The system works by monitoring the speed of all four wheels using the ABS system or specially fitted sensors. When wheelspin is detected the engine power is reduced, by cutting a single injector pulse or a spark, until grip is resumed. This occurs in a thousandth of a second, and appears to the driver as a slight miss-fire with no loss in acceleration.
Maximum acceleration is achieved by limiting the slip between the tyre and the road. The point at which a tyre is just beginning to slip against the road gives the maximum coefficient of friction value.
Launch control is a function within the Traction Control system designed to automate standing starts to maximise the initial acceleration.
It is activated by pressing a button on the dashboard when the car is stationary. This will bring in a secondary rev-limit (for example 4000 rpm).
The throttle can be fully depressed without over-revving the engine. The car is put into gear, the throttle floored, and then the clutch is engaged, whilst the launch control system controls the wheelspin and revs for the perfect start.
On a turbo car, if the launch control is active, and full throttle is given for two to three seconds, the boost pressure will build up before the clutch is released, resulting in stunning off-the-line performance.
The launch control rev limit can be programmed via a laptop computer or by a combination of presses on the launch control button. This is done by pressing it once, and then once again but this time holding it in and raising the revs to the desired level, then the button is released, setting the new rev limit to this level. This makes it very easy to re-program the launching revs just before a start if conditions suddenly change.
There are various parameters you can tune if you want to get the last little bit of acceleration out of the system. You can have two switchable levels for wet and dry, the level of wheelspin at which the system swaps from Launch Control to traction Control can be adjusted, and on the professional system you can even switch to a lower limit once the car starts to move.
The full throttle gearshift system is activated by a switch fitted to the clutch pedal, either a hydraulic switch or a mechanical switch. Once the clutch is depressed, the system automatically drops the engine revs down by using a momentary rev-limit, allowing the next gear to be selected without lifting off the throttle. Because the throttle is always fully depressed, the engine is instantly back on full power, and on a turbo car the turbo is still producing boost. Tests have shown up to 0.1 seconds can be gained per gearchange.
Full throttle shift is a firmware upgrade available either at time of purchase or subsequent to fitting.
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