[PukkaSilvia]

This is a list of pointers for someone who is familiar with basic mechanics


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When fitting the ca18det into a ca18et s12 you can use the:-
same s12 gearbox and bell housing,
same s12 engine mounts in exactly the same location.No mods needed
same s12 car loom.
You need the s13 ecu,loom and loom ancileries ie dropping resistor for the injectors and a s13 power transister for the coil packs which you also need and the 3 green top relays from the s13 engine bay to join your car harness to the ecu harness. These relays are used for the fuel pump and ecu.
s12 power steering and alternator can be used. Cut a chunk out the s12 power steering pump bracket to clear the wider det head or find a s13 bracket
The s12 exhaust is compatable. Use the s13 manifolds and turbo & downpipe. You could use the s12 turbo and downpipe but it really is too small#

When wiring in the s13 ecu loom you will see that there is a big plug spare by the ecu and another further down the loom near the air flow meter.These used to connect to the s13 car harness.You need to reconnect some of these to your s12 system.

The connections you need to make are listed below with there wire colours.
BY AFM

Black / Pink stripe
Fuel Pump Relay

Red / Black stripe
ECU Relay

Red
ECU Backup Power

Black / Red & Blue / Red (Note: connect 2 wires to 1)
Main Ignition Power

Black / White stripe
ECU Power

Brown (to O2 sensor)
O2 Sensor Power
Any 12v switched source

white plug

Yellow / Red stripe
Tachometer signal

Orange
Ignition start

Black
Ground


Blue / Black stripe
Water temp signal

The s12 and s13 have 2 looms. A engine loom and car loom. all you essentially are doing is swapping the engine loom over and then powering it up.
You can use the s12 fuel pump but its advisable to uprate it as it will probably run lean under load/boost. You need to change the wiring for the pump round so that it has the new ecu + feed via a green relay and a constant body earth rather than the old s12 wiring that was earth switched.