Two step limiting confines rpms at two sperate points. A two-step rev limiter is a module that regulates the engines rpms for a controlled launch and optimal power settings. A common form of aftermarket launch control is commonly known as two-step rev limiting. However, if a vehicle doesn’t come equipped with such features, then aftermarket forms of launch control can be purchased and installed. Modern vehicles are increasingly becoming equipped with launch control features available straight from the factory. ![]() After the car is running at a certain speed, the software is disabled. In racing cars, this feature is only available at the start of the race, when the car is stationary in the starting grid. Looking more in depth, launch control holds the engines RPM at a set number allowing for the car to build power before the computer or operator disengages the clutch. ![]() 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. Launch control operates by using an electronic accelerator and a computer program. One version of Nissan GT-R allows user to launch the car by turning the Traction Control to "R" mode. 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 Jaguar F-Type includes launch control. 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). 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, Alfa Romeo with TCT gearbox and certain General Motors products. Motorcycles have been variously fitted with mechanical and electronic devices for both street and race. Launch control is an electronic aid to assist drivers of both racing and street cars to accelerate from a standing start. Switch for activating launch control in the center console of a Porsche 918 RSR.
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