OK ive had my loom CA18 loom on the bench with the optical dizzy I spin dizzy I get crisp spark and injector pulse. I havn't got to the point of start up as I have to rebuild the motor first which im starting on now.
Parts you will need for the RB conversion.
An early RB20 ECU that can be chipped. Or what ever Nistune can do if you go that way.
Yeah, the plan was nistune, that way I can tune for different injectors and besides that I should get a pretty decent running motor. I will need either a laurel/cefiro rb20 ecu, r32 rb20 or a VG30ET or DETT as the rb25det ecu is not supported. Should be easy to find on ebay or similar, maybe easier on a skyline forum
The loom from that ECU and intake manifold to raid all the sensors off it. Basically use all of or as many (there is a few you don't need) and adapt them onto the L28E manifold.
I have a friend of mine that has a blown r33 rb25det, he is willing to sell me the maf, cas, throttlebody with sensor and coils. It's a series two so there might be slight modifications required to use an older efi like swapping a couple of wires around on the cas connector and the coils has a built in igniter so I would need to wire them directly without ptu I guess. Wiring harness would also have to be sourced since he had already sold this, again ebay or appropriate forum
I can't stress more find an optical dizzy from an injected L series. This will have 90% of the hard work done for you straight away. Just the oil pump drive might be tricky. But I think that the L28ET (look state side) has this dizzy and oil pump drive.
I have a friend who can operate a lathe so making an adapter for the cas to bolt on to the distributor flange shouldn't be to hard as long as I supply the correct measurements/drawing. BUT(!) you are saying that the signal from an optical distributor will be enough for the RB ecu? And you are correct about the US market 280ZX turbos having an optical dizzy, they got the ECCS system over there whereas here in europe we only got the less advanced EFI system...
Once you have all the sensors on strip all the tape off the harness and plug everything in.
Coil packs you can go a few ways. Buy or make a wasted spark set up for the RB engine and use plug leads. Or make a bracket and run the coil packs like I have done.
I already have the "drawings" for a bracket made up in my head, haha.
Shorten lengthen all the wires you have to and work out how to power up the ECU etc add relays for fuel pump switched earth feed and run the wire for that. Seeing you already have an EFI car it should be so much easier.
Yeah I have the efi and fuel pump relays and wiring already in place since installing the L28ET. Not as intimidated by efi wiring now after the swap as I used to be(Otherwise I wouldn't even be considering this I guess... )
Crank it over and see if it fires.
Use the RB20 MAF sensor and injectors. Crank it over and it should fire. You may have a small issue with injector sizing to get it to start as 2.8L is alot larger than 2L
If you have nistune you should be able to tweak fuel and timing to get it to basically run before it goes for a tune or you start changing things like injectors etc.
Yes, thankfully this is easily adjusted within nistune