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Old 05-11-2014, 12:06 AM   #1
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Default Unknown piggy back identification help?









This piggyback setup runs pretty good, but I've had megasquirts in the past and would prefer it.... so I am going to throw this piggyback setup up for sale.

Its pretty neat, I dont know if there is an O2 clamp off hand but there is a boost control circuit that ties into the factory wiring on the pass side of the car?

The piggyback part of plugs into the AFM... It has a vac line going to it (I assume map sensor), and an IAT that goes to a GM sensor in the charge tube.

The dash has a micro headphone jack that runs to the ECU, 2 wires.
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Old 05-11-2014, 10:22 AM   #2
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never seen anything like it.


looks like it mods the AFM signal to be able to alter fuel. Possible the voodoo? I've actually never seen one.

stock injectors; is there an FMU? what tee's off the FPR in that first shot?


whomever owned that car was smart as hell with that check valve in the pcv line. Must have listened to the Brain.
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Old 05-11-2014, 11:02 PM   #3
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No FMU. Lots of boost coming out of a stock td04L, 12psi usually.... I went against my better judgement and autocrossed it today without a wideband..... Ran great.

Think that mini headphone jack is a scanner port for the stock ecu?

The real brain melter is the boost controller going into nowhere land into the stock wiring harness... Is there any way people mod these stock ecus?
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Old 05-12-2014, 09:21 AM   #4
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I'm guessing there's no longer a MAF/VAF on this car, correct?
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Old 05-12-2014, 09:38 AM   #5
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No maf it appears to be effectively replaced by a map sensor.
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Old 05-12-2014, 09:39 AM   #6
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I'm going with "Split Second" for $400, Alex.
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Old 05-12-2014, 10:32 AM   #7
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Quote:
Originally Posted by Braineack View Post
stock injectors
stock 1.8L injectors. So a slight upgrade for your 1.6L.
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Old 05-12-2014, 10:33 AM   #8
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Quote:
Originally Posted by darkhorizon View Post
Think that mini headphone jack is a scanner port for the stock ecu?
no.

Quote:
The real brain melter is the boost controller going into nowhere land into the stock wiring harness...
How are you even sure you have a boost controller? or better yet: how were WE supposed to know?

Quote:
Is there any way people mod these stock ecus?
most people don't (read 99%), that's why they install silly piggybacks.



Dark, I really suggest you give us no more information, pictures, details to go on, yet continue to ask important questions and abuse the car...

Last edited by Braineack; 05-12-2014 at 10:45 AM.
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Old 05-12-2014, 10:41 AM   #9
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Originally Posted by concealer404 View Post
I'm going with "Split Second" for $400, Alex.
That's not what they looked like.

What I find interesting is that it plugs into the AFM; obviously taking a MAP reading and sending a fake signal back to the ECU.

But then it's still wired back all the way at the ECU...so why even have it connect to the AFM? seems odd; or maybe it was a way to activate the fuel pump since the AFM got removed.

But, I don't ever remember seeing any sort of device like this since 2006.

the split second, which was similar, looked like this:



but it was hardwired in only, no AFM connector.
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Old 05-12-2014, 10:45 AM   #10
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There are many different kinds of Split Seconds.


The other thing i've seen that's somewhat similar to this would be MAPecu or maybe an HKS VPC, but i don't think the VPC box looked like that, and there would be another control box with 6 or 7 ***** depending on generation.


That said, there WAS an application off the shelf for the 1.6 miata for the HKS unit, but i don't know Miatas well enough to tell if we're looking at a 1.6 car, and there was a PNP harness for that application, so i'm not sure why someone would have wired the car as shown in the even it's the HKS unit.
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Old 05-12-2014, 10:46 AM   #11
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no, I've "tuned" a vpc, wasn't like that. I dont remember anythign being on the AFM connector, just had a map sensor wired back to the **** box.
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Old 05-12-2014, 10:48 AM   #12
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I need to dig back through the "archives" i have... I believe there was an SDS that looked something like that as well.


OP, basically... rip it out and get a Megasquirt.
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Old 05-12-2014, 10:57 AM   #13
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yes, that.
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Old 05-12-2014, 11:00 AM   #14
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Ive built and tuned a few megasquirts... and have a 4g63 ms2/3.0 one on the shelf... I got my adapter harness parts saturday morning...

Quote:
Originally Posted by Braineack View Post
no.

How are you even sure you have a boost controller? or better yet: how were WE supposed to know?

most people don't (read 99%), that's why they install silly piggybacks.

Dark, I really suggest you give us no more information, pictures, details to go on, yet continue to ask important questions and abuse the car...
Woah dawg, I know im just some dumb noob here, but cut me some slack eh?

Autocross is hardly "beating on it" first off.. I make a few 2nd gear pulls a run.. oh well, I said I knew what i was getting into when I did it, and I didnt say I was proud of it.

In terms of "information", I am more than happy to provide more, I am just not sure what you guys would like to know?

I know it has a boost controller because it has an AEM mac valve sitting on the wastegate... and it makes 7psi on wastegate spring alone.

Last edited by curly; 05-12-2014 at 12:01 PM.
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Old 05-12-2014, 11:24 AM   #15
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Quote:
Originally Posted by darkhorizon View Post
Woah dawg, I know im just some dumb noob here, but cut me some slack eh?
Don't sweat it too much, you've activated the automatic hazing ritual here at MT.


It appears from the image of the box plugged into the airflow-sensor connector that removing four screws will gain access to take a few detailed photos of what's inside. Might be informative. I've heard stories about devices which perform this function, and in fact I came up with a scheme for doing it years ago with the Greddy EMU, but I've never actually seen, with my own eyes, a self-contained device to do it.

The 1/8" jack on the center console is also interesting. As Brainey very tersely noted, it's unlikely to be a "scan connector," as the early 1.6 ECUs didn't offer much in the way of external data connectivity. Of course, for all we know there might be some piggyback EEPROM sitting under the lid of that apparently stock ECU. I'd be extremely curious to know where, exactly, those wires go.
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Old 05-12-2014, 11:24 AM   #16
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That's sketch as hell.

Concealer, the AFM plug, intake manifold, tombstone, recessed letters on the valve cover, and barely legible "B6" on the ECU tell you that it's a 1.6.

I'm guessing the box is sending a standard fake signal to the ECU, or at least just the AIT. Could the box some how be closing the vacuum line to the FPR? I can't imagine a tiny thing like that reacting quickly enough. Although it's just a T fitting.

I'd be interested to see an AFR curve. But I'm guessing you'll get into boost and quickly get out of it if you actually had a wideband.
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Old 05-12-2014, 11:30 AM   #17
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Disassembly of the magic box did not go well during my first attempt. I would need to completely tear it apart as I see nothing but a metal plate after I pull off the cover.

The headphone jack runs into the factory harness... 2 wires tie in at the top left corner of the ecu if looking directly into the connector.

Boost controller wires tie in at a box (looks like an ignition box on a 2jz) on the pass side wheel well. 2 random cut wires that appear to go nowhere.... I can get colors later.
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Old 05-12-2014, 11:31 AM   #18
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it was my experience on larger injectors than those brown tops (305cc vs 265), that even at 100%DC, it was barely enough to maintain 13:1 to redline at around 7psi or 170rwhp.

what two wires on the harness do they go to? pin locations and/or color will do...
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Old 05-12-2014, 11:32 AM   #19
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You can see the headpbone jack wires in the ecu picture.... its the ball of electrical tape at the bottom left of the picture.
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Old 05-12-2014, 11:34 AM   #20
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I am sorry but I cant get some of the details on this until tonight.
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