McLaren M838T engine

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The M838T engine in the McLaren 12C.

The McLaren M838T is a family of 3,799 cc (3.8 L; 231.8 in3) twin-turbocharged 90° V8 engines produced by McLaren Automotive since 2010. The M838T engines are designed and developed in collaboration with Ricardo plc.[1]

Development[edit | edit source]

McLaren bought the rights to the Tom Walkinshaw Racing developed engine, itself based on the Nissan VRH engine architecture,[2] which was designed for the IRL IndyCar Series but never raced. Little of that engine remains in the M838T other than the 93 mm (3.66 in) bore.[3] In only 18 months, Ricardo went from paper to running prototype.

Developed with help from Ricardo, the M838T has a redline at 8,500 rpm, with 80% of the engine's torque being available as low as 2,000 rpm. McLaren claims that the engine has the highest horsepower to CO 2 emission ratio of any current production engine.[4]

The M838T is built at Ricardo's engine assembly facility in Shoreham-by-Sea, West Sussex.[5] The turbochargers are supplied by Mitsubishi Heavy Industries (MHI) and are different units from those used in Mitsubishi Lancer Evolutions. The ATS GT, an Italian supercar produced by Automobili Turismo e Sport, is based on the McLaren 650S Coupé and, appropriately, features the M838T engine.

Naming[edit | edit source]

The M838T's engine naming nomenclature can be broken down into the following: "M" represents McLaren, "838" represents a V8 engine with a 3.8 L displacement, and "T" represents a twin-turbocharged engine.

Specifications[edit | edit source]

  • Type: 90° twin-turbocharged V8 fuel feed by fuel injection[6]
  • Displacement: 3,799 cc (3.8 L; 231.8 in3)
  • Bore × stroke: 93 mm (3.7 in) × 69.9 mm (2.75 in)
  • Valvetrain: 4 valves per cylinder, 32 valves (total) DOHC per cylinder bank, dual VVT[6]
  • Compression ratio: 8.7:1[6]
  • Lubrication: Dry sump[6]
  • Redline: 8,500 rpm
  • Peak power output: 600 PS (592 hp; 441 kW) @ 7,000 rpm[6]
  • Peak torque output: 600 N·m (443 ft·lb) @ 3,000 - 7,000 rpm[6]

Models[edit | edit source]

Only models featured in the Forza series will be listed.

Model Years Codename Power Torque
12C 2010-2012 M838T 600 PS (592 hp; 441 kW)[6] 600 N·m (443 ft·lb)[6]
12C GT3 2011-2014 M838T 500 PS (493 hp; 368 kW)[7] 500 N·m (369 ft·lb)[8]
650S Coupé/Spider 2014-2016 M838T 650 PS (641 hp; 478 kW)[9] 678 N·m (500 ft·lb)[9]
570S 2015-present M838TE 570 PS (562 hp; 419 kW)[10] 600 N·m (443 ft·lb)[10]
600LT 2018-present M838TE 600 PS (592 hp; 441 kW)[11] 620 N·m (457 ft·lb)[11]
ATS GT 2018-present M838T 730 PS (720 hp; 537 kW) 780 N·m (575 ft·lb)
P1 2013-2015 M838TQ 737 PS (727 hp; 542 kW) + 179 PS (177 hp; 132 kW) from McLaren ECU electric motor[12]
Total 916 PS (903 hp; 674 kW)[12] 		720 N·m (531 ft·lb) + 260 N·m (192 ft·lb) from McLaren ECU electric motor[12]Total 980 N·m (723 ft·lb), Peak 900 N·m (664 ft·lb)[12]
P1 GTR 2015-2016 M838TQ 800 PS (789 hp; 588 kW) + 200 PS (197 hp; 147 kW) from McLaren ECU electric motor
Total 1,000 PS (986 hp; 735 kW)[13] 		Reported Peak 1,001 N·m (738 ft·lb)[14]
Official 890 N·m (656 ft·lb) (760 N·m (561 ft·lb) + 130 N·m (96 ft·lb) from McLaren ECU electric motor[15]

M840T[edit | edit source]

Main article: McLaren M840T engine

The M840T is the 3,994 cc (4 L; 243.7 in3) updated version of the M838T, with 41% new engine components. It was first used in the McLaren 720S in 2017.

Gallery[edit | edit source]

  • M838TE (570S and 600LT).

  • M838T (ATS GT).

Appearances[edit | edit source]

References[edit | edit source]

  1. ↑ McLaren Automotive Official Website - McLaren M838T Engine Claims Victory At International Engine Of The Year Awards (archived)
  2. ↑ Jalopnik, Car History - This 20-Year-Old Nissan Is The Origin Of All Of McLaren's Modern V8s, Author: Raphael Orlove, Date: 3/10/2017
  3. ↑ Car and Driver - 2012 McLaren MP4-12C, Author: Don Sherman, Date: 2/14/2011
  4. ↑ CAR Magazine - McLaren MP4-12C | Mclaren P11 | News and photos, Author: Tim Pollard, Date: 9/8/2009
  5. ↑ Ricardo - New Ricardo engine assembly facility commences pilot production, Date: 2/13/2011
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 Ultimatecarpage.com - 2011 - 2012 McLaren MP4-12C Specifications
  7. ↑ Ultimatecarpage.com - 2011 - 2014 McLaren MP4-12C GT3 Specifications
  8. ↑ Forza Motorsport 4
  9. ↑ 9.0 9.1 Telegraph, McLaren - McLaren reveals details of 650S, Author: Chris Knapman, Date: 2/17/2014
  10. ↑ 10.0 10.1 McLaren Automotive Official Site - McLaren Sports Series - 570S Coupé - Specification
  11. ↑ 11.0 11.1 McLaren Automotive - McLaren 600LT - The edge is calling
  12. ↑ 12.0 12.1 12.2 12.3 McLaren Automotive Official Site - McLaren P1™ - Specification
  13. ↑ McLaren Automotive Official Site - McLaren Ultimate Series - P1™ GTR
  14. ↑ Forza Motorsport 6
  15. ↑ McLaren Automotive - McLaren P1 GTR - Owner's Manual
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