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Thread: 89 2.5 Turbo into 91 TBI Shadow - wiring and electronics

  1. #1
    Mitsu booster
    Join Date
    Aug 2021
    Location
    Missouri
    Posts
    5

    Question 89 2.5 Turbo into 91 TBI Shadow - wiring and electronics

    So I am building an engine for my 89 Spirit, 2.5 Turbo. I've found a 1991 Shadow ES convertible that seems to me would be a great car to put my 2.5 in instead of the Spirit. My only qualms are in the electronics department. Fairly new to TD stuff, this Spirit (or will it turn into a Shadow?) is my first build.

    As I see it my options are thus:

    1. Put my turbo engine and trans into the Shadow, keep the Spirit SMEC and engine wiring, figure out how to connect into the body wiring on the Shadow. Really hoping I can make this work, but I'm not sure what would change not having an SBEC. Not sure from other things I've read if this Shadow is going to have a body module or something inside the car as well that would go crazy if it didn't hear from an SBEC.
    2. Put engine and trans in Shadow, make the N/A SBEC work with my engine. Obviously it's not currently set up for four injectors (I think). Don't know if it has provision for that though and would just need wires + tuning?
    3. Other suggestions from those wiser than myself in these ways?

    I'm having a hard time finding posts on this, and most I do find are quite old, not sure if advancements have been made since then.

    I have an MPFlash SMEC module I already bought for the Spirit engine controller, would like to use it but this is a project car, a little extra money for an SBEC module from them isn't out of the question if necessary.

    Criticism, comments, all is welcome. Glad to be a part of this community and looking forward to hear from you all.

    Thanks in advance.

  2. #2
    Supporting Member Turbo Mopar Contributor
    Join Date
    Feb 2015
    Location
    toronto
    Posts
    1,770

    Re: 89 2.5 Turbo into 91 TBI Shadow - wiring and electronics

    the NA SBEC is not going to work with a turbo as it is missing hardware.
    option #1 will work but a crapload of electrical work. I converted my 87 LM/PM to SBEC using a 91 engine harness. I also made a SBEC to SMEC adapter so I can run both ECU as I please. Currently running SMEC.

    This leads me to next comment. leave the SBEC engine harness inside remove the SBEC pins from the 60 way and repopulate the SMEC 60 and 14 way connectors. Of course, you wlll need to add a few extra wires to the harness such as WG,detnotation, injector harness to ECU. I have a spreadsheet with the wiring matrix, if you decide with this route.
    www.minimopar.net http://minimopar.net/ecu/index.html
    Regards,
    Miles

    DD '87 Sundance T1, SLH with rear disks
    '87 CSX #432 2.5 CB TII, SLH

  3. #3
    Mitsu booster
    Join Date
    Aug 2021
    Location
    Missouri
    Posts
    5

    Re: 89 2.5 Turbo into 91 TBI Shadow - wiring and electronics

    SBEC harness adapted to SMEC ECU seems to be the best option then - many thanks for the wisdom and resources. Hoping I can get this thing bought now and use it.

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