Fan Info - INDYCAR 101 - Rulebook - Chapter 14: Technical Specifications

Download Updated Rulebook: 2019 NTT IndyCar Series Rulebook (Full)

IMPORTANT: The rulebook content below was released to all parties on March 1, 2019, and should be considered UNOFFICIAL. No in-season amendments or bulletins are reflected in the below copy. Please refer to the above PDF link for the updated rulebook.


14.1. General 

14.1.1. INDYCAR shall maintain a technical site on (IRIS) for Members to submit questions and INDYCAR to provide technical information or provide various technical updates when necessary.

14.1.2. Questions to be submitted and will be answered via IRIS. Modifications must be approved seven (7) days prior to the date of intended use.

14.1.3. All parts provided by an Approved Supplier must be used as supplied without modification unless otherwise approved by INDYCAR and stated in these Rules or in update bulletins.

14.1.4. Approved Suppliers must submit bulletins to INDYCAR for approval prior to releasing bulletins to Entrants. Once submitted bulletins are approved by INDYCAR, Members are subject to enforcement by INDYCAR.

14.1.5. All original Manufacturer identification markings and/or tags must remain as supplied.

14.1.6. Tape is not permitted as a single source of attachment for any component.

14.1.7. The drink bottle, if utilized, must be installed in one (1) of the following locations: on the top side of the underwing, under the structural front sidepod, or on the structural front sidepod. For all Events excluding the Indianapolis 500®, the drink bottle and accessories may be installed at all times. The drink bottle may not have any content until the Race. For the Indianapolis 500® race, the drink bottle and accessories may not be installed until Carburetion Day.

14.1.8. Entrants must utilize mufflers (Supertrapp 443-2010 4”) in garage area when engines are started. At Events where garage structures are utilized, Entrants must roll Cars out from under roof when Engines are started.

14.1.9. Anodizing of parts is permitted.

14.2. Development Areas, Reproduction Parts, and Direct Purchase Parts

14.2.1. Development Areas The following areas are open for development. The mating part(s) must remain as supplied, and the areas must otherwise comply with the Rules. Non-Engine oil and greases, Dampers and inerters (Rule 14.10), Treatments and coatings of the inside of the gearbox and/or gearbox internals, Treatments and coatings of all bearing surfaces. Bearings and bearing races (excluding upright and gearbox bearings) provided they are of the same size, type and design as originally provided by the Approved Supplier. Hybrid and/or ceramic bearings are not approved for use. Fuel cell collector pot (the fuel cell collector pot must remain inside the fuel cell, must have a -6-port plug drain at the base of the collector, and must fill during an INDYCAR performed fuel cell capacity check), Refueling hose end that connects to the tank, Internal brake ducting must be completely contained within the brake duct. Brake bias cable (concept of operation must remain the same as the supplied bias cable) Bushings, Plumbing, Water pipes, Oil pipe (at least a six (6) inch flexible section must remain at the radiator end of the pipe), Plumbing of the fuel cell lines, All other plumbing is limited to a change of line type, size, fittings, and routing. Spacers, Drive peg extensions, Pushrod ends, Anti-rotational devices are permitted on pushrods and toelinks, provided they remain parallel to the mounting surface. Devices must be submitted to INDYCAR via IRIS for approval. Anti-roll bar adjusters must be submitted to INDYCAR via IRIS for approval, Nuts and bolts including bolt head types, Heat shielding other than fabrics or sleeving must be submitted to INDYCAR via IRIS for approval. Pedal heads must be submitted to INDYCAR via IRIS for approval, Speedway front wing adjuster knob, Brake master cylinder rod extensions, Throttle damper extension, Brake pedal pivot bushing, Seals – except for those listed in Rule 14.16.3. Studs – except for those listed below:


14.2.2. Reproduction Parts The parts listed below may be reproduced or purchased directly from Dallara. The parts must be consistent with the approved drawings including material. Any variations from the approved drawings must be submitted to INDYCAR via IRIS for approval. Specific details and drawings related to each part are available on the INDYCAR ePaddock (Approved Development Drawings). Airjack receptacle (the airjack receptacle must remain in the INDYCAR-approved location), Pedal stems, Pedal brackets, Wheel nut socket conical guide, Rear shock shear plates, Rockers, Anti-Roll Bar drop links, Anti-roll bar blades, and Anti-roll bars. The parts listed below may be reproduced or purchased directly from Approved Suppliers. The reproduced part must be consistent with the original approved part including material. Any variations from the approved part must be submitted to INDYCAR via IRIS for approval. Refueling hose-to-probe connectors:

  • Rapid Prototyping & Engineering, Inc. (Part #INDYCAR 0512), or
  • Checkered Past Machine (Part #CPIC060).

14.2.3. Direct Purchase Parts Entrants may purchase the following parts directly from the INDYCAR Approved Supplier: Water radiators:

  • PWR Water Radiator CR-UGMPR047C
  • PWR Water Radiator PWR78165
  • PWR Water Radiator 19010-FC8ZA-111M2
  • Mezzo Water Radiator 1549-1000
  • Mezzo Water Radiator 19010-FC8ZA-021M1
  • Mezzo Water Radiator 1549-8000 Oil radiators:

  • PWR Engine/Gearbox Oil Cooler CR-UC-MQC003B PFC Brakes:

  • Discs 328.30.0044.24
  • Disc bells front 218.779.128.15 and rear 218.779.307.15
  • Pads 7990.0002.24.01
  • Calipers 90.328.365.01/02
  • Disc mounting hardware and bobbins per INDYCAR-approved PFC Order Form (available at - PFC Order Form). Premier fuel cell bladder part # 1200-0518 IRL125014 4 Fuel Bladder.

14.3. Technical Inspection

14.3.1. INDYCAR decides the factors in inspection, and it may vary by Entrant, portion of Event and/or Event. INDYCAR decides the order of inspection. Entrants are required to have the tools necessary to fulfill work as requested by INDYCAR. A penalty may still be issued, even if the Car or part completed inspection at an earlier Event and/or earlier portion of the same Event.

14.3.2. The responsibility remains with the Entrants to make sure Cars conform to all Rules throughout the course of an Event.

14.3.3. Reference planes and '0' coordinates All measurements shall be taken from the reference plane or ‘0’ coordinates. These shall be established by Dallara and cannot be modified. References will be measured using the following coordinates:

  1. “X” coordinate is defined as the relative location fore and aft of the front face of the forward chassis bulkhead - “0” being the forward face of the chassis. These measurements will be referred to as +/- the “X” line, with – (negative) being forward.
  2. “Y” coordinate is defined as the location laterally from the chassis centerline, Driver’s right-hand side being positive.
  3. “Z” coordinate is defined as the location vertically with the bottom of the skid being 0 ‘Z’, + (positive) being up.

The bottom of the skid establishes the "chassis reference plane." For purposes of technical inspection, the “chassis reference plane” is 1.000 inches above the plane established using “Tech Tool Monocoque Nosepin Machined Plate, IR1201977” and the gearbox reference puck as defined in “Xtrac Technical Bulletin 020” and “Dallara Technical Bulletin IR15 13.01 (2015).

14.3.4. The engine and gearbox installed angle is minus 0.10 degrees to 0.10 degrees relative to the ‘0’ line.

14.3.5. INDYCAR may inspect, impound and/or confiscate any Car, part, equipment, item, or data associated with a Car or its operation during an Event at any time. INDYCAR is not responsible for damage or loss as a result of inspection procedures, impounding, or confiscation. Entrants must submit to INDYCAR via IRIS (under the Technical Data section) a complete Cosworth dataset from the outing that contains the fastest lap after practice session one (1), Qualifications, and the final practice session, within one (1) hour after completion of the session. INDYCAR may request additional datasets.

14.3.6. The maximum amount of fuel allowed in the Car when coming through Entrant-initiated technical inspection is six (6) gallons. The Car must be empty of fuel when being weighed.

14.4. Car Weight and Driver Equivalency Weight

14.4.1. Car Weight The minimum weight shall include the car in ready-to-compete condition, excluding Driver, Driver Equivalency Weight, fuel and drink bottle content. Minimum weight for Road/Streets Events – will be 1630 pounds. Minimum weight for Speedway Events – will be 1590 pounds. Minimum weight for Short Oval Events – will be 1620 pounds. The only approved ballast location is the keel.

14.4.2. Driver Equivalency Weight. INDYCAR specifies the Driver Equivalency Weight. INDYCAR shall notify each Entrant of its Driver Equivalency Weight. Driver Equivalency Weight must bring the combined weight of the Driver and Driver ballast to 185 pounds. INDYCAR may weigh any Driver and adjust the Driver ballast accordingly. Drivers over 185 pounds are allowed a Car weight reduction equal to the amount the Driver exceeds 185 pounds. The Driver ballast weight tolerance is 0.00 to + 1.00 pounds. The Driver Equivalency Weight must be installed and secured in the designed location forward of the seatback. This location may only be used for Driver ballast. In addition to the above specified location, a 10-pound (tolerance 0.00 to + 0.50 pounds) Driver ballast weight may be added to the front face of the pedal bulkhead as per approved drawing supplied by Dallara. This location may only be used for Driver ballast and only for Drivers requiring 10 pounds or more ballast. The Driver Equivalency Weight must be a hard-dense metal. Violation of this Rule may result in a minimum $100,000 fine and/or other penalties. All Drivers are reweighed at technical inspection within fifteen (15) minutes after completion of practice session one (1) of a Race Event. Drivers must wear the following personal safety equipment: uniform, underwear (top and bottom), socks, and shoes. A Driver late for weigh in loses ten (10) minutes from the end of the next practice session. A Driver failing to appear for weigh in may not participate in practice and/or Qualifications until he/she has completed the weigh in. Driver ballast changes are subject to the following: A Driver weight change of plus or minus 3 pounds: Car and/or Driver weight will remain unchanged, and Entrants may not change their Driver ballast. A Driver weight change of more than plus or minus 3 pounds: Entrants must change their Driver ballast before the current Race’s Qualifications.

14.4.3. A Driver weight change of more than plus or minus 7 pounds: Entrants may be subject to penalty

14.5. Chassis

14.5.1. Timing Transponder – The timing transponder must be used in the designated location as supplied by INDYCAR at all times.

14.5.2. Mirrors Lens – The minimum mirror glass dimension is 6.000 inches wide by 2.000 inches tall with a corner radius of 0.375 inches. No portion of the mirror lens may be recessed in the mirror housing by more than 0.250 inches. The standard Dallara mounting location for the lens must not be moved and the housing must be trimmed to comply with the 0.250-inch dimension.

14.5.3.Mirror housing must be used as supplied and in the designated location.

14.5.4. Windscreen – All windscreens must be submitted to INDYCAR via IRIS for approval prior to use.

14.5.5. Car Tracking System, In-Car Cameras and On-Board Video Equipment Car Tracking System – The INDYCAR-approved car tracking system must be installed in the designated location(s) on each Car and must be operational at any time the Car is participating in on-Track Events. In-Car Cameras – Upon INDYCAR’s request, on-board cameras must be used as supplied by Broadcast Sports, Inc. If INDYCAR does not request an on-board camera be used, dummy camera equipment must be used. On-Board Video Equipment – Entrants must utilize only the AIM on-board camera (XA1SGPH22PB840106U) during all on-track activities. The camera must be mounted per Dallara in the designated location.

14.5.6. Additional Cameras – Any additional camera may only be used with prior INDYCAR approval.

14.6. Dimensions

14.6.1. Wheelbase The maximum wheelbase is 121.500 inches and minimum is 117.500 inches. The wheelbase of the Car, left to right, may have a maximum variance of 0.750 inch.

14.6.2. Track Width (measured at axle center line) A maximum shim of 4mm may be used under the top rear wishbone studs and the rear toe link studs only. Spacers must be the same thickness for both front and rear wishbone legs. Oval Events – Front and rear are limited to a minimum of 75.750 inches and a maximum of 76.750 inches. Road & Street Course Events – Front and rear are limited to a minimum of 75.500 inches and a maximum of 76.500 inches.

14.6.3. Track Width Offset Oval Events – The Car can be between 0.150 inches off center to the left or 0.600 inches off center to the right. Road & Street Course Events – A maximum of plus or minus 0.250 inches is permitted left or right of center.

14.7. Aerodynamics

14.7.1. Engine installation components must be used as supplied without modification.

14.7.2. Radiator screens must be installed during all on-track activities.

14.7.3. All aerodynamic components must be run symmetrically except the following:

  • Road / Street & Short Oval front wing flap angles
  • Speedway front wing end plate angles
  • Speedway front mainplane inboard trailing edge extension
  • Speedway front wing wickers
  • Radiator blanking
  • Brake duct blockers
  • Underwing sidewalls
  • Underwing strakes

14.7.4. Attachments or devices that are movable or adjustable while the Car is in motion and which may affect airflow or aerodynamics are not permitted.

14.7.5. Wickers Wickers must be used as supplied by Dallara without modification. The only form of fastener permitted for wicker attachment is bolts. No tape or adhesive is permitted.

14.7.6. Front Wing

All Events The complete front wing assembly must be used as supplied without modification. Paint, adhesive film, or any other substance may not be added to the underside of the mainplane from a point two (2) inches behind the leading edge of the wing to the trailing edge of the wing. Shimming of the front wing mainplane is permitted to achieve heights and wing angle within the Rules. Endplate mounting holes may be modified to accept top-hat bushings; provided the endplate, wing flaps and mainplane remain in the designed location. Front wing configuration must be as listed in the Race Location Specific chart below:

Front Wing Config - All 

Road / Street & Short Oval Events Front wing must adhere to the following Technical Inspection dimensions:

Front Wing Config - R/S 

Indianapolis 500® Mile Race & Speedway Events The bottom of the mainplane must not be less than 4.330 inches above the technical reference plane when the mainplane is set to 0°. For the purposes of technical inspection, the front wing must not measure less than 8.300 inches when set at any angle, while installed on the INDYCAR technical inspection fixture. Front wing must adhere to the following Technical Inspection dimensions:

Front Wing Config - SS 

14.7.7.  Rear Wing

All events The complete rear wing assembly must be used as supplied without modification. The top surface of the mainplane must be covered with a one-piece decal wrap. The mainplane wrap must start at the trailing edge and extend one (1) inch around the leading edge of the lower surface. For Events utilizing the speedway rear wing, the top surface of the wing will end where the radius begins for the endplates. The mainplane wrap may have printing and decals applied, provided the printing or decals are approved by INDYCAR prior to use. One 2.0-inch strip of helitape may be placed along the leading edge of the mainplane, provided it is applied 1.0 inch below and 1.0 inch above the centerline of the leading edge of the mainplane. The rear wing mainplane may not be painted. During initial technical inspection at each Open Test and Race, the rear wing mainplane must be presented without the mainplane wrap, if requested by INDYCAR. Shimming of the rear wing mounting blocks is permitted to achieve heights, set-back and wing angles. Rear wing configuration must be as listed in the Race Location Specific chart below:

Rear Wing Config - All 

Road / Street & Short Oval Events Rear wing must adhere to the following Technical Inspection dimensions:

Rear Wing Config - R/S 

Indianapolis 500® Mile Race & Speedway Events Rear wing adjuster is mandatory and the Dallara-supplied lock nuts to limit travel must be installed, when applicable. The Rear wing mainplane must not have more than 0.100 inches of tilt in the “Y” coordinate. Rear wing must adhere to the following Technical Inspection dimensions:

Rear Wing Config - SS 

14.7.8. Bodywork & Underwing The complete bodywork, underwing and underwing stays must be used as supplied without modification. Holes that do not exceed .375 inches may be added to the underwing or underwing parts for hardware access. Holes must be covered during on-track activities. The inboard bell housing and gearbox stays must be used as supplied and fixed in the neutral position. Standard bodywork and underwing as supplied in technical inspection must be able to fit and be fastened at any time, using all original fasteners. No paint may be added to the underwing surface from a point 2.000 inches behind the leading edge of the underwing. From this point after, only clear coating may be applied. Ballast cannot be bolted or bonded to the underwing. All included fasteners must remain and be in the locations as delivered. Tape may be applied to bodywork and chassis junctions or openings providing there is no change to the intended shape or profile of the original part. Tape or covering may not be applied to the nose camlock holes, access holes through the engine cover to the attenuator camlocks, tow bar holes or; nose to chassis, shock cover to chassis or the headrest to chassis split lines. The right-side NACA Duct in the Underwing Top Panel RH (IR1803A015) must remain open, the Bellhousing Cooling Duct (IR1803A023) and Bellhousing Cooling Duct Flange (IR1803A024) must be installed and the airflow unrestricted. The left-side NACA Duct in the Underwing Top Panel LH (IR1803A016) must remain open and the airflow must remain unrestricted. Internal ducting of the air is open for team use. Only homologated radiator blanking may be used. Holes in the blanking panel for mounting bolt access are permitted, provided they are covered during on-track activities. Approved external IR tire temperature sensor mounting locations: The front IR tire temperature sensor must be mounted to the underwing, under the Underwing Hole Front Panel SW IR1803A07/08 or Underwing Hole Front Top Panel RC IR1803A11/12. The covers must have a window designed to return them to their original shape. The rear IR tire temperature sensor must be mounted in the Underwing Rear Blanking Panel IR1803A17/18. Bodywork and underwing configuration must be as listed in the Race Location Specific Charts below:

Bodywork Config 

Underwing Config Bodywork & underwing must adhere to the following Technical Inspection dimensions:

Tireramp/Underwing Config Bodywork Fitting The following parts may be blended to reduce uneven surfaces and gaps. Hard edges may be tapered or blended. These parts must remain separate parts and there must be a distinct joint line defining each part from its mounting surface or part(s). They must detach from their mating part(s) with the removal of the Tridairs or bolts. All intended shapes and radii must remain as designed. No tongue-and-groove, dovetail, or other types of body fitting will be permitted. Extra fasteners are permitted. The Roll Hoop Cover Sidepods, Structural Front Sidepods, Refueling Panels (may have material added to the inside surface for additional strength), Refueling Panel Covers, Engine Cover (Kevlar patches may be added to improve TPMS data reception), Damper Cover, Tire Ramps, Mirrors, Underwing leading edge to tub, Rad Boxes, Top Center Part of the underwing (may be sectioned in the designated location), and Fuel funnel faring (refueling Buckeye sleeve) and the lower portion may be modified to fit the sidepod profile. The following parts and any bodywork or underwing part not listed may not be fit as above, sanding to improve fit is permitted. All other types of body fitting are prohibited. These parts may be installed using silicone or 2-sided tape provided it does not change the installed height by more than 0.020 and they must use the supplied fasteners. The silicone must not be seen when viewing the part from any angle. Extra fasteners are permitted. Underwing packers, all underwing leading edge and trailing edge covers (holes may be added in the cover to access the underwing support hardware), underwing strakes and sidewalls, underwing flaps and flap parts, and engine cover fin. underwing flip-ups

  • Must have a fluorescent yellow stripe (six (6) inches tall by four (4) inches wide) on the bottom side of the flip-up, which becomes visible when the flaps are deployed. The monocoque reinforcement extension, the anti-intrusion panel, the 2014 chassis reinforcement panels and the 2015 FLWB anti-intrusion plate (Dallara etching must remain visible) may be blended until there are no distinctions between parts. The headrest to the chassis cockpit rim interface may be blended and the height of the headrest may be adjusted to provide an even surface, provided no material is added to the headrest. The following may be blended until there is no distinctions between parts: Center Line Wicker – The center line wicker attached to the nose and chassis Left-Hand Side Pod Louver Cover AiM Camera mount Nose camera mount Bodywork flanges may be trimmed for plumbing and wire clearance, provided the bodywork integrity remains.

14.7.9. Underwing The underwing step plane heights must adhere to the following illustration. The heights have a tolerance of plus 0.100 inches and minus 0.100 inches. The underwing tunnel exit height must adhere to the following illustrations. The height has a tolerance of plus 0.050 inches and minus 0.050 inches.

Road / Street

Underwing - R/S

Short Oval Events

Underwing - Short Oval

Indianapolis 500® Mile Race & Speedway Events

Underwing - SS

14.7.10. Skids Skids must be made to the drawings supplied by Dallara. “X” coordinate split lines may be moved, and original puck holes may be removed. Skids must be made from 3.0mm material or 0.125-inch material. Approved materials are brass, carbon, stainless steel, aluminum, jabroc and plastic. One-piece skids are permitted.

14.8. Fuel System

14.8.1. The fuel system must be used as supplied by Dallara, with the following exceptions: Standard elephant trunk (IR1214C002) must be used but the foot may not be less than 3.000 inches from the floor of the fuel cell. Breather holes may be added or removed. Standard fuel bladder vent (IR1214C001) must be used but can be modified for fuel cell height. Breather holes may be added or removed. Plumbing of the fuel cell lines are open to development. Filters may be added or changed. Pressure sensors may be added provided they otherwise comply with the Rules.

14.8.2. The maximum capacity of the fuel cell shall be 18.500 U.S. Gallons. The only approved method of fuel cell volume reduction is by the addition of fuel cell airtight balls inside the fuel cell.

14.8.3. Lanyard-secured self-sealing breakaway valves must be used on the supply and return lines. All installations are subject to the approval of INDYCAR.

14.8.4. In the event a fuel cell buckeye is not being utilized at a Race Location, a blanking plate with a minimum thickness of 0.250 inches must be securely fitted utilizing all of the holes in the fuel cell.

14.9. Steering and Suspension

14.9.1. Steering wheels must incorporate an approved quick release mechanism (Rule 18.1.17.).

14.9.2. Only the Dallara supplied parts and rack and pinion options may be used. Modifications to the pinion bearing are permitted with INDYCAR approval.

14.9.3. Only the Dallara supplied suspension parts may be used. Steel steering arms may be updated to the Dallara drawing referenced below.

Steering Suspension Parts

14.9.4. Suspension parts may not be controlled or activated electronically, with the exception of the weight jacker.

14.9.5. One weight jacker may be used at Oval Events only. This must be fitted on a rear damper of the Car with a maximum travel of 0.500 inch. This must be controlled through the approved control box to which no modifications are permitted.

14.10. Dampers and Inerters 

14.10.1. Damper is a mechanical device utilizing hydraulic fluid to dissipate energy.

14.10.2. Each corner must have one damper and one conventional spring. Each spring must be comprised of round, steel wire. Closed and/or ground ends are allowed. Bump rubbers and packers are permitted.

14.10.3. Front and rear third control springs, bump rubbers and packers are permitted. No front or rear third dampers, inerters or any other device are permitted nor any modification to the manufacturer supplied parts.

14.10.4. Carbon and/or titanium springs are not permitted on the dampers or the front/rear third element.

14.10.5. The dampers must operate independently on each corner of the suspension; they must react directly to the input of that corner as connected to the suspension system.

14.10.6. The damper must be attached at one end to the chassis mounting point and the other end directly to the suspension rocker.

14.10.7. Connecting dampers side-to-side (except through the ARB) or front to rear is not permitted.

14.10.8. Dampers cannot be adjusted by the Driver.

14.10.9. The damper assembly must be contained within the approved designated volume. This CAD file is available from Dallara.

14.10.10. No independent inerters or mass dampers are permitted.

14.11. Driveshafts / Hubs

14.11.1. Only Dallara parts may be used as supplied.

14.11.2. Dallara wheel lock parts must be used as supplied.

14.11.3. Upright bearings must be used as specified by Dallara.

14.11.4. Bearing spacers (IR1207B015 / IR1209B005) may be machined for bearing pre-load.

14.12. Energy Management System (EMS)

14.12.1. General EMS must be used as supplied by ARCR/Amick Associates and approved by INDYCAR. All mounting points must be free of sharp edges. The EMS must be replaced if damaged or as required by INDYCAR. EMS will be color-coded per production year.

14.12.2. Front and Rear Suspension Three (3) 100kN EMS per suspension corner mounted as specified by Dallara. All Front and Rear Suspension EMS must be color-coded yellow.

14.12.3. Nose EMS Two (2) 30kN EMS mounted as specified by Dallara. The Dallara-supplied mounting block (IR1204A026) may be bolted or adhered to the bulkhead.

14.12.4. Nosebox Locking Shaft EMS Two (2) 30kN EMS connecting the left and right-side shafts

14.12.5. Front Wing EMS One (1) 30kN EMS connecting the left and right front wing mainplane as specified by Dallara.

14.12.6. Rear Wing EMS All Events – One (1) 100kN EMS between the attenuator and the gearbox Road Course / Street & Short Oval Events – One (1) 100kN EMS between the mainplane and the attenuator Indianapolis 500® & Speedway Events - One (1) 30kN EMS between the mainplane and the attenuator

14.12.7. Underwing EMS One (1) 30kN EMS per side mounted as specified by Dallara.

14.12.8. Camera and Dummy Camera EMS One (1) 30kN EMS attached to the front camera / dummy camera, mounted as specified by Dallara One (1) 30kN EMS attached to the rear camera / dummy camera, mounted as specified by Dallara

14.12.9. Mirror EMS One (1) 30kN EMS per side mounted as specified by Dallara.

14.13. Brakes

All Race Locations

14.13.1. Brake ducts must be used as supplied without modification. Unused holes or gaps may be filled. To access the brake caliper bleeder, a hole 0.375-inch or less may be added to the brake duct backing plate. This hole must be covered during on-track activities. Ducts may be extended inward (towards rotor), provided there is no change to the intended shape.

14.13.2. Only brake parts as supplied by Approved Suppliers and approved by INDYCAR are allowed. PFC – discs, pads and disc bells Brake disc and pad thickness The minimum disc thickness is 0.826 inches. The minimum pad thickness is 0.433 inches. Brembo – master cylinders A migration system (consisting of a spring perch, spring, packers and washers) applied to the master cylinder push rod is permitted. Dallara – disc guards

14.13.3. Cars must be equipped with a dual-braking system to operate the brakes effectively on all four (4) wheels. The use of computer logic to control any function of the braking system is not permitted.

14.13.4. The only permitted form of brake bias adjustment is through the Dallara-supplied system. Any relocation of the brake bias adjustment knob must be submitted to INDYCAR via IRIS for approval.

14.13.5. The PFC pad-retraction system is the only device designed to push or pull back caliper pistons or pads that is approved for use. Pull back brakes in any other form are not permitted.

14.13.6. Only tape, flat panels, or panels that follow the front contour of the brake duct or brake snorkel may be used as blockers to regulate the airflow into the brake duct or brake snorkel.

14.13.7. The following Dallara brake disc guards must be used:

  • Front IR1210E007 / 08 – as supplied
  • Rear IR1810H012 / 13 – as supplied or trimmed 1.00 inch per illustration

Rear Brake Disk Guard Shim

14.13.8. Brake duct configuration must be as listed in the Race Location Specific Chart below:

Brake Duct Config

14.14. Wheels

14.14.1. Wheels must be used as supplied without modification.

14.14.2. The rim width for front wheels is limited to 10.000 inches. The rim width for rear wheels is limited to 14.000 inches.

14.14.3. The only wheel designs approved by INDYCAR are BBS and OZ. Only INDYCAR-approved finishes may be used on wheels.

14.14.4. The use of wheel covers or inserts is prohibited.

14.14.5. Any machining or modification of an approved wheel requires the approval of INDYCAR.

14.14.6. The wheel offset may not be modified from design. Subject to Rule 14.14.5, the wheel may be shimmed to bring the wheel back to the designed specification (with the addition of a spacer). The following tolerance must be adhered to when measuring from the high point of the wheel inboard flange to the wheel mounting face.

  • Front wheel min. 6.125”, max. 6.225”
  • Rear wheel min. 7.750”, max. 7.850”

14.14.7. Wheels must be NDT (non-destructive testing) inspected by an INDYCAR-approved inspection station prior to the Entrant’s first on-Track Event, prior to the Indianapolis 500® Mile Race Event and prior to the Pocono Event.

14.14.8. The service life of wheels is six (6) years from the in-service date, or the equivalent of six (6) years in service use. Wheels may only be used beyond the six (6) year period with INDYCAR approval. Wheels used only at the Indianapolis 500® Mile Race will be considered to have used ½ of a year’s wheel life.

14.14.9. A copy of all wheel serial numbers must be submitted to INDYCAR for approval before the designated on-Track Events. Serial numbers must be visible while wheel is mounted on Car.

14.14.10. Tire pressure bleeding must be done manually, through the Schrader valve, and only while the Car is stationary.

14.15. Heating and Cooling

14.15.1. No forms of heating may be used on a Car when the Car is outside its assigned garage.

14.15.2. The following forms of cooling are permitted: At any time

  1. Cooling towels applied to bodywork,
  2. Driver cooling fans,
  3. Self-contained, battery-powered electronic box cooling fans through the supplied electronics inlets or direct application only (must be submitted to INDYCAR via IRIS for approval), In assigned Pit Box only:

  1. Brake cooling fans,
  2. Electronic box cooling fans, through the radiator inlets or direct application only. In assigned Garage only:

  1. Blown ambient air with up to two (2) fans that have ducts or shrouds extending no further out than one (1) times the diameter of the fan blades in either direction (measured from the center of the fan) and the air may not be cooled in any form as it passes through the fan. The fans can only be used to flow air into the front of the radiator boxes. No component may be installed, nor any fluid may be added to the Car at any time at a temperature below that of the ambient air with the exception of the Driver’s drink bottle. Use of chemicals to cool the air and/or Car components is also prohibited.

14.15.3. Cooling the inside of the fuel cell is not permitted at any time.

14.15.4. Thermostats – Thermostats or bypass valves are not permitted on any cooling system.

14.16. Gearbox / Differential 

14.16.1. Only gearbox parts and gear ratios provided by Xtrac may be used with the exception of Rule 14.16.3.c).

14.16.2. Treatments and coatings are open to development; the Xtrac logo/etching must remain on all original parts.

14.16.3. Original rotary lip seals that are etched with the Xtrac part number and logo must be used as below:

  1. 00P-100-0111A, 40x52x7 Lipseal, Used in Front Cover (Input Shaft) and Rear Cover (Starter Shaft).
  2. 00P-100-0109A, 98x120x12 Lipseal, Used in Side Cover (LH Output Flange) and Maincase (RH Output Flange).
  3. Remaining gearbox seals are open.

14.16.4. The approved paddle shift gear selection system must be used at all Race Locations. The paddle shift system must be used as supplied. The paddles may be extended, and a simple system added to increase driver feel. Any modifications must be submitted to INDYCAR via IRIS for approval.

14.16.5. Only the following CCUs (clutch control units) are permitted and must be used as supplied:

  1. Megaline E-CCU 195-0009, bracket E-CCU 1011-919-000C and corresponding looms
  2. Shiftec CZM022-3. Air pressure accumulator IR1217F006 must be run with any CCU.

14.16.6. The gearbox must maintain all six (6) fully meshed gears during an on-Track Event. Reverse gear must be operational throughout all on-Track Events.

14.16.7. Entrants must provide seal locations comprised of two (2) drilled holes with a minimum of 0.032 inches in each of the following locations:

  1. Gearbox to bellhousing
  2. Gearbox rear and side covers
  3. Bellhousing to the Engine
  4. Engine to the bulkhead

14.16.8. All parts of the differential assembly must be used as supplied without modification by Xtrac.

XTrac Differential Parts

14.16.9. The differential clutch stack may be re-arranged and any combination of 10 total friction (199-290-007A) and drive plates (094-290-008A) may be used, provided all parts remain as supplied.

14.16.10. The disc spring (00P-190-002B) is available in multiple stiffnesses from Xtrac and are all approved for use. The disc spring must remain on the right side of the differential assembly in the Xtrac approved location and shimming is not permitted.

14.16.11. The side gear ring (ramps) and cross pin must be used as supplied.

14.16.12. The preload piston is permitted to have inert gas, air or fluid behind the preload piston.

14.16.13. At Oval Events either an Xtrac supplied spool or differential with blocker must be used.

14.16.14. The gearbox must be vented to the atmosphere.

14.17. Airjack 

14.17.1. Entrants must leave the airjack receptacle in the INDYCAR-approved location.

14.18. Electronics 

14.18.1. General The only approved electronics for data logging is the Cosworth Omega system which includes the following:

  • Central Logging Unit (CLU)
  • Removable Logger Unit (RLU)
  • Synchronous Junction Unit (SJU)
  • Configurable Display Unit (CDU) with a CAN Switch Board (CSB) or the CAN Carbon Wheel (CCW) MkII
  • Intelligent Power System (IPS32) Teams are free to design their own steering wheel electronics, but must integrate the approved Cosworth display. All input switches on the steering wheel must indicate their position directly through the Cosworth CAN Switch Board (CSB) without any control interruption of the physical position of the switch. Entrants must not connect to the Car until released by INDYCAR at the completion of Qualifications, the Race, and/or as directed by INDYCAR. Entrants must maintain a system voltage of at least 13 Volts at all times while the Car is running on-track. INDYCAR-specified devices and control units may not be powered down, supplied improper voltage or disconnected while the Car is running on-track.

14.18.2. Only the following on-board Car batteries are permitted and must be used as supplied:

  1. EarthX Indy6
  2. Braille ML7Ti.v2

14.18.3. Ignition Switch All Cars must be equipped with an ignition switch that can be activated by the Driver. The ignition switch must be clearly marked.

14.18.4. Fire Bottle Switch The Dallara supplied fire bottle switch must remain in the specified location.

14.18.5. Master Switch The master switch must be used as supplied by Dallara. The switch must energize the on-board fire extinguisher and shut off the ignition. The switch must be clearly marked by a decal supplied by INDYCAR. Entrants must not disconnect the switch. When a master switch is pulled, it must remain in that state until manually reset.

14.18.6. Rain Lights Only the Dallara-supplied rain light may be used. The assembly must be mounted to the attenuator in the INDYCAR-specified location.

14.18.7. Electronic Logic Processors The use of electronic logic processors or devices to mechanically or electronically control any Car function or to activate or to interrupt direct input or control from the Driver to an INDYCAR-approved control unit is not allowed, except for INDYCAR-approved electronic control units. Such approved units include control of the following: Engine, Clutch, Gearbox, and Weight jacker. Only INDYCAR-approved data acquisition systems may be used. Electronic data of any type may not be transmitted wirelessly to a Car. The INDYCAR-approved data acquisition system may not be used to activate or to interrupt the direct transmission of Driver inputs and switches to destination INDYCAR-approved electronic control units except for the use of debounce with fixed time parameters. A single Driver input may not provide input to or activate multiple control functions. Control system override modes must not be used without a clear and readily-identifiable problem including any of the following:

  • Increased sensor noise or failure
  • Offset signals
  • Slow control actuation
  • Control fails to actuate

14.18.8. Chassis Sensors The following sensors may only be used as supplied by Approved Suppliers: Throttle pedal sensor (Cosworth or McLaren); Gear position sensor (Cosworth or McLaren); Gearbox temperature sensor (Cosworth, McLaren or Texense); Front and rear push rod load cells (Cosworth or bf1systems); and Wheel speed sensors (Cosworth, McLaren or Texense) The following additional chassis sensors are allowed: Tire pressure sensors; Brake pedal position; Brake master cylinder displacement; A maximum of two (2), 3-axis chassis accelerometers; A maximum of four (4) single axis hub accelerometers, 1 per corner; Strain gauged suspension parts; Strain gauged steering shaft; Beacon receiver; Laser ride height; Gyro or angular rate sensors; Roll bar positions; Weight jacker position; Clutch position; Any pressure sensor, limited to diaphragm-type; Any temperature sensor; and Fluid level sensor; No modifications may be made to any chassis or aerodynamic part to accommodate sensor mounting or sensor target. Any sensors listed above may be fitted to the Engine only with the Engine Manufacturer’s approval. Entrants may relocate the rear laser, only if the laser remains inside the bodywork and rear end cover (IR-1203A009). The location and mounting must be submitted on IRIS for INDYCAR approval.

14.18.9. Weight Jacker The weight jacker position can only be controlled by the Driver.

14.18.10. Track Condition Radio (TCR) The TCR and antenna must be mounted in the INDYCAR-specified location. The TCR dash light must be mounted in the INDYCAR-specified location. A minimum of two (2) TCR steering wheel lights must activate simultaneously with the TCR dash lights.

14.18.11. Black Flag Indicator A black flag indicator (text, and/or light) must be included in the dash/steering wheel configuration. INDYCAR triggers the black flag indicator through the timing transponder.

14.18.12. Car Position Display The LED Display Panel must be used as supplied and in the position specified by INDYCAR. The Car Position Display panel must be connected and operational during all on-Track activities.

14.18.13. Chassis and Engine Looms Chassis and Engine looms must be used as supplied by Cosworth and the Engine Manufacturers.

14.18.14. Push to Pass Parameters The total Push to Pass time and time per push per Race are as follows:

Push To Pass - 2019

14.18.15. Any attempt to reset tOvertakeTotalRemainingMaxMandated during a Race Event is not allowed.

14.18.16. An indicator to enable Push to Pass will be sent via CAN communication from the timing and scoring beacon on board the Car to the team data logger. This signal must be passed on to the ECU unmodified and uninterrupted during all Road and Street Course Events.

14.18.17. Race Starts and any Race Restart that occurs before the lap prior to the white flag or prior to three minutes remaining in a timed Race Event will have the Push to Pass system disabled and will be enabled for a given Car once that Car reaches the alternate Start/Finish line.

14.19. Data Logging and Telemetry – Chassis and Engine

14.19.1. At any Event where Cosworth Live on Air telemetry is supported or at any Event where point-to-point telemetry is utilized, data must be transmitted via CAN or serial to INDYCAR according to the Cosworth LOA Bulletin:

14.19.2. At all Events, Engine Manufacturers are provided with a pre-Event bulletin with the required ECU software version and parameter values for the locked INDYCAR calibrations. The bulletin is provided no later than forty-eight (48) hours before the start of the practice session one (1) for a given Race Event or Open Test.

14.19.3. At all Events, Engine Manufacturers must log the channels as specified by INDYCAR in the pre-Event bulletin in the ECU on all Cars.

14.20. Fuel

14.20.1. Fuel must be used as supplied by INDYCAR with no modification (e.g. removal or addition).

14.20.2. The addition of any performance-enhancing substance to the fuel, air, or fuel/air mixture is prohibited.

14.20.3. The fuel contained in the Car’s fuel system must not be cooler than five (5) degrees Fahrenheit below ambient temperature.

14.20.4. Fuel allotments are as follows: For Indianapolis 500® Mile Race and Superspeedway Races, the quantity of fuel allotted in the pit tank is equal to 4mpg for the Race distance. The Race distance includes parade and pace laps. For Road/Street Courses/Short Oval Races, the quantity of fuel allotted in the pit tank is equal to 3mpg for the Race distance. The Race distance includes parade and pace laps. For all Races, each Entrant may choose the quantity of fuel in the Car prior to entering Pit Lane for the Race. For all Races, Entrants are not permitted to have their fuel hose hooked up to the Pit Lane tank when the Race allotment of fuel is dispensed into the tank. Entrants are not permitted to hook-up and flood the fuel hose until 1-hour prior to the “Grid the cars” call on the Team Broadcast Frequency.

14.20.5. Prior to Gridding, each Entrant will be permitted to plug in its fuel hose to top off its Car’s fuel tank.

14.20.6. Portable containers are not permitted on Pit Lane.

14.20.7. Fuel may not be stored in the Entrant’s garage.

14.20.8. NFPA (National Fire Protection Association), state and/or local code are a part of the Rules.

14.21. Refueling

14.21.1. The use of the MSE (MS1233) fuel probe sensor and system is mandatory.

14.21.2. All refueling nozzles and refueling receptacles must be returned to the manufacturer for servicing prior to the Entrant’s first Race, Indianapolis 500® Mile Race, and Pocono Race.

14.21.3. During a Race, all refueling must be performed by the INDYCAR-approved dry-break disconnect system. During refueling, only the fuel hose and vent hose can be attached to the fueling system. The fuel flow must be gravity-flow only and the vent hose must not have any evacuation assist devices attached. The refueling coupling must be used as supplied by Red Head Valves - Model VF 1100 M-3 fuel probe with Red Head Valves Model VF 1100 F-3 receiver. All refueling hoses must be used as supplied by the Salem Republic Rubber Company (part #P7310-7F-A1298-030-1050GG). Refueling hoses must have a minimum length of ten (10) feet. Fuel hose supports may not be longer than forty-eight (48) inches and must be approved by INDYCAR prior to use. The inside diameter of all refueling hoses, fittings and connectors shall not exceed three (3) inches.

14.21.4. Only Dallara supplied fuel cell and vent systems may be used.

14.21.5. Entrants may be required to demonstrate the performance of all system parts prior to use. All refueling probes and fuel hoses must be inspected and sealed by INDYCAR before being placed on fuel storage tanks prior to each on-Track Event.

14.21.6. Practice Fueling A single hose with a maximum outside diameter of 1.500 inches incorporating an approved self-closing valve at the tank end must be used. Fuel may only be added through the dry-break vent system. The Engine must be shut off during any practice refueling. A crewmember must operate fire equipment during any refueling.