake system used would be particularly infeasable, given that driver technique during braking
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is highly variable, unlike driver technique under full-throttle acceleration.
Rain Light Addition/Clarification
#35659 from Greg Case · Taken care of · Minutes (2024-03 Fastrack)
Thank you for your letter. Please see the responses to letters #34719 and #34847 in the November 2023 Fastrack.
Allow a larger overbore for automotive 1615cc engines in P1 & P2
#35218 from Seth Allen · Not recommended · Minutes (2024-01 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend these changes. A P1 car using the 1615 cc Toyota 4A-GE engine with 40 mm chokes was on pole position, set the fastest race lap, and won the National Championship race at the 2020 Runoffs, and the AiM data collected at the 2022 June Sprints shows the acceleration rate of the 1615 cc 4A-GE platform is in line with the acceleration rates of the other P1 engine options, so no basis is seen for increasing the 4A-GE's displacement to the requested 1654 cc. With respect to the Toyota 4A-GE's classification in the P2 class, the CRB needs to have on-track data to be able to make accurate comparisons. If a competitor believes the acceleration rate of the Toyota WSR car using the 1615 cc engine with a 41.5 mm restrictor is out of line with the P2 class BoP standard, it is incumbent upon the competitor to contact the CRB in advance of entering and competing in a U.S. Majors Tour or Hoosier Super Tour event to allow the CRB an opportunity to
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gather the relevant data and make appropriate adjustments if warranted.
CN Engine Change
#34871 from Jonothan Benefield · Taken care of · Minutes (2024-01 Fastrack)
Thank you for your letter. Please see the response to letter #35337 in this Fastrack's Technical Bulletin.
CN Chassis Engine Change
#34799 from Jim Devenport · Not recommended · Minutes (2024-01 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend these changes as requested, but please see the response to letter #35337 in this Fastrack's Technical Bulletin.
Consider Ligier LMP 3 and 4 in P1 Class
#35000 from Bob Monette · Not recommended · Minutes (2023-12 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. LMP cars were originally classified in the Prototype X (PX) class, which was intended to provide a place for members to race unmodified prototype cars that had previously run with GT-type cars in professional racing series such as IMSA, Grand-Am, etc. It was understood from the beginning that PX cars such as LMPs would be grouped with big-bore GT, Sedan, and Touring cars (GT1/GT2/AS/T1), because the cars had too much mass and too much straight-line speed to be safely grouped with F/SR classes such as P1, P2, FA, FC, FE2, and FX. Ultimately, because both PX and GTX were non-points, non-championship classes in which a Balance of Performance (BoP) formula was not used, there was no need for two non-points, non-championship, non-BoP classes in the same run group. Reclassification of the PX cars into the GTX class did not change the LMP cars' original run group. In addition, GTX cars such as
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the LMP do not fit within the class philosophy and specifications of the P1 class, which runs under a BoP formula to promote closely-matched performance between cars, unlike the GTX class. The P1 rules accordingly prohibit V-8 and V-6 engines like those used by LMP cars, which would be well outside the BoP standard for P1. Further, LMP cars such as the Ligier are 800-1200 pounds heavier than P1 cars and other F/SR cars with which they would be grouped on track, meaning that some cars would be less than half the Ligier's weight. This is undesirable from a safety standpoint. The referenced height differences of 5.0 to 7.5 inches between cars in the GTX class's run group are not uncommon in other race groupings in the SCCA, and drivers are accustomed to adjusting to this by being more observant when running together.
Prohibit artificial means of stalling engine during SIR test
#34680 from Club Racing Board · Recommended to the Board · Minutes (2023-09 Fastrack)
In P1, GCR section 9.1.8.B.J, add a new section and renumber the following sections accordingly: "(Effective 9/1/2023) 4. 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."
Rotary Performance Adjustment Request
#33565 from Jim Downing · Not recommended · Minutes (2023-01 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. The Mazda 13B has not regularly competed in recent U.S. Majors Tour events, and the Club Racing Board does not have current on-track data for the platform. The on-track data collected at the VIR Super Tour event in 2019 showed a Mazda 13B using the current restrictor size to be fully in line with its competitors for the factors that enter into a Balance of Performance powertrain assessment. Please see the response to letter #27736 in the December 2019 Fastrack Minutes. If a member who is interested in racing the 13B enters and competes in a U.S. Majors Tour event in 2023, the Club Racing Board will arrange to obtain on-track data to assess the platform’s current performance potential relative to other cars in the class and will make data-based adjustments if warranted.
Wolf or Norma with 1.6T allowed in P1?
#33097 from Steve Marton · No action required · Minutes (2022-10 Fastrack)
Thank you for your letter. The P1 rules state that "Engines not specified in the table below are not permitted in P1." No spec line in the referenced engine table permits a turbocharged engine by engine series or requires a Turbo Inlet Restrictor (TIR). Please see GCR section 9.1.8.B.J.4 and the P1 Engine Table. Forced induction engines are outside the class philosophy. Please see the responses to letter #28809 in the June 2020 and September 2020 Fastrack Minutes and the response to letter #33123 in this Fastrack's Technical Bulletin.
Request Engine modification
#32622 from Jonothan Benefield · Not recommended · Minutes (2022-06 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend the use of two different methods of intake restriction for the same spec line. SIRs have been successfully implemented on other P1 cars with similar auto-based engines. Please see the response to letter #23792 in the March 2018 Fastrack Minutes.
P1 Class Weight Change Proposal
#32487 from Ralph Firman · Not recommended · Minutes (2022-06 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. The proposed RDRF car's actual weight with a Halo device is presently unknown and when completed could conceivably meet the current minimum weight under whichever spec line the car is intended to run without the requested 30 lb. increase. Also, a need for an across-the-board 30 lb. increase has not been demonstrated because no existing P1 car uses a Halo device and no P1 competitor has expressed a desire to retrofit an existing car with a Halo device, so the requested increase would penalize all other cars in the class with no factual basis for doing so. In addition, the fact that adding a Halo device would result in a higher center of gravity provides no basis for a Balance of Performance adjustment under the P1 class philosophy. BoP adjustments are not used in P1 to compensate for chassis design choices, including ones that might result in a higher center of gravity. Weight is added or subtracted (or restrictor
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size reduced or increased) based solely upon a car's longitudinal acceleration rate in a speed range of approximately 60 to 100 mph, which would not likely be affected by a higher center of gravity.
Prototype SIR Compliance
#32544 from Club Racing Board · Member advisory · Minutes (2022-04 Fastrack)
MA – 22-01 The Club Racing Board has become aware that P1 competitors are attempting to defeat the SIR stall test by programming the ECU to shut down the engine when it senses a drop in RPM to avoid the detection of controlled leaks in the air box. The rules clearly state that the introduction of air behind the SIR by any means is prohibited. The CRB is developing innovative methods for detection and requests that the Stewards of the Meeting (SOM) employ zero tolerance in connection with any SIR infractions or attempts to defeat the SIR stall test.” For additional details, contact the tech department at SCCA.
Request engine modification
#32421 from Jonothan Benefield · Not recommended · Minutes (2022-04 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend these changes. Nothing in the P1 rules prohibits the use of individual throttle bodies (ITBs) on a Honda FD2 engine. Honda FD2 owners have two options: they can use OEM parts with the 64mm single throttle body and no SIR at 1,400 lbs. minimum under Line G, or they can add higher performance pistons, rods, and cams and use ITBs with a 30mm SIR at the same weight under Line H. In addition, nothing in the rules prohibits enlarging a Honda FD2 to 2.3L and using higher performance parts and ITBs with a 30mm SIR at 1,445 lbs. minimum under Line I. A CN Honda FD2 engine is permitted to run without an SIR under Line G because the OEM parts (including the 64mm single throttle body) limit the power such that an SIR is not necessary. Competitors who wish to modify a Honda FD2 in the same way that competitors modify the Mazda MZR are free to do so under a spec line appropriate for the displacement. What the rules do
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not allow is adding ITBs and/or higher performance pistons, rods, and cams to a Honda FD2 without using an SIR. This would be unfair to other competitors whose modified engines are required to use an SIR. Data obtained at the 2019 Runoffs from a Norma M20FC using the stock Honda FD2 under the CN spec line showed that the car’s acceleration rate was fully in line with and at no disadvantage to the Elan DP02-Mazda 2.5L cars from which data was also obtained. Please see the response to letter #27639 in the December 2019 Fastrack. P1 is the most technologically advanced and open class in SCCA's Road Racing program. Competitors may choose the chassis, engine, and tires they wish to race, and the rules allow for improvement of aerodynamics, suspension, brakes, and other systems to make a platform more competitive, so it should not be assumed that manufactured cars like CN cars will be able to run at the front without modification. This additional development results in increased performance in cornering, braking, and top speed, which are not subject to the BoP process and are factors entirely within a competitor's control.
Newest Generation 1L Motorcycle Engine
#32360 from Chip Romer · No action required · Minutes (2022-04 Fastrack)
Thank you for your letter. The Club Racing Board appreciates your comments.
Data monitoring in P1
#32340 from Jeff Shafer · No action required · Minutes (2022-04 Fastrack)
Thank you for your letter. The Club Racing Board appreciates your comments.
Adding the Mazda 12a rotary to P1 eligible motors (again)
#32078 from Guilbert Twiss · Not recommended · Minutes (2022-03 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. The P1 class is intended to be the premier sports racing category promoting advanced technology in design and innovation, and the class philosophy is not to classify cars that could not be competitive in P1. The Mazda 12A is outside the P1 performance envelope, but the engine is approved for use in the P2 class, and the Beasley B2 is also in line with P2 performance expectations. Please see the response to letter #32147 in this Fastrack’s Technical Bulletin.
In Support of Letter #31609
#31721 from Lee Alexander · No action required · Minutes (2022-01 Fastrack)
Thank you for your letter. Please see the response to letter #31609 in this Fastrack's Technical Bulletin.
Heavy Car Still and Always Deserves Larger Restrictor
#31312 from Johnnie Crean · Not recommended · Minutes (2021-12 Fastrack)
Thank you for your letter. Data obtained at the 2021 June Sprints shows that the three Stohr chassis that were equipped with AiM data boxes—the referenced 1615cc car, a 1455cc car, and the 1355cc car that won the 2021 P1 National Championship— had acceleration rates that were very closely matched and were at no disadvantage to the two 2500cc Elan DP02s and the converted FA 1615cc Swift 014a that were fitted with the data boxes. The national championship race at Indianapolis refutes the notion that a Stohr cannot compete with a "high downforce" DP02. An individual car's deficits in braking power, cornering performance, and right/left transitional handling capabilities are not subject to the SCCA's BoP process and are not remedied by increasing the car's restrictor size. If concerns remain about the referenced 1615cc car's weight and restrictor size despite the acceleration rate data, then the engine table provides an alternative: a car using the 1455cc engine has the option to run
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without a restrictor at a minimum weight of 1150 lbs.
More Air for Heavier Stohr
#31305 from Johnnie Crean · Not recommended · Minutes (2021-12 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. Please see the response to letter #31312 in this Fastrack.
Elan DP02 Restrictors
#31205 from Aaron Hill · Taken care of · Minutes (2021-12 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. Please see the response to letter #31168 in the November 2021 Fastrack Minutes.
Elan DP02 Sealed Engine
#31168 from Chris Vian · Not recommended · Minutes (2021-11 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. The sealed engines are no longer viable because they have not been used by IMSA for several years and SCCA cannot ensure that power would remain at the level that previously allowed them to run without an inlet restrictor in P1. While new seals conceivably could be applied after engine rebuilds, the Club Racing Board and Tech officials would have no means of verifying that the proprietary parts that originally allowed the engines to run without an inlet restrictor were used during each rebuild. Moreover, even if it were possible to confirm that the proper parts were used, this would not eliminate the sealed engines' inherent problem. DP02s with sealed engines are outside the P1 performance envelope – when they were legal in P1, the data showed that their trap speeds were 12- 15 mph slower than the trap speeds of other cars in the class. As a result, DP02s with sealed engines were rarely entered when
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they were legal in P1. For all these reasons, the best option for the class is to do what other DP02 owners have done since 2017: upgrade the engine components and install the required 30mm SIR, which balances power with much greater precision than could be achieved by attempting to prescribe allowable parts and modifications for individual engine applications.
Request restrictor change for the Wombat for more power
#31103 from Johnnie Crean · Taken care of · Minutes (2021-10 Fastrack)
Thank you for your letter. Please see the responses to letter #30787 in the August 2021 Fastrack, letter #30484 in the May 2021 Fastrack, letter #29621 in the December 2020 Fastrack, and letter #29232 in the October 2020 Fastrack.
Eliminate carbon rotors & pads or add weight to cars using them
#31016 from Jason Miller · Not recommended · Minutes (2021-09 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. P1 is intended to be the premier sports racing class, promoting advanced technology in car design and innovation while utilizing established cost-effective engine technology. Consistent with this class philosophy, competitors may improve brakes, aerodynamics, suspension design, and other systems to make a platform more competitive. The Club Racing Board uses an SCCA-developed Power Factor formula (PF = Weight/Peak HP + Peak Torque/2) to set weight and power parameters and periodically collects on-track data to confirm that cars have similar acceleration rates from roughly 60 to 100 mph, but, consistent with the class philosophy, braking performance is the competitor's responsibility and is not subject to the Balance of Power (BoP) process.
Request Disp. Change for 2-Cycle 6 Cyl. eng or min. weight change
#31014 from Jason Miller · Not recommended · Minutes (2021-09 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. A review of on-track data obtained during the 2020 National Championship Runoffs, including a request for additional views, does not support a 255cc increase in displacement or a 100-lb. decrease in minimum weight. Please see the response to letter #29901 in the January 2021 Fastrack Minutes.
Please Allow 1180 Pound Stohr More Air to Equalize Acceleration
#30787 from Johnnie Crean · Not recommended · Minutes (2021-08 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. On-track data obtained at the 2021 June Sprints Super Tour event confirms that the referenced Stohr has no deficit in low-speed, medium-speed, or high-speed acceleration rate as compared to the 2.5 liter Elan DP02 platform. Any deficits in the Stohr's lateral acceleration and braking performance, whether the result of chassis setup or driver input, would not be eliminated by increasing the size of the car's intake restrictor. Adjustments or changes to reduce or eliminate cornering and braking deficits are the responsibility of the competitor and are not subject to the SCCA's Balance of Power (BoP) process.
P1 Stohr rules
#30484 from Johnnie Crean · No action required · Minutes (2021-05 Fastrack)
Thank you for your letter. Equalizing lap times is contrary to the P1 class philosophy. P1 cars are not built to a formula, and the variety of chassis and engine combinations does not lend itself to the balance of performance adjustments seen in some professional prototype series. P1 cars are therefore subject to balance of power adjustments. The Club Racing Board uses an SCCA-developed Power Factor formula (PF = Weight/Peak HP + Peak Torque/2) to set weight and power parameters and periodically collects on-track data to confirm that cars have similar acceleration rates from roughly 60 to 100 mph, before aerodynamic forces become significant. Competitors may choose the chassis, engine, and tires they wish to race, and the rules allow for the improvement of aerodynamics, suspension design, brakes, and other systems to make the platform more competitive, so it should be not assumed that a manufactured car will be capable of running at the front without modification.
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Adding performance parts and components may make it more difficult to meet the applicable minimum weight. The burden is on the competitor to weigh the pros and cons and decide whether the benefits of adding such parts and components exceed the penalty of additional weight. Smaller/lighter cars such as the Stohr do not need to develop the same level of downforce or have the same amount of tire on the road as larger/heavier cars such as the DP02 and converted FA cars to be able to compete with those cars.
Elan DP02 Restrictor
#30138 from Aaron Hill · Not recommended · Minutes (2021-04 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. The sealed DP02-spec 2.0L engine is outside the P1 performance envelope. Please see the responses to letters #26753 in the July 2019 Fastrack Technical Bulletin, #27867 in the January 2020 Fastrack Minutes, #29756 in the December 2020 Fastrack Minutes, #30038 in the January 2021 Fastrack Technical Bulletin, and #30032 in this Fastrack. A restrictor is not being added to modified DP02 engines for 2021. Modified engines have been required to use a single inlet restrictor since the class was inaugurated in 2014.
DP02 engine specs
#30032 from Michael Major · Not recommended · Minutes (2021-04 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. Please see the response to letter #30038 in the January 2021 Fastrack Technical Bulletin. Switching to a 2.5L engine is not the only option. Line G's notes include a lower minimum weight for cars using a modified 2.0L engine that allows for the difference in torque compared to larger displacement engines. The 30mm single inlet restrictor (SIR) required on Line G engines balances power with greater precision than could be achieved by prescribing allowable parts and modifications for each engine application. A sealed SIR airbox for the DP02 is commercially available to competitors who do not wish to build their own.
Request to add a spec engine line to P1
#30222 from Carl Wassersleben · Not recommended · Minutes (2021-03 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. The engine platform is not within the P1 performance envelope, but its capabilities are in line with performance expectations in the P2 class. Please see the response to letter #30272 in this Fastrack’s Technical Bulletin.
2.3L sealed engine
#30057 from Chris Vian · Not recommended · Minutes (2021-02 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. The requirements for 2.3L engines have not been changed for 2021. The rules have required all 2.3L engines to use a single inlet restrictor (SIR) since the sealed 2.3L engine was eliminated at the end of 2017. Please see the responses to letter #22614 in the October 2017 Fastrack Technical Bulletin, letter #23875 in the March 2018 Fastrack Technical Bulletin, and letter #28018 in the February 2019 Fastrack Minutes. Members may continue to run 2.3L engines in compliance with Spec Line G of the engine table.
Request displacement change for 2-Cycle 6 cylinder engines
#29901 from Jason Miller · Not recommended · Minutes (2021-01 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. A review of the data obtained during the 2020 National Championship Runoffs, including a request for additional views, has not shown that an adjustment to the two- cycle engine's displacement is warranted.
Elan DP02 IMSA-spec sealed engine
#29756 from Kevin Kloepfer · Not recommended · Minutes (2020-12 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. The sealed IMSA-spec 2.0L engine is not within the P1 performance envelope. In the U.S. Majors Tour event at Sebring, an Elan DP02 using the sealed engine qualified more than 11 seconds off the pole position time of a DP02 equipped with a modified engine, and at the 2020 Runoffs a DP02 using the sealed engine failed to qualify within 115% of the fastest P1 qualifying time and did not improve on its grid time after receiving a waiver for the race.
P1 Weight Reduction
#29683 from Keith Carter · Not recommended · Minutes (2020-12 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. On-track data obtained during the 2020 National Championship Runoffs confirms that the 1.0 liter platform's rate of acceleration is fully in line with and at no disadvantage to the acceleration rates of other P1 engine platforms, so a 50lb. weight reduction is not warranted.
Request to reduce horsepower of DP02 and FA conversions
#29621 from Johnnie Crean · Not recommended · Minutes (2020-12 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend these changes. The competitiveness of the Elan DP02 and FA conversions is not the result of a better power-to-weight ratio than other P1 platforms. On-track data obtained during the 2020 U.S. Majors Tour season and the 2020 National Championship Runoffs confirms that the acceleration rates of the 2.5 liter Elan DP02 and 1.6 liter FA conversions are fully in line with and have no advantage over the acceleration rates of other P1 engine platforms, so a reduction in power is not warranted.
13B Peripheral Port Rotary Restrictor
#29533 from Ed Dickinson · Not recommended · Minutes (2020-12 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. Balance of Performance (BoP) adjustments are used to bring an engine platform in line with other platforms' rate of acceleration in a speed range before aerodynamic drag has a significant effect. BoP adjustments are not used to equalize lap time performance or ensure overall competitiveness, and the Club Racing Board does not adjust power or minimum weight to balance differing chassis configurations. Data obtained during the 2019 U.S. Majors season shows that the Mazda 13B’s performance is fully in line with and at no disadvantage to other engine platforms' rate of acceleration, so removal of the 13B's inlet restrictor is not warranted. Please see the responses to letter #25759 in the January 2019 Fastrack Minutes and letter #27736 in the December 2019 Fastrack Minutes.
Request BoP for Stohr
#29232 from Johnnie Crean · Not recommended · Minutes (2020-10 Fastrack)
Thank you for your letter. This change is not recommended. The P1 Engine Table includes multiple engine types and displacements for which minimum weights and restrictor sizes have been established through the collection of on-track rate-of- acceleration data. The Club Racing Board does not have the resources to tailor alternative weight and restrictor combinations to the specific needs of individual competitors while ensuring a balance of performance with existing platforms.
P1 rules change letter requests
#28971 from Jim Downing · No action required · Minutes (2020-09 Fastrack)
Thank you for your letter. Please see the responses to letters #28809 and #28810 in this Fastrack.
RE: letter 28809 Turbo engines in P1
#28958 from Armen Megregian · No action required · Minutes (2020-09 Fastrack)
Thank you for your letter. Please see the response to letter #28809 in this Fastrack.
Reply to WDYT #28810 - Oppose closed-cockpit, single-seat cars
#28934 from David Locke · No action required · Minutes (2020-09 Fastrack)
Thank you for your letter. Please see the response to letter #28810 in this Fastrack.
Reply to WDYT #28809 - Oppose turbocharged engines
#28933 from David Locke · No action required · Minutes (2020-09 Fastrack)
Thank you for your letter. Please see the response to letter #28809 in this Fastrack.
Response to WDYT #'s 28809 and 28810
#28918 from Jeff Lederman · No action required · Minutes (2020-09 Fastrack)
Thank you for your letter. Please see the responses to letters #28809 and #28810 in this Fastrack.
Closed-cockpit, single-seat cars
#28810 from Formula/Sports Racing Committee · Not recommended · Minutes (2020-09 Fastrack)
Thank you for your letter. After reviewing the response to the WDYT published in the June 2020 Fastrack Minutes, the Club Racing Board does not recommend this change.
Turbocharged engines
#28809 from Formula/Sports Racing Committee · Not recommended · Minutes (2020-09 Fastrack)
Thank you for your letter. After reviewing the response to the WDYT published in the June 2020 Fastrack Minutes, the Club Racing Board does not recommend this change.
Closed-cockpit, single-seat cars
#28810 from Formula/Sports Racing Committee · Member feedback requested · Minutes (2020-06 Fastrack)
The Club Racing Board requests class stakeholder input on whether closed-cockpit, single-seat cars should be allowed in the P1 class. Please reply via the CRB letter log system.
Turbocharged engines
#28809 from Formula/Sports Racing Committee · Member feedback requested · Minutes (2020-06 Fastrack)
The Club Racing Board requests class stakeholder input on whether turbocharged engines should be allowed in the P1 class. Please reply via the CRB letter log system.
Request change in MZR 2.0
#28534 from Michael Major · Not recommended · Minutes (2020-04 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. Removal of the required restrictor is not supported by the data: the P1 rules permit cars using a 2.0L engine to weigh 75 lbs. less than those using a 2.5L engine. The Club Racing Board will continue to monitor class performance and will make appropriate, data-based adjustments as necessary.
P1 Sealed 2.0L Engines
#28400 from Michael Major · No action required · Minutes (2020-03 Fastrack)
Thank you for your letter. Competitors have always had the ability to choose between running a DP02- spec sealed 2.0L engine without an inlet restrictor under Line F or an unsealed 2.0L engine with a 30mm SIR under Line G. Delaying the previously announced sunset date for the DP02-spec sealed engine option until 1/1/2021 does not affect a competitor's ability to run an unsealed 2.0L engine during the 2020 season.
Request more data input with data boxes
#28198 from Keith Carter · No action required · Minutes (2020-03 Fastrack)
Thank you for your letter. The CRB appreciates the concern for collecting sufficient data for decision making. There are many factors that influence data collected at any given event; track configuration, CLUB RACING BOARD weather conditions, and most important entry list. For Major’s events the entry list is reviewed and must represent a reasonable mix of engine platforms for data to be collected. The CRB will continue to monitor the entry lists and collect data where there is a reasonable expectation of good data being available.
Sealed Elan Engine
#27867 from Jeff Shafer · Not recommended · Minutes (2020-01 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. On-track performance shows that the sealed DP02-spec 2.0L MZR engine is not within the performance envelope of the P1 class, but suitable modifications to the 2.0L engine will allow it to be competitive using the required Single Inlet Restrictor.
Rotary Engine Specs in P1
#27736 from Jim Downing · Not recommended · Minutes (2019-12 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. Although Balance of Performance (BoP) adjustments are used to allow different platforms to race together in the same class, the criterion for a BoP adjustment is limited to a car's rate of acceleration in a speed range before aerodynamic drag has a significant effect -- typically between 60 and 100 mph. BoP adjustments are not used to equalize lap time performance, ensure overall competitiveness, or boost class entries. Data obtained during the 2019 U.S. Majors Tour event at Virginia International Raceway showed that the Mazda rotary-powered car's rate of acceleration was fully in line with and not at any disadvantage to the other platforms' performance, so the removal of the car's inlet restrictor is not warranted.
Request for Weight Reduction Consideration for P1 - 1000cc Engine
#27649 from Greg Bell · No action required · Minutes (2019-12 Fastrack)
Thank you for your letter. Please see the response to letter #27596 in this Fastrack.
Request P1 BOP Comments and Line F Proposed Changes
#27639 from Jim Devenport · Not recommended · Minutes (2019-12 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend these changes. Although Balance of Performance (BoP) adjustments are used to allow different platforms to race together in the same class, the criterion for a BoP adjustment is limited to a car's rate of acceleration in a speed range before aerodynamic drag has a significant effect -- typically between 60 and 100 mph. BoP adjustments are not used to equalize lap time performance or ensure overall competitiveness, and the Club Racing Board does not adjust minimum weight or power to allow for differing aerodynamic configurations, brake systems, or chassis setups. Data obtained during the National Championship Runoffs shows that the CN car's rate of acceleration was fully in line with and not at any disadvantage to the other platforms'
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performance, so adjustments to the car's minimum weight and power are not warranted.
Weight Reduction Request for 1000cc Cars
#27596 from Keith Carter · Not recommended · Minutes (2019-12 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. Although Balance of Performance (BoP) adjustments are used to allow different platforms to race together in the same class, the criterion for a BoP adjustment is limited to a car's rate of acceleration in a speed range before aerodynamic drag has a significant effect -- typically between 60 and 100 mph. BoP adjustments are not used to equalize lap time performance or ensure overall competitiveness, and the Club Racing Board does not adjust minimum weight or power to allow for differing aerodynamic configurations, brake systems, or chassis setups. Data obtained during the National Championship Runoffs shows that the 1000cc car's rate of acceleration was fully in line with and not at any disadvantage to the other
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platforms' performance, so an adjustment to the car's minimum weight is not warranted.
Request to review the class disparity
#27257 from Keith Carter · No action required · Minutes (2019-09 Fastrack)
Thank you for your letter. Please see the response to letter #27256 in this Fastrack.
Request Balance of P1 engines
#27256 from Greg Bell · Not recommended · Minutes (2019-09 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change at this time. No competition adjustments will be made during the remainder of this season. The Club Racing Board will review the data obtained this season, including during the Runoffs, and will make appropriate adjustments as necessary for the 2020 season.
Spec Line F of P1 Engine Table
#26836 from Jim Devenport · Not recommended · Minutes (2019-06 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. The minimum weight is correct for the current power level and is supported by both acceleration rate data and lap time performance.
Request Correction to P1 Spec Line E Minimum Weight
#26757 from Stan Clayton · Not recommended · Minutes (2019-06 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. The minimum weight is correct for the current power level and is supported by both acceleration rate data and lap time performance.
Request to release weight and intake for Staudacher race cars
#26710 from Jim Cain · Not recommended · Minutes (2019-05 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. The P1 rules permit the Staudacher chassis to run at a lighter weight than all other 1000cc cars, and the required intake restrictor properly compensates for the Staudacher’s weight allowance.
Car classification request by Praga dealer
#26666 from Athar Qureshi · Not recommended · Minutes (2019-05 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend classification because the Praga R1 Turbo and Praga R1 Turbo Evo are outside the P1 class philosophy. Please see the response to letter #21457, June 2017 Fastrack Minutes. Competitors may race in the Regional only ASR class.
Request for Competition Adjustment to Help P1/P2 Participation
#25759 from Jim Downing · Not recommended · Minutes (2019-01 Fastrack)
Thank you for your letter. The CRB does not recommend this change.
FIA Certificate for Honda K20
#25578 from Jim Devenport · Taken care of · Minutes (2019-01 Fastrack)
Thank you for your letter. The CRB does not recommend this change. Please see the response to letter 25949, Technical Bulletin.
Request New Engine Supplier for P1 and P2
#24959 from Jonothan Benefield · Not recommended · Minutes (2019-01 Fastrack)
Thank you for your letter. The CRB does not recommend this change. Please see the response to letters #25949 and 25950, Technical Bulletin.