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  1. MKIV (1993-1998)
    Below is a picture of my ECU. I just got my JDM Mark IV Supra about a week ago and I’m still trying to figure out what all it’s got done to it. Short story. What ECU is this? I couldn’t find anything in the competizione brand and I need a wire diagram. Long story: I have a gen 4 HKS EVC that...
  2. MKIV (1993-1998)
    With our cars getting older and the factory TT harness being long discontinued, what are our options for wiring harnesses these days? I have heard a lot about Tweak'd over the years, but it seems like there might be some negative experience with them. Has that changed? Has anyone tried...
  3. MKIII Technical
    Hey, what are some of they key differences to determine if an extra wiring harness I have is a turbo or NA wiring harness? Which clips do one have that the other doesn’t?
  4. MKIV (1993-1998)
    Hi, I have an AEM V2, had a dead igniter module, so I switched to ign1a coils. Need advice for the wiring !! Looking at the wiring diagram from saad and the one from the igniter (attached files): My understanding of the coil wiring: A: is Ecu trigger wich is 1/2/3/7/8/9 from my igniter...
  5. MKIII (1986.5-1992)
    I've been working on this for quite some time now. I made this as a thank you to the community, and I hope it helps some people out with their wiring. The plan is to update this as I can. There are some bits of information missing, such as connector numbers and some wires are not labeled. If you...
  6. MKIII (1986.5-1992)
    Hey all, I’m wondering if there’s anyone around that’s still doing wiring harness rebuilds. I know I’ve got bad knock sensor wiring, and I’m interested in maybe going ahead with a rebuild of the harness. I’ve got an 89 Turbo M/T if it’s important. Thanks.
  7. MKIII Technical
    Look ill be honest I really need help the car was stiped when I got it all the wiring so now im lost on how to wire it back up its for drifting only and I want to use the stock ecu is there a way to make a new harness for everything or do I need to splice it together ( 86 engine harness and ecu...
  8. MKIII (1986.5-1992)
    I am currently attaching all of my connectors and grounds on my '87 turbo and I am assuming that these two wires are grounds but they have a wire inside of the outer wire. I don't know what I should do with these wires now, any advice and tips as to what I need to do? I am very new to electrical...
  9. MKIII Technical
    Ok I have no idea how to replace the headlight wiring to the h4 wiring. I have a 1986 Toyota Supra, and I just ordered new halo headlight with h4 led lights and wiring harness but I have no idea how to replace it. Also do I gotta replace all the other wiring for the signals or fog lights? (Btw...
  10. Supra FAQ
    I’m using a 2JZ GE out of my friends 93 MK4 but am doing a turbo conversion And putting it in my 74 Datsun 260Z. My question is do I have to use a universal wiring harness from Haltech (using a Haltech Elite 1,000 ECU) and wire It up myself OR can I use a GTE wiring harness and use the Haltech...
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