Dallara IR-03

Dallara IR-03/04/05^[1]
Dallara IR-05^[2]
Category	IndyCar Series
Constructor	Dallara
Predecessor	Dallara IR-02
Successor	Dallara DW12
Technical specifications
Chassis	Carbon fiber monocoque with honeycomb structure
Suspension (front)	double wishbones, pull rod actuated coil springs over shock absorbers
Suspension (rear)	double wishbones, pull rod actuated coil springs over shock absorbers
Length	192–196 in (4,877–4,978 mm)
Width	77.5–78.5 in (1,968–1,994 mm) minimum (Road/Street)
Wheelbase	118–122 in (2,997–3,099 mm)
Engine	Chevrolet Indy V8 (2003-2005), Honda Indy V8 (2003-2011) Toyota Indy V8 (2003-2005) 3.0–3.5 L (183–214 cu in) 90° N/A V8 with 4-stroke piston Otto cycle mid-engined, longitudinally-mounted
Transmission	Xtrac #P295 6-speed sequential (2003-2008) later sequential semi-automatic paddle-shift (2008-2011) + no reverse (2003-2009), later 1 reverse (must have reverse only for road/street courses; 2010-2011)
Power	~ 650 hp (485 kW) (2003-2008); 650 hp (485 kW) + 20 hp (15 kW) on push-to-pass (2009); 650 hp (485 kW) + 40 hp (30 kW) on push-to-pass
Weight	1,525–1,565 lb (692–710 kg) on ovals; 1,600–1,640 lb (726–744 kg) (road and street courses)
Fuel	100% methanol (2003-2005) ; EPIC 10% ethanol + 90% methanol (2006) ; EPIC 98% ethanol + 2% gasoline (2007-2009) ; Sunoco 98% ethanol + 2% gasoline (2010-2011)
Lubricants	Various per teams
Tyres	Firestone Firehawk
Competition history
Debut	2003 Toyota Indy 300

The Dallara IR-03, and its evolution, the Dallara IR-04/05, is an open-wheel formula racing car developed and produced by Italian manufacturer Dallara for use in the IndyCar Series, between 2003 and 2011.^[8]^[9]

Starting from 2007 season, all IndyCar Series entrants (outside the Indy 500) utilized the IR-05 chassis version after Panoz defected to Champ Car World Series to replace Lola as the spec chassis supplier for that series in the same season. In 2009 one year after IndyCar unified with Champ Car all entrants (including entrants for the Indy 500) used the IR-05 making it the only chassis used in IndyCar from 2009 to 2011.