Launch control is an electronic aid to assist drivers of both racing and street cars to accelerate from a standing start.
Popular automobiles with launch control include the BMW M series, certain marques of the Volkswagen Group with Direct-Shift Gearbox (most notably the Bugatti Veyron), Porsche 911 (sport++ mode), Panamera Turbo, and certain General Motors products. Mitsubishi also incorporated launch control into their Twin Clutch SST gearbox, on its "S-Sport" mode, but the mode is only available in the Evolution X MR and MR Touring (USDM). The Nissan GT-R has electronics to control launch but the company does not use the term "launch control" since some owners have equated the term with turning off the stability control to launch the car, which may void the warranty of the drivetrain. The current version of Nissan GT-R allows user to launch the car by turning the Traction Control to "R" mode.
Principle
Launch control operates by using an electronic accelerator and a computer program. The software controls acceleration based on engine specifications to make the car accelerate smoothly and as fast as possible, avoiding spinning of the drive wheels, engine failure due to over-revving, and clutch and gearbox problems. In racing cars, this feature is only available at the start of the race, when the car is stationary in the starting grid. After the car is running at a certain speed, the software is disabled.
Purpose
Racing drivers have only a very short time at the start of a race in which to achieve competitive acceleration. High power delivery to the gearbox and driven wheels cannot easily be managed even by the most skilled drivers, even in high traction conditions.
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