Section 2: Equipment
The Car
All entries use a common Dallara chassis (the IR-18 generation) built to INDYCAR specification. Teams may not deviate from the homologated design except as permitted by the rulebook.
- Chassis: A carbon-fiber monocoque "survival cell" with front and rear impact-absorbing structures and a closed cockpit protected by the aeroscreen.
- Aero kits: Bodywork is configured for the circuit type — a low-downforce superspeedway kit, a high-downforce road/street and short-oval kit — within INDYCAR's homologated parts list.
- Spec components: Many parts (gearbox internals, dampers within limits, electronics, the data logger) are controlled or standardized to keep the formula close and costs contained.
Powertrain
- Engine: A 2.2-liter twin-turbocharged V6, supplied by one of the series' engine manufacturers (Honda or Chevrolet), built to INDYCAR specification with controlled boost levels.
- Hybrid system: INDYCAR cars run a hybrid energy-recovery unit packaged with the engine; it captures and deploys electrical energy and also provides on-board restart capability.
- Fuel: The series uses a renewable race fuel. Refueling is performed in the pits under controlled procedures.
Tires
- Firestone is the series' tire supplier. Dry tires are provided in a primary compound and a softer alternate compound on road and street courses, and oval-specific constructions for ovals.
- On road and street courses, rules require the use of both dry compounds during the race. Wet-weather tires are provided for road and street events.
- Tire allocations per event are defined in the rulebook and event bulletins.
Driver Safety Equipment
- Helmet and head-and-neck restraint: An approved racing helmet plus a head-and-neck restraint (HANS-type) device are mandatory.
- Fire-resistant gear: Multi-layer fire-resistant suit, underwear, gloves, socks, and shoes meeting motorsport standards.
- Restraint system: A multi-point harness secures the driver in the survival cell; the seat and headrest are fitted to the driver.
- Aeroscreen: A ballistic screen with a titanium frame mounted around the cockpit opening, protecting the driver from debris and impacts while preserving an open-wheel car's character.