Output Wiring 31
© 2009 Link
Injector wiring for injectors with ballast resistors
Ballast Resistor Selection
If the injector impedance is LESS THAN 2 Ohms, use 2R2 (2.2 Ohm) ballast.
If the injector impedance is between 2 and 6 Ohms, use 4R7 (4.7 Ohm) ballast.
If the injector impedance is greater than 6 Ohms, use no ballast.
It should be noted that injector ballast resistors get quite hot at high injector duty cycles.
Therefore these should be mounted on a heat sink and this should be bolted to the chassis.
Typically ballast resistors should be mounted in the engine bay.
Do not use common 0.25W or 1.0W resistors, as these will burn out almost immediately.
50W resistors should be used. These are relatively uncommon at hobbyist shops, but are
readily available from your Link dealer in groups of 2, 4, 6 or 8 resistors on a heat sink.
8.1.3 Injection Mode
G4 ECUs have up to eight independent injector drives. This means that for most engines
sequential injection can be used. Depending on the number of Injection Drives, the
following Injection Modes may available:
· Single Point Group
· Sequential
· Multi Point Group
· Sequential/Staged
· Group/Staged
Single-Point Group Injection
A single injector (sometimes two) is used to supply fuel for all cylinders. Normally this
injector is placed just before or just after the throttle body. In this mode the injector(s) are
fired once per TDC. The injector should be driven by Injector Drive 1. If two injectors are
used then the second injector should be driven by Injector Drive 2.
Multi-Point Group Injection
This mode should be used if each cylinder has its own injector, but there are too many
cylinders or insufficient triggering to use sequential injection. In this mode the injectors are
fired in two out-of-phase groups with each group firing once for every 360 or 720 degrees of
crankshaft rotation (depending on the Injection Rate setting). Wire each injector to its own
drive or pair injectors if there are not enough drives.
Sequential Injection
To Next Page
Loading...