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R34 Gtt Safc Ground Wire

Firefrog

By Firefrog,
in Engines & Forced Induction

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Firefrog Collaborator

Firefrog

Posted
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Hey guys, currently in the process of putting an SAFC II into my R34 GT-T Skyline, but have run into a bit of a snag. I've found the ground wire (plain black), except a short way out of the ECU it splits, one piece of wire goes along with all the other cables coming out of the ECU (black with white dots) while the other goes up into the dash (black with brown dots) along with another unidentified cable coming from the ECU (white with brown dots).

Doesn't really seem to be enough room to attach both ground wires needed by the SAFC in the short space before the cable splits, so I'm curious if anyone can identify the purposes of the two cables it splits into, and tell me which one to splice my SAFC into?

Did a search too, but most of the info is for R32/33 and doesn't mention anything about the ground wire splitting. Also should note, the car was (to best of my knowledge) 100% stock when I purchased it, so I really doubt that this is some aftermarket gizmo someone's wired into it...

Many thanks!

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Eug Grand Master

Eug

Posted
Posted

maybe its for a turbo timer or something?

running the ground wire for the safc down to the ecu and coming back up to the cd player area is too far. why would you do it, let alone bother. apexi manual says not to chassis ground it anyway

46n2 Mentor

46n2

Posted
Posted

That ground wire is for the safc's afm signal ground and they are very specific in the installation manual about the place it needs to be grounded (to the ECU). Personally, I wouldn't just earth it to just anywhere on the chassis without speaking to someone who has a strong electronic background and can shed more light as to whether or not the quality of the signal will suffer if earthed in this way.

Firefrog Collaborator

Firefrog

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Posted

Yeah, Apexi say grounding it to the chassis is a huge no-no, I think Eug must be right and the 2nd cable is my turbo timer (its about the only thing in the car I haven't done myself, and as such I'd forgotten about it). So we grounded it to the other one, the black one that goes with the rest of the loom, and its perfect, how simple :(

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