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Old 02-12-2016, 04:05 PM   #1
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Default Electronic Boost control from unused wire in loom

I just got my EBC in the other day from DIYautotune. I want to wire it in but what I see most people do is connect P6T to boost control in and boost control out to one of the DB15 pins. I want to avoid using P6T if I can so I can run sequential injection later on.

I really don't want to run a wire into the DB connection in front of the MS so I was wondering if anyone has used something from the stock wiring harness to run boost control. That way the install looks nice and clean. I have a 90 1.6L car without AC or PS, has anyone tried to wire their EBC in like this?
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Old 02-12-2016, 04:26 PM   #2
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Yes you can run it through any unused wire in the engine bay that goes back to the ecu. You would just need to hook up the corresponding wire at the ecu to whatever output you set EBC to. I don't know 1.6 cars off the top of my head so I can't really recommend what wire to use. Maybe something in AFM connector.
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Old 02-12-2016, 04:36 PM   #3
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Evap purge solenoid has 12v and a switched ground wire at the ECU.
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Old 02-12-2016, 04:37 PM   #4
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Quote:
Originally Posted by shuiend View Post
Yes you can run it through any unused wire in the engine bay that goes back to the ecu. You would just need to hook up the corresponding wire at the ecu to whatever output you set EBC to. I don't know 1.6 cars off the top of my head so I can't really recommend what wire to use. Maybe something in AFM connector.
That would be great if I can use one of the AFM wires for this. It's close enough that I could easily hide the wires and mount the EBC in a coolish location. If I was more confident in my ability to read a schematic I would do the leg work on finding an unused wire but, my electrical ability falls short of my mechanical...by a good margin.

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Originally Posted by Deezums
evap....
Do you know which wires those would be at the MS connection by chance? That would be good to use since I don't have it in the car anymore.

Last edited by 90civichhb; 02-12-2016 at 04:56 PM.
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Old 02-12-2016, 04:50 PM   #5
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So I think I found it. It's a yellow wire labeled 2x on this diagram.


So in the Megasquirt itself how do I identify where this wire is pinned?

Here is the .PDF in case you can't see the hosted jpeg. http://www.miata.net/garage/ECU%20Pi...90-93%20MT.pdf
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Old 02-12-2016, 04:51 PM   #6
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What MS do you have?
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Old 02-12-2016, 04:54 PM   #7
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DIYPNP
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Old 02-12-2016, 04:58 PM   #8
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Quote:
Originally Posted by 90civichhb View Post
DIYPNP
So factory ECU connectors right?
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Old 02-12-2016, 04:59 PM   #9
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Right
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Old 02-12-2016, 05:02 PM   #10
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It's wired as 4X on the jumper board inside the DIYPNP for a 1.6 miata.
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Old 02-12-2016, 05:07 PM   #11
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So will the wiring look something like this...

Inside Megasquirt
4X to Boost Control Out
IAC/PT6/PA0 to Boost Control In

Inside Car
Polarity isn't important with the MAC valve so..
Yellow wire from purge valve to one wire on the MAC valve
Other wire on MAC valve to any ground


Is this correct or is my understanding wrong?
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Old 02-12-2016, 05:09 PM   #12
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No, the megasquirt is a switching ground in this application. The other side of the valve must be wired to 12V. That's why the purge valve is cool, it is an ECU switched ground wire and a 12V wire off the main red/white engine feed.

Or you could wire it to ground, just won't do much at all.
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Old 02-12-2016, 05:14 PM   #13
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Oh, interesting.

So both the wires going into the purge valve can be used here by just hooking them right up to the EBC (red/white and yellow wires)? I am assuming that the wiring inside MS was correct in my post though?
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Old 02-12-2016, 05:18 PM   #14
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Yep, that's it.
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Old 02-12-2016, 05:19 PM   #15
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You're my hero.
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Old 02-12-2016, 07:05 PM   #16
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I always wire it through the AFM/MAF connector on my MS setups since 9:10 people put the EBC solenoid near the wastegate.

power can be tapped at the diagnostics box or the blue power connector.
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Old 02-12-2016, 07:17 PM   #17
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Not that I've ever heard of anyone having a problem before, but the DIYauto valve is only rated at 122f/50c.

Quote:
One wire connects to a 12 volt source, the other to the Megasquirt, the valve wiring is not polarized so it does not matter which wire you run to 12v+ and which to switched ground at the EMS. It is NOT recommended to mount the valve in a direct, extreme heat source so, if you can, mount it off to the side of your engine bay keeping maximum valve temps at or under 122*F.
Since you should always source the wastegate source after the intercooler, as close to the throttle body as possible it just made sense for me to mount it off over there, near the throttle body on the cold side.
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Old 02-12-2016, 07:25 PM   #18
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I also put it in the AFM connector.

With ebc the location of the wastegate source doesn't matter.
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Old 02-12-2016, 07:40 PM   #19
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What connection in MS do you make for the AFM to run it? I forgot about the blue power plug. I could just put a spade connector on it and wouldn't have to chop into my harness that way. I only use the blue connector to check timing anyway and the EBC can be open for that.
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Old 02-12-2016, 07:41 PM   #20
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I used the maf wire i believe
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