Classes

Le Mans Prototypes

A Le Mans prototype is designed especially for endurance racing, primarily for the 24 Hours of Le Mans but also for the World Endurance Championship, the European Le Mans Series, the Asian Le Mans Series and the IMSA WeatherTech SportsCar Championship.  They are built to FIA specifications. Technologically a cut above the rest of the field, prototypes are the stars of endurance racing.

There are two prototype classes:

  • LM P1 - for manufacturers and privateers
  • LM P2 - for privateers only

LM P1 Category

The Le Mans Prototype 1 class has a sub-division:

  • Le Mans Prototype 1 Hybrid with Energy Recovery System (ERS)
  • Le Mans Prototype 1 non-hybrid, with no ERS, for private teams only

Engines

The engine manufacturer is open but the type is restricted to

  • 4 stroke diesel (for LM P1 Hybrid) or petrol piston engine
  • Engine capacity is not restricted

Number panels

Pantone red 485, with white number

Minimum weight

  • 875 kg for LM P1 Hybrids (+ 3 kg for onboard camera equipment)
  • 830 kg for LM P1 (+ 3 kg for onboard camera equipment)

Measurements:

  • Wheelbase: no restrictions but must comply with the measurements declared on the homologation form.
  • Overall length: 4,650 mm maximum
  • Front overhang must not exceed 1,000 mm
  • Rear overhang must not exceed 750 mm
  • Overall width: 1,800 mm minimum to 1,900 mm maximum
  • Height: No part of the bodywork may be more than 1050mm above the reference surface

Equivalence of Technology (EoT)

The endurance committee may take measures to minimise differences between hybrid and non-hybrid cars, for example with the 2017 rules concerning the back aerofoil and weight restriction for non-hybrids.

To restrict hybrid aerodynamic performance, the height of the splitter has been increased and the size of the back diffuser decreased.

Fuel allowance for hybrid cars:

Manufacturers opt for one of four energy recovery system classifications (2, 4, 6 or 8 megajoules). The systems may retrieve mechanical (brakes) or heat-related (exhaust) energy. The fuel allowance depends on the classification chosen.

Tyres:

Tyres for use on a wet track are not restricted in number. However, the allowance for dry weather tyres, or slicks is 28 for the practice sessions and 48 for the race.

LM P2 Category

An LM P2 is purpose-built for racing. The class is open to privateers.

Until 2017 open- or closed-cockpit cars were accepted. However, the regulations introduced on 1 January this year require closed-cockpit designs only. In theory, open-cockpit cars built before the regulations came into force would have been accepted this year, but in practice all entries for 2017 comply with new rules. The selling price of a complete LM P2 is capped at 483,000€.

Dallara, Onroak Automotive (Ligier), Oreca and Riley are the four constructors selected to supply LM P2 chassis. Gibson is sole supplier of engines for the class.

Engines

  • All LM P2 cars are powered by the normally aspirated 4.2-litre V8 Gibson with baseline horsepower of around 600.

Number panels

  • Pantone blue 653, with number in white

Minimum weight

  • 930 kg

Fuel Tank Capacity

  • 75 Litres

Measurements:

  • Wheelbase: no restrictions but must comply with the measurements declared on the homologation form.
  • Overall length: 4,750 mm maximum
  • Front overhang must not exceed 1,000 mm
  • Back overhang must not exceed 750 mm
  • Overall width: 1,900 mm minimum to 1,800 mm maximum
  • Height: No part of the bodywork may be more than 1,050 mm above the reference surface

Tyres

  • Tyre manufacturer may declare up to three dry weather tyre specifications, one wet-weather and one intermediate for LM P2 cars.
  • Tyres for use on a wet track are not restricted in number. However, the allowance for dry-weather tyres is 28 for the practice and qualifying sessions and 56 for the race.

Le Mans Grand Touring Endurance

The Le Mans Grand Tourisme (LM GT) class is for two-door road-legal sports cars with at least two seats. They must have been produced in a series of at least 300 in the previous two years although other rules apply to cars authorised before the current rules introduced in 2016.

LM GTE Pro CategoryLM GTE Am Category

The class has two sub-categories:

  • One aimed at professional drivers (LM GTE Pro)
  • One targeting amateur drivers (LM GTE Am)

The LM GTE Am class only accepts cars that are at least a year old so the 2016 rules will be taking real effect this year.

Engines

  • Naturally aspirated petrol engine: 5,500 cc maximum
  • Turbocharged petrol engine: 4,000 cc maximum

Measurements:

Maximum dimensions:

Maximum measurements for cars accepted from 2016:

  • Front overhang: 1,250 mm
  • Rear overhang: 1,100 mm
  • Overall width: 2,050 mm

Maximum measurements for cars accepted before 2016:

  •  Overall length: 4,800 mm
  •  Front overhang: 1,250 mm
  •  Rear overhang: 1,100 mm
  •  Overall width: 2,050 mm excluding wing mirrors

Number

LM GTE Pro: Pantone green 355, with number in white.
LM GTE Am: Pantone orange 021C, with number in white.

Balance of Performance

The endurance committee reserves the right to adjust performance, based on the lap average statistics, with the fastest car as a reference.

Amendments may affect:

  • minimum weight
  • boost pressure on turbo engines
  • fuel tank capacity
  • height of rear aerofoil
  • or any other element, as deemed necessary by the committee.

Weight

  • 1,245 kg

Fuel Tank Capacity

  • 120 litres for cars accepted from 2016
  • 90 litres for cars accepted before 2016

Tyres

Tyre manufacturers may declare up to three dry weather tyre specifications, which may be different for the Pro and Am categories.

For the amateur class only, the tyre manufacturer may declare one wet-weather and one intermediate specification per model of car.

Tyres for use on a wet track are not restricted in number. However, the allowance for dry weather tyres is 32 for the practice and qualifying sessions and 60 for the race. This rule applies to both LM GTE Pro and Am.