HPD ARX-03a LMP1 JRM 2012

HPD ARX-03a JRM '12


Substantial regulation changes, aimed at capping the performance of the prototype racers, effectively promoted the existing LMP2 cars to the top level LMP1 ranks. Among these cars now potentially aiming for outright victories at events like the 24 Hours of Le Mans and the Sebring 12 Hours was the HPD branded and Courage-based ARX-01.

The American based Honda Performance Development took up the challenge and with the help of longtime partner Wirth Research created the ARX-01e. This evolution was sadly only raced once by Highcroft Racing but immediately showed its potential by finishing a surprisingly close second at Sebring. Limited funding prevented further outings and all other HPD customers instead opted to run the newly developed LMP2 version of the ARX-01.

Having relied on existing chassis built many years earlier by ATR for Courage, HPD decided to start off the 2012 season with a clean sheet. Although still based on the tried and trusted design, fresh carbon-fibre monocoques were constructed, labelled ARX-03a (LMP1) and ARX-03b (LMP2). Most of the changes to the chassis focused on relocating the suspension mounting points to better suit the latest tyre developments.

The suspension itself is wholly conventional with double wishbones and push-rod actuated dampers and coil springs on all four corners. Another familiar component is the 3.4 litre V8 complete with direct injection for better performance and mileage. Although no performance figures have been released, it is believed the naturally aspirated engine produces over 500 bhp. This is mated to a HPD modified Hewland six-speed sequential gearbox.

Like all other HPD Le Mans Prototypes, the ARX-03 still boasts an open cockpit whereas most other LMP1 cars are now coupes. The actual aerodynamics package is a further development of the ARX-01e and the earlier ARX-02. Accordingly, it is fitted with relatively wide front tyres and suitably large front fenders. A significant change for 2012 was the addition of the mandatory fin on the rear deck and large holes on top of the fenders.

No fewer than three teams opted to run the ARX-03a in 2012 with Muscle Milk Picket Racing competing in the American Le Mans Series (ALMS), while Strakka Racing and JRM opting to field the LMP1 HPD in the new FIA World Endurance Championship (WEC).

JRM would debut their LMP1 at the 2012 12 Hours of Sebring, finishing third in class position. At Le Mans, JRM finished second in the LMP1-L class and sixth overall behind Rebellion Racing. With four class podiums, the team would finish third in the LMP1 Privateer Trophy behind Strakka Racing and Rebellion Racing.

Text extracted from Ultimatecarpage.com (ultimatecarpage.com)



• Manufacturer: Honda Performance Development
• Team: JRM
• Country: United States
• Series: FIA World Endurance Championship
• Class: LMP1
• Year: 2012
• Type: Race car
• Division: Gr.1
• Tags: #Racing car, #Le Mans, #Midship

• Engine: Honda AR6-LM 90º V8
• Power: Over 520 HP / --- rpm
• Torque: --- Nm / --- rpm
• Engine location: Mid
• Displacement: 3397 cc
• Construction: Aluminium block and head
• Valvetrain: 4 valves / cylinder, DOHC
• Aspiration: Naturally Aspirated (NA)
• Lubrication: Dry sump

• 0-100 km/h (0-62 mph) Time: Unknown
• Top Speed: Unknown
• Power-to-weight ratio: >0.58 hp/kg

• Layout: MR
• Drive: Rear wheel drive
• Chassis: Carbon fibre monocoque
• Gearbox: HPD-Hewland 6 sequential
• Suspension: Double wishbone with adjustable toe, camber, ride heights. Four-way damber units with separate coil springs, pushrods with anti-roll bars

• Lenght: --- mm
• Width: --- mm
• Height: --- mm
• Weight: 900 kg

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