G4 Wiring and Installation Manual12
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3 Component Installation Locations
The G4 Engine Management System and associated components may be installed in a
variety of locations but it is important to choose component locations in accordance with the
following guidelines.
3.1 ECU Location
The following items should be taken into account when choosing a location for the ECU:
1. The G4 ECU requires environmental protection for both physical and electrical factors
that may affect its performance. Normally this requires the device to be fitted inside
the vehicle cabin. This position avoids the high temperatures associated with the
engine bay and reduces the chances of the ECU getting wet. This position also offers
some physical separation between the ECU and ignition components that may cause
interference.
2. The main exception to this rule is where the engine is somewhat distant from the
driving position, such as a boat. In these cases the ECU should be mounted in close
proximity to the engine but NOT directly on, or next to, the engine (e.g. mounted just
outside the engine compartment). The idea here is to minimise the length of wiring
between the engine and the ECU while maintaining some physical distance to prevent
heat and interference. It is preferable to have short main wiring and a longer tuning
cable.
3. If water immersion or spray is likely (particularly for marine applications), additional
protection may be necessary. A sealed plastic container may be employed here.
4. Allow sufficient space at both ends of ECU for the main wiring harness and tuning
cables to be connected.
5. A mounting bracket is provided. Install the bracket on a flat surface and clip the ECU
into this bracket firmly. Use only the mounting bracket provided and DO NOT drill
holes in the case, as this will probably cause internal damage.
3.2 Ignition Component Placement
All components of the ignition system have the potential to radiate large amounts of
interference (electromagnetic radiation) that can wreak havoc on sensitive electronic
devices. Therefore it is essential that the ignition components are carefully placed and that
full suppression techniques are used. See the ignition wiring section for further details.
IMPORTANT
Never mount the igniter onto or next to the ECU
Always mount igniter(s) in the engine bay as close to the ignition coil(s) as possible. This
helps to minimize the length of high current wiring between the igniter(s) and coil(s). Avoid
areas of high temperature such as exhausts, turbochargers and radiators since the igniter
itself will generate heat at high power. If vibration levels will be excessively high, some form
of soft or rubber mounting is advisable to prevent component and wiring fatigue. Preferably
igniters should be mounted on the chassis rather than the engine to reduce vibration.
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