Can someone identify some information about RB25DET S13 Swap

[GIJOE69]

Hello once again sorry I am bugging you guys but I was wondering which portion is the upper and lower harness ? lower = engine and is upper the whole harness to the ECU ? also is anyone using the RB25DET R33 SMIC in there S13 240? thanks

[gawdzilla]

i know for my 26(should be the same w/ the 25, at least very similar), the upper harness is the ECU plug, the THICK bundle of wires which goes to the plugs, injectors, mafs, o2 sensors, battery connection, etc.

from what i can tell, my lower harness has knock sensors, oil temp sensor, and 2 unknown plugs.

ppl suggest using the lower harness of the KA and adding the new wires from the RB onto it, to keep gauges and lights.

[gawdzilla]

i think altnerator and starter are also off the lower, but im not positive.