The first prototype developed by BMW M Motorsport in 25 years was unveiled yesterday at the Petersen Museum in Los Angeles, USA. It was the first time the BMW M Hybrid V8 was shown uncamouflaged and in its iconic racing colours.
Like the camouflage livery seen during the earlier testing phase, the design of the livery for the 2023 racing season also comes from BMW Group Designworks. The livery represents a significant departure from the heritage-based ‘Icons of IMSA’ camouflage with a future-facing coat of arms comprised of modern, bold, fractal blocks of the iconic M colours and the M logo.
Acura, Honda’s premium and performance brand mainly sold in North America, has had a long presence in endurance racing with prototype models. Next year, at the Rolex 24 at Daytona, it will debut an all-new electrified racing car, the ARX-06, the sixth generation of a successful line of Acura endurance racing prototypes.
The ARX-06 has custom bodywork and aerodynamics based around an all-new ORECA LMDh chassis. The chassis carries an electrified hybrid power unit with an equally new, bespoke twin-turbocharged 2.4-litre V6 engine designed, developed and manufactured by Honda Performance Development (HPD), the racing arm for Acura Motorsports in North America.
Smallest combustion engine With its 2.4-litre displacement, the AR24e power unit is the smallest displacement internal combustion engine conceived by HPD for endurance racing. It still meets the performance target of 500 kW as measured at the rear axle by torque meters. It features a 90-degree V-angle to reduce its centre of gravity and polar moment of inertia, and can run on sustainable low-carbon fuel.
The hybrid powerplant includes an IMSA-specified electric Bosch Motor Generator Unit (MGU) and Williams Advanced Engineering battery pack. The MGU is contained in a common transmission casing and gearbox internals provided by Xtrac.
“We’ve taken the challenge presented by this new rule package from IMSA, and developed what we believe is a very competitive solution,” said Pierre Descamps, who led HPD’s powertrain design team for the ARX-06. “We’ve gone in a new direction for HPD in the design of the ICE. It is still a V6, which of course for Honda is well-known, but we have incorporated several new elements which we believe will make best use of the electric MGU and battery pack. Our new engine will rev to the maximum 10,000 rpm set by the rules, so it also makes a wonderful sound!”
Both IMSA in North America and FIA World Endurance Championship (WEC) rules require manufacturers to use one of four approved prototype chassis, fitted with IMSA-homologated, manufacturer-designed and branded bodywork and engines.
Continued partnership with ORECA In the case of the ARX-06, HPD and Acura have elected to continue their successful relationship with ORECA. Since moving into chassis design and construction in 2007, ORECA has produced a series of winning sports prototypes, including the Acura ARX-05.
HPD’s Vehicle Performance Group worked closely with the ORECA design team and engineers to simulate chassis layout geometries and lap time optimization studies. They also ‘coded’ the new car into HPD’s static and dynamic Driver in the Loop simulators to begin development of the car’s vehicle dynamics and vehicle dynamic control systems.
Critical to the projects was a clean sheet hybrid powertrain control system, brake-by-wire and vehicle dynamics control system – all written in-house at HPD. This control system architecture was implemented on a Formula 1-spec ECU hardware platform. HPD also utilizes its custom, in-house developed ultra-high speed data-logging system.
Styling by Acura Design Studio The exterior styling of the ARX-06 was led by the Acura Design Studio in Los Angeles, in conjunction with ORECA, which is also one of the chassis suppliers approved for prototype competition in both the IMSA WeatherTech SportsCar Championship and the WEC.
Driver and team input was also sought throughout the design process. One effective change was a revision to the placement of the rearview mirrors. This is a seemingly minor adjustment but actually has a large effect on vehicle aerodynamics. Using VR headsets, the drivers were able to sit in the car virtually and recommend a much lower placement for the side mirrors, improving both the aero efficiency of the ARX-06 and visibility for the drivers.
Acura will continue its partnerships with the successful Wayne Taylor Racing and Meyer Shank Racing teams to campaign a pair of ARX-06 entries in the GTP category of the 2023 IMSA WeatherTech SportsCar Championship.
Motorsport is an expensive sport to start with and for teams that participate professionally, it can be very expensive. In the upper reaches of the sport, like Formula 1 and endurance racing, it has become so expensive that the FIA and other organisations have looked for ways to control the costs – while still enabling the teams to innovate to be competitive and advance.
Endurance racing from this year sees the birth of the Le Mans Hypercar (LMH) and Le Mans Daytona hybrid (LMDh) classes which have many things in common. This will allow the cars to race in the American series run by IMSA as well as the European events like the Le Mans 24-Hours. This extends the scope of racing for teams who can now look at more events to take part in.
The Porsche Penske Motorsport team has developed the new Porsche 963 to take advantage of this. From 2023, two of the hybrid LMDh-spec prototypes will be entered in both the World Endurance Championship (WEC) and the IMSA WeatherTech SportsCar Championship.
The racing car which was unveiled yesterday at the Goodwood Festival of Speed in England is being developed at two locations – in Germany for the WEc and in the USA for the IMSA series. The exchange of data between the high-tech centres of Porsche Penske Motorsport occurs almost in real-time.
The official race debut of the 963 is planned to take place in January 2023 at the 24 Hours of Daytona in the USA. In the meantime, the WEC has opened the door for testing as part of the upcoming world championship races this year. Porsche Penske Motorsport is aiming for a non-competitive dress rehearsal at the final round of the season in Bahrain this November.
In compliance with the LMDh regulations, the 963 is based on an LMP2-category chassis. This newly developed chassis is supplied by the Canadian high-tech company Multimatic. Bosch, Williams Advanced Engineering and Xtrac contribute the standard hybrid components to all teams. At the heart of the powertrain lies a 4.6-litre V8 Biturbo, the engine based on the 918 Spyder hybrid sportscar. Its DNA goes back to the RS Spyder racing car, with which Porsche and Team Penske collected many victories between 2005 and 2008.
“Over the past few months, our people at Porsche Motorsport and Team Penske have grown into an efficient and committed squad – the Porsche Penske Motorsport Team,” said Urs Kuratle, Director Factory Motorsport LMDh. “We’ll have powerful driver crews in the 4 factory cars. The collaboration with our long-standing tyre partner Michelin and the chassis manufacturer Multimatic works flawlessly. The Porsche 963 should be homologated this autumn. Until then, we want to make further progress with test drives and gain additional insights. We can hardly wait for our first outing.”
The design of the new 963 echoes the victorious 956 and 962 classics from the 1980s. A continuous strip of lighting at the rear echoes the distinctive feature of the latest 992-generation 911. The white-red-black vehicle design is a salute to Porsche’s successful racing cars. And another tradition lives on: the new Porsche racer will be available to customers from the first year of competition.
“After 7,889 test kilometres during the first half of 2022, we’re on a very good path but there is still work to be done before the start of next season,” said Thomas Laudenbach, Vice-President Motorsport. “Our new Porsche 963 should continue the legacy of legendary models such as the 917, 935, 956, 962 and the 919 Hybrid. I’m positive that we’ll be well-positioned when it comes to technology and we’ve also created the relevant team structures to set us up for wins in the thrilling competition between many manufacturers and different concepts.”
In 2023, endurance racing will begin a new chapter when the Le Mans Hypercar (LMH) and Le Mans Daytona h (LMDh) prototypes start racing for the first time. This new era will start off officially with the 2023 Rolex 24 at Daytona. The event is usually held on the last weekend of January or first weekend of February as part of Speedweeks.
To date, carmakers that have confirmed their participation with LMDh racing cars are Acura, Audi, BMW, Porsche, Alpine and Lamborghini. To that list can be added Cadillac, which may seem unusual as most people don’t associate the American luxury carmaker with motorsports.
However, Cadillac does go racing and some recent achievements include winning the IMSA WeatherTech SportsCar Championship in 2021, 2018 and 2017; winning the Rolex 24 at Daytona 4 times in a row (2020, 2019, 2018 and 2017); and winning the Michelin North American Endurance Cup 4 times (2020, 2019, 2018 and 2017).
The carmaker’s LMDh car is referred to as the Project GTP Hypercar. It is a third-generation prototype racing car from the American brand. In 2023, Cadillac will contest the IMSA WeatherTech SportsCar Championship and the World Endurance Championship (WEC), including the 24 Hours of Le Mans.
“Cadillac will be competing again on the world racing stage, and we are all thrilled to return to Le Mans after 20 years,” said Global Cadillac Vice-President Rory Harvey. “By competing in both the 2023 IMSA and WEC championships, Cadillac Racing has the opportunity to demonstrate its capability, craftsmanship and technology.”
Co-developed by Cadillac Design, Cadillac Racing and Dallara, the Project GTP Hypercar incorporates key brand design characteristics. Elements of the brand’s heritage such as vertical lighting and floating blades are present throughout and connect the Project GTP Hypercar to the future of Cadillac.
“The Project GTP Hypercar is a unique convergence of form and function and showcases Cadillac’s future performance aesthetic,” said Chris Mikalauskas, lead exterior creative designer, Cadillac. “We have plenty more to come, from the upcoming race car to amazing production vehicles.”
“Competing for the overall win at Le Mans with an iconic American brand like Cadillac is an honour,” added Laura Wontrop Klauser, GM Sportscar Racing Program Manager. “The entire team is excited to continue building Cadillac’s racing legacy by competing against the very best internationally and in the world’s toughest race.”
The new racing car will begin on-track testing in the near future. It will be powered by an all-new 5.5-litre DOHC V-8 engine that will be paired to the LMDh common hybrid system. The hybrid system will be composed of systems and components supplied by Bosch, Williams Advanced Engineering and Xtrac. Bosch will supply the motor generator unit (40 kW), while the battery system and control electronics from Williams will go on from below the chassis. The total system output will be limited to 500 kW.
Bosch, Williams Advanced Engineering and Xtrac will supply the systems and components for the common hybrid powertrain used by the LMDh racing cars.
The P1359 gearbox (pictured above) developed by XTrac has a 7-speed transverse arrangement with an integrated motor-generator unit (MGU) driving into the gearbox through an optimised geartrain. The gearbox uses Xtrac’s proven P1254 integrated valve actuator gearchange system. It houses full form ground and Xtrem polished gears and shafts in a magnesium RZ5 casing, which is a structural part of the car taking all of the loads from the rear suspension and rear impact structure, rear wing, and safety wheel tethers.
The gearbox also includes a limited-slip plate differential with an externally gas-charged pre-load and a semi-dry-sump oil system. Integral to the gearbox is a 3-litre engine oil catch tank which simplifies the powertrain installation, and the whole package including the MGU drive, but not including the MGU itself, weighs 78 kgs.
Ahead of the testing phase for the LMDh prototype in the IMSA WeatherTech SportsCar Championship in America next year, BMW M Motorsport is announcing the name and showing the racing car’s design, albeit with livery that serves as camouflage. To be called the BMW M Hybrid V8, its look has been designed by BMW Group Designworks and is clearly recognizable as a BMW M car.
Recognisable as a BMW M Motorsport car
This message is echoed by Franciscus van Meel, CEO of BMW M GmbH who explained that the most critical task and the greatest challenge for the design team in the LMDh programme design team was that the prototype must be clearly recognisable as a BMW M Motorsport car.
“I can say this to all the fans: just one look is enough to confirm that the BMW M Hybrid V8 is a BMW. It clearly carries the genes of BMW M. I also love the camouflage livery with its references to the great history of the brand in North America. Congratulations to the design and aerodynamics departments at BMW M Motorsport and Dallara on their great work. I can hardly wait to see the BMW M Hybrid V8 on the track soon,” said van Meel.
The hallmark of the design is the wide kidney element. In addition, it boasts typical BMW M design elements such as the nested 50th anniversary logo on the bonnet, twin BMW icon lights, dynamic body side, Hofmeister kink window graphic, M ‘hook’ mirrors and the tail-lights.
Historic racing machines on the camouflage
Look closely and you will see that the camouflage livery contains many elements from 5 decades of motor racing history in North America. The images of iconic BMW machines – the 1976 3.0 CSL, the 1981 M1/C, the 1978 320i Turbo, the 1986 GTP, the M3 E36 GTS-2, the Z4 GTLM and the M8 GTE – create a graphic mosaic which obscures the shape of the BMW M Hybrid V8 so rivals can’t determine the exact form.
“My team’s job was to make the BMW M Hybrid V8 look like a BMW, and embrace every opportunity to make it also perform like one on the racetrack,” said BMW Group Designworks Global Automotive Director Michael Scully. “The design is rooted in BMW’s DNA of purposeful, efficient performance, and the exterior’s bold, determined character invokes BMW’s frontiersmanship of turbo power, now united with an optimized hybrid electric powertrain. The camouflage livery celebrates the 50 Years of M by commemorating the great cars of BMW’s storied history in IMSA racing while uniquely cloaking the BMW M Hybrid V8’s future-facing exterior geometry and technologies during the critical on-track development phase of the project.”
“We’ll follow-up this camouflage with a works livery that exemplifies the dynamism and excitement of hybrid electric-powered competition,” he added.
What is LMDh?
LMDh stands for Le Mans Daytona Hybrid which is a category in the new Hypercar class of the World Endurance Championship (WEC). Regulations specify that LMDh race cars have a combustion engine and an electric motor. While each manufacturer can use their own combustion engine, the electric motor, battery and transmission are standard parts. The chassis is also built by an external partner.
The new racing car will compete in the new GTP class of the IMSA series, at such prestigious classics as the 24 Hours of Daytona, the 12 Hours of Sebring, and the iconic Petit Le Mans at Road Atlanta. BMW M Motorsport is working closely with the legendary Italian race car specialist Dallara on development of the BMW M Hybrid V8.
It’s basically a prototype racing car and BMW M Motorsport is returning to international prototype racing with the BMW M Hybrid V8. The last big victory for a BMW prototype came back in 1999, when the BMW V12 LMR won the 24 Hours of Le Mans. That car had also triumphed in the 12 Hours of Sebring in the same season.
