Basically B series come in OBD0 (early 90s), OBD1 (mid 90s) and OBD2 (late 90s+) ecus. OBD1 is the best if you want to go a custom tune.

So basically an ecu will have plugs into it, and those plugs goto sensors of the engine. The Vehicle Speed Sensor is in the gearbox and gives out the speed, which goes to the ecu, then from memeory goes from ecu to the cluster/speedo.


If you want to use the mini loom, you will need to get a honda loom, and cut all the plugs off for the sensors and then use the wires from the mini loom to connect the sensors to the ecu. I would say just use a honda loom and shorten/extend the wires where necessary.


For wiring diagrams, google for honda workshop manuals for the cars you plan to get the engine from... they are produced by honda and show wiring diagrams, including pin outs of the ecu. Pretty much all 90's hondas are fairly similar with their ecu's and wiring setup.. a handful of differences depending on car and what sensors are on the engine.

google 'honda obd1 pinout' etc too..


i dont know shit about mini installs.. but intuatively i would get the whole engine and dash loom and fuse boxes from the donor honda.. and basically remove everything not needed.. like AC etc.. and then just install it all into the mini.