The Dallara IL-15 is one of the Dallara entries the open record knows by name, and by little else. That is not nothing: a name in the catalogue is where a car's story starts to be recoverable.
The background
The Dallara IL-15 is an open-wheel formula racing car chassis, designed, developed and built by Dallara. Since 2015, it has been the spec-chassis for the one-make Indy NXT, a feeder series for the IndyCar Series.
The engineering
the output is 450 hp + 50 hp on push-to-pass. On the scales it comes to 1400.0 lb. That is roughly 321 horsepower per tonne: genuine supercar pace. These are manufacturer figures carried by Wikipedia and Wikidata, not road-test measurements.
Where it sits
In the Dallara line-up the Dallara IL-15 has a clear place: it replaced the Dallara IPS. Its Dallara stablemates include the Dallara 320 and the Dallara F191.