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  1. #1
    ajs_saturn's Avatar
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    Slimming Down the Stock Engine Wire Harness (Running on Megasquirt)

    While my car is on jack stands, I decided to clean up some wiring mainly on the OEM engine harness. I'm basically only keeping connectors that work the instrument cluster gauges and idiot lights such as:

    1. B/U switch
    2. VSS
    3. CPS
    4. ECTS
    5. Oil Pressure
    6. Alternator Voltage
    7. Cooling Fan

    I have a question on a few connectors on whether I should keep them or snip them:

    1. Fuel Vapor Canister Purge Solenoid: How important is this one? I know it releases vapor, which seems important, so I'm thinking about keeping it, but has anyone deleted this?

    2. Both O2 sensors: These I'm pretty sure I can get rid of, I have a separate WBO2 already and I doubt they're for much more than emissions.

    3. Knock sensor: I think I can delete this too. I don't know what it does other than detect a knock and readjust timing to correct it, but I'll be running timing off of MS anyway.
    -2001 SL1 5spd. 02/14-present (DOHC swap, boosted @ 7psi, running on Megasquirt 3 v3.57)

  2. #2
    ajs_saturn's Avatar
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    Did some more research...

    1. Getting rid of the purge solenoid completely. I'll just vent the line on the tank side and cap the line on the IM side.

    2. Getting rid of O2 sensors. Don't need them and I'll use bank 1 for my EGT that I'll be installing.

    3. No need for the knock sensor for obvious reasons.

    That will leave just the above listed sensors for instrument cluster informational purposes. Once I've thinned down the harness I will merge it with my MS harness to make only 1 main loom going through the engine bay.
    -2001 SL1 5spd. 02/14-present (DOHC swap, boosted @ 7psi, running on Megasquirt 3 v3.57)

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  4. #3
    Approved Vendor ZombieSatty's Avatar
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    Nice! I hate the idea of the dual harnesses that seem the norm with MS. I understand while getting it set up, but after that, snip snip.

    Sent from my SM-G930P using Tapatalk
    It's not my fault, blame the radiation.

  5. #4
    ajs_saturn's Avatar
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    My initial set up was like that for redundancy. Now I'm changing so much that redundancy is impossible with just a wire harness swap. It should wind up pretty clean when I'm done!
    -2001 SL1 5spd. 02/14-present (DOHC swap, boosted @ 7psi, running on Megasquirt 3 v3.57)

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  7. #5
    ajs_saturn's Avatar
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    This is what's left after de-pinning the excess junk!
    Wire management is going to be so nice!

    20170710_162642-768x1365.jpg
    -2001 SL1 5spd. 02/14-present (DOHC swap, boosted @ 7psi, running on Megasquirt 3 v3.57)

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  9. #6
    Resident Electromotive Expert importsdontlikeme's Avatar
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    Does MS have a knock input? If it does you should take advantage of it.

    On every install I've done I always run the knock sensor into the new ECU. It's especially useful for data logging.


    Sent from my iPhone using Tapatalk Pro

    Interested in a solid engine management system? Ask me about Electromotive engine management.

  10. #7
    ajs_saturn's Avatar
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    Quote Originally Posted by importsdontlikeme View Post
    Does MS have a knock input? If it does you should take advantage of it.

    On every install I've done I always run the knock sensor into the new ECU. It's especially useful for data logging.


    Sent from my iPhone using Tapatalk Pro
    I think you can add it into the daughter board. Doesn't come on the standard MS though. I agree it could be useful though, especially with timing.
    -2001 SL1 5spd. 02/14-present (DOHC swap, boosted @ 7psi, running on Megasquirt 3 v3.57)

  11. #8
    ajs_saturn's Avatar
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    Quote Originally Posted by importsdontlikeme View Post
    Does MS have a knock input? If it does you should take advantage of it.

    On every install I've done I always run the knock sensor into the new ECU. It's especially useful for data logging.


    Sent from my iPhone using Tapatalk Pro
    I think you can add it into the daughter board. Doesn't come on the standard MS though. I agree it could be useful though, especially with timing.
    -2001 SL1 5spd. 02/14-present (DOHC swap, boosted @ 7psi, running on Megasquirt 3 v3.57)

  12. #9
    Approved Vendor ZombieSatty's Avatar
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    See and people shushed me for wanting to ditch the stock pcm...

    Sent from my SM-G930P using Tapatalk
    It's not my fault, blame the radiation.

  13. #10
    ajs_saturn's Avatar
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    They're probably using toggle switches for the rad fan and aftermarket gauges for Speedo, tach and oil pressure.
    -2001 SL1 5spd. 02/14-present (DOHC swap, boosted @ 7psi, running on Megasquirt 3 v3.57)

  14. #11
    Resident Electromotive Expert importsdontlikeme's Avatar
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    I'm pretty sure the speedo is the only one powered by the PCM.

    MS should have a tach output. And GPO's (a fan output)?


    Sent from my iPhone using Tapatalk Pro

    Interested in a solid engine management system? Ask me about Electromotive engine management.

  15. #12
    ajs_saturn's Avatar
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    Yes, I believe you're right. I just choose to used the stock junk. I'm installing a rad fan bypass switch anyway.
    -2001 SL1 5spd. 02/14-present (DOHC swap, boosted @ 7psi, running on Megasquirt 3 v3.57)

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