Split Second Controller Install

Discussion in 'Mazdaspeed 3 How-To' started by JohnnyTightlips, Feb 20, 2020.

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  1. JohnnyTightlips

    JohnnyTightlips Platinum Member

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    The Split Second Controller is use to control additional Port Injection injectors. It uses MAF voltage and RPM to know how much to spray when. The controller is programmed via com to usb cable. It's kinda old school tech but it works well and is much more reliable then meth.

    [​IMG]

    I will not be getting into the software side of this as most don't need to know this as they won't be tuning their own car. Here is some good info on that though.

    Wires:
    upload_2020-2-20_20-53-6.png
    1234 - These each go to the far left side of the coil plug. It does not matter which plug. You will be tapping into the wire. Mine has a plug on it from previous install yours will probably be bare wires.
    6 - This needs to be fused 12v+ ignition on so find a fuse to tap that is only hot when the car is running. Use an add a fuse to make it easier.
    7 - Ground
    8 - MAF Signal - This will tap the MAF signal to be able to read the MAF voltage

    1234 - Here is a pic of where you want to tap , circled in red, you will solder 1 of each of those 4 to each coil connector far left wire. You can either cut the wire and re-solder if that is easier or be lazy and trim some insulation, solder and wrap in electrical tape. It's up to you but be aware if you mess it up you're gonna have a bad time.
    upload_2020-2-20_21-3-14.png

    8 - MAF - Here you will want to tap the middle MAF wire. This wire will output 0-5v MAF voltage
    upload_2020-2-20_21-8-5.png

    The rest of the wires in the harness plug into your PI injectors. Please check the video linked for testing info.

    Plugs that go to PI injectors
    [​IMG]

    Side Note: Take your time, do it once, do it right. If you want to be fancy you can use weather pack connectors to make it so you can removed the unit easily. I am doing it this way as I incorporated it all into the harness when I redid it for my build.


    If you buy the SP63 plug and play harness, here ya go.
    SP63 - Harness

    Red - Plug into existing coil pack wires
    Blue - Plug into coils
    Green - 4 wire coil signal goes to "1234" in the above picture

    If you bought it all second hand and don't have the right connector go here. Otherwise you can solder the wires together.
    Delphi Packard (4 Circuits,) Square Dual 2x2 Weatherpack, Waterproof, Terminal Kit 18 20 GA

    upload_2020-4-28_15-18-33.png
     

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    Last edited: Apr 28, 2020
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  2. JohnnyTightlips

    JohnnyTightlips Platinum Member

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    Here is the map file "with settings" to test out your injectors at idle. You will also use these settings when tuning but will need to change the injector timings as needed for the tune.
    You can see in this tune that the 3ms pulse is the same as Nishans video. You can use this map to do his testing steps.



    upload_2020-4-21_16-25-49.png
    upload_2020-4-21_16-26-12.png
    upload_2020-4-21_16-26-24.png
    upload_2020-4-21_16-26-37.png
    upload_2020-4-21_16-26-48.png
     

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  3. _Mazdarati

    _Mazdarati Resident Asshole Silver Member

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    Soldering connections is the only way to do this install reliably. Butt connectors, splices, etc, are a no go. This is something that is life or death for your car, do it right and take it slow.

    I used these on some connections with awesome results if you don't want to full blown solder and want to take the easy way.

     
    _Mazdarati, via a mobile device, Apr 21, 2020
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  4. JohnnyTightlips

    JohnnyTightlips Platinum Member

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    Updated MAF Power and Ground section

    I stopped doing it this way as it did not seem to have enough amperage past 5500 when they spray really started kicking in. Will confirm after some more testing. I am using the middle wire only now for signal.

    Also to note if you want to tap the MAF for power and ground you can, it already has a fused +12v on it. I ended up making a harness to tap into mine. I had been meaning to extend the maf wires a bit so this was a good time to do it.

    Circles in pic
    Red +12v , Blue MAF Signal, Black Ground
    upload_2020-4-21_17-25-9.png
    upload_2020-4-21_17-26-43.png
     
    Last edited: Jun 8, 2020
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  5. _Mazdarati

    _Mazdarati Resident Asshole Silver Member

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    Oh shit really? I can ditch my add a fuses then and just splice right into the MAF? and a fuckin ground? I didn't realize this. This saves me some wire length for sure.
     
    _Mazdarati, via a mobile device, Apr 21, 2020
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  6. Bigelow

    Bigelow Platinum Member

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    Pulling power from maf wont mess with maf readings?
     
    Bigelow, via a Samsung mobile device, Apr 22, 2020
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  7. JohnnyTightlips

    JohnnyTightlips Platinum Member

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    Not that I have seen. Will from purple drank talked about this setup on facebook a while ago and did not have anything bad to say about it. Eric was also making harnesses for it but did not sell enough so he stopped doing it but he has also not had issues.
     
  8. Bigelow

    Bigelow Platinum Member

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    Good to know. Figured since reading is in voltage and the ssc kicks on at set voltage there may be an issue
     
    Bigelow, via a Samsung mobile device, Apr 22, 2020
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  9. SharksInSpace

    SharksInSpace Planets and shit. Silver Member

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    RIP you shoulda told me this before I wired mine in, lol. Grab a $20 harness extension to splice into and make it totally unobtrusive to the oem wiring system.
     
  10. JohnnyTightlips

    JohnnyTightlips Platinum Member

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    Updated MAF Power and Ground section, right now I am not sure if that power has the required amperage to properly run the SS. I was starting to have issues with fueling up top and I don't think it was providing the injectors with enough power. I switched to a +12v switched that was open in the fuse box and so far results have been better with fueling being more even. I now have the ground going to it's own spot as well and the only thing I am tapping the MAF for is signal.

    According to SS - 16 amps is A LOT , I have it set for a 15 amp fuse right now as most people run 10 without issue.
    [​IMG]

    [​IMG]
    upload_2020-6-8_13-22-54.png

    I double checked and it is also reading accurate maf volts. The SS controller rounds up or down vs showing 2 decimal places.
    [​IMG]
     
  11. Jmeza157

    Jmeza157 Greenie N00B Member

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    Is there an empty one like this on the gen 2?


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    Jmeza157, via a mobile device, Jun 10, 2021 at 12:41 PM
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  12. SharksInSpace

    SharksInSpace Planets and shit. Silver Member

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    2010 here - I used add-a-fuses on the 15a ENG BAR fuse for my SSC, and the 15a ENG BAR 2 fuse for my wotbox
     
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  13. Jmeza157

    Jmeza157 Greenie N00B Member

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    Hey thanks a lot! I’ll try this tomorrow! How long have you had it set up like this? And any issues at all or blown fuses so far?


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    Jmeza157, via a mobile device, Jun 10, 2021 at 1:16 PM
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  14. SharksInSpace

    SharksInSpace Planets and shit. Silver Member

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    I've had it set up and running since last March, no issues at all. You might be able to find empty slots to use if that's your preference (I didn't look), but this has been working for me. I just had to notch the fuse box cover to allow the add a fuses to pass through.
     
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