Dallara DW12

Dallara DW12

Josef Newgarden and Takuma Sato driving DW12s at the 2021 Indianapolis 500
Category	IndyCar Series
Constructor	Dallara
Designer(s)	Tony Cotman Luca Pignacca Sam Garrett Andrea Toso
Predecessor	Dallara IR-05
Successor	Dallara IR-27
Technical specifications[1]
Chassis	Carbon fiber monocoque with honeycomb kevlar structure
Suspension (front)	Double A-arm, pushrod, with third spring and anti-roll bar
Suspension (rear)	As front
Length	201.7 in (5,123 mm) on road/street course, short ovals; 197.33 in (5,012 mm) on 1.5-mile intermediate ovals, superspeedways and Indianapolis 500 (Mk. III)
Width	75.5 in (1,918 mm) minimum (Road/Street), 75.75 in (1,924 mm) minimum (Ovals), 76.5 in (1,943 mm) maximum (measured outside rim to rim)
Height	40 in (1,016 mm)
Axle track	Max. 76.3 in (1,938 mm)
Wheelbase	117.5–121.5 in (2,984–3,086 mm) adjustable
Engine	Chevrolet Indy V6 (2012-present), Honda HI24TT (2012-present) and Lotus Indy V6 (2012) 2.2 L (134 cu in) V6 90° with 4-stroke piston Otto cycle with efficient combustion process and greater emission engine burning single (Honda in 2012-2013)/twin-turbocharged (supplied by BorgWarner), mid-engined, longitudinally-mounted
Transmission	Xtrac #1011 6-speed AGS (Assisted Gearchange System)[2] sequential semi-automatic paddle-shift + 1 reverse
Battery	Braille ML7Ti 12 volts
Power	575 hp (429 kW) on speedways, 625 hp (466 kW) on 1.5-mile ovals, 675 hp (503 kW) on short ovals and road/street courses + 60 hp (45 kW) on push-to-pass
Weight	1,650 lb (748 kg) on 1.5-mile speedways, superspeedways and Indianapolis 500; 1,680 lb (762 kg) on short ovals; 1,690 lb (767 kg) road and street courses (including additional of aeroscreen)[3]
Fuel	E85 (85% ethanol + 15% gasoline) (2012-2022): Sunoco (2012-2018) Speedway (2019-2022) 100% renewable E85 (85% ethanol + 15% biofuel): Shell (2023-)[4]
Lubricants	Pennzoil (rest of IndyCar Series teams), Ridgeline Lubricants (Chip Ganassi Racing) and Lucas Oil (Arrow McLaren)
Brakes	Brembo (2012-2016) later PFC (2017-present) carbon discs and pads. Brembo (2012-2017) later PFC ZR90 (2018-present) 4-piston (all oval races)/6-piston (road/street course races) calipers
Tyres	Firestone Firehawk dry slick and treaded wet tires O.Z. Racing and BBS wheels
Clutch	AP Racing CP8153-DE03-SN 3-plate carbon with steel housing
Competition history
Notable entrants	All IndyCar Series Teams
Notable drivers	All IndyCar Series Drivers
Debut	2012 Honda Grand Prix of St. Petersburg

The Dallara DW12 (formally named the Dallara IR-12) is an open-wheel formula racing car developed and produced by Italian manufacturer Dallara for use in the IndyCar Series. It replaced the aging Dallara IR-05 chassis in the 2012 IndyCar Series season and is to be used through the 2026 season, after which it is to be replaced by the planned Dallara IR-27.^{[5][6][7][8][9]}

Since 2012, all IndyCar races are contested with cars built on a common chassis supplied by Dallara,^[10] keeping costs to the fixed $349,000 per chassis negotiated by the IndyCar organization.^[11] The new specification of chassis also adds safety features, the most prominent being a partial enclosure around the rear wheels. Since 2015, Honda and Chevrolet have offered alternatives to the Dallara aerodynamic kit for the chassis.^[12]

The chassis is named after Dan Wheldon, who was the car's test driver, and who was killed at Las Vegas Motor Speedway on October 16, 2011, the final race of the previous IR-05.^[13] The new front section is designed to prevent similar single-seater crashes such as the one that killed Wheldon.^[14] The nomenclature recalls that of the old Formula One team Ligier, whose cars were labeled JSxx after French F1 driver Jo Schlesser, who died in the 1968 French Grand Prix.