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Motor Swap

Discussion in 'SN-95 and New Edge Mustangs' started by Massie02GT, Apr 2, 2020.

  1. Massie02GT

    Massie02GT Active Member Established Member

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    Well it’s that time. Within the next few days my “new” 04 Cobra motor will be delivered, and I’m trying to plan out the swap in my head.

    To those of you that have done this swap: what wiring did you use? The motor is coming with the engine harness, but no ECU. Can the engine harness plug into my GT ECU and function properly? If not - what steps have to be taken to use the GT wiring to make the 4v work? I know I’ve read that polarity must be swapped, I just can’t remember if it’s the COP or the injectors, or both. Also I know I’ll have to extend some wiring, so which gauge wire should I use for that?

    Overall I expect this swap to be pretty straightforward, but who knows. It’ll be my first motor swap experience. Thankfully I’m on no real timeline.
     
  2. Twisted2v

    Twisted2v Active Member Established Member

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    Pretty sure the COPs have swapped polarity. Don’t think it would run with a GT computer though.
     
  3. Massie02GT

    Massie02GT Active Member Established Member

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    Wherever the gov't tells me.
    Why wouldn’t it? If the COP polarity is swapped and the entire GT harness is there, it would be just like uploading a tune for a supercharged motor.
     
  4. Twisted2v

    Twisted2v Active Member Established Member

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    Just seems like more potential hassle to not buy the right ecu with the right baselines. I feel like something like GT injector pulses could easily throw off the A/F ratio. Is everything like IAC, TPS voltage the same?
     
  5. richmustang1880

    richmustang1880 Member Established Member

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    you should stick with the gt harness make the couple changes and just get it tuned.

    im doing aa termi motor swap right now but i am swapping to the complete cobra harness but i have done a couple b/c head swaps into gt's and used the gt computer each time. If i didnt want the cobra cluster and to plug everything straight in i would be using the gt harness in my current swap.
     
    Massie02GT likes this.
  6. Massie02GT

    Massie02GT Active Member Established Member

    Messages:
    884
    Joined:
    Feb 1, 2011
    Location:
    Wherever the gov't tells me.
    I appreciate the info.

    As of now, it looks like the motor will be making its way across country to a new home.
     

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