Nissan GT-R LM Nismo

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Nissan GT-R LM Nismo
Nissan Motorsports - Nissan GT-R LM Nismo -23 (18860958202).jpg
Category Le Mans Prototype 1 Hybrid
Constructor Nissan
Designer(s) Ben Bowlby
Technical specifications[1]
Chassis Carbon fibre
Suspension (front) Independent multi-link pushrods
Suspension (rear) Independent multi-link pushrods with hydraulic anti-roll bar
Length 4,645 mm (182.9 in)
Width 1,900 mm (75 in)
Height 1,030 mm (41 in)
Engine Nissan VRX30A 3.0 L (3,000 cc) direct-injected twin-turbocharged V6 engine in a longitudinal front mid-engine configuration
Transmission Xtrac five-speed hydraulically-activated sequential gearbox and epicyclic reduction gearbox with limited-slip differential
Weight Appr. 880 kg (1,940 lb)
Fuel Shell V-Power LM24
Lubricants Motul
Tires Michelin
Competition history
Notable entrants Japan Nissan Motorsports
Notable drivers United Kingdom Harry Tincknell
France Olivier Pla
Japan Tsugio Matsuda
Germany Michael Krumm
United Kingdom Jann Mardenborough
United Kingdom Alex Buncombe
United Kingdom Max Chilton
Spain Lucas Ordóñez
Russia Mark Shulzhitskiy
Debut 2015 24 Hours of Le Mans
RacesWinsPolesF.Laps
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The Nissan GT-R LM Nismo was a sports prototype racing car built by the Nissan Motor Company and their motorsports division Nismo. Designed for the Le Mans Prototype 1 Hybrid (LMP1-H) regulations of the FIA World Endurance Championship and the 24 Hours of Le Mans, the GT-R LM was unique amongst Le Mans Prototypes at the time for utilizing a front mid-engine layout for its internal combustion engine as opposed to the rear mid-engine layout used by nearly all other competitors in the category. It was Nissan's first prototype since the R391 competed in 1999, although the company had supplied engines in recent years. The car was branded after the Nissan GT-R road car and shares similar engine and drivetrain configurations, but is not related to the sports car. The GT-R LM Nismo program was announced on 23 May 2014,[2] while the car was publicly shown for the first time in a Nissan commercial during Super Bowl XLIX on 1 February 2015.[1] The car was retired from competition at the end of 2015 after having competed in only one race.

Design and development[edit]

Chief designer Ben Bowlby was given the brief from Nissan to not design an "Audi copy".[3] Bowlby placed the GT-R LM's combustion engine in front of the cockpit, a layout that has not been used in Le Mans prototypes since the Panoz LMP01 Evo in 2003.[4] Unlike the Panoz's rear-wheel drive powertrain, the GT-R LM powers the front axle through a gearbox located in front of the engine. This was done in the belief Nissan could construct a front-engine car that is faster and has improved stability and efficiency.[5] When designing the car, Bowlby noted the rear-end designs of Le Mans Prototype were limited in size, resulting in poor aerodynamic efficiency and saw the front-end of such vehicles had been largely untouched, "So we thought: why not turn the rules on their head and make a car with lots of downforce at the front? Not only does this give us greater freedom within the rules, but front downforce is generated more efficiently, with less drag. Moreover, with the front end doing most of the work, we could trim out the rear wing and save even more drag, which is invaluable at Le Mans."[6] The chassis was made from carbon fibre which helped engineers in lowering the weight of the car to the minimum limit of 870 kilograms (1,920 lb) as set by motorsport's governing body, the Fédération Internationale de l'Automobile (FIA).[7]

The engine, co-developed by Nissan and Cosworth, is a 3.0 L (180 cu in) 60-degree V6 with dual turbochargers and direct injection, and is seen by Nissan as the most fuel efficient design. Behind the engine and beneath the cockpit is a kinetic energy recovery system using two flywheels developed by Torotrak. The flywheels gain energy from the use of the front brakes then discharges that energy back to the front wheels via a driveshaft running over the top of the combustion engine. The flywheels can also output power to a secondary driveshaft which is connected to a limited-slip differential at the rear of the car which feeds epicyclic gearboxes located in each rear wheel hub, allowing the GT-R to be all-wheel drive if necessary. The combustion engine outputs approximately 500 hp (370 kW; 510 PS) while the flywheel system is intended to have an additional output of approximately 750 hp (560 kW; 760 PS).[4] The company sought engineers from its performance division Nismo for their knowledge on the engine's development,[8] but had problems installing the power plant into the monocoque.[9] Engineers interpreted the regulations set by the FIA and the organiser the Automobile Club de l'Ouest (ACO) differently, causing a minor chassis redesign, and could only be inserted through the front windshield.[9] The developers prioritised efficiency over sheer thrust since the ACO established rules that limited fuel capacity for Le Mans Prototype 1 (LMP1) hybrids to 68 litres (18 US gal).[10]

With the weight bias of the GT-R LM heavier in the front and power primarily directed at the front axle, the wheels are offset to balance the car. Tyres in the front are 14 in (360 mm) wide, while the rear tyres are only 9 in (230 mm) wide.[11] Michelin served as the team's tyre supplier and worked closely with Nissan to determine the correct compound and size for the car's front and back wheels.[8] Cooling for the engine, gearbox and flywheel systems is located in the nose of the car, allowing the bodywork around the cockpit to be utilised as airflow tunnels. The use of the tunnels required the turbochargers to be placed on top of the engine, exhausting out of the top of the bodywork in front of the windshield. The rear drivetrain is designed without traditional halfshafts that would be required to traverse the tunnels, opting instead for the epicyclic gearing system to work around the tunnels.[4] The suspension geometry was carefully refined and consisted of adjustable Penske rear dampers and Öhlins front dampers along with a rear hydraulic anti-roll bar system.[4][7] The Xtrac five-speed hydraulically-activated sequential gearbox was cast by a Michigan-based company.[4][12] Cosworth supplied the car's engine control unit for the gearbox which provided power to the wheels via the hydraulic limited-slip differential.[10]

Programme and testing[edit]

Nissan publicly announced its GT-R LM programme in East London on 23 May 2014.[13] Six months later, drivers began testing the car for the first time in a two-day roll-out session at the Nissan Technology Centre in Stanfield, Arizona.[14] Testing continued into January 2015 at the Circuit of the Americas.[15] Initially planned for a launch in Europe, Nissan North America chose instead to integrate the new car into their Super Bowl commercial and the film was made during the GT-R LM's testing at Circuit of the Americas.[12] Testing resumed in February at Palm Beach International Raceway which saw the GT-R LM undertake its first running in night conditions,[16] before travelling to Michelin Laurens Proving Grounds in South Carolina that same month for straight line speed testing. A weeks' worth or running at Sebring International Raceway in March ended prematurely after two days because of a engine mounting problem.[17]

Nissan intended to enter two GT-R LM's in the 2015 FIA World Endurance Championship (WEC) starting in April 2015,[18] while a third car would be entered for the 24 Hours of Le Mans.[19] By the time of its planned debut at Silverstone, drivers had covered 3,800 kilometres (2,400 mi) with the GT-R LM in testing but its first racing appeareance was delayed until Le Mans because the car twice failed its crash test and was forced to miss the WEC pre-season test session at the Circuit Paul Ricard.[20] The first crash test ended in failure because the car's front roll hoop was damaged. Engineers were also mandated to redesign the car's door because the FIA decided they should have include an anti-burst load but failed its test first time around and the door's structure was entirely altered following its skin cracking.[21] Testing resumed in April with four days' worth of endurance running with 2,000 kilometres (1,200 mi) ammassed at the NCM Motorsports Park race track in Bowling Green, Kentucky.[22]

The company named nine drivers to the team in early 2015. Former Le Mans winner Marc Gené was the first driver announced for the program, moving to the team from rivals Audi.[23] Gené later announced in May 2015 that he would not race for the team but would remain in an advisory capacity. His seat was filled by Mark Shulzhitskiy.[24] Harry Tincknell, who won the LMP2 category at Le Mans in 2014, joined former European Le Mans Series champion Olivier Pla and defending Super GT champion Tsugio Matsuda as the next set of drivers.[25] Jann Mardenborough and Lucas Ordóñez, former winners of Nissan's GT Academy were also announced alongside former FIA GT1 World Champion Michael Krumm.[26] Former Marussia Formula One driver Max Chilton and multiple sports car racer Alex Buncombe were the final two drivers confirmed for Nissan's programme.[27]

The car underwent further testing after Le Mans at NOLA Motorsports Park in December 2015 before the program was officially cancelled on 22 December. A second-generation GT-R LM Nismo had been designed for 2016, adapted to run an electrical hybrid system, but was never completed before the project ended.[28]

The GT-R LM made its virtual debut in Gran Turismo 6 as downloadable content for the 2015 GT Academy competition

See also[edit]

References[edit]

  1. ^ a b "Nissan Reveals Le Mans Challenger During Super Bowl". Nissan Motor Company. 2 February 2015. Retrieved 3 February 2015. 
  2. ^ Dagys, John (23 May 2014). "Nissan Announces Factory LMP1 Program for 2015 with GT-R". Sportscar365. Retrieved 5 February 2015. 
  3. ^ Pruett, Marshall (2 February 2015). "Catching Up With Darren Cox: As The World Sees The Nissan LMP1". DailySportsCar. Retrieved 5 February 2015. 
  4. ^ a b c d e Pruett, Marshall (2 February 2015). "The Nissan GT-R LM NISMO: Tech Spec & Ben Bowlby Q&A". DailySportsCar. Retrieved 3 February 2015. 
  5. ^ de Paula, Matthew (31 May 2015). "The Revolutionary Nissan GT-R LM Nismo Race Car Has Road-Car Roots". Forbes. Retrieved 24 July 2017. 
  6. ^ Burt, Matt (10 June 2015). "Le Mans 24 Hours - why Nissan has gone front-wheel drive". Autocar. Retrieved 24 July 2017. 
  7. ^ a b Vijayenthiran, Viknesh (15 May 2015). "Nissan Finalizes Specs For GT-R LM NISMO Ahead Of 2015 Le Mans Race". Motor Authority. Retrieved 24 July 2017. 
  8. ^ a b Ingram, Antony (26 February 2015). "Nissan GT-R LM Nismo Le Mans car – 'Our goal is to win'". Evo. Retrieved 24 July 2017. 
  9. ^ a b Collins, Sam (10 August 2015). "Nissan GT-R LM Nismo". Racecar Engineering. Retrieved 24 July 2017. 
  10. ^ a b Shaw, Tony (February 2015). "Nissan GT-R LM NISMO: Hybridized, FWD Le Mans Weapon". Car and Driver. Retrieved 29 November 2017. 
  11. ^ "Bowlby: "Nissan are Bold Challengers, Prepared to Innovate". Sportscar365. 1 February 2015. Retrieved 5 February 2015. 
  12. ^ a b Pruett, Marshall (2 February 2015). "Developing the Nissan GT-R LM NISMO". Road & Track. Retrieved 24 July 2017. 
  13. ^ Harmer, Alex (23 May 2014). "Nissan LMP1 announced". Motor Sport. Retrieved 25 July 2017. 
  14. ^ Boekel, Win (18 November 2014). "Nieuwe LMP1 van Nissan in Arizona het circuit op voor shakedowntest". RaceXpress (in Dutch). Retrieved 25 July 2017. 
  15. ^ "Rumour: Nissan LMP1 testing at COTA". SportsCarGlobal. 17 January 2015. Retrieved 25 July 2017. 
  16. ^ DiZinno, Tony (13 February 2015). "Hectic Month Ahead for Nissan LMP1 Program Before Prologue". SportsCar365. Retrieved 25 July 2017. 
  17. ^ Watkins, Gary (5 March 2015). "Mechanical problem curtails Nissan's Sebring LMP1 test". Autosport. Retrieved 25 July 2017. 
  18. ^ DeGroot, Nick (23 May 2014). "Nissan to enter factory LMP1 car in 2015 WEC competition". motorsport.com. Retrieved 25 July 2017. 
  19. ^ Watkins, Gary (19 September 2014). "Nissan's 2015 Le Mans 24 Hours and WEC LMP1 car to run in November". Autosport. Retrieved 25 July 2017. 
  20. ^ Watkins, Gary (June 2015). "Back to front thinking". Motor Sport. 91: 96–98. 
  21. ^ "Nissan: "It went off like a bomb"". Top Gear. 29 April 2015. Retrieved 25 July 2017. 
  22. ^ "Nissan GT-R LM NISMO LMP1 Le Mans car completes major test in USA". Autosport. 17 April 2015. Retrieved 25 July 2017. 
  23. ^ Beckett, James (4 February 2015). "Gene to lead Nissan attack at Le Mans". Buckingham & Winslow Advertiser. Retrieved 25 July 2017. 
  24. ^ Ehrhardt, Nikki (10 May 2015). "24 Hours of Le Mans 2015 – Nissan's choice of a front engine (video)". Automobile Club de l'Ouest. Retrieved 25 July 2017. 
  25. ^ Goodwin, Graham (5 February 2015). "Pla, Tincknell & Matsuda Confirmed As Nissan LMP1 Drivers". DailySportsCar. Retrieved 25 July 2017. 
  26. ^ DiZinno, Tony (11 February 2015). "Mardenborough, Ordonez, Krumm Announced as Nissan LMP1 Drivers". Sportscar365. Retrieved 13 February 2015. 
  27. ^ "Chilton, Buncombe complete Nissan LMP1 line-up". Speedcafe. 3 March 2015. Retrieved 25 July 2017. 
  28. ^ Watkins, Gary (22 December 2015). "Nissan reveals why it has withdrawn from the 2016 WEC". Autosport. Retrieved 22 December 2015. 

External links[edit]