Radiator Cooling Fan Relay(s)

As the ECU reads the engine coolant temperature it can also control the radiator cooling fan. The fan temperature can be set in the ECU. Many vehicles will have a radiator cooling fan relay in the chassis wiring so we have in our standard wiring harness a trigger wire to control this relay. If your chassis harness does not have this relay we can add one to the ECU wiring harness.

If you have a twin speed or double fans we can add a second control wire or second relay to control the second speed / fan. The second speed / fan can be set at a second independent temperature to the first fan.

Many vehicles will have the radiator cooling fan controlled by a thermal switch in the radiator. This is fine to use, the ECU does not have to control the fan, but using the ECU to control the fan gives you full control so you can run the engine at the temperature you choose.

Fuel Pump Relay

Many vehicles will have the fuel pump relay already in the chassis wiring so we have in our standard wiring harness a trigger wire to control this relay. If your chassis wiring does not have this relay, we can add one to the ECU wiring harness.

At ignition on, the ECU runs the fuel pump for 2 seconds to prime the high pressure fuel system. It then runs the fuel pump whenever the engine is running and turns off the fuel pump when the engine is not running to prevent battery drain and to prevent fuel heating.

Shift Light

If you are improving the performance of your engine through fitting ITBs then you will want to make make sure you are using all of the new performance. Fitting a shift light means you will be prompted to make your gearshifts at the right time, every time. Many drivers think they can do this by “listening to the engine” or watching the rev counter, but professional race drivers worldwide use a shift light. If they need one, you probably do too!

Launch Control

Hold the button on for a temporary lower ignition-cut rev limit that you can set in the ECU. If you already have a button on your steering wheel you do not need to use the Omex button, you just need an extra wire to the ECU which is supplied in the package. Known as 2-step launch control, you will get consistent, controlled launches.

Full Throttle Gearshift

The ECU can retard the ignition to reduce torque output of the engine during an upshift meaning you can keep the throttle wide open. On an “H” pattern box the ECU needs to see when the clutch is pressed so we can supply a clutch switch for this. If using a sequential gearbox there is usually a switch in the gearbox or an output from the paddleshift controller for the same job and you just need an extra wire to the ECU which is supplied in the package. Speed isn't just about power, get faster gear changes for faster lap times.

Rev Counter

Modern rev counters are designed for triggering from an ECU output so we have a wire from the ECU for this. If you have an earlier rev counter that was triggered from coil negative you will need the “Tacho Driver” to boost the signal from the ECU.