First Look At LMDh Technical Regulations

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Kamui Kobayashi put the Wayne Taylor Racing entry on the top of the speed charts during the final Rolex 24 practice. (IMSA Photo)
The first look at the new regulations for the upcoming LMDh car have been released by IMSA and WEC officials. (IMSA Photo)

LE MANS, France – The first details of the joint draft technical regulations for Le Mans Daytona h (LMDh), which will be eligible for the top category of international sports car racing in both the FIA World Endurance Championship (WEC) and the IMSA WeatherTech SportsCar Championship, were released last week to interested automotive manufacturers and chassis constructors.

The regulations are the result of many months of collaborative work by the technical departments of the Automobile Club de l’Ouest and the International Motor Sports Ass’n, together with more than a dozen automotive manufacturers and the four nominated chassis constructors (Dallara, Ligier, Multimatic and Oreca).

Following a joint press conference at Daytona Int’l Speedway in January announcing plans for convergence, a full detailed public presentation of the technical regulations was originally intended to be held in March at Sebring, but was postponed due to the COVID-19 pandemic.

In the meantime, the presentation was made to interested automotive manufacturers and chassis constructors last week using WebEx remote group presentation software technology.

“Officially launched in Daytona in January, the ACO-IMSA convergence is now entering an important phase in its implementation,” said Pierre Fillon, president of the ACO. “We are unveiling the basic technical details of this new LMDh category which will the same car being allowed to race in the FIA ​​World Endurance Championship and the IMSA WeatherTech SportsCar Championship, without any modification necessary to the car. The dream of many manufacturers is finally coming true. Le Mans Daytona h and Le Mans Hypercar will embody the top category of endurance racing. This is a historic and decisive moment for the future of our discipline.”

“We have reached another key milestone with the release of our draft technical regulations for LMDh,” said IMSA CEO Ed Bennett. “There is still more work to be done, but the positive spirit of collaboration between the ACO and IMSA, as well as our four constructors and many interested manufacturers has been fantastic and truly unprecedented. These regulations provide a roadmap for manufacturers and constructors to embark on the design process for new LMDh race cars that will revolutionize the top category of premier sports car racing around the globe.”

The global description of the LMDh platform will correspond to the following points:

LMDh is a common car created by ACO-IMSA and able to race in both WEC and IMSA
LMDh based on a cost-capped car and will have the same spine (spine = complete car without bodywork, engine, hybrid) as the next generation of Le Mans Prototype 2 (LMP2)
Only mainstream automotive manufacturers (associated with one of the four chassis constructors) can homologate a LMDh car

The cars will feature:
– A manufacturer branded and stylized bodywork
– A manufacturer branded engine
– A common single source rear wheel drive hybrid system
– A minimum homologation period of five (5) years

The basis of the joint regulations to govern the new LMDh category is comprised of the following points:

– Minimum car weight at 1030 kg
– 500 kW peak of combined power (sum of power resulting from internal combustion engine (ICE) and hybrid system)
– One bodywork package with identical aerodynamic performance
– Single tire supplier (i.e. Michelin)
– Global BOP to harmonize the overall performance of the LMDh and LMH cars

It is intended that the top category of competition for the WEC, which has the 24 Hours of Le Mans as its cornerstone event, will integrate Le Mans Daytona h with Le Mans Hypercar race cars to ensure convergence leads to similar car performance parameters for both technical rule sets.

Meanwhile, IMSA, with the Rolex 24 At Daytona as its premier event, will welcome LMDh cars while being open to LMH participation from mainstream automotive manufacturers once performance at IMSA circuits can be further validated.

The introduction of LMDh race cars continues to be targeted in the 2022 racing season for both the ACO and IMSA. However, this timeline will need to be further validated in partnership with the automotive manufacturers, chassis constructors and key suppliers in light of the COVID-19 pandemic to determine if a delayed introduction becomes necessary.

Final regulations are anticipated to be released on or before the 24 Hours of Le Mans in September 2020.