3.20 Tachometer
A tachometer can be connected to the harness wire marked
“Tachometer Out”. NIRA i7x, pin v.91, outputs a tacho signal similar to a
normal distributor-based system. The pulses are 12 V and can be used to
control most tachometers on the market.
3.21 ALS Solenoid
For the Anti Lag System to work, some sort of mechanism that can increase
airflow to the engine is needed.
One method is to attach a solenoid to the throttle shaft and have the
solenoid open the throttle somewhat. Another method is to add some sort of
valve, which allows air to enter the intake manifold after the throttle plate.
This is analogous to the function of an IAC valve.
If a separate mechanism is used, connect the positive terminal of the
mechanism to Main Relay kl 87 and connect the negative terminal to the wire
marked “ALS Solenoid, on=gnd” in the NIRA i7x harness. NIRA i7x can sink
up to 2A on this pin.
3.22 Wheel Speed Sensors
Four wheel speed sensors can be connected to the ECU to
detect vehicle speed and be used for traction control. The
speed sensors need to be of the type Hall Sensor. This is not
prepared in the wire harness and needs to be added by the
user. Contact your supplier for NIRA i7x connector pins.
Before connecting supply to the hall sensors it is important to know how
much current the sensors draws. This is often stated in the datasheet that
comes with the sensor. Supply can be connected either on E. 7, E.28, V.16 or
V.17. The sensors together should not draw more than 60mA on all the ECU
pins suggested.
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