The IndyCar IR‑28 chassis made its inaugural on‑track debut at Indianapolis Motor Speedway’s road course, signaling an end to the DW‑12 era that has dominated the series since 2012.
First‑Day Laps Led by Indianapolis 500 Champion
On Saturday, Ed Carpenter Racing’s Alexander Rossi—the 2016 Indianapolis 500 winner—sketched the new platform’s potential, followed by Chip Ganassi’s Alex Palou on Sunday. Both drivers tackled the 2.439‑mile, 14‑turn circuit to gauge aerodynamic and mechanical performance.
Clean‑Sheet Design for Higher Speed and Safety
Instead of aging the existing chassis, IndyCar tapped Dallara to build a fresh monocoque. The result is a lighter frame that drops about 100 lb while doubling the engine’s displacement to 2.4 litres. A hybrid unit with fourteen‑fold more energy storage and 20 lb lighter than the DW‑12’s system rounds out the powertrain package. The design team emphasised that record‑low lap times could be achieved without compromising safety, a requirement that underpins all development decisions.
Incremental Test Phases and Future Rollout
The initial “mule” car has a stock engine and 3‑D‑printed components, allowing engineers to validate mechanicals, aerodynamics, and driver ergonomics. Mike O’Gara, the race‑engineering VP, will steer the assembly of key elements and ensure that each milestone aligns with the program’s schedule. Stage two will swap in OEM engines without hybrid boost, confirming performance expectations. Full hybrid operation will be tackled in phase three.
- Full‑scale production starts after October testing ends.
- Engine and hybrid systems will be shipped to teams from late 2026 or early 2027.
- Official deliveries of a single car per entry will begin immediately after the 2027 season finale.
Aero Innovations for Improved Passing
To enhance on‑point racing, Dallara integrated “tire wake conditioners” (TWC) behind the front wheels to disrupt mist‑like turbulence that hampers trailing crews. Anti‑lift features also reside in the bodywork itself, negating the need for external add‑ons. Simulations using virtual lead cars guided the design before physical testing, ensuring that the IR‑28 will permit mid‑pack overtakes on high‑speed ovals like IMS.
Driver‑Centric Safety and Comfort Enhancements
IndyCar and Dallara widened the cockpit to enable greater padding and accommodate drivers with varied body types. Adjustable pedals and steering columns preserve helmet‑within‑field safety positions while allowing seat‑free adjustments. Cooling systems have been internalised: nose, radiator ducts, shock cover and a bottom “keel” vent now guide airflow, eliminating drag‑producing external scoops. Actuators in wheel‑mounted anti‑roll bars free cockpit space and reduce injury risk.
Mechanical Grip and Cost‑Control Measures
A single‑supplier damper‑inerter package, sourced from Custom Access, brings Formula 1‑level adjustability to IndyCar. The system’s six‑element inertial system lets teams fine‑tune mechanical grip without expensive bespoke upgrades. Early‑phase development will be tightly regulated: teams are expected to run the chassis “as delivered” for the first year, with future tweaks spread over multiple seasons to spread capital outlay.
Long‑Term Strategy: Modular Upgrades and Fresh Aero
From day one, the IR‑28 will support increased power and downforce, featuring reinforced suspension and wheel designs. Future brake‑by‑wire modules and electric steering assist are pre‑wired into the chassis. IndyCar foresees a three‑year visual and aerodynamic cycle, with a shorter monocoque lifespan than the DW‑12. These steps aim to keep the series appealing to fans, attract new OEMs, and sustain technological evolution while managing costs.
With the first laps already behind hands, teams and fans can look forward to a racing package that balances speed, safety and competition more tightly than any IndyCar chassis before it.
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