Dallara DW12
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| Category | IndyCar Series | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Constructor | Dallara | ||||||||
| Designer(s) | Luca Pignacca Sam Garrett Andrea Toso |
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| Predecessor | Dallara IR-05 | ||||||||
| Technical specifications | |||||||||
| 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 | 5,012.3 mm (197 in) | ||||||||
| Width | 2,011 mm (79 in) | ||||||||
| Height | 1,127.9 mm (44 in) | ||||||||
| Axle track | Max. 1,940 mm (76 in) | ||||||||
| Wheelbase | 2,997.2–3,073.4 mm (118–121 in) | ||||||||
| Engine |
Chevrolet Indy V6 Honda HI16TT 2.2 L (2,200 cc; 134 cu in) V6 90° twin-turbocharged, mid-engined, longitudinally-mounted |
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| Transmission | Xtrac 1011 6-speed sequential semi-automatic paddle shift + 1 reverse | ||||||||
| 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 |
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| Weight | 1,545 lb (701 kg) on 1.5-mile speedways and Indianapolis 500 1,575 lb (714 kg) on short ovals, road and street courses but excluding 185 lbs driver equivalency weight or fuel |
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| Fuel | Sunoco E85 Ethanol + 15% gasoline | ||||||||
| Lubricants |
Pennzoil Ultra Shell Helix PEAK Motor Oil Valvoline Castrol |
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| Brakes | Brembo carbon discs and pads. Brembo 4-piston (all oval races)/6-piston (road/street course races) calipers | ||||||||
| Tyres |
Firestone Firehawk O.Z. racing and BBS wheels |
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| Competition history | |||||||||
| Notable entrants | All IndyCar Series teams | ||||||||
| Notable drivers | All IndyCar Series drivers | ||||||||
| Debut | 2012 Honda Grand Prix of St. Petersburg | ||||||||
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| Constructors' Championships | 5 | ||||||||
| Drivers' Championships | 5 | ||||||||
The Dallara DW12 is a formula racing car developed and produced by Italian manufacturer Dallara for use in the IndyCar Series. Officially designated as IR12, it was developed for use in the 2012 IndyCar Series season, replacing the aging Dallara IR5 chassis and would be used for the next six seasons until its successor is introduced in 2021 due to the series' philosophy of upgrading its chassis every nine years since 2012. The DW12 was introduced after the 2011 IZOD IndyCar World Championship. The chassis is named after Dan Wheldon, who was killed at Las Vegas Motor Speedway on October 16, 2011.
Starting in 2012 the series moved to using a common chassis supplied by Dallara. Using a single supplier to supply chassis was introduced as a cost control method, and IndyCar has negotiated a fixed cost of $349,000 per chassis. The new specification of chassis also improved safety, the most obvious feature being the partial enclosure around the rear wheels.
This chassis is intended to support multiple aerodynamic kits, but the introduction of these was delayed until 2015, with Honda and Chevrolet supplying the alternatives to the Dallara package.
On 18 October, Italian manufacturer Dallara confirmed that the 2012 series car would be named after the late IndyCar driver Dan Wheldon (DW12) in honour of his work testing the car before his death two days prior at Las Vegas, with the new bumper/nerf bar section being featured, it was designed to prevent many similar single-seater crashes such as the one that killed Wheldon. The nomenclature is similar to that of the old Formula One team Ligier, whose cars were labeled JSxx in memory of French F1 driver Jo Schlesser after his death at the 1968 French Grand Prix.
Dallara cars have won twelve of the sixteen Indianapolis 500s they have contested. In 2013, Dallara reached its milestone 200th Indy car victory at Barber.
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