R34 Gtt Neo Rb25det Wiring Info For Conversions

[DJRIFT]

Ok so ive put this in this section as i was un able to post in the DIY FAQ section and am very grate full that i didnt loose this in the process of finding that out so please move this to a relevant space

Second this info is to be used at your own use and i take no responsibility for any of this info being incorrect. use it at your own risk.

So after searching all over the net i realised its near in possible to get any wiring info for the R34 GTT RB25det Neo engine. I recently Did the wiring conversion in an un-named car for a customer/friend and this is the information i pieced together and put into action to make the Neo engine run off its own engine management. when we started we had no idea if it would work given the lack of inputs we had to use as far as sensors for the traction control and other other possible issues faced with the R34 GTT.

First off my example is i was given a car with a Rb25det Neo engine with its original engine wiring loom and ecu. No R34 dash loom or other wiring was supplied. the info i will post is the parts i needed to wire in to get the car to start and run on the factory ecu. The engine was never checked on a dyno to make sure everything was sweet but its pretty easy to tell.

I am also not sure if you plugged into this newly modified loom if a plug and play ecu would work. i can not see why a Apexi power FC of a haltech plug and play would not work but we did not go as far as to test this and i no longer have access to the car to try any of the above.

What you need to start with is the ECU pin out and the basic engine management wiring diagram found in the R34 GTT work shop manual that is floating around the web. If i get a chance i will update this thread with the 3 pages i had to work with whist doing this.

Basic wiring

Wires that need Batter positive.

White / Black

White / Green.... both of these wires are found in a plug on the engine side of the the fire wall Grommet. they splice off just near the fire wall grommet. these wires need a 10A fuse each. They both go to the ECM and Ignition coil relay and also supply power to pins 80 and 109 of the ECU plug

Yellow / Red... this wire will be found on the inside of the fire wall grommet (what would usualy be inside thecabin of the car) and goes to the main Ignition Relay. this needs to go through a 50A fuse link.

Wires that need Ignition (key on) supply

Dark Green... this wire will be found in one of the inside "dash" plugs. it needs to see Ignition via a switch (key) and turns on the main ignition relay.

Un known colour..... Pin 24 on the ECU plug needs an ignition Feed through a 10A fuse. the wire coming out of Pin 24 is Common to the power side of the injectors so do not cut this wire out of the loom. if you find you have no power to the injectors please trace that wire back and put power on it (un known colour)

Wires to put to ground

un known colours.... ECU pins 25, 32, 115 and 124 all need a direct body earth.

By this stage if you mark the supply types onto the ECU pin out diagram you should end up with Batter on pins 80 and 109. Ignition on pins 4, 24, 31, 64 and 72. And Earths on 25, 32, 115 and 124

that will get the engine running provided all things like crank angle sensor map sensor ect are plugged in and working fine.

Other handy to know pin outs and wire colours.

Pin 13 Most important. this output is the ground signal used to turn on the fuel pump relay.

Pin 20 Start feed from Key.

Pin 5 is Tacho out put. Be carfull with this. the tacho output is week and will not drive a standard off the shelf after market tacho. the dash in the R34 GTT is electronic and does not need to see the same voltages that the average tacho works off. i would expect that digital tachos such as the Apexi RSM should work. VDO also do a tacho that will run off it and if you can find a VDO workshop in Aus near you they can modify a stock tacho using VDO parts.

Gear box wiring.

Orange and Black wires = speed sensor. Unsure of wave form but once again they should work on an Apexi RSM.

Red and Green / Yellow = Reverse Light Switch

Yellow / Violet and Black = Neutral switch. even the manual boxes have a neutral switch which and be utilised when wiring remote start and turbo timers to stop andy in gear accidents.

Ok so i hope that has helped in some way. im more than happy to answer questions but like i said at the start i no longer have access to the car so i can not check anything elce. i have no idea what any other wires ect do or go as the job did not require me to work them out or wire them in.

the car has been running fine for quite some time now with no drams and i will update this with further info if i come across it.