launch control is a subset of traction control as it comes into effect when the car is stationary. ie when wheel speed is zero if you floor the throttle the rev limiter is now reduced to a low limit of say 4000rpm. once you release the clutch and wheel speed goes up, it will cross over to traction control at some point.
all motecs have it but you need to pay to have this feature enabled. any ecu which controls ignition can do this as it essentially retards the ignition to cut power.
however, in order for the ecu to detect wheel slip, you need at least 2 wheel speed sensors, one on a driven wheel one on a trailing wheel.
in my personal opinion, its better to try to limit power on lower gears as you prevent wheel spin, rather tha n try to reduce it after it has already happened via traction control. cutting ignition in and out shakes the engine quite violently and is not ideal for highly stressed engines.
