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Le Mans Prototypes

Le Mans Prototypes are either open or closed cockpit cars with no production minimum required. Generally produced specially for the 24 Hours of Le Mans, but also for FIA WEC Endurance Championship / ELMS / IMSA races, these cars are developed exclusively for on-track competitions, fulfilling the requirements of the Automobile Club de l’Ouest’s technical regulations. Because of their superior performances and level of technological development, they have a star status within Endurance Racing.

Prototypes are divided into two categories:

  • LMP1 - for Manufacturers
  • LMP2 - for teams independent of manufacturers and/or engine suppliers




"LE MANS" PROTOTYPE 1 category includes:

  • "LE MANS" PROTOTYPE 1 Hybrid: with Energy Recovery System (ERS).
  • "LE MANS" PROTOTYPE 1 : with no Energy Recovery System (ERS) reserved only for privateers.

The LMP1 Private Teams category is reserved exclusively for independent private teams. A team that is independent of a manufacturer means a team that does not benefit from any support from a manufacturer other than for the single supply of engines, services relating to these engines or commercial support. Any support from a manufacturer relating to the chassis or to chassis systems is prohibited. It is understood that traction control is considered as a chassis system.


Engine is free except following restrictions:

  • Only Petrol or Diesel 4 stroke engines with reciprocating pistons are permitted.
  • Engine cubic capacity is free for "LM" P1-Hybrid cars
  • Engine cubic capacity must not exceed 5500 cm3 for "LM" P1 cars.

Number panels

Pantone red 485, with white numbers

Driver Categories

Bronze drivers are not permitted


Minimum weight

875 kg for LMP1-Hybrid
855 kg for LMP1



  • Wheelbase: Free but it must be identical to that registered in the Homologation Form
  • Overall length: 4650 mm maximum
  • The front overhang is limited to 1000 mm
  • The rear overhang is limited to 750 mm
  • Overall width: 1900 mm maximum and 1800mm minimum
  • Height: No part of the bodywork is permitted to be more than 1050 mm above the reference surface

Fuel Flow Metering:

A homologated "Fuel Flow Meters" sensor must be fitted which directly measures the fuel flow through the fuel feed line to the engine. By measuring the instantaneous flow the total fuel consumption can be calculated. The LMP1 will be constrained on both: fuel energy per lap and maximum instantaneous fuel flow.

Fuel Tank Capacity:

Petrol 62.5 litres with ERS, 67.4 litres with no ERS
Diesel 49.9 litres with ERS, 53.7 litres with no ERS

Fuel Energy per Lap:

The fuel energy per lap is the total amount of fuel energy contained in the fuel mass allocated for one lap.

Technology Factor:

The Fuel Technology Factor is a function of the ratio of Diesel over Petrol engine efficiencies.
The K Technology Factor is a function of Diesel and Gasoline powertrain weight and ERS options.
Those factors are used to calculate the relation between diesel and gasoline allocated energy and maximum instantaneous flow.

Maximum instantaneous fluel flow:

The fuel flow is limited instantaneously and therefore limits the maximumengine power.



"LE MANS" PROTOTYPE 2 ("LM" P2) is a racing car with no production minimum required.
It is an open or closed car, destined only to teams independent of manufacturers and/or engine suppliers.

The selling price of the complete new open cockpit car, without the engine, as described in Article 5.6.1 but with all available options must not exceed €388.500. For closed cars, the selling price must not exceed €463.500.



Engine Homologated (see Article 5.6)

Maximum cylinder capacity:

  • Normally aspirated petrol: 5000cc 8 cylinders maximum
  • Turbo/ supercharged petrol: 3200cc 6 cylinders maximum

Number panels

Pantone blue 653, with white numbers.

Driver Categories

A crew of 2 or 3 drivers must include at least one Silver or Bronze driver.


Minimum weight

900 kg
The minimum weight includes the skid block
defined in Article 3.5.6.

Fuel Tank Capacity

75 Litres



  • Wheelbase: Free but it must be identical to that registered in the Homologation Form.
  • Overall length: 4650 mm maximum (rear wing included)
  • Overall width: 2000 mm maximum
  • Height: No part of the bodywork is permitted to be more than 1030 mm (*) above the reference surface (See Article 3.5.1), except the rear rollover structure fairing that may be 10 mm maximum above the rear rollover structure.
    (*) 1050 mm for LMP2 equipped with a chassis in compliance with the 2016 LMP1 regulations.
  • The front overhang is limited to 1000 mm.
  • The rear overhang is limited to 750 mm (including the rear wing).

Le Mans Grand Touring Endurance

The "Le Mans" Grand Touring Endurance car ("LM" GTE) is a car having an aptitude for sport with 2 doors, 2 or 2+2 seats, opened or closed, which can be used perfectly legally on the open road and available for sale thanks to the dealer network of a manufacturer recognised by the Endurance Committee.

This category includes two groups:

  • A group destined more especially to professional (LMGTE-PRO).
  • A group destined more specially to amateurs drivers (LMGTE-AM).

In this group only cars at least-one year old or fully in compliance with the specifications of the previous year car - unless specified in these regulations - will be admitted.




Normally aspirated engines: 5500 cc maximum
Turbocharged / Supercharged engines: 4000 cc maximum.

Driver categories

LMGTE-Pro: The composition of the crews is free.
LMGTE-Am: A crew of 2 or 3 drivers must include at least 1 Bronze plus 1 Bronze or Silver LMP1.


Maximum dimensions:

  • Overall length: 4800 mm
  • Front overhang: 1250 mm
  • Rear overhang: 1100 mm
  • Overall width: 2050 mm (excluding rear view mirrors)



Number panels

LMGTE-Pro: Pantone green 355, with white numbers.
LMGTE-Am: Pantone orange 021C, with white numbers.

Minimum weight

1245 kg (weight of the car without driver, fuel or fluids on board). The Endurance Committee reserves the right to adjust the minimum weight of any car in order to maintain the Balance of Performance between the cars.

Fuel Tank Capacity

90 litres (subject to FIA ajustments)

summary of categories