The Dallara IL-15 has been the workhorse of INDY NXT since 2015, and with its arrival in iRacing, sim racers finally have the chance to experience its blend of speed, balance, and technology. Updated in 2021 with the halo device and refined in 2023 with Firestone Firehawks, the IL-15 is as modern as it is approachable.
Here’s the full technical rundown of the car as it appears in iRacing:
| Spec | Detail |
|---|---|
| Horsepower | 450 HP (500 HP w/ Push-to-Pass) |
| Engine Type | 2.0-liter inline-four turbocharged |
| Transmission | 6-speed sequential (paddle shift) |
| Fuel Tank Size | 20 gallons |
| Weight | 1,420 lbs (dry, no driver) |
| Chassis | Carbon fiber tub with bodywork and wings front/rear |
| Suspension | Double wishbone front & rear, pushrod with rocker-actuated inboard dampers |
| Brakes | PFC 6-piston calipers front & rear, iron rotors |
| Wheels | 10″ x 15″ front, 14″ x 15″ rear |
| Tires | Firestone Firehawk: 10.0/23.5 R15 (front), 14.0/24.5 R15 (rear) |
| Dimensions (L x W x H) | 191.5″ x 73.0″ x 45.5″ |
| Wheelbase | 117″ |
The IL-15 offers a true taste of INDYCAR’s feeder series. On road courses, it feels agile and responsive, rewarding smooth steering and quick reflexes. On ovals, the car is stable yet sensitive to aero wash, teaching drivers how to position themselves in packs. The push-to-pass button adds an extra layer of strategy — knowing when to deploy that extra 50 horsepower can mean the difference between winning and finishing second.
It’s approachable, but don’t mistake it for tame: this is a purebred racer that demands focus and finesse.
