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#1
20-06-2006, 21:55
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S12 ca18det conversion brief pointers
This is a list of pointers for someone who is familiar with basic mechanics
-------------------------------------------------------------------------------- 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.
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Last edited by PukkaSilvia; 16-04-2010 at 12:45. 
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#2
24-07-2006, 19:10
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good job !
Thank you pukka 
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www.clubS12france.com
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#3
24-07-2006, 23:53
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i still cant get the s12 tacho working in mine. my tuners tried everything.
had to use an after market rev counter. any ideas...
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if it's got tit's or wheels, it's gunna give you grief.! 
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#4
30-09-2006, 00:34
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use the S12 gearbox
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www.clubS12france.com
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#6
30-09-2006, 15:26
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Rev counter
I assume its the Rev counter your on about, excuse my lack of tech jargon. If this is the problem then its a sensor located just by where the air intake pipe joins the air flow meter. there is a sensor attached to the loom here & it tends to get corroded. Check this or replace, I think this should cure your problem. I think Silviagod has a pick of this somewere on his web pages.
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#7
13-02-2007, 10:48
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Quote:
I got it working on my mates bluebird. You'll need 4 thick diodes from maplins. The smaller ones allow the current to go the other way and the car won't start. Tap a wire into each coilpack. There are 3 wires, when looking at the back of the plug, its the left one you need. From each wire put in line a diode so the current can only flow away from the coilpack. Then join all 4 wires together into one and take them to the original wire that feeds the rev counter. This could be found behind the dash (don't know the wire buts it probably blue) or if you still have the original section of loom in the car take it to the connecting plug that connects to the S12 coil earth. Its a single wire plug, the wire is blue.
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