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ECU Wiring - patch into factory loom or separate loom?

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    ECU Wiring - patch into factory loom or separate loom?

    In the near future im going to need to wire up an aftermarket ECU to the MX5. Now i was originally going to use the stock loom and simply add a few extra wires to it to run additional things. However, as im tallying it up its looking like the additional loom will be almost as large as the stock one and would only take a couple of extra wires to make it a separate loom.

    At the minimum I'll have to add to the stock loom extra wires for sequential ignition and injection (4 wires min), fuel pressure and temp, oil pressure and temp, flex fuel and boost control.

    In addition the stock loom has the air temp sensor on the wrong side of the engine, and has a weird separated loom for the injectors and ignition that ill have to splice into to add the sequential control.

    Starting to think that a standalone engine loom (like on 99% of cars) is the way to go, and just tuck all the stock wiring out of the way. That way i would be patching only a handful of wires into the stock ECU wiring (+12, acc, gnd, and fan).

    Apart from removing all the wiring from the car and unlooming the entire body wiring to pull out the ECU wiring, can anyone think of a better way to do this?
    Chris
    ------
    The new nugget
    I never saw a wild thing sorry for itself. A small bird will drop frozen dead from a bough without ever having felt sorry for itself. - D.H.Lawrence

    #2
    If you've got a decent ECU it will pull the fuel temp from the flex fuel sensor, so no need for an additional fuel temp sensor. If it was me I'd take a stock engine loom and strip it to bare bones so it just contains the factory power feeds etc, then add a long flying loom for your ECU of choice and terminate at the engine side with new plugs/pins

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      #3
      Originally posted by jasonp1977 View Post
      If you've got a decent ECU it will pull the fuel temp from the flex fuel sensor, so no need for an additional fuel temp sensor. If it was me I'd take a stock engine loom and strip it to bare bones so it just contains the factory power feeds etc, then add a long flying loom for your ECU of choice and terminate at the engine side with new plugs/pins
      Chris
      ------
      The new nugget
      I never saw a wild thing sorry for itself. A small bird will drop frozen dead from a bough without ever having felt sorry for itself. - D.H.Lawrence

      Comment

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