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Launch Control: Input Configuration

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Input Configuration

01.37

00:00 Regardless whether you're using a digital switch or a speed sensor to define when the ECU will enter launch control.
00:06 The first step is always to ensure that the inputs are correctly configured and giving the right reading.
00:13 This is relatively straightforward but it still needs to be checked and confirmed before moving on.
00:19 The simplest and most common trigger for a simple two step launch control system would be a digital input.
00:26 This is a pretty basic type of input but you'll need to ensure the ECU is configured for this.
00:32 Part of the sit up will include enabling or tuning on the pull up resistor to allow the ECU to determine when the switch is in the open or closed positions.
00:42 You'll also want to check the polarity of the switch is correct.
00:47 By this I mean that the ECU is seeing the input as active, or on, when the input is switched.
00:53 If you're using a speed sensor to define when the car is moving, this will need to be configured and correctly calibrated in the ECU.
01:01 This is a case of defining the number of pulses per revolution of the wheel and then taking into account the rolling diameter of the tire.
01:10 I always find that the dyno is the best place to accurately calibrate the wheel speed sensor.
01:16 While we'd like the calibration of the speed sensor to be accurate for this particular type of launch control, we're only really worried about whether the car is stationary or moving so the actual calibration isn't critical.