Am I missing something! Engine conversion wiring

["Z" UTE]

My sparky has been absent for a while so I decided to drag out the diagrams and his notes to see where we were up to. He seems to be consumed with the minor details of the ecu wiring and has not really sorted the main things I need. He has at this stage sorted and labelled every earth and all the ignition and all the injectors wires. These would be essential if installing an aftermarket ECU. For plug and play of an existing manufacturers engine loom and ECU,

Surely all I need for engine start is:

Fuel pumps, Ignition, EFI main, and crank,

For instrumentation, from the ECU a tacho signal

For warnings and indications simply plug the cars loom into the water temp sender and oil pressure switch.


So am I missing something?

cheers Chuck

[big_zop]

While I havent done a proper engine conversion, logic dictates that as long as you cover the appropriate inputs/outputs that are separate to the engine loom then it should run - ie the bits you mention and not the injectors, ignition ect. Though what engine are you looking to fit and into what car?

Items to also consider:
- Speedo - normally comes from the cluster to the ECU, not normally important for a manual but essential for an auto
- Some warning lights I have seen go directly from the relevant sensors to the cluster and not through the ECU, as in there will be a body loom connection from the engine loom which will have all these wires and will need to be matched up. Some others are referenced like stop light signal. Warning lights from the ECU are generally Check Engine, Cat Temp (if relevant), Auto position indicators unless the Auto ECU is a separate unit.
- Crank is normally only a signal that the engine is starting to make sure it fires the injectors, ensure any Neutral Start Switch is connected if relevant (if the engine and trans are from the same donor then this will be covered in the auto connections)
- AC clutch control, again if relevant

[dumbass]

I would seriously change sparkys if they have spent hours just labelling wires
find someone who knows what the wires do without needing to label them
especially earths they are the easiest wires to do
anyway what is the engine what is the ecu and what is the car its going in

[wilbo666]

Check my wiki (www.wilbo666.pbworks.com), for some of the xJZ engines at least I have gone through and detailed the engine to body loom plugs... Might be of some help / give you some idea...

Cheers
Wilbo

["Z" UTE]

Thanks guys, my sparky only costs me a few cups of coffee now and then, so not really complaining. Just thought I might be abler to make some headway myself before his next visit.

Total engine and auto trans install, donor car is Lexus GS300 being fitted to the most basic of all Crowns the ute. Fuel pumps and surge tanks fitted, will use COR or gasFUZE to control them.

big-zop , I will have to see where the ECU picks up the road speed input, as I will be running a GPS speedometer, might have to fit up a signal generator to the auto trans.

wilbo, heading over to your info now, thanks for the link.


cheers Chuck.

[kiwi]

Hi Z.

While I have never worked on a Z engine I have done 3 engine swaps.

With my 82, when I did the silvertop/Blacktop loom ecu into it I laid everything down on a large peice of wood, uses small nails as guides and ran the whole engine/interior loom I was going to use, marked it all out and made the changes I needed to do and any additions (such as MAP sensor and TPS) and wired it all up, that way when I put it into the 82 it was all done and it was a plug and play affair.

Did the same when we put a SR20det into the Escort, built the custom engine loom the same way, wired it all up, messured the lengths we needed, made it all on a large board, then plug and played.

Not sure if this helps or not.

[dumbass]

What year is the gs300
The later model ones have security in them
I had to sort out security in a 2001 2j from an is300

[maccac__1590]

not that i have done much fuel injected stuff (most hectic re-wire/conversion i have done is a 351 in a xy falcon), but from the mucking aorund i have done you will also need all the little stuff like water temp, throttle position, oxygen sensor, knock sensor, air sensor, crank and cam speeds and gearbox output speed for the auto side of things (maifold air pressure or hot wire) for the computer to calculate everything correctly to give you the right outputs, injectors and ignition and auto box gears and stuff, so it dosnt throw fault codes or go to limp mode

[trdee]

A lot of those things will not need to be touched if you are using the complete engine loom and ecu for the donor engine. you just supply the engine loom with battery power and ignition power in the designated spots and everything else takes care of itself engine wise. Body wise you need to connect up the charge light, starter motor and instruments (which may or may not be compatible depending on the engine/car combination) and you are good to go..