Thierry Bouvet - Understanding Equivalence of Technology

Thierry Bouvet - Understanding Equivalence of Technology

30.05.2018: With the Le Mans 24 Hours Test Day fast approaching, ACO Technical Delegate Thierry Bouvet explains what’s what when it comes to Equivalence of Technology (EoT).

With the Le Mans 24 Hours Test Day fast approaching, ACO Technical Delegate Thierry Bouvet explains what’s what when it comes to Equivalence of Technology (EoT).

 The rule is the result of many discussions between the ACO, the FIA, and LMP1 chassis and engine constructors.

Can you explain the difference between Balance of Performance (BoP) and EoT? 

Balance of Performance applies to the LMGTE class and is intended to encourage parity between sports cars with different technical features (front vs rear engine, for example). To ensure competition is as fair as possible, race organisers seek convergence in terms of aerodynamics first and then consider weight, output and fuel tank capacity.

EoT has been introduced now that hybrid and non-hybrid cars are in direct competition in LMP1, to ensure a level playing field in the top class.

 Toyota being the only manufacturer entering a hybrid car (classed as LMP1-H) for the 2018-19 FIA World Endurance Championship Super Season, the factory’s competitors are private teams using non-hybrid technology (LMP1-NH).

EoT is designed to ensure that the new contenders can compete with the Toyota TS050 Hybrid fielded by the manufacturer since 2016.

What principles are EoT based on?

We devised an EoT in 2014, with the FIA, to create parity between petrol and diesel cars. The adjustments were based on fuel allocation (flow rate and allowance per lap), which influences performance and range. A flow metre and sensors are vital in measuring this.

Today, given that the regulations are different for hybrid (LMP1-H) and non-hybrid (LMP1-NH) cars – particularly concerning aerodynamics and weight – and that there are even differences according to engine types in the non-hybrid entries, we have again opted for an EoT.

How did you go about it?

Last winter, we set up a working group of members of the FIA, the ACO and LMP1 engine and chassis constructors to define the outline. We had all the data on the Toyota TS050 Hybrid prototype.

 The non-hybrids were at the production stage, so the constructors supplied simulations, which obviously meant that changes to the EoT could not be ruled out. Everyone was aware of that.

The WEC Prologue and the first round at Spa provided precious feedback. Bearing in mind that the non-hybrids are still in the development phase and therefore have plenty of potential for improvement, we have already made some alterations.

Our role is to ensure fair competition. The allowances for non-hybrids are intended to make up for a handicap compared to a hybrid car, not to give them an unfair advantage. It’s a balancing act, but there are means. In the same way, hybrid technology must remain relevant. At Le Mans, a hybrid does a lap more per stint than a non-hybrid.

With the Test Day only days away, EoT is still under debate. The balance between the naturally-aspirated and turbo engines has been criticised, for example.

When we examined the situation in 2017, we decided not to differentiate between the two because there are many parameters to consider beyond output. Turbo engines have heavier components and need a cold air intake system, and fuel consumption can differ too.

 All of that affects the car’s performance (weight distribution, drag, etc.). Once we had analysed the data we obtained at the Prologue and Spa, we drew our conclusions and made the relevant adjustments to EoT for Le Mans.

At Spa, the Toyota was faster than the LMP1-NH by a second per lap. For the Test Day on 3 June, you have reduced the fuel-flow for non-hybrids to 108 kg/h rather than the 110 kg/h with which they raced at Spa. The flow for the hybrid remains at 80 kg/h. Why?

When the EoT was created for the 2014 championship, to keep consistency of the hybrid usage with the other car systems, the hybrid coefficient was multiplied by 55% per kilometre at the shorter circuits compared with Le Mans (where the long straights alter the balance). That rule therefore applied at Spa.

Relative performance of hybrids and non-hybrids differs between Spa and Le Mans. Hybrids are at a relative disadvantage at Le Mans.

We used the data collected during the first two outings to adjust EoT for Le Mans and to close the gap between private and factory teams.  Again, between Spa and Le Mans Test Day, the privateers will have progressed. The ACO and FIA specialists will continue analysing data during and after the Test Day.

Some non-hybrid competitors are worried they’ll have to hold back.

Fuel consumption per lap is a real restriction. It’s difficult to manage if left to the driver. That’s why factories have developed automatic solutions. Encouraging privateers to do the same would involve pointless expense.

That’s why the EoT that will apply on Test Day does not specify consumption per lap or per stint. So, there is no reason for drivers of non-hybrids to hold back. All the data collected during Test Day will be analysed by the FIA and the ACO and published for Race Week.


2018 LE MANS 24 HOURS 86th event
2nd round of the 2018/2019 FIA World Endurance Championship

•    Dates: 16 - 17 June 2018

•    General enclosure tickets: 61.50 euros (ACO members) instead of 82 euros (non ACO members).

Free for young people born after 17th June 2002 accompanied by an adult.

•    Test Day: 3rd June 2018

•    Start of the 86th Le Mans 24 Hours: Saturday 16th June at 15:00

- ACO also photo


30.05.2018 / MaP

More News

24h Le Mans - Fun for the whole family from 10-17 June
In addition to the race spectators can enjoy a week of activities from Sunday 10th to Sunday 17th June. A raft of festive, convivial events will take place in addition to the race  throughout more >>
Keating Motorsports/Risi Competizione 24h Le Mans test day preview
Risi Competizione Ferrari 488 GTE-Am No. 85:    Ben Keating (USA)                                                  &nb more >>
Calling all football and Le Mans 24 Hours fans
Torn between supporting your team and watching Le Mans 24 Hours? Don’t worry! You can do both.You won’t miss any of the action, either on the pitch or on the track. You can even help the French crowd cheer on Les Bleus before the start of the more >>
Circuit des 24 Heures du Mans : Everyone’s a winner with the changes to the circuit
The perpetually evolving Circuit des 24 Heures du Mans has a makeover every year ahead of the world’s greatest endurance race. Conducted under the aegis of the Syndicat mixte des 24 Heures – a consortium of local authorities – and the Automob more >>
List of teams invited to present cars and drivers for 24h Le Mans
....for scrutineering and administrative checksWith only 30 days to go before the 86th 24 Hours of Le Mans, the Automobile Club de l’Ouest is delighted to announce the list of competitors requested to undergo the mandatory pre-race checks on 10 and 11 more >>
Jamiroquai to play in the grounds of the 24 Hours of Le Mans !
 The Automobile Club de l’Ouest and its partner, Le Mans Stadium, organisers of the special concert initially scheduled for the MMArena, have decided to move the show to the very heart of the circuit and the stage near the Dunlop bridge on Friday 15 June. A real bonus for fans at the 24 Hours of Le Mans! more >>
Rafael Nadal to kick off the 2018 24 Hours of Le Mans!
World-renowned tennis champion Rafael Nadal is to be race starter for the 86th 24 Hours of Le Mans on Saturday 16 June 2018. The phenomenal sportsman is a fitting ambassador for the iconic race. Make sure you’re watching at 3 p.m. on 16 June!Nadal often visi more >>
BMW returns to Le Mans – with the world premiere of the new BMW 8 Series Coupe.
New luxury sports car to be presented for the first time on 15 June 2018, the eve of the legendary 24-hour race – parallel development of the production model and the BMW M8 GTE guarantees inspiring driving dynamics on the road as well.24 hours more >>
JACKY ICKX, Grand Marshal of the 24 Hours of Le Mans 2018
With five weeks to go before this year’s 24 Hours of Le Mans, fans will be delighted to hear that the Grand Marshal of the world’s greatest endurance race is none other than the original Mr Le Mans, Jacky Ickx. more >>
BMW Motorsport returns to the 24 Hours of Le Mans with Panasonic as “Official Partner”.
As BMW Motorsport returns to the 24 Hours of Le Mans (FRA) and enters the FIA World Endurance Championship (WEC), they are looking forward to a new partner that is renowned around the worldPanasonic enters the newly formed Super Season 2 more >>
24 Heures du Mans -Another world champion joins the race !
2009 Formula 1 World Champion Jenson Button has been announced as the latest driver to take on the challenge of the FIA World Endurance Championship and top tier sports prototype racing.The British driver will race for the full Super Season (except Spa 20 more >>
2018 Road to Le Mans, back for a third year with an even bigger grid!
After two highly successful editions, Road to Le Mans is back as a support race to the 86th 24 Hours of Le Mans on 16 June 2018. ENTRY LIST HERE   more >>
Porsche provide ACO and WEC with fleet of official course cars
•    New exclusive deal with WEC•    Porsche 911 Turbo to be Safety CarThe Porsche name is synonymous with endurance racing as one of the most successful and enduring marques, winning the 24 Hours of more >>
Paul di Resta to make 24h Le Mans debut with United Autosports
•    Paul Di Resta to race at Le Mans for the first time in June•    DTM Champion to race alongside Phil Hanson and Filipe Albuquerque•    Two car LMP2 entry for Anglo American team more >>
Juan Pablo Montoya to join United Autosports for 24 Hours Le Mans
•    Former F1 race winner to join United Autosports for 24 Hours of Le Mans•    Colombian to make Le Mans debut alongside Will Owen and Hugo de Sadeleer•    Triple Crown of Motorsport in sight for Monaco GP and Indy 500 winner more >>
Le Mans 24 Hours - a single ticket for THE concert and THE race!
2018 Le Mans 24 Hours 15-16-17 June 2018A major novelty in this year’s Le Mans 24-Hours week is the big Le Mans 24 Hours concert co-produced by the ACO and the Le Mans Stadium and sponsored by MMA, which will take place on 15th more >>
Marcel Martin has passed away
The Automobile Club is in mourning for one of its most steadfast members Marcel Martin, a passionate motor sport fan and renowned Le Mans 24-Hours race director, who has passed away at the age of 88.“Long live the Le Mans 24 Hou more >>
An innovation at the start on the Le Mans 24-Hours circuit
Every year the Le Mans 24-Hours circuit undergoes evolutions, further development and maintenance works. After the recent works aimed at making the Porsche corners safer and improving the sanitation under the track, 2018 will see a major innovation as the start line will be moved more >>
Ben Keating announces third driver for Risi Competizione /Keating Motorsport 24h Le Mans entry
Risi Competizione and Keating Motorsport announced at this year's Rolex 24 At Daytona that they would partner for Keating's GTE-Am entry in the 86th running of the 24 Hours of Le Mans. Keating and long-time co-driver, Dutchman Jeroen Bleekemolen, were announced as the two drivers.  more >>
9 Ligier JS P217s will race in the 2018 Le Mans 24 Hours
The lists of teams which will race in this year’s Le Mans 24 Hours, the FIA World Endurance Championship and the European Le Mans Series have been unveiled. A total of 10 Ligier JS P217s and 15 Ligier JS P3s will race in these three events.The more >>
24h Le Mans List of Competitors invited
2018 Le Mans 24 Hours - Looking forward to 16 June 2018!
•    Fernando Alonso and Toyota up against five private teams in the top LM P1 class;•    A 20-strong LM P2 grid;•    Six manufacturers and 17 cars in LM GTE Pro;•    Thirteen competitors in LM GTE Am;•    Dr Wolfgang Ullrich, ACO special co more >>
2018 Le Mans 24 Hours -In 24 hours the field will be revealed!
Who will be at the start of the 86th Le Mans 24 Hours? Answer in 24 hours! Tomorrow at 15:00 at the Rétromobile Show in Paris the Automobile Club de l’Ouest will reveal the list of the 60 entrants selected to start the Le Mans 24 Hours on 16th June. F more >>
2018 Le Mans 24 Hours The last teams invited!
After the results of the last round of the Asian Le Mans Series today, Sunday, the names of the last teams invited to take part in qualifying for the Le Mans 24 Hours (16 and 17 June) are now known.In five days, on Friday 9th Febr more >>
Risi Competizione and Keating Motorsports joint effort for 24h Le Mans 2018
 Risi Competizione and Keating Motorsports have announced a partnership for the 86th Annual 24 Hours of Le Mans race to be held June 16-17, 2018.Giuseppe Risi and Ben Keating, both business owners and automotive dealers in the more >>
Toyota - Endurance, The legend continues!
When the “monsters” parade. This is how one could express - but not sum up as they have enjoyed so many adventures together – the relationship between Toyota and Le Mans, and between Toyota and the FIA World Endurance Championship as each has contributed to writing a part of the other’s history. more >>
The Le Mans trophy has arrived at the Porsche Museum
Handover of the winner's trophyThe winner’s trophy for the 24 Hours of Le Mans has found a new home at the Porsche Museum. After three overall victories in a row in the toughest long-distance race in the world, Porsche has now earned the ri more >>
JAMIROQUAI launches the Le Mans 24 Hours Grand Concert with the MMA!
Friday 15th June 2018 in the MMArenaIn 2018, the Le Mans 24 Hours will be celebrating their 86th staging and the event continues to innovate and excite everybody’s curiosity and interest wit more >>
"Our Le Mans", here is the docufilm by Cetilar Villorba Corse
Distribution on Monday, December 18 with English subtitles “Our Le Mans”, the docufilm that tells about Cetilar Villorba Corse debut at the 2017 24 Hours of Le more >>
2018 Le Mans 24 Hours Entries open on 18th December
•    Entries for the 2018 Le Mans 24 Hours open on 18th December and close on 5th February,•    Seven teams have already been invited to take part,•    The complete entry list will be revealed on 9th February. more >>
TOTAL - Official fuel supplier to endurance for five years
from left to right : Momar Nguer, General Manager of the Marketing & Services department and member of the Total Executive Committee and Pierre Fillon, President of the Automobile Club de l’Ouest.The Automobile Club de l’Ouest and more >>
2018 Le Mans 24 Hours poster revealed
Preparations for the 2018 Le Mans 24 Hours on 17-18 June are in full swing. Thanks to an original interactive reveal, the poster of the greatest endurance race in the world was unveiled on the evening of 22nd November. It’s a take on the cues of posters as works of art usi more >>
Michelin - Le Mans - Endurance, the story continues!
Photo caption:  from left to right : Gérard Neveu, Le Mans Endurance Management CEO (FIA WEC and ELMS), Pascal Couasnon, Michelin Motorsport Manager and Pierre Fillon, President of the Automobile Club de l’Ouest. more >>
The 2017 Le Mans 24 Hours at the cinema on 23rd November!
•    Several drivers will be present for an autograph session in the Mega CGR Saint-Saturnin Le Mans at 18:30•    Film starts at 20:00 followed by a discussion •    Film shown simultaneously on myACO in French or in English  more >>
The 2017 Le Mans 24 Hours film
23rd November at the Mega CGR cinema in Saint Saturnin – Le Mans•    Screening at the Mega CGR cinema in Saint Saturnin – Le Mans on 23rd November•    Film shown simultaneously on myACO& more >>
Reserve your 2018 Le Mans 24-Hours weekend from 17th October onwards!
•    Now is the time to start preparing for your week packed with festivities and motor racing at the 86th Le Mans 24 Hours•    Ticket office open for ACO Club members on Tuesday 17th October at 10:00 more >>
Le Mans 24 Hours - World-class sport, worldwide coverage
On Sunday 18 June, the chequered flag of the 24 Hours of Le Mans marked the end of a week of sporting splendour. Media coverage was remarkable. Figures show excellent performance across the board, reflecting the immense popularity of the worl more >>
Toyota Gazoo Racing 24h Le Mans statement
TOYOTA GAZOO Racing can confirm it has received an apology from Vincent Capillaire regarding his actions during the Le Mans 24 Hours. We have fully accepted his apology and acknowledge that his sporting gesture was never intended to cause any negative consequences for our #7 car. We remain on good terms with Vincent and we consider the matter is n more >>
Gibson Engines Make History on Overall Podium at Le Mans
British built engines dominate at prestigious raceRepton based engine manufacturer Gibson Technology is celebrating after making history at the Le Mans 24 hour race last weekend. In the history of Le Mans, a race which expects LMP1 dominance, an LMP2 car has never more >>


2001-2021 full copyright